Tulsa
Factory Packaged Controls
Full Digital Module
Technical Guide
Table of Contents
OVERVIEW ........................................................................................................................................................ 3
Overview ......................................................................................................................................................................................3
INSTALLATION AND WIRING ........................................................................................................................... 4
Environmental Requirements .......................................................................................................................................................4
Mounting.......................................................................................................................................................................................4
Power Supply and Communications ............................................................................................................................................4
Important Wiring Considerations ..................................................................................................................................................5
VCM-X Modular Controller to Full Digital Module Wiring .............................................................................................................6
VCM-X Modular E-BUS Controller to Full Digital Module Wiring .................................................................................................8
START-UP AND COMMISSIONING .................................................................................................................. 10
General.......................................................................................................................................................................................10
Unit Confi gurations .....................................................................................................................................................................10
MODES OF OPERATION ................................................................................................................................. 11
Digital Stage 1 / Digital Stage 2..................................................................................................................................................11
Off Mode .....................................................................................................................................................................................11
Cooling Mode .............................................................................................................................................................................11
Heat Pump Heating Mode (Air to Air) .........................................................................................................................................11
Dehumidifi cation Mode ...............................................................................................................................................................11
Defrost Mode ..............................................................................................................................................................................11
Staging Delays ...........................................................................................................................................................................11
TROUBLESHOOTING ...................................................................................................................................... 12
Using LEDs to Verify Operation..................................................................................................................................................12
LED Diagnostics .........................................................................................................................................................................13
Suction Pressure Transducer Testing .........................................................................................................................................14
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
www.aaon.com
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-01F
Copyright December 2013 WattMaster Controls, Inc.
AAON Manual Part Number: R84500
®
AAON
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.
®
Full Digital Module
Module Overview
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, dehumidifi 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 Heating Mode, it will modulate the compressors to maintain the appropriate
Supply Air Temperature Setpoint. If the module is in the Dehumidifi 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 VCMX Modular series controller if a One Condenser Head Pressure Module
(OE370-23-HP1C) is also installed.
The Full Digital Module is connected to the VCM-X Modular Controller 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.
Figure 1: Full Digital Module
Technical Guide 3
Full Digital Module
Installation and Wiring
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 Module with a modular HSSC cable to provide communications from the
VCM-X Modular Controller. The E-BUS Distribution Module uses
WattMaster Control’s standard I2C 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 Distribution Module.
The Full Digital Module requires a 24 VAC power supply with an appropriate 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.
Figure 2: Full Digital Module Dimensions
4
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 specifi cations.
SHLD
P5
P6
C1
C2
Copeland Digital
Compressor Controller A1
P5
P6
C1
C2
Copeland Digital
Compressor Controller A2
P5
P6
C1
C2
Copeland Digital
Compressor Controller B1
P5
P6
C1
C2
Copeland Digital
Compressor Controller B2
P4
EXC
OUT
COM
SHLD
EXC
OUT
COM
SHLD
EXC
OUT
COM
SHLD
EXC
OUT
COM
P4
P3
P2
P4
P3
P2
P4
P3
P2
RD
P3
WH
P2
BK
P1
RD
WH
BK
P1
RD
WH
BK
P1
RD
WH
BK
P1
Connect To E-BUS
Distribution Module or
VCM-X Modular E-BUS Controller
OE275-01 Suction
Pressure Transducer
OE275-01 Suction
Pressure Transducer
OE275-01 Suction
Pressure Transducer
OE275-01 Suction
Pressure Transducer
SIG 1
GND
SIG 2
GND
SIG 3
GND
SIG 4
GND
This Dip
Switch Is Not
Used For This
Application
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
ADDRESS
PWR
HSSC Cable
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
fi 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.
NOTE:
OE370-23-FD-A
Full Digital Module
GND
R1
R1
R2
R2
R3
R3
R4
R4
Rc
RELAYS
ANALOG
AO1
AO2
OPTIONS
ALARM
STAT
COMM
Switch Is Not
Used For This
Application
This Dip
PWM1-
PWM1+
PWM2-
PWM2+
AO1
AO2
GND
24 VAC
ALL RELAY OUTPUTS
NORMALLY OPENAND
ARE
RATED FOR 24 VAC POWER
ONLY. 1 AMP MAXIMUM LOAD.
COMPRESSOR A1 ENABLE
COMPRESSOR A2 ENABLE
COMPRESSOR B1 ENABLE
COMPRESSOR B2 ENABLE
HVAC UNIT CONNECTIONS
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.
Line Voltage
Figure 3: Full Digital E-BUS Connection Wiring
Technical Guide
HSSC Cable
24 VAC Transformer
3 VA Minimum
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
5
Full Digital Module
Installation and Wiring
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 connection 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 I2C port. See Figure 4 below for wiring.
For Stand Alone Applications,
Connect To System Manager.
For Network Applications
Connect To Next Controller
And/Or MiniLink PD On Local Loop.
Local Loop
RS-485
9600 Baud
All Comm Loop Wiring Is
Straight Thru
T to T, R to R & SHLD to SHLD
See Individual Component
Wiring Diagrams For
Detailed Wiring Of Analog
Inputs And Outputs
AI1 SET AI2 SET AI3 SET
AI1
AI2
AI3
AI4
AI5
AI7
OE332-23-VCMX-MOD-A
VCM-X Modular Controller
AI1 SET AI2 SET AI3 SET
AI4 SET AI5 SET AI7 SET
Any E-BUS module can be connected to each of the four E-BUS Distribution 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 fi rst module. For more information, refer
to the E-BUS Distribution Module Technical Guide.
NOTE: Contact Factory for the correct HSSC cable length for
your application. Cables are available in ¼, ½, 1, 2, 3,
4, and 5 Meter lengths and 100 and 150 Foot lengths.
Note:
All Relay Outputs Are Normally Open And Rated
For 24 VAC Power Only.
1 Amp Maximum Load.
R - 24VAC
G - Fan ON/OFF Only
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 UserConfigurable As Listed Above.
24 VAC
AI4 SET AI5 SET AI7 SET
Jumpers
Splice If Required
OE271
Static Pressure
Transducer
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
Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.
Connect To E-BUS Distribution Module
or Expansion Module(s) (When Used)
Figure 4: VCM-X Modular Controller Connection to Full Digital Module
6
GND
Line Voltage
24VAC
Size Transformer For
Correct Total Load.
VCM-X Modular Controller
= 8 VA
Connect To Digital Room Sensor And/Or
Digital CO Sensor
2
Technical Guide
Connect To
E-BUS
Distribution
Module
GND
Line Voltage
WARNING: Be sure all controllers and modules are
powered down before connecting or
disconnecting HSSC cables.
Full Digital Module
Installation and Wiring
OE365-23-EBD E-BUS
Distribution Module
YS102308
REV 1
I2CTO COMM
DIST. BOARD
OUTPUT
+COMM
SHLD
-COMM
GND
+VDC
INPUT
+COMM
SHLD
-COMM
GND
24VAC
GND
PWR
WARNING!!
Observe Polarity! All
boards must be wired with
GND-to-GND and 24 VACto-24 VAC. Failure to
observe polarity could
result in damage to the
boards.
485 DRV
Modular Cable
Connect To
VCM-X Modular Controller
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
ADDRESS
PWR
HSSC Cable
Connect To E-BUS
Distribution Module
OE370-23-FD-A
Full Digital Module
HSSC Cable
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
GND
24 VAC
R1
R2
R3
R4
Rc
RELAYS
ANALOG
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
OPTIONS
ALARM
STAT
COMM
24 VAC Transformer
3 VAMinimum
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.
Line Voltage
Figure 4: VCM-X Modular Controller Connection to Full Digital Module
Technical Guide
7
Full Digital Module
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 EBUS Controller using a modular HSSC cable. The Full Digital Module
requires a 24 VAC power connection with an appropriate V A rating. See
Figure 5 below for wiring.
OE370-23-FD-A
Full Digital Module
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
ADDRESS
PWR
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 ¼, ½, 1, 2, 3,
4, and 5 Meter lengths and 100 and 150 Foot lengths.
R1
R2
R3
R4
Rc
RELAYS
ANALOG
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
OPTIONS
WARNING!!
ALARM
Observe Polarity! All boards must be
STAT
COMM
wired with GND-to-GND and 24 VACto-24 VAC. Failure to observe polarity
could result in damage to the boards.
GND
24 VAC
24 VAC Transformer
3 VA Minimum
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
HSSC Cable
Connect To VCM-X E-BUS Controller
HSSC Cable
Figure 5: VCM-X Modular E-BUS Controller to Full Digital Module Wiring Diagram
8
Line Voltage
Technical Guide
WARNING: Be sure all controllers and modules are
powered down before connecting or
disconnecting HSSC cables.
For Stand Alone Applications,
Connect To System Manager. For Network
Applications Connect To Next Controller
And/Or MiniLink PD On Local Loop.
OE332-23E-VCMX-MOD-A
Local Loop
RS-485
9600 Baud
VCM-X Modular
E-BUS Controller
Full Digital Module
Installation and Wiring
Note:
All Relay Outputs Are Normally Open And
Rated For 24 VAC Power Only.
1 Amp Maximum Load.
All Comm Loop Wiring Is
Straight Thru
T to T, R to R & SHLD to SHLD
HSSC Cable Connect To
VCM-X E-BUS Port
See Individual
AI1 SET AI2 SET AI3 SET
AI4 SET AI5 SET AI7 SET
Component Wiring
Diagrams For
Detailed Wiring Of
Analog Inputs And
Jumpers
Splice If Required
OE271
Static Pressure
Transducer
RS-485 COMMUNICATION LOOP. WIRE
“R” TO “R”, “T” TO“T” “SHLD” TO “SHLD”
www.aaon.com
www.orioncontrols.com
VCM-X MODULAR E-BUS CONTROLLER
Orion No.:OE332-23E-VCMX-MOD-A
AI1 = SPC (SPACETEMPERATURE SENSOR)
AI2
= SAT(SUPPLY AIR TEMPERATURE SENSOR)
AI3
= RAT(RETURN AIR TEMPERATURE SENSOR)
AI4
= OAT(OUTDOOR AIR TEMPERATURE SENSOR)
AI5
= SUCTION PRESSURE SENSOR (FROM EXP. MODULE)
AI7
= SPACETEMPERATURE SENSOR SLIDE ADJUST
OR VOLTAGE RESETSOURCE
A01
= ECONOMIZER (2-10 VDC OUTPUT)
= SUPPLYFAN VFD (0-10 VDC OUTPUT)
A02
E-BUS
CONNECTOR
ANALOG INPUT
JUMPER
SETTINGS
THERM
4-20mA
AI1
0-10V
0-5V
THERM
4-20mA
AI2
0-10V
0-5V
THERM
4-20mA
AI3
0-10V
0-5V
THERM
4-20mA
AI4
0-10V
0-5V
THERM
4-20mA
AI5
0-10V
0-5V
THERM
4-20mA
AI7
0-10V
0-5V
ANALOG INPUT JUMPER SETTINGS
MUST BE SETAS SHOWN FOR
PROPER OPERATION
WattMasterLabel
STATIC
#LB102073-01-A
PRESSURE
LED BLINK CODES
LED NAME STATUS1 STATUS2
NORMALOPERATION 0 1
SAT FAIL 1 2
OAT FAIL 2 2
SPC FAIL 3 2
MODULE ALARM 4 2
MECH COOL FAIL 1 3
MECHHEAT FAIL 2 3
FAN PROOFFA IL 3 3
DIRTY FILTER 4 3
EMERGENCY SHUTDOWN 5 3
LOW SAT 1 4
HIGH SAT 2 4
CONT. TEMPCOOL FAIL 3 4
CONT. TEMP HEAT FAIL 4 4
PUSH BUTTON OVR 1 5
ZONE OVR 2 5
OUTPUT FORCEACTIVE 0 6
WARNING!POLARITY MUST BE OBSERVED
OR THE CONTROLLER WILL BE DAMAGED
2
IC
EXPANSION
Rev.: 1A
RELAYCONTACT
RATING IS 1AMP
MAX @ 24 VAC
RELAY
COMMON
FAN
RELAY2
RELAY3
RELAY4
RELAY5
AAON No.:
V07150
24 VAC POWER ONLY
2
IC DIGITAL
SENSOR
Connect To
Expansion Module(s)
(When Used)
R - 24VAC
G - Fan ON/OFF Only
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.
GND
Line Voltage
24VAC
Size Transformer For Correct
Total Load.
VCM-X Modular Controller = 8
Connect To Digital Room Sensor And/Or
Digital CO Sensor
2
Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.
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
Figure 5, cont.: VCM-X E-BUS Controller to Full Digital Module Wiring Diagram
Technical Guide
9
Full Digital Module
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 fi 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 fi rst time is to make sure that the VCM-X Modular or VCM-X
Modular E-BUS Controller is confi gured properly for your application.
Refer to the VCM-X Controller Technical Guide or 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 confi gure your application. Refer to
the VCM-X Operator’s Interfaces Technical Guide or System Manager
TS Technical Guide for more information.
UNIT CONFIGURATIONS
SYSTEM A SYSTEM B
PERMUTATION
1 On/Off On/Off
2 Digital On/Off
3 Digital Digital
4 On/Off On/Off On/Off On/Off
5 Digital On/Off On/Off On/Off Not Available Not Available
6 Digital On/Off Digital On/Off
7 Digital Digital Digital Digital
Comp A1 Comp A2 Comp B1 Comp B2
Relay 1 Relay 2 Relay 3 Relay 4
Check all wiring leads at the terminal block for tightness. Be sure that
wire strands do not stick out and touch adjacent terminals. Confi rm
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.
HARDWARE
Use VCM-X Modular
Series Controller Only
Use VCM-X Modular
Series Controller Only
Use VCM-X Modular
Series Controller and
Full Digital Module
Use VCM-X Modular
Series Controller Only
Use VCM-X Modular
Series Controller Only
Use VCM-X Modular
Series Controller and
Full Digital Module
VCM-X WSHP
CONFIGURATION
2 Compressors
2 Compressors
Digital Compressor
2 Compressors
Full Digital
4 Compressors
4 Compressors
Digital Compressor
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 B1 -> Compressor A2 -> Compressor B2
Permutations 6: Compressor A1 & Compressor B1 -> Compressor A2 -> Compressor B2
Permutations 7: Compressor A1 & Compressor B1 -> Compressor A2 & Compressor B2
In the Dehumidifi cation Mode, the Compressors will stage in the following order:
Permutation 4: Compressor A1 & Compressor B1 -> Compressor A2 -> Compressor B2
All other permutations in the Dehumidifi cation Mode stage as described in the Cooling Mode.
Table 1: Unit Confi gurations Chart
10
Technical Guide
Full Digital Module
Modes of Operation
NOTE: See Unit Confi 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 fi 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 fi 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 specifi 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.
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.
Dehumidifi cation Mode
In Dehumidifi cation Mode, compressors will be controlled to maintain
the Suction Pressure Temperature Setpoint. Digital Stage 1—Compressor 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 confi 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.
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 confi gured for 4 modulating compressors.
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.
Technical Guide
Revised: 12/16/13
11
Full Digital Module
Troubleshooting
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 communication, 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 6 for the
LED locations. The LEDs associated with these inputs and outputs allow 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 Communications 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 module’s front cover.
No. of Blinks Status
0 No Problems
1 Low Suction Pressure Compressor A1
2 Low Suction Pressure Compressor A2
3 Low Suction Pressure Compressor B1
4 Low Suction Pressure Compressor B2
5 Pressure Sensor A1 Not Detected
6 Pressure Sensor A2 Not Detected
7 Pressure Sensor B1 Not Detected
8 Pressure Sensor B2 Not Detected
9 No Communication
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.
Table 2: ALARM LED Blink Codes
“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
1 Off Mode
2 Cool Mode
3 Heat Mode
4 Dehumidify Mode
5 Defrost Mode
Table 3: STAT LED Blink Codes
12
Figure 6: LED Locations
Technical Guide
Full Digital Module
Troubleshooting
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 Communications 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 Controller, 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 fi 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.
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
13
Full Digital Module
Troubleshooting
OE275-01 Suction Pressure Transducer
T esting for R410A Refrigerant
The Evaporator Coil Temperature is calculated by converting the Suction Pressure to T emperature. 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, T emperature,
and Voltage Chart for R410A Refrigerant testing (Table 4). The chart
shows a temperature range from 20°F to 80°F . For troubleshooting purposes, the DC Voltage readings are also listed with their corresponding
temperatures and pressures.
OE275-01 Suction Pressure Transducer Coil Pressure
– Temperature – Voltage Chart for R410A Refrigerant
°F
Temperature
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
PSI
Pressure
Signal
DC Volts
°F
Temperature
PSI
Pressure
Signal
DC Volts
Table 4: Coil Pressure/Voltage/Temp for OE275-01
Suction Pressure Transducers - R410A Refrigerant
14
Technical Guide
Full Digital Module
Notes
Technical Guide
15
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AAON® Manual Part No. R84500
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