Orion One Condenser Head Pressure User Manual
Factory Packaged Controls
LED BLINK CODES
LED NAME STAT
BLINKS QTY. OF SENSORS INSTALLED
LED NAME
ALARM
NO PROBLEMS 0
NO SENSORS DETECTED 1
HIGH HEAD PRESSURE DETECTED 2
LOW HEAD PRESSURE DETECTED 3
One Condenser
Head Pressure Module
Technical Guide
RATING IS 1 AMP
RELAY CONTACT
E-BUS
Connector
REV. VLV. ENABLE
MAX @ 24 VAC
RELAY COMMON
1COrion No.:OE370-23-HP
www.aaon.com
One Condenser Head Pressure Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1/
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
A3
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
A4
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. ENABLE INPUT
BIN 1
REV. VLV. INPUT ENABLE
BIN 2
BIN 3
NOT USED
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102057-A
Rev.: 1J
COND. ENABLE
NOT USED
NOT USED
AAON No.:
COND. SIGNAL
NOT USED
GND
COND. FAN
COND. FAN
NOT USED
NOT USED
R74860
AO1
AO2
GND
PWM1PWM1+
PWM2PWM2+
GND
R1
R2
R3
R4
RC
+24 VAC
One Condenser Head Pressure Module
Table of Contents
OVERVIEW ........................................................................................................................................................ 3
Overview ......................................................................................................................................................................................3
Features .......................................................................................................................................................................................3
INSTALLATION AND WIRING ........................................................................................................................... 4
Environmental Requirements ....................................................................................................................................................... 4
Mounting.......................................................................................................................................................................................4
Power Supply ...............................................................................................................................................................................5
Important Wiring Considerations .................................................................................................................................................. 5
E-BUS Distribution Module to One Condenser Head Pressure Module Wiring ...........................................................................6
E-BUS Controller to One Condenser Head Pressure Module Wiring ..........................................................................................8
Stand-Alone Wiring ....................................................................................................................................................................10
Condenser Type Selection .........................................................................................................................................................10
SEQUENCE OF OPERATION ........................................................................................................................... 11
Inputs and Outputs ..................................................................................................................................................................... 11
Stand-Alone Input Commands ..................................................................................................................................................11
Input Commands (VCM-X Connection) ......................................................................................................................................12
Modes of Operation ....................................................................................................................................................................12
OPTIONS and ADDRESS Dipswitch Settings............................................................................................................................13
TROUBLESHOOTING ...................................................................................................................................... 15
Head Pressure Module Valve/Fan Position Troubleshooting .....................................................................................................15
Troubleshooting for Stand Alone Mode ......................................................................................................................................16
Pressure Transducer Troubleshooting ......................................................................................................................................17
Using LEDs to Verify Operation..................................................................................................................................................18
LED Diagnostics .........................................................................................................................................................................19
Other Checks .............................................................................................................................................................................19
APPENDIX FOR VERSION 1.06 AND EARLIER ............................................................................................... 20
VCM-X Connection Wiring .........................................................................................................................................................20
Stand-Alone Wiring ....................................................................................................................................................................21
Condenser Type Selection .........................................................................................................................................................22
Refrigerant Selection ..................................................................................................................................................................23
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION ORION
AAON
TULSA
AAON
COIL
One Condenser Head Pressure Module - Tulsa OE370-23-HP1C R74860 N/A
One Condenser Head Pressure Module - Coil OE370-23-HP1C-C N/A 30648
E-BUS Distribution Module OE365-23-EBD R82930 30312
VCM-X Modular E-BUS Controller OE332-23E-VCMX-MOD V07150 31422
VCM-X Modular Controller OE332-23-VCMX-MOD R90800 30553
VCM-X WSHP E-BUS Controller OE332-23E-VCMX-WSHP V07140 31423
VCM-X WSHP Controller OE332-23-VCMX-WSHP R90810 30526
www.aaon.com
2
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
Copyright August 2012 WattMaster Controls, Inc.
AAON Manual Part Number: R84490
®
AAON
is a registered trademark of AAON, Inc., Tulsa, OK.
WattMaster Form: AA-HP1C-TGD-01L
Neither WattMaster Controls, Inc. nor AAON
assumes any responsibility for errors or omissions in this document.
This document is subject to change without notice.
®
Technical Guide
One Condenser Head Pressure Module
Module Overview
Overview
NOTE: Software version 1.06 and earlier contain a few
differences from version 1.07 and later. For version
1.06 and earlier details, please see the Appendix.
The version number can be found on the upper right
of your module.
The One Condenser Head Pressure Module (OE370-23-HP1C) monitors
four individual head pressure transducers and controls the Condenser
Fan or Water Valve based on the highest of the four readings. If this is
a heat pump unit, the module is able to detect when the unit is in Heat
Pump Heating mode and will force the condenser signal to 100% until
it leaves this mode.
The One Condenser Head Pressure Module is designed to work standalone by using its OPTIONS Dip Switch to adjust the Head Pressure
setpoint.
Up to (2) One Condenser Head Pressure Modules can be daisy-chained
together and connected to the VCM-X Modular Controller or VCM-X
WSHP Controller using the E-BUS Distribution Module allowing the
One Condenser Head Pressure Module to receive setpoints from the
Controller. Up to (2) modules can also be daisy-chained together and
directly connected to the VCM-X Modular E-BUS or VCM-X WSHP
E-BUS Controller. See chart on page 2 for part numbers.
The One Condenser Head Pressure Module also provides a pulse width
modulation (PWM) signal or voltage output signal to control the condenser fan.
The One Condenser Head Pressure Module requires a 24 VAC power
connection with an appropriate VA rating.
Features
The One Condenser Head Pressure Module provides the following:
Can be operated stand alone or (2) can be daisy-chained
together and connected to a VCM-X Modular or VCM-X
WSHP Controller using the E-BUS Distribution Module to
E-BUS interface
Two modules can be daisy-chained together and be directly
connected to a VCM-X Modular E-BUS or VCM-X WSHP
E-BUS Controller
Monitors up to four individual head pressure transducers
Provides control of Condenser Output Signal based on the
highest reading of head pressure transducers
Capable of monitoring a Reverse Valve Signal
Forces Condenser Fan to 100% while in the Heat Pump
Heating Mode
NOTE: The One Condenser Head Pressure Module contains
no user-serviceable parts. Contact qualifi ed technical
personnel if your Module is not operating correctly.
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
ADDRESS
www.aaon.com
One Condenser Head Pressure Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1/
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
A3
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
A4
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. ENABLE INPUT
BIN 1
REV. VLV. INPUT ENABLE
BIN 2
BIN 3
NOT USED
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102057-A
Figure 1: One Condenser Head Pressure Module
Technical Guide
Rev.: 1J
COND. ENABLE
REV. VLV. ENABLE
NOT USED
NOT USED
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
1COrion No.:OE370-23-HP
COND. SIGNAL
NOT USED
COND. FAN
COND. FAN
NOT USED
NOT USED
LED BLINK CODES
LED NAME STAT
BLINKS QTY. OF SENSORS INSTALLED
LED NAME
NO PROBLEMS 0
NO SENSORS DETECTED 1
HIGH HEAD PRESSURE DETECTED 2
LOW HEAD PRESSURE DETECTED 3
E-BUS
Connector
AAON No.:
R74860
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
AO1
AO2
GND
R1
R2
R3
R4
RC
+24 VAC
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
R1
R2
R3
R4
Rc
RELAYS
ANALOG
OPTIONS
ALARM
STAT
COMM
3
One Condenser Head Pressure Module
Installation & Wiring
Environmental Requirements
The One Condenser Head Pressure Module needs to be installed in an
environment that can maintain a temperature range between -30°F and
150°F and not exceed 90% RH levels (non-condensing).
0.18 DIA. TYP.
+5V
5.64
5.04
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
ADDRESS
www.aaon.com
One Condenser Head Pressure Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1/
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
A3
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
A4
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. ENABLE INPUT
BIN 1
REV. VLV. INPUT ENABLE
BIN 2
BIN 3
NOT USED
COM
COMMON
E-BUS
Connector
Mounting
The One Condenser Head Pressure 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 (in inches).
5.71
0.29
R74860
AO1
AO2
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R1
R2
R2
R3
R3
R4
R4
RC
Rc
RELAYS
ANALOG
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
OPTIONS
ALARM
+24 VAC
STAT
COMM
WattMaster Label
#LB102057-A
Rev.: 1J
COND. ENABLE
REV. VLV. ENABLE
NOT USED
NOT USED
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
1COrion No.:OE370-23-HP
COND. SIGNAL
NOT USED
COND. FAN
COND. FAN
NOT USED
NOT USED
LED BLINK CODES
LED NAME STAT
BLINKS QTY. OF SENSORS INSTALLED
LED NAME
NO PROBLEMS 0
NO SENSORS DETECTED 1
HIGH HEAD PRESSURE DETECTED 2
LOW HEAD PRESSURE DETECTED 3
E-BUS
Connector
AAON No.:
GND
2.07
0.55
Figure 2: One Condenser Head Pressure Module Dimensions
4
4.14
Technical Guide
One Condenser Head Pressure Module
Installation & Wiring
Power Supply
The One Condenser Head Pressure Module requires a 24 VAC power
connection with an appropriate VA rating.
If you will be connecting the One Condenser Head Pressure Module to
any of the VCM-X series or VCM-X E-BUS series controllers, one of
the most important checks to make before powering up the system for
the fi rst time is to make sure that the controller is confi gured properly
for your application. Refer to the VCM-X Controller Technical Guide or
VCM-X Modular E-BUS Technical Guide for more information.
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.
Important Wiring Considerations
Please read carefully and apply the following information when wiring
the One Condenser Head Pressure Module:
1. To operate the One Condenser Head Pressure Module, you
must connect power to the 24 VAC input terminal block.
2. Each Pressure Transducer must have its own 18-gauge
shielded twisted pair cable. The Drain Wire must be the “Gnd”
signal for the transducer.
3. When the 2-10 VDC Analog Output is being used to control
the Condenser Fan Speed or Water Valve Percentage, the cable
must be 18-gauge shielded wire, and the Drain Wire must be
the “Gnd” signal.
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 transducers required for your
system are mounted in the appropriate location and wired into
the correct terminals.
WARNING: Be sure all controllers and modules are
powered down before connecting or
disconnecting HSSC cables.
Technical Guide
5
One Condenser Head Pressure Module
Installation & Wiring
VCM-X Modular or VCM-X WSHP
to One Condenser Head Pressure
Module Wiring
The One Condenser Head Pressure Module connects to the E-BUS
Distribution Module using a modular HSSC cable. The One Condenser
Head Pressure Module requires a 24 VAC power connection with an
appropriate VA rating.
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
AI4 SET AI5 SET AI7 SET
Jumpers
AI1 SET AI2 SET AI3 SET
AI1
AI2
AI3
AI4
AI5
AI4 SET AI5 SET AI7 SET
AI7
Splice If Required
OE332-VCMX-WSHP
VCM-X WSHP Controller
The E-BUS Distribution Module connects to the VCM-X Modular
Controller, VCM-X WSHP Controller, VCM-X Expansion Module, or
12 Relay Expansion Module using the I
2
C port. See Figure 3 below for
wiring. Up to (2) One Condenser Head Pressure Modules can be used
per E-BUS Controller.
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.
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 Thru R5 May Be UserConfigured 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
Note: 1.) When Using the HP1C Module,
All Compressors Will Be Wired From the
Protection Module, Not the VCM-X
Controller.
2.) A Total Of 20 Relays AreAvailable 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 Controller = 8 VA
Connect To Digital Room Sensor And/Or
Digital CO Sensor
2
Connect To
E-BUS
Distribution
Module
24 VAC
Line Voltage
GND
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 3: VCM-X WSHP Controller to One Condenser Head Pressure Module Wiring Diagram
6
Technical Guide
One Condenser Head Pressure Module
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.
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 WSHP Controller,
VCM-X Modular Controller,
or SA Controller
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
Set ADDRESS Dip
Switch 1 to ON for
Water Cooled or to
OFF for Air Cooled.
Currently showing
OFF for Air Cooled.
Set ADDRESS Dip
Switch 2 to OFF on all
communicating
applications unless it
is intended to be the
Second Head
Pressure Module on a
system. If set to ON, it
will not communicate.
Currently showing
OFF.
Set ADDRESS Dip
Switch 4 to OFF to
make reversing valve
"ON to Heat / OFF to
Cool” Set to ON to
make reversing valve
“ON to Cool / OFF to
Heat. Currently
showing OFF.
Installation & Wiring
WARNING: Be sure all controllers and modules are
powered down before connecting or
disconnecting HSSC cables.
One Condenser Head Pressure Module
+V
RD
WH
BK
RD
WH
BK
RD
WH
BK
RD
WH
BK
GND
GND
GND
GND
SIG
+V
SIG
+V
SIG
+V
SIG
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
ADDRESS
PWR
HSSC Cable
Connect To E-BUS
Distribution Module
OE370-23-HP1C
www.aaon.com
MAX @ 24 VAC
RATING IS 1AMP
A1
HEAD
PRESSURE
TRANSDUCER #1/
A2
HEAD
PRESSURE
TRANSDUCER #2
A3
HEAD
PRESSURE
TRANSDUCER #3
A4
HEAD
PRESSURE
TRANSDUCER #4
COND. ENABLE INPUT
REV. VLV. INPUTENABLE
NOTUSED
COMMON
WattMaster Label
#LB102057-A
Rev.: 1J
RELAYCONTACT
1COrion No.:OE370-23-HP
LEDNAME STAT
BLINKSQTY. OF SENSORS INSTALLED
LEDNAME
NOPROBLEMS 0
NOSENSORS DETECTED 1
HIGHHEAD PRESSURE DETECTED 2
LOWHEAD PRESSURE DETECTED 3
E-BUS
Connector
One Condenser Head Pressure Module
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
E-BUS
Connector
COND. ENABLE
REV. VLV. ENABLE
NOTUSED
NOTUSED
RELAYCOMMON
COND. SIGNAL
NOTUSED
COND. FAN
COND. FAN
NOTUSED
NOTUSED
LED BLINK CODES
HSSC Cable
AAON No.:
R74860
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
R1
R2
R3
R4
RC
AO1
AO2
GND
GND
+24VAC
24 VAC
R1
R2
R3
R4
Rc
RELAYS
ANALOG
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
OPTIONS
ALARM
STAT
COMM
24 VAC Transformer
3 VA Minimum
R1
R2
COMM
ALL RELAYOUTPUTS
NOTE:
ARE
NORMALLY OPENAND
RATED FOR 24 VAC POWER
ONLY - 1AMP MAXIMUM LOAD
HVAC UNIT CONNECTIONS
CONDENSER AENABLE
REV. VALVE A ENABLE
Condenser
Signal
+
COM
VCM-X Modular or
VCM-X WSHP
Controller
Condenser Fan
ECM Motor
YELLOW
BLUE +24 OUT
OPTIONS Dip Switch
Setting Not Required
When Connected To
Line Voltage
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
Duty Cycle
+24 Volts
Figure 3, cont.: VCM-X WSHP Controller to One Condenser Head Pressure Module Wiring Diagram
Technical Guide
7
One Condenser Head Pressure Module
E-BUS Controller to One Condenser Head Pressure Module Wiring
VCM-X Modular E-BUS or VCM-X WSHP
E-BUS Controller to One Condenser
Head Pressure Module Wiring
Up to (2) One Condenser Head Pressure Modules can be daisy-chained
together and connected to the E-BUS Controller using a modular HSSC
cable. The One Condenser Head Pressure Module requires a 24 VAC
power connection with an appropriate VA rating. See Figure 4 below
for wiring.
OE370-23-HP1C
www.aaon.com
One Condenser Head Pressure Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1/
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
A3
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
A4
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. ENABLE INPUT
BIN 1
REV. VLV. INPUT ENABLE
BIN 2
BIN 3
NOT USED
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102057-A
Rev.: 1J
E-BUS
Connector
Head Pressure Transducers
(One Per Refrigerant Circuit)
Set ADDRESS Dip Switch 1
to ON for Water Cooled or to
OFF for Air Cooled. Currently
showing OFF for Air Cooled.
Set ADDRESS Dip Switch 2
to OFF on all communicating
applications unless it is
intended to be the Second
Head Pressure Module on a
system. If set to ON, it will
not communicate. Currently
showing OFF.
Set ADDRESS Dip Switch 4
to OFF to make reversing
valve "ON to Heat / OFF to
Cool” Set to ON to make
reversing valve “ON to Cool /
OFF to Heat. Currently
showing OFF.
0 - 667 PSI
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
BK
GND
+V
RD
SIG
WH
BK
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.
One Condenser Head Pressure Module
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
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.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPENAND
ARE
RATED FOR 24 VAC POWER
ONLY - 1AMP MAXIMUM LOAD
CONDENSER A ENABLE
REVERSING VALVE A ENABLE
HVAC UNIT CONNECTION
Condenser
COND. ENABLE
REV. VLV. ENABLE
NOT USED
NOT USED
MAX @ 24 VAC
RATING IS 1AMP
RELAYCONTACT
RELAYCOMMON
AAON No.:
1COrion No.:OE370-23-HP
COND. SIGNAL
NOT USED
GND
COND. FAN
COND. FAN
NOT USED
NOT USED
LED BLINK CODES
LED NAME STAT
BLINKSQTY. OF SENSORS INST ALLED
LED NAME
NOPROBLEMS 0
NOSENSORS DETECTED 1
HIGHHEAD PRESSURE DETECTED 2
LOWHEAD PRESSURE DETECTED 3
R74860
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R2
R3
R4
RC
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24VAC
24 VAC
R1
R2
R3
R4
Rc
RELAYS
ANALOG
AO1
AO2
GND
OPTIONS
ALARM
STAT
COMM
Line Voltage
24 VAC Transformer
3 VA Minimum
R1
R2
COMM
YELLOW
BLUE +24 OUT
OPTIONS Dip Switch Setting Not
Required When Connected To
VCM-X Modular E-BUS or VCM-X
WSHP E-BUS Controller
Signal A
+
COM
Condenser Fan
ECM Motor
Duty Cycle
+24 Volts
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
HSSC Cable
HSSC Cable
Connect To VCM-X E-BUS
Controller or VCM-X WSHP E-BUS Controller
Figure 4: VCM-X E-BUS Controller to Two Condenser Head Pressure Module Wiring Diagram
8
Technical Guide
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