AAON R90800 Technical Manual

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Full Digital Module

Technical Guide

Factory Packaged Controls

Tulsa

Table of Contents

OVERVIEW ........................................................................................................................................................ 3

INSTALLATION AND WIRING ........................................................................................................................... 4

Environmental Requirements .......................................................................................................................................................4
Mounting.......................................................................................................................................................................................4
Power Supply and Communications ............................................................................................................................................4
Important Wiring Considerations ..................................................................................................................................................5
VCM-X Modular E-BUS Controller to Full Digital Module Wiring .................................................................................................6

START-UP AND COMMISSIONING .................................................................................................................... 8

General.........................................................................................................................................................................................8
Unit Con

gurations .......................................................................................................................................................................8

MODES OF OPERATION ................................................................................................................................... 9

Digital Stage 1 / Digital Stage 2....................................................................................................................................................9
Off Mode .......................................................................................................................................................................................9
Cooling Mode ...............................................................................................................................................................................9
Heat Pump Heating Mode (Air to Air) ...........................................................................................................................................9
Dehumidi

cation Mode .................................................................................................................................................................9

Defrost Mode ................................................................................................................................................................................9
Staging Delays .............................................................................................................................................................................9

TROUBLESHOOTING ...................................................................................................................................... 10

Using LEDs to Verify Operation..................................................................................................................................................10
LED Diagnostics .........................................................................................................................................................................12
Suction Pressure Transducer Testing .........................................................................................................................................13

APPENDIX ...................................................................................................................................................... 14

VCM-X Controller to Full Digital Module Wiring .........................................................................................................................14

WattMaster Controls Inc.
8500 NW River Park Drive · Parkville , MO 64152
Toll Free Phone: 866-918-1100
PH: (816) 505-1100 · FAX: (816) 505-1101
E-mail: mail@wattmaster.com
Visit our web site at www.orioncontrols.com
WattMaster Form : AA-FDM-TGD-01G

is a registered trademark of AAON, Inc., Tulsa, OK.

Neither WattMaster Controls, Inc. nor AAON

assumes any responsibility for errors or omissions in this document.
This document is subject to change without notice.

www.aaon.com

PART NUMBER CROSS REFERENCE TABLE

PART DESCRIPTION

ORION

AAON

VCM-X Full Digital Module

OE370-23-FDM-A

R74870

VCM-X Modular Controller

OE332-23-VCMX-MOD-A

R90800

VCM-X Modular E-BUS Controller

OE332-23E-VCMX-MOD-A

V07150

VCM-X E-BUS Distribution Module

OE365-23-EBD-A

R82930

VCM-X Expansion Module

OE333-23-EM

R69190

VCM-X 12 Relay Expansion Module

OE358-23-12R

R69180

VCM-X One Condenser Head Pressure Module

OE370-23-HP1C

R74860

VCM-X Two Condenser Head Pressure Module

OE370-23-HP2C

R90230

Technical Guide

Full Digital Module

Overview

The Full Digital Module (OE370-23-FD-A) is a device that enables and
modulates up to four digital compressors on HVAC Units controlled
by the VCM-X Modular Controller (OE332-23-VCMX-MOD-A) or
VCM-X Modular E-BUS Controller (OE332-23E-VCMX-MOD-A).
The Full Digital Module will control the digital compressors to satisfy
the cooling, dehumidi

cation, and heat pump requirements of the VCM-

X Modular series controller.

If the Full Digital Module is in the Cooling Mode or Heat Pump Heat-
ing Mode, it will modulate the compressors to maintain the appropriate
Supply Air Temperature Setpoint. If the module is in the Dehumidi

ca-

tion Mode, it will modulate compressors to maintain the Coil Suction
Temperature Setpoint. If the module is in the Heat Pump Heating Mode,
the module can also monitor a signal for a Defrost Cycle from the VCM-
X Modular series controller if a One Condenser Head Pressure Module
(OE370-23-HP1C) is also installed.

Module Overview

Figure 1: Full Digital Module

The Full Digital Module is connected to the VCM-X Modular Control-
ler using the E-BUS Distribution Module (OE365-23-EBD). The Full
Digital Module can also be directly connected to the VCM-X Modular
E-BUS Controller. Either connection allows the Full Digital Module
to receive setpoints and monitor the Supply Air Temperature from the
VCM-X Modular series controller. The Full Digital Module requires a
24 VAC power connection with an appropriate VA rating.

NOTE:

The Full Digital Module contains no user-serviceable

parts. Contact qualified technical personnel if your
module is not operating correctly.

www.orioncontrols.com

1003

1002

10uF

300

1
2
4
8

SERIA

R11

R12

R13

R14

R23

R24

R25

R26

R28

R29

R30

SW1

D12

D13

R53

R54

TB3

C20

R34

SW2

+5V

SIG 2

GND

1003

1002

10uF

1003

1002

10uF

1003

1002

10uF

4751

OFF

ION
S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

300

GND

BIN 2

GND

1002

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

.01uF

PWR

Full Digital Module

Technical Guide

Environmental Requirements

The Full Digital Module needs to be installed in an environment which
can maintain a temperature range between -30°F and 150°F and not
exceed 90% RH levels (Non-Condensing).

Mounting

The Full Digital Module is housed in a plastic enclosure. It is designed
to be mounted by using the 3 mounting holes in the enclosure base. It is
important to mount the module in a location that is free from extreme high
or low temperatures, moisture, dust, and dirt. Be careful not to damage
the electronic components when mounting the module.

See Figure 2

for Module dimensions (dimensions are in inches).

Power Supply and Communications

The Full Digital Module is connected to the E-BUS Distribution Mod-
ule with a modular HSSC cable to provide communications from the
VCM-X Modular Controller. The E-BUS Distribution Module uses
WattMaster Control’s standard I

C modular cable to connect with the

VCM-X Modular Controller, VCM-X Expansion Module, or 12-Relay
Expansion Module.

The Full Digital Module can also be directly connected to the VCM-X
Modular E-BUS Controller, bypassing the use of the E-BUS Distribu-
tion Module.

The Full Digital Module requires a 24 VAC power supply with an ap-
propriate VA rating.

WARNING:

Observe polarity! All boards must be wired

GND-to-GND and 24 VAC-to-VAC. Failure to

observe polarity could result in damage to the

boards.

Installation and Wiring

5.04

5.64

5.71

2.07

0.55

4.14

0.29

0.18 DIA. TYP.

www.orioncontrols.com

1003

1002

10uF

300

1
2
4
8

SERIA

R11

R12

R13

R14

R23

R24

R25

R26

R28

R29

R30

SW1

D12

D13

R53

R54

TB3

C20

R34

SW2

+5V

SIG 2

GND

1003

1002

10uF

1003

1002

10uF

1003

1002

10uF

4751

OFF

ION
S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

300

GND

BIN 2

GND

1002

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

.01uF

PWR

Note:

Height is 1.49 inches.

Figure 2: Full Digital Module Dimensions

Technical Guide

Full Digital Module

Installation and Wiring

Important Wiring Considerations

Please carefully read and apply the following information when wiring
the Full Digital Module:

1. The 1 to 5 VDC signals for the Copeland Compressor

Speed need to use 18-gauge shielded twisted pair cable, and
the Drain wire must be the GND signal.

2. All 24 VAC wiring must be connected so that all ground

wires remain common. Failure to follow this procedure can
result in damage to the module and connected devices.

3. All wiring is to be in accordance with local and

national electrical codes and speci

cations.

4. Be sure that all wiring connections are properly inserted

and tightened into the terminal blocks. Do not allow wire
strands to stick out and touch adjoining terminals. This
could potentially cause a short circuit.

5. Be sure all modular wiring harness connectors are seated

rmly in their respective modular connectors on the circuit

board.

NOTE:

The Compressor Relays on the Full Digital Module

are used rather than the relay outputs on the VCM-X
Modular series controller.

WARNING:

Be sure all controllers and modules are

powered down before connecting or

disconnecting HSSC cables.

Figure 3: Full Digital E-BUS Connection Wiring

SHLD

OUT

COM

EXC

SHLD

OUT

COM

EXC

AO1

SIG 1

SIG 2

SIG 3

SIG 4

AO2

GND

+5V

SIG 2

GND

OPTI

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE370-23-FD-A

Full Digital Module

Copeland Digital

Compressor Controller B1

Copeland Digital

Compressor Controller A2

Copeland Digital

Compressor Controller A1

Copeland Digital

Compressor Controller B2

If Using One

Module, Set

Addresses To

Off. If Using

Two Modules,

Set Addresses
Consecutively.

This Dip

Switch Is Not

Used For This

Application

PWR

Connect To E-BUS

Distribution Module or

VCM-X Modular E-BUS Controller

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

HSSC Cable

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

GND

WARNING!!

Observe Polarity! All
boards must be wired
with GND-to-GND and
24 VAC-to-24 VAC.
Failure to observe
polarity could result in
damage to the boards.

HSSC Cable

NOTE:

NORMALLY OPEN AND

RATED FOR 24 VAC POWER

ALL RELAY OUTPUTS

ARE

COMPRESSOR A2 ENABLE

COMPRESSOR A1 ENABLE

COMPRESSOR B1 ENABLE
COMPRESSOR B2 ENABLE

ONLY.

1 AMP MAXIMUM LOAD.

HVAC UNIT CONNECTIONS

Full Digital Module

Technical Guide

Installation and Wiring

VCM-X Modular E-BUS Controller to

Full Digital Module Wiring

The Full Digital Module directly connects to the VCM-X Modular E-
BUS Controller using a modular HSSC cable. The Full Digital Module
requires a 24 VAC power connection with an appropriate VA rating. See

Figure 4

below for wiring.

Any E-BUS Module can be connected to the E-BUS Controller’s E-BUS
port or can be daisy-chained together using HSSC cables.

NOTE:

Contact Factory for the correct HSSC cable length for

your application. Cables are available in ½ and 3 meter
lengths and 100 and 150 foot lengths.

Figure 4: VCM-X Modular E-BUS Controller to Full Digital Module Wiring Diagram

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

HSSC Cable

Connect To VCM-X E-BUS Controller

OE370-23-FD-A

Full Digital Module

+5V

SIG 2

GND

OPTI

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

PWR

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

GND

WARNING!!

Observe Polarity! All boards must be
wired with GND-to-GND and 24 VAC-
to-24 VAC. Failure to observe polarity
could result in damage to the boards.

This Dip Switch Is

Not Used For This

Application

If Using One Module,

Set Addresses To Off.

If Using Two Modules,

Set Addresses
Consecutively.

Technical Guide

Full Digital Module

Installation and Wiring

WARNING:

Be sure all controllers and modules are

powered down before connecting or

disconnecting HSSC cables.

Figure 4, cont.: VCM-X E-BUS Controller to Full Digital Module Wiring Diagram

Line Voltage

All Comm Loop Wiring Is

Straight Thru

24VAC

GND

Local Loop

RS-485

9600 Baud

See Individual

Component Wiring

Diagrams For

Detailed Wiring Of
Analog Inputs And

For Stand Alone Applications,

Connect To System Manager. For Network

Applications Connect To Next Controller

And/Or MiniLink PD On Local Loop.

G - Fan ON/OFF Only

R - 24VAC

Relay Output Contacts
R2 Through R5 May Be User-Configured
For The Following:

1 - Heating Stages
2 - Cooling Stages
3 - Warm-up Mode Command (VAV Boxes)
4 - Reversing Valve (Air To Air Heat Pumps)
5 - Reheat Control (Dehumidification)
6 - Exhaust Fan Interlock
7 - Preheater For Low Ambient Protection
8 - Alarm
9 - Override
10 - Occupied
11 - OA Damper
12 - Heat Wheel
13 - Emergency Heat
Note: 1.) When Using the HP2C Module,
All Compressors Will Be Wired From the
Protection Module, Not the VCM-X Controller.
Note: A Total Of 20 Relays Are Available By
Adding Relay Expansion Modules. All
Expansion Module Relay Outputs Are User
Configurable As Listed Above.

Connect FRP Tubing To High Pressure
Port (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere

OE271

Static Pressure

Transducer

Splice If Required

Connect To
Expansion Module(s)
(When Used)

Connect To Digital Room Sensor And/Or
Digital CO Sensor

Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.

T to T, R to R & SHLD to SHLD

Size Transformer For Correct
Total Load.
VCM-X Modular Controller = 8

OE332-23E-VCMX-MOD-A

VCM-X Modular

E-BUS Controller

Note:

All Relay Outputs Are Normally Open And
Rated For 24 VAC Power Only.
1 Amp Maximum Load.

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

Jumpers

HSSC Cable Connect To

VCM-X E-BUS Port

RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC

RS-485 COMMUNICATION LOOP. WIRE
“R” TO “R”, “T” TO “T” “SHLD” TO “SHLD”

FAN

RELAY 2

RELAY 3

RELAY 4

RELAY 5

RELAY
COMMON

IC DIGITAL

SENSOR

EXPANSION

STATIC

PRESSURE

ANALOG INPUT JUMPER SETTINGS
MUST BE SET AS SHOWN FOR
PROPER OPERATION

24 VAC POWER ONLY

WARNING!

POLARITY MUST BE OBSERVED

OR THE CONTROLLER WILL BE DAMAGED

AI1

AI2

AI3

AI4

THERM

4-20mA

0-10V

0-5V

AI5

AI7

ANALOG INPUT

JUMPER

SETTINGS

WattMaster Label
#LB102073-01-A

Rev.: 1A

www.aaon.com

www.orioncontrols.com

VCM-X MODULAR E-BUS CONTROLLER

Orion No.:OE332-23E-VCMX-MOD-A

AAON No.:

V07150

AI1

= SPC (SPACE TEMPERATURE SENSOR)

AI2

AI3

AI4

AI5

AI7

A01

A02

= SAT (SUPPLY AIR TEMPERATURE SENSOR)
= RAT (RETURN AIR TEMPERATURE SENSOR)
= OAT (OUTDOOR AIR TEMPERATURE SENSOR)
= SUCTION PRESSURE SENSOR (FROM EXP. MODULE)
= SPACE TEMPERATURE SENSOR SLIDE ADJUST

OR VOLTAGE RESET SOURCE

= ECONOMIZER (2-10 VDC OUTPUT)
= SUPPLY FAN VFD (0-10 VDC OUTPUT)

LED BLINK CODES

LED NAME

STATUS1 STATUS2

NORMAL OPERATION

SAT FAIL

OAT FAIL

SPC FAIL

MODULE ALARM

MECH COOL FAIL

MECH HEAT FAIL

FAN PROOF FAIL

DIRTY FILTER

EMERGENCY SHUTDOWN

LOW SAT

HIGH SAT

CONT. TEMP COOL FAIL

CONT. TEMP HEAT FAIL

PUSH BUTTON OVR

ZONE OVR

OUTPUT FORCE ACTIVE

E-BUS

CONNECTOR

Full Digital Module

Technical Guide

Start Up and Commissioning

General

In order to have a trouble free start-up, it is important to follow a few
simple procedures. Before applying power for the

rst time, it is very

important to run through a few simple checks.

One of the most important checks to make before powering up the system
for the

rst time is to make sure that the VCM-X Modular or VCM-X

Modular E-BUS Controller is con

gured properly for your application.

Refer to the

VCM-X Controller Technical Guide

VCM-X Modular

E-BUS Controller Technical Guide

for more information. A handheld

Modular Service Tool, Modular System Manager, or System Manager
Touch Screen connected to the VCM-X Modular or VCM-X Modular
E-BUS Controller will allow you to con

gure your application. Refer to

the

VCM-X / RNE Operator’s Interfaces SD Technical Guide

System

Manager TS II Technical Guide

for more information.

Check all wiring leads at the terminal block for tightness. Be sure that
wire strands do not stick out and touch adjacent terminals. Con

that all sensors required for your system are mounted in the appropriate
location and wired into the correct terminals.

WARNING:

Observe polarity! All boards must be wired

GND-to-GND and 24 VAC-to-VAC. Failure to

observe polarity could result in damage to the

boards.

Table 1: Unit Con

gurations Chart

UNIT CONFIGURATIONS

PERMUTATION

SYSTEM A

SYSTEM B

HARDWARE

VCM-X WSHP

CONFIGURATION

Comp A1

Comp A2 Comp B1

Comp B2

Relay 1

Relay 2

Relay 3

Relay 4

On/Off

Use VCM-X Modular

Series Controller Only

2 Compressors

Digital

On/Off

Use VCM-X Modular

Series Controller Only

2 Compressors
Digital Compressor

Digital

Use VCM-X Modular

Series Controller and

Full Digital Module

2 Compressors
Full Digital

On/Off

Use VCM-X Modular

Series Controller Only

4 Compressors

Digital

On/Off

Not Available

Digital

On/Off

Digital

On/Off

Use VCM-X Modular

Series Controller Only

4 Compressors
Digital Compressor

Digital

Use VCM-X Modular

Series Controller and

Full Digital Module

4 Compressors
Full Digital

In the

Cooling Mode

, the Compressors will stage in the following order:

Permutations 1, 2 & 3:

Compressor A1 -> Compressor A2

Permutations 4:

Compressor A1 -> Compressor A2 -> Compressor B1 -> Compressor B2

Permutations 6:

Compressor A1 & Compressor A2 -> Compressor B1 -> Compressor B2

Permutations 7:

Compressor A1 & Compressor A2 -> Compressor B1 & Compressor B2

In the

Dehumidi

cation Mode

, the Compressors will stage in the following order:

Permutation 4:

Compressor A1 & Compressor A2 -> Compressor B1 -> Compressor B2

All other permutations in the Dehumidi

cation Mode stage as described in the Cooling Mode.

Technical Guide

Full Digital Module

Modes of Operation

NOTE:

See Unit Con

gurations Chart on page 10 for more

information about compressor staging.

Digital Stage 1 / Digital Stage 2

On units with two Digital Scroll Compressors, the

rst compressor (A1)

will be designated as Digital Stage 1 and the second compressor (A2)
will be designated as Digital Stage 2.

On units with four Digital Scroll Compressors, there may be instances
where compressor numbers on the module do not correlate with the
mechanical compressors’ numbers. Therefore, Digital Stage 1 refers to
the

rst set of Digital Scroll Compressors (A1/B1) that will stage on

together and Digital Stage 2 refers to the second set of Digital Scroll
Compressors (A2/B2) that will stage on together. Please refer to AAON’s
wiring diagram for speci

c wiring of the unit.

Off Mode

The Full Digital Module will be in the Off Mode when no signal is
being received from the VCM-X Modular series controller to run the
compressors.

Cooling Mode

When a Cool Signal is received, the Full Digital Module will go into
Cooling Mode. At this point, Compressor A1 (and B1*) will energize and
Digital Stage 1 Analog Output will modulate as necessary to maintain
the Supply Air Temperature at the Active Supply Air Setpoint that is
broadcast from the VCM-X Modular series controller.

When Digital Stage 1 reaches 100%, a stage up timer is started. If Digital
Stage 1 stays at 100% for the Stage Up timer, Compressor A2 (and B2*)
will energize and both Digital Stage 1 and Digital Stage 2 outputs will
go to 50% and begin to modulate together.

If both systems are energized and they go below 30% and the Supply Air
is below the Supply Air Setpoint by the Cooling Stage Window value,
the stage down timer is started. If the systems remain below 30% for
the duration of the stage down timer, Digital Stage 2 will deactivate and
Digital Stage 1 will go to 60%. Digital Stage 1 will stage down if it is
at 0% for the duration of the stage down timer.

* If con

gured for 4 modulating compressors.

Heat Pump Heating Mode (Air to Air)

Heating Mode works the same as Cooling Mode except the Reversing
Valve is switched and the sequence is opposite. Compressors modulate
up when below the Heating Supply Air Setpoint and modulate down
when above the setpoint.

Dehumidi

cation Mode

In Dehumidi

cation Mode, compressors will be controlled to maintain

the Suction Pressure Temperature Setpoint. Digital Stage 1—Com-
pressor A1 (and B1*) will modulate up to 100% before Digital Stage
2—Compressor A2 (and B2*) can be energized. When Digital Stage 2
is energized, Digital Stage 1 will be locked at 100%.

* If con

gured for 4 modulating compressors.

Defrost Mode

In Defrost Mode, if only Digital Stage 1 is energized, it will go to 100%
and the reversing valve will deactivate. If both Digital Stage 1 & Digital
Stage 2 are energized, they will both go to 100% and the reversing valve
will be deactivated. The duration for Defrost Mode is determined by the
VCM-X Modular series controller.

NOTE:

Defrost Mode is only available if a One Condenser or

Two Condenser Head Pressure Module is installed.

Staging Delays

Staging Delays minimum run times and minimum off times are sent
from the VCM-X Modular series controller.

Full Digital Module

Technical Guide

Using LEDs to Verify Operation

The Full Digital Module is equipped with LEDs that can be used to verify
operation and perform troubleshooting. There are LEDs for communi-
cation, operation modes, and diagnostic codes. The module has seven
LEDs—one used for power, one used for operation status, one used for
alarms, and four used for the compressor relays. See

Figure 5

for the

LED locations. The LEDs associated with these inputs and outputs al-
low you to see what is active without using a voltmeter. The LEDs and
their uses are as follows:



Status LEDs

“COMM”

- The COMM LED lights up to indicate Communications

between the module and the VCM-X Modular series controller. If Com-
munications are established, the COMM LED will blink.

“ALARM”

- This is the diagnostic blink code LED. It will light up

and blink out diagnostic codes. See

Table 2

for Diagnostic Blink Code

descriptions. The blink code descriptions are also located on the mod-
ule’s front cover.

No. of Blinks

Status

No Problems

Low Suction Pressure Compressor A1

Low Suction Pressure Compressor A2

Low Suction Pressure Compressor B1

Low Suction Pressure Compressor B2

Pressure Sensor A1 Not Detected

Pressure Sensor A2 Not Detected

Pressure Sensor B1 Not Detected

Pressure Sensor B2 Not Detected

No Communication

Table 2: ALARM LED Blink Codes

Troubleshooting

“STAT”

- This is the status blink code LED. It will light up and every 10

seconds will blink the status mode that the module is currently operating
under. See

Table 3

for Status Blink Code code descriptions. The blink

code descriptions are also located on the module’s front cover.

No. of Blinks

Status

Off Mode

Cool Mode

Heat Mode

Dehumidify Mode

Defrost Mode

Table 3: STAT LED Blink Codes

Technical Guide

Full Digital Module





Compressor LEDs

“R1”

- This LED will light up when Compressor A1 is enabled and will

stay lit as long as Compressor A1 is active.

“R2”

- This LED will light up when Compressor A2 is enabled and will

stay lit as long as Compressor A2 is active.

“R3”

- This LED will light up when Compressor B1 is enabled and will

stay lit as long as Compressor B1 is active.

“R4”

- This LED will light up when Compressor B2 is enabled and will

stay lit as long as Compressor B2 is active.

SERIA

R11

R12

R28

R29

R30

D12

D13

R53

R54

TB3

C20

R34

SW2

4751

OF
F

ION
S

ALARM

STAT

COMM

1002

RELAYS

ANALOG

AO1

AO2

GND

PWM1-

PWM1+

PWM2-

PWM2+

.01uF

Figure 5: LED Locations

Troubleshooting

Full Digital Module

Technical Guide

LED Diagnostics

“PWR” LED:

When the Full Digital Module is powered up, the PWR

LED (located below the address switches) should light up and stay on
continuously. If it does not light up, check to be sure that the power wir-
ing is connected to the board, the connections are tight, and the VCM-X
Modular series controller is powered. If after making all these checks,
the PWR LED does not light up, the module is probably defective.

“COMM” LED:

The COMM LED lights up to indicate Communica-

tions between the module and the VCM-X Modular series controller. If
the COMM LED does not blink, then communications have not been
established. Check the connection between the VCM-X Modular Con-
troller, the VCM-X Modular E-BUS Controller, the E-BUS Distribution
Module, and the Full Digital Module.

“STAT” LED:

As previously described, this LED will blink out the

operation mode that the Full Digital Module is operating under. When
the board is

rst powered up, the STAT LED will do the following:



Light up



Blink out status code every ten seconds to indicate

controller

status

“ALARM” LED:

As previously described, this LED will blink on and

off to indicate alarms and diagnostics.

Troubleshooting

Other Checks

NOTE:

The Full Digital Module contains no user-serviceable

parts. Contact qualified technical personnel if your
module is not operating correctly.

Technical Guide

Full Digital Module

Troubleshooting

OE275-01 Suction Pressure Transducer

Testing for R410A Refrigerant

The Evaporator Coil Temperature is calculated by converting the Suc-
tion Pressure to Temperature. The Suction Pressure is obtained by using
the OE275-01 Suction Pressure Transducer, which is connected into the
Suction Line of the Compressor.

Use the voltage column to check the Suction Pressure Transducer while
connected to the Full Digital Module. Read voltage with a meter set on
DC volts. If the temperature/voltage or pressure/voltage readings do
not align closely with the chart, your Suction Pressure Transducer is
probably defective and will need to be replaced.

See the OE275-01 Suction Pressure Transducer, Pressure, Temperature,
and Voltage Chart for R410A Refrigerant testing (

Table 4)

. The chart

shows a temperature range from 20°F to 80°F. For troubleshooting pur-
poses, the DC Voltage readings are also listed with their corresponding
temperatures and pressures.

Table 4: Coil Pressure/Voltage/Temp for OE275-01
Suction Pressure Transducers - R410A Refrigerant

OE275-01 Suction Pressure Transducer Coil Pressure

– Temperature – Voltage Chart for R410A Refrigerant

Temperature

°F

Pressure

PSI

Signal

DC V

olts

Temperature

°F

Pressure

PSI

Signal

DC V

olts

21.19

80.94

1.8

59.03

168.10

3.2

24.49

87.16

1.9

61.17

174.32

3.3

27.80

93.39

2.0

63.19

180.55

3.4

30.99

99.62

2.1

65.21

186.78

3.5

33.89

105.84

2.2

67.23

193.00

3.6

36.80

112.07

2.3

69.24

199.23

3.7

39.71

118.29

2.4

71.15

205.46

3.8

42.30

124.52

2.5

72.95

211.68

3.9

44.85

130.75

2.6

74.76

217.91

4.0

47.39

136.97

2.7

76.57

224.14

4.1

49.94

143.2

2.8

78.37

230.36

4.2

52.23

149.42

2.9

80.18

236.59

4.3

54.50

155.65

3.0

56.76

161.88

3.1

Full Digital Module

Technical Guide

Connect To

E-BUS

Distribution

Module

Line Voltage

24 VAC

GND

Line Voltage

All Comm Loop Wiring Is

Straight Thru

24VAC

GND

Local Loop

RS-485

9600 Baud

See Individual Component

Wiring Diagrams For

Detailed Wiring Of Analog

Inputs And Outputs

For Stand Alone Applications,
Connect To System Manager.

For Network Applications

Connect To Next Controller

And/Or MiniLink PD On Local Loop.

G - Fan ON/OFF Only

R - 24VAC

Relay Output Contacts
R2 Through R5 May Be User-Configured
For The Following:

1 - Heating Stages
2 - See Note 1 Below
3 - Warm-up Mode Command (VAV Boxes)
4 - Reversing Valve (Air To Air Heat Pumps)
5 - Reheat Control (Dehumidification)
6 - Exhaust Fan Interlock
7 - Preheater For Low Ambient Protection
8 - Alarm
9 - Override
10 - Occupied
11 - OA Damper
12 - Heat Wheel
13 - Emergency Heat
Note: 1.) When Using the HP2C Module,
All Compressors Will Be Wired From the
Protection Module, Not the VCM-X
Controller.
2.) A Total Of 20 Relays Are Available By
Adding Relay Expansion Modules. All
Expansion Module Relay Outputs Are User-
Configurable As Listed Above.

Connect FRP Tubing To High Pressure
Port (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere

OE271

Static Pressure

Transducer

Splice If Required

Connect To E-BUS Distribution Module
or Expansion Module(s) (When Used)

Connect To Digital Room Sensor And/Or
Digital CO Sensor

Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.

T to T, R to R & SHLD to SHLD

Size Transformer For
Correct Total Load.
VCM-X Modular Controller
= 8 VA

OE332-23-VCMX-MOD-A

VCM-X Modular Controller

Note:

All Relay Outputs Are Normally Open And Rated
For 24 VAC Power Only.
1 Amp Maximum Load.

AI1

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

AI2

AI3

AI4

AI5

AI7

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

Jumpers

Figure 6: VCM-X Modular Controller Connection to Full Digital Module

Appendix

VCM-X Modular Controller to Full

Digital Module Wiring

When using the VCM-X Modular Controller, the E-BUS Distribution
Module is required ot connect to the Full Digital Module. The Full Digital
Module connects to the E-BUS Distribution Module using a modular
HSSC cable. The Full Digital Module requires a 24 VAC power con-
nection with an appropriate VA rating.

The E-BUS Distribution Module connects to the VCM-X Modular
Controller, VCM-X Expansion Module, or 12 Relay Expansion Module
using the I

C port. See

Figure 6

below for wiring.

Any E-BUS module can be connected to each of the four E-BUS

Dis-

tribution Module’s output ports or can be daisy-chained together using
HSSC cables.

If using a spliced terminal connection for longer runs, one module can be
connected to the E-BUS Distribution Module and any additional modules
would be daisy-chained to the

rst module. For more information, refer

to the

E-BUS Distribution Module Technical Guide.

Technical Guide

Full Digital Module

Appendix

NOTE:

Contact Factory for the correct HSSC cable length for

your application. Cables are available in ½ and 3 meter
lengths and 100 and 150 foot lengths.

WARNING:

Be sure all controllers and modules are

powered down before connecting or

disconnecting HSSC cables.

Figure 6: VCM-X Modular Controller Connection to Full Digital Module

WARNING!!

Observe Polarity! All
boards must be wired with
GND-to-GND and 24 VAC-
to-24 VAC. Failure to
observe polarity could
result in damage to the
boards.

OE365-23-EBD E-BUS

Distribution Module

GND

-COMM

SHLD

+COMM

INPUT

+COMM

SHLD

-COMM

GND

+VDC

485 DRV

24VAC

GND

PWR

YS102308
REV 1
I2C TO COMM
DIST. BOARD

OUTPUT

Modular Cable

Connect To

VCM-X Modular Controller

HSSC Cable

Connect To E-BUS

Distribution Module

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

OE370-23-FD-A

Full Digital Module

+5V

SIG 2

GND

OPTI

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

PWR

HSSC Cable

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

GND

WARNING!!

Observe Polarity! All boards must
be wired with GND-to-GND and 24
VAC-to-24 VAC. Failure to observe
polarity could result in damage to
the boards.

If Using One

Module, Set

Addresses To

Off. If Using

Two Modules,

Set Addresses
Consecutively.

This Dip

Switch Is Not

Used For This

Application

2425 So. Yukon Ave • Tulsa, OK 74107-2728

Ph: (918) 583-2266 • Fax: (918) 583-6094

AAON

Manual Part No. R84500

WattMaster Manual Form No: AA-FDM-TGD-01G

www.aaon.com

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