Coil Products
Factory Packaged Controls
Dual 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-S Modular Controller to Dual Digital Module Wiring ............................................................................................................6
VCM-X Modular E-BUS Controller to Dual Digital Module Wiring ................................................................................................8
START-UP AND COMMISSIONING .................................................................................................................. 10
General.......................................................................................................................................................................................10
Unit Confi gurations .....................................................................................................................................................................10
SEQUENCE OF OPERATION ........................................................................................................................... 11
Off Mode .....................................................................................................................................................................................11
Cooling Mode .............................................................................................................................................................................11
Dehumidifi cation Mode ...............................................................................................................................................................11
Heat Pump Heating Mode (Air to Air) .........................................................................................................................................11
Defrost Mode ..............................................................................................................................................................................11
Staging Delays ...........................................................................................................................................................................11
TROUBLESHOOTING ...................................................................................................................................... 12
Using LEDs to Verify Operation..................................................................................................................................................12
LED Diagnostics .........................................................................................................................................................................13
Other Checks .............................................................................................................................................................................13
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION ORION
VCM-X Dual Digital Module OE370-23-DD-C 30311
VCM-X Modular Controller OE332-23-VCMX-MOD-C 30553
VCM-X Modular E-BUS Controller OE332-23E-VCMX-C TBA
VCM-X E-BUS Distribution Module OE365-23-EBD-C 30312
VCM-X Expansion Module OE333-23-EM 30308
VCM-X 12 Relay Expansion Module OE358-23-12R 30309
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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-DDM-TGD-01F
Copyright December 2013 WattMaster Controls, Inc.
AAON
COIL
®
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.
®
Dual Digital Module
Module Overview
Overview
The Dual Digital Module (OE370-23-DD-C) is a device that enables and
modulates two digital compressors on HVAC Units controlled by the
VCM-X Modular Controller (OE332-23-VCMX-MOD-C) or VCM-X
Modular E-BUS Controller (OE332-23E-VCMX-MOD-C). The Dual
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 Dual 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 T wo Condenser Head Pressure Module
(OE370-23-HP2C) is also installed.
The Dual Digital Module must be used in conjunction with the VCMX Modular Controller. The Dual Digital Module is connected to the
VCM-X Modular Controller using the E-BUS Distribution Module
(OE365-23-EBD). The Dual Digital Module can also be directly connected to the the VCM-X Modular E-BUS Controller. Either connection
allows the Dual Digital Module to receive setpoints and monitor the
Supply Air Temperature from the VCM-X Modular series controller.
The Dual Digital Module requires a 24 VAC power connection with an
appropriate VA rating.
NOTE: The Dual Digital Module contains no user-serviceable
parts. Contact qualifi ed technical personnel if your mod-
ule is not operating correctly.
Figure 1: Dual Digital Module
Technical Guide 3
Dual Digital Module
Installation and Wiring
Environmental Requirements
The Dual 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 Dual 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 Dual 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 I
VCM-X Modular Controller, VCM-X Expansion Module, or 12-Relay
Expansion Module.
The Dual 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 Dual Digital Module requires a 24 VAC power connection 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.
2
C modular cable to connect with the
Figure 2: Dual Digital Module Dimensions
4
Technical Guide
Dual Digital Module
Installation and Wiring
Important Wiring Considerations
Please carefully read and apply the following information when wiring
the Dual 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.
OE370-23-DD-C
Dual Digital Module
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 Dual 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: NORMALLY
ALL RELAY OUTPUTS ARE
OPEN AND RATED FOR 24 VAC POWER ONLY
- 1 AMP MAXIMUM LOAD
PWR
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
SIG 1
GND
SIG 3
GND
This Dip
Switch Is Not
Used For This
Application
HSSC Cable
Connect To
E-BUS Distribution Module or
VCM-X Modular E-BUS Controller
RELAYCONTACT RATING
IS 1 AMP MAX @ 24 VAC
COMP. #1 ENABLE
COMP. #2 ENABLE
NOT USED
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OE370-23-FD FULL DIGITALCOMPRESSOR MODULE
COMPRESSOR #1
+5V
NOT USED
SIG 1
COPELAND CNTRLR P6
GND
COPELAND CNTRLR P5
COMPRESSOR #2
+5V
NOT USED
SIG 2
COPELAND CNTRLR P6
GND
COPELAND CNTRLR P5
+5V
SIG 3
NOT USED
GND
+5V
SIG 4
NOT USED
GND
BIN 1
BIN 2
NOT USED
COM
E-BUS
WattMaster Label
#LB102056
Connector
RELAYCOMMON
COMP. #1 & #2 CNTRLR C1
E-BUS
Connector
NOT USED
COMP. #1 CNTRLR C2
COMP. #2 CNTRLR C2
HSSC Cable
GND
RELAYS
ANALOG
OPTIONS
ALARM
STAT
COMM
R1
R2
R3
R4
COMM
A1O
A2O
GND
This Dip
Switch Is
Not Used
For This
Application
COMPRESSOR A1 ENABLE
COMPRESSOR A2 ENABLE
COMPRESSOR B1 ENABLE
COMPRESSOR B2 ENABLE
HVAC UNIT CONNECTIONS
P5
P6
C1
C2
Copeland Digital
Compressor Controller A1
P5
P6
C1
C2
Copeland Digital
Compressor Controller B1
SHLD
EXC
OUT
COM
SHLD
EXC
OUT
COM
P4
P3
P2
P1
P4
P3
P2
P1
OE275-01 Suction
Pressure Transducer
RD
WH
BK
OE275-01 Suction
Pressure Transducer
RD
WH
BK
R1
R2
R3
R4
RC
AO1
AO2
GND
GND
R1
R2
R3
R4
Rc
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24VAC
24 VAC
Line Voltage
WARNING!!
24 VAC Transformer
3 VA Minimum
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
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.
Figure 3: Dual Digital E-BUS Connection Wiring
Technical Guide
5