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
Coil Products
Head Pressure Module
Factory Packaged Controls
Two Condenser
Technical Guide
www.aaon.com
www.orioncontrols.com
Two Condenser Head Pressure Module
Circuit A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
Circuit A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
Circuit B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
Circuit B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A & B ENABLE
BIN 1
COOL A& B ENABLE
BIN 2
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102081-B
Rev.: 1H
RELAY CONTACT
2COrion No.:OE370-23-HP
E-BUS
Connector
RATING IS 1 AMP
MAX @ 24 VAC
COND. A ENABLE
COOL AENABLE
COND. B ENABLE
COOL B ENABLE
RELAY COMMON
AAON Coil No.:
30310
COND. A SIGNAL
COND. B SIGNAL
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
GND
AO1
AO2
GND
PWM1PWM1+
PWM2PWM2+
GND
R1
R2
R3
R4
RC
+24 VAC
Table of Contents
OVERVIEW ........................................................................................................................................................ 3
Overview ......................................................................................................................................................................................3
Features .......................................................................................................................................................................................3
INSTALLATION AND WIRING ........................................................................................................................... 4
Environmental Requirements .......................................................................................................................................................4
Mounting.......................................................................................................................................................................................4
Power Supply ...............................................................................................................................................................................4
Important Wiring Considerations ..................................................................................................................................................5
VCM-X / SA Controller to Two Condenser Head Pressure Module Wiring ..................................................................................6
E-BUS Controller to Two 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
TROUBLESHOOTING ...................................................................................................................................... 15
Head Pressure Module Valve/Fan Position Troubleshooting .....................................................................................................15
Troubleshooting for Stand Alone Mode ......................................................................................................................................16
Pressure Transducer T roubleshooting .......................................................................................... ............................................17
Using LEDs to Verify Operation..................................................................................................................................................18
LED Diagnostics .........................................................................................................................................................................19
Other Checks .............................................................................................................................................................................19
APPENDIX FOR VERSION 1.04 AND EARLIER ............................................................................................... 20
VCM-X / SA Connection Wiring ..................................................................................................................................................20
Stand-Alone Wiring ....................................................................................................................................................................21
Condenser Type Selection .........................................................................................................................................................22
Refrigerant Selection ..................................................................................................................................................................23
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION ORION AAON
COIL
VCM-X Two Condenser Head Pressure Module OE370-23-HP2C 30310
VCM-X Modular E-BUS Controller - Coil OE332-23E-VCMX-MOD-C TBA
VCM-X Modular Controller - Coil OE332-23-VCMX-MOD-C 30553
VCM-X WSHP E-BUS Controller - Coil OE332-23E-VCMX-WSHP-C TBA
VCM-X WSHP Controller - Coil OE332-23-VCMX-WSHP-C 30526
E-BUS Distribution Module - Coil OE365-23-EBD-C 30312
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
Copyright November 2013 WattMaster Controls, Inc.
®
AAON
is a registered trademark of AAON, Inc., Tulsa, OK.
WattMaster Form : AA-HP2C-C-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.
®
Two Condenser Head Pressure Module
Module Overview
Overview
NOTE: Software version 1.04 and earlier contain a few
differences from version 1.05 and later. For version
1.04 and earlier details, please see the Appendix.
The version number can be found on the upper right
of your module.
The T wo Condenser Head Pressure Module (OE370-23-HP2C) monitors
four individual head pressure transducers and controls two Condenser
Fans or Water Valves on units with two physically separate condenser
sections. The highest reading of head pressure transducers 1 & 2 controls
Condenser Signal A. The highest reading of head pressure transducers 3
& 4 controls Condenser Signal B. 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 Two Condenser Head Pressure Module is designed to work standalone by using its OPTIONS dip switch to adjust the Head Pressure
setpoint.
Up to (2) Two Condenser Head Pressure Modules can also be daisychained together and connected to the VCM-X Modular or VCM-X
WSHP Controller using the E-BUS Distribution Module, allowing the
Module(s) to receive setpoints from the Controllers, or the Module(s)
can 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 Two Condenser Head Pressure Module also provides a pulse
width modulation (PWM) signal or voltage output signal to control the
condenser fans.
The Two Condenser Head Pressure Module requires a 24 VAC power
connection with an appropriate VA rating.
Features
The Two Condenser Head Pressure Module provides the following:
Can be operated stand alone or up to (2) modules 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
Up to (2) modules can be daisy-chained together and
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 Signals based on the
highest reading of head pressure transducers
Capable of monitoring a Reverse Valve Signal
Forces Condenser Fans to 100% while in the Heat Pump
Heating Mode
NOTE: The Two Condenser Head Pressure Module contains
no user-serviceable parts. Contact qualifi ed technical
personnel if your Module is not operating correctly.
1
2
4
8
PWR
ADDRESS
OFF
SW1
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
1003
1002
10uF
1003
1002
10uF
C2
1003
1002
10uF
1003
1002
10uF
4
R7
R9
300
4
R13
R14
300
1002
R23
1002
R24
1002
R25
1002
R26
www.aaon.com
Two Condenser Head Pressure Module
Circuit A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
Circuit A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
Circuit B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
Circuit B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A & B ENABLE
BIN 1
COOL ENABLE
BIN 2
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102081
Rev.: 1H
Figure 1: Two Condenser Head Pressure Module
COND. A ENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1 AMP
RELAY CONTACT
RELAY COMMON
2COrion No.:OE370-23-HP
E-BUS
Connector
AAON Coil No.:
COND. A SIGNAL
COND. B SIGNAL
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
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
30310
GND
AO1
AO2
GND
PWM1-
PWM1+
PWM2PWM2+
ALARM
GND
R1
R2
R3
R4
RC
R34 R50
1002
1002
1002
1002
R30
R29
+24 VAC
R28
D3
D4
D12
D13
SERIAL #
PWM1-
PWM1+
PWM2-
PWM2+
AO1
AO2
GND
OFF
R1
R2
R3
R4
Rc
SW2
RELAYS
ANALOG
ALARM
STAT
COMM
C20
.01uF
TB3
OPTIONS
R53
R12
R11
R54
4751
4751
4751
4751
Technical Guide
3
Two Condenser Head Pressure Module
Installation & Wiring
Environmental Requirements
The Two 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).
Mounting
The Two 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).
0.18 DIA. TYP.
+5V
1003
SIG 1
1002
10uF
GND
+5V
1003
5.64
5.04
2
4
8
PWR
ADDRESS
1
OFF
SW1
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
Two Condenser Head Pressure Module
1002
10uF
C2
+5V
SIG 1
1003
GND
1002
10uF
+5V
SIG 2
GND
1003
+5V
1002
10uF
SIG 3
GND
4
R7
R9
300
+5V
4
R13
R14
SIG 4
300
GND
1002
R23
1002
R24
1002
BIN 1
R25
1002
R26
BIN 2
COM
E-BUS
Connector
Power Supply
The Two Condenser Head Pressure Module requires a 24 VAC power
connection with an appropriate VA rating.
If you will be connecting the T wo Condenser Head Pressure Module to
any of the VCM-X 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
Controller 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.
5.71
0.29
R12
R53
R54
R11
4751
4751
4751
4751
30310
GND
AO1
AO2
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R2
R3
R4
RC
R34 R50
+24 VAC
1002
1002
1002
1002
R30
R29
R28
D3
D4
D12
D13
SERIAL #
PWM1-
PWM1+
PWM2-
PWM2+
AO1
AO2
GND
OFF
R1
R2
R3
R4
Rc
SW2
RELAYS
ANALOG
ALARM
STAT
COMM
C20
.01uF
TB3
OPTIONS
www.aaon.com
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND. A & B ENABLE
COOL ENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
COND. A ENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
2COrion No.:OE370-23-HP
E-BUS
Connector
AAON Coil No.:
COND. A SIGNAL
COND. B SIGNAL
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
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
2.07
0.55
Note: Height is 1.49 inches.
Figure 2: Two Condenser Head Pressure Module Dimensions
4
4.14
Technical Guide
Two Condenser Head Pressure Module
Installation & Wiring
Important Wiring Considerations
Please read carefully and apply the following information when wiring
the Two Condenser Head Pressure Module:
1. To operate the Two 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.
OE370-23-HP2C-C
Two Condenser Head Pressure Module
Head Pressure Transducers
(One Per Refrigerant Circuit)
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
CONDENSER ON/OFF (Y1 CALL)
COOLING ENABLE (O CALL)
Set ADDRESS Dip Switch 1 to ON
for Water Cooled or to OFF for Air
Cooled. Currently showing OFF for
Set ADDRESS Dip Switch 3 to ON
Air Cooled.
to disable Circuit B alarms when
only one Condenser is Used.
Currently showing OFF.
ADDRESS Dip Switch 4 should
always be set to ON to make
reversing valve "ON to Cool / OFF
to Heat". Currently showing ON.
COM
PWR
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
Two Condenser Head Pressure Module
GND
+5V
+5V
SIG 1
SIG 3
GND
GND
+5V
SIG 2
+5V
GND
SIG 4
+5V
SIG 3
GND
GND
BIN 1
+5V
SIG 4
BIN 2
GND
COM
BIN 1
BIN 2
COM
E-BUS
Connector
www.aaon.com
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND. A & B ENABLE
COOL ENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
Connector
4. If the Pulse Width Modulation (PWM) Output is being used to
directly control the ECM 142 motor, the wires do not need to
be shielded and can be any 18-gauge wire.
5. 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.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
- 1 AMP MAXIMUM LOAD
ONLY
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
30310
GND
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
AO1
AO2
R1
R1
R2
R2
R3
R3
R4
R4
RC
Rc
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
RELAYS
ANALOG
ALARM
STAT
COMM
R1
R3
COMM
OPTIONS
OPTIONS Dip Switch is
Used for Setting the Head
Pressure Setpoint if Not
Using Default Setpoint.
24 VAC
Line Voltage
COND. A ENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
2COrion No.:OE370-23-HP
E-BUS
AAON Coil No.:
COND. A SIGNAL
COND. B SIGNAL
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
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
Condenser
Signal A
+
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
+
COM
Condenser Fan B
ECM Motor
+
COM
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.
Figure 3: Two Condenser Head Pressure Module Wiring Diagram
Technical Guide
24 VAC Transformer
3 VA Minimum
Revised 7/26/11
5
Two Condenser Head Pressure Module
VCM-X Controller to Two Condenser Head Pressure Module Wiring
VCM-X Modular or VCM-X WSHP
Controller to Two Condenser Head
Pressure Module Wiring
Up to (2) T wo Condenser Head Pressure Modules can be daisy-chained
together and connected to the E-BUS Distribution Module using a modular HSSC cable. The Two 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
AI1
AI2
AI3
AI4
AI5
AI7
OE332-23-VCMX-WSHP
VCM-X WSHP Controller
AI1 SET AI2 SET AI3 SET
AI4 SET AI5 SET AI7 SET
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 4 below
for wiring.
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 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 AreAvailable By
Adding Relay Expansion Modules. All
Expansion Module Relay Outputs Are UserConfigurable As Listed Above.
24 VAC
GND
Line Voltage
24VAC
Size Transformer For Correct
AI4 SET AI5 SET AI7 SET
Total Load.
VCM-X Controller = 8 VA
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
Connect To E-BUS Distribution Module
or Expansion Module(s) (When Used)
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 Digital Room Sensor And/Or
Digital CO Sensor
2
Figure 4: VCM-X WSHP Controller to Two Condenser Head Pressure Module Wiring Diagram
6
Technical Guide
Connect To
E-BUS
Distribution
Module
GND
Line Voltage
Two Condenser Head Pressure Module
VCM-X Controller to Two Condenser Head Pressure Module Wiring
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.
Head Pressure Transducers
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 or
VCM-X Modular Controller,
0 - 667 PSI
(One Per Refrigerant Circuit)
RD
WH
BK
RD
WH
BK
RD
WH
BK
RD
WH
BK
Set ADDRESS Dip
Switch 1 to ON for
Water Cooled or to
OFF for Air Cooled.
Currently showing
OFF for Air Cooled.
If Using (2)
Modules, Set
ADDRESS Dip
Switch 2 to OFF for
Address 1 or to ON
for Address 2.
to OFF if Using (1)
Module. Currently
Set ADDRESS Dip
Switch 3 to ON to
alarms when only
one Condenser is
reversing valve "ON
showing OFF.
disable Circuit B
Used. Currently
showing OFF.
ADDRESS Dip
Switch 4 should
always be set to
ON to make
to Cool / OFF to
Heat". Currently
showing ON.
Set
WARNING: Be sure all controllers and modules are
powered down before connecting or
disconnecting HSSC cables.
Two Condenser Head Pressure Module
+V
+5V
SIG
SIG 1
GND
GND
+V
+5V
SIG
SIG 2
GND
GND
+V
+5V
SIG
SIG 3
GND
GND
+V
+5V
SIG
SIG 4
GND
GND
BIN 1
BIN 2
COM
ADDRESS
PWR
Connect To E-BUS
Distribution Module
OE370-23-HP2C-C
www.aaon.com
Two Condenser Head Pressure Module
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
COM
E-BUS
Connector
HSSC Cable
WARNING!! Observe Polarity! All
boards must be wired with GND-toGND and 24 VAC-to-24 VAC.
Failure to observe polarity could
result in damage to the boards.
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND.A & B ENABLE
COOLENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
E-BUS
Connector
2COrion No.:OE370-23-HP
COND.A ENABLE
COOLENABLE
COND. B ENABLE
COOLENABLE
MAX @ 24 VAC
RATINGIS 1 AMP
RELAYCONTACT
RELAYCOMMON
AAON Coil No.:
30310
COND.A SIGNAL
COND. B SIGNAL
GND
COND. FANA
COND. FANA
COND. FAN B
COND. FAN B
LED BLINKCODES
LED NAME STAT
BLINKSQTY. OF SENSORS INSTALLED
LED NAME
NOPROBLEMS 0
NOSENSORS DETECTED 1
HIGHHEAD PRESSURE DETECTED 2
LOWHEAD PRESSURE DETECTED 3
GND
HSSC Cable
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
Line Voltage
24 VAC Transformer
3 VA Minimum
R1
R3
COMM
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPENAND
ARE
RATED FOR 24 VAC POWER
ONLY - 1AMP MAXIMUM LOAD
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
Condenser Fan A
ECM Motor
Condenser Fan B
ECM Motor
OPTIONS Dip Switch Setting Not
Required When Connected To
VCM-X Modular, VCM-X WSHP
or SA Controller
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
Condenser
Signal A
+
COM
Condenser
Signal B
+
COM
+
COM
+
COM
Figure 4, cont.: VCM-X WSHP Controller to Two Condenser Head Pressure Module Wiring Diagram
Technical Guide
7
Two Condenser Head Pressure Module
E-BUS Controller to Two Condenser Head Pressure Module Wiring
VCM-X Modular E-BUS or VCM-X WSHP
E-BUS Controller to Two Condenser
Head Pressure Module Wiring
Up to (2) T wo Condenser Head Pressure Modules can be daisy-chained
together and connected to the E-BUS Controller using a modular HSSC
cable. The Two Condenser Head Pressure Module requires a 24 VAC
power connection with an appropriate VA rating. See Figure 5 below
for wiring.
OE370-23-HP2C-C
www.aaon.com
RATINGIS 1 AMP
#LB102081
Rev.: 1H
RELAYCONTACT
2COrion No.:OE370-23-HP
LED NAME STAT
BLINKSQTY. OF SENSORS INSTALLED
LED NAME
NOPROBLEMS 0
NOSENSORS DETECTED 1
HIGHHEAD PRESSURE DETECTED 2
LOWHEAD PRESSURE DETECTED 3
E-BUS
Connector
Two Condenser Head Pressure Module
Circuit A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
Circuit A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
Circuit B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
Circuit B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A& B ENABLE
BIN 1
COOL ENABLE
BIN 2
COM
COMMON
WattMaster Label
E-BUS
Connector
COND. AENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RELAYCOMMON
AAON Coil No.:
COND. ASIGNAL
COND. B SIGNAL
COND. FANA
COND. FANA
COND. FAN B
COND. FAN B
LED BLINKCODES
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
RD
WH
BK
RD
WH
BK
RD
WH
BK
RD
WH
BK
Set ADDRESS Dip Switch 1 to ON for
Water Cooled or to OFF for Air Cooled.
Currently showing OFF for Air Cooled.
If Using (2) Modules, Set ADDRESS Dip
Switch 2 to OFF for Address 1 or to ON
for Address 2.
Module. Currently showing OFF.
Set ADDRESS Dip Switch 3 to ON to
disable Circuit B alarms when only one
Condenser is Used. Currently showing
ADDRESS Dip Switch 4 should always
be set to ON to make reversing valve
"ON to Cool / OFF to Heat". Currently
Set to OFF if Using (1)
OFF.
showing ON.
Two Condenser Head Pressure Module
+V
SIG
GND
SIG
GND
SIG
GND
SIG
GND
+5V
SIG 1
GND
+V
+5V
SIG 2
GND
+V
+5V
SIG 3
GND
+V
+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.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
ONLY - 1 AMP MAXIMUM LOAD
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
Condenser
Signal A
+
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
+
COM
Condenser Fan B
ECM Motor
+
COM
GND
30310
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R2
R3
R4
RC
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
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
R3
COMM
OPTIONS Dip Switch Setting Not
Required When Connected To
VCM-X E-BUS Controller
or SA E-BUS Controller
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
WARNING!! Observe Polarity! All
boards must be wired with GND-toGND and 24 VAC-to-24 VAC.
Failure to observe polarity could
result in damage to the boards.
HSSC Cable
Connect To VCM-X E-BUS Controller
HSSC Cable
Figure 5: VCM-X E-BUS Controller to Two Condenser Head Pressure Module Wiring Diagram
8
Technical Guide
Two Condenser Head Pressure Module
E-BUS Controller to Two Condenser Head Pressure Module Wiring
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.
Local Loop
RS-485
9600 Baud
OE332-23E-VCMX-MOD-C
VCM-X Modular
E-BUS Controller
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-C
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
WattMaster Label
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 PROOF FAIL 3 3
DIRTY FILTER 4 3
EMERGENCY SHUTDOWN 5 3
LOW SAT 1 4
HIGH SAT 2 4
CONT. TEMP COOLFAIL 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.:
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 Controller = 8 VA
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 Two Condenser Head Pressure Module Wiring Diagram
Technical Guide
9
Two Condenser Head Pressure Module
Stand-Alone Wiring
Stand-Alone Wiring
To operate the Two Condenser Head Pressure Module as Stand Alone,
connect the Module to a 24 VAC connection with an appropriate VA
rating. See Figure 6 for wiring.
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.
OE370-23-HP2C-C
Two Condenser Head Pressure Module
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
BK
GND
+V
RD
SIG
WH
BK
GND
CONDENSER ON/OFF (Y1 CALL)
COOLING ENABLE (O CALL)
Set ADDRESS Dip Switch 1 to ON
for Water Cooled or to OFF for Air
Cooled. Currently showing OFF for
Set ADDRESS Dip Switch 3 to ON
reversing valve "ON to Cool / OFF
Air Cooled.
to disable Circuit B alarms when
only one Condenser is Used.
Currently showing OFF.
ADDRESS Dip Switch 4 should
always be set to ON to make
to Heat". Currently showing ON.
COM
PWR
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
Two Condenser Head Pressure Module
GND
+5V
+5V
SIG 1
SIG 3
GND
GND
+5V
SIG 2
+5V
GND
SIG 4
+5V
SIG 3
GND
GND
BIN 1
+5V
SIG 4
BIN 2
GND
COM
BIN 1
BIN 2
COM
E-BUS
Connector
www.aaon.com
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND. A & B ENABLE
COOL ENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
Connector
Condenser Type Selection
As shown in Figure 6, set ADDRESS dip switch 1 to ON for water
cooled or to OFF for air cooled. Refer to page 11 for further instructions.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
- 1 AMP MAXIMUM LOAD
ONLY
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
Condenser
Signal A
+
30310
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
GND
AO1
AO2
R1
R1
R2
R2
R3
R3
R4
R4
RC
Rc
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
RELAYS
ANALOG
R1
R3
COMM
OPTIONS
ALARM
STAT
COMM
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
+
COM
Condenser Fan B
ECM Motor
+
COM
OPTIONS Dip Switch is
Used for Setting the Head
Pressure Setpoint if Not
Using Default Setpoint.
24 VAC
Line Voltage
COND. A ENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
2COrion No.:OE370-23-HP
E-BUS
AAON Coil No.:
COND. A SIGNAL
COND. B SIGNAL
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
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
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.
Figure 6: Two Condenser Head Pressure Module as Stand-Alone
10
Revised 7/26/11
24 VAC Transformer
3 VA Minimum
Technical Guide
Two Condenser Head Pressure Module
Sequence of Operation
General
The following inputs and outputs are available on the Two Condenser
Head Pressure Module. See Table 1 below to reference the Input/
Output Map.
Binary Inputs
1 Condenser Fans A & B On/Off (24 VAC Wet Input)
2 Cooling Enable (24 VAC Wet Input)
Binary Outputs
Condenser A Enable Relay
1
(Dry Contact Output Rated for 24 VAC)
Cooling Enable
2
(Dry Contact Output Rated for 24 VAC)
Condenser B Enable Relay
3
(Dry Contact Output Rated for 24 VAC)
Cooling Enable
4
(Dry Contact Output Rated for 24 VAC)
Analog Inputs
1 Head Pressure #1 (0-667 PSI Sensor)
2 Head Pressure #2 (0-667 PSI Sensor)
3 Head Pressure #3 (0-667 PSI Sensor)
4 Head Pressure #4 (0-667 PSI Sensor)
Analog Outputs (0-10 or 2-10 VDC)
1 Condenser Signal A (AOUT 1)
2 Condenser Signal B (AOUT 2)
PWM Output
1 ECM 142 PWM Input (0-100% Duty Cycle)
2 ECM 142 PWM Input (0-100% Duty Cycle)
Stand-Alone Input Commands
Condenser On/Off
A 24 volt signal to Binary Input #1 initiates the Condenser Enable
function. Typically, the source for this signal is the “Y” call from the
thermostat calling for a compressor to run.
Cooling Enable On/Off
A 24 volt signal to Binary Input #2 initiates the Cooling Enable On
function. Typically, the source for this signal is the “O” call from the
thermostat. A signal on this input indicates indicates the reversing valve
has been energized and that the unit is in the
Head Pressure Setpoint
The Head Pressure Setpoint is set using the OPTIONS Dip Switches. See
Table 2. The Default Setpoint for an Air Cooled Condenser is 340 for
410-A refrigerant. The Default Setpoint for a Water Cooled Condenser
is 235 for 410-A refrigerant. Set the OPTIONS Dip Switch to 0 if using
these Default Settings. In addition, if using the Default Settings, you
must set the Address Dip Switch. See “ADDRESS Dip Switch” below.
You must cycle power after setting Dip Switch values.
NOTE: The only setpoint available for adjustment by the con-
tractor is the Head Pressure Setpoint. The rest of the
setpoints described can only be changed by the factory.
ADDRESS Dip Switch Settings for Condenser
Type Selection
When using the OPTIONS Dip Switch to set the Head Pressure Setpoint,
you must also set the ADDRESS Dip Switch to designate the type of
condenser you are using.
Set ADDRESS Dip Switch 1 to ON for a Water Cooled Condenser or
to OFF for an Air Cooled Condenser.
Cooling Mode.
Table 1: Two Condenser Head Pressure Module
Inputs & Outputs
Technical Guide
If set to ON for a W ater Cooled Condenser, the Analog Condenser Output
Signal will be 2-10 VDC for the Water Valve. If set to OFF for an Air
Cooled Condenser, the Analog Condenser Output Signal will be 0-10
VDC for the Condenser Fan.
You must cycle power after setting Dip Switch values. See Figure 6
for ADDRESS Dip Switch location and Table 3 for Setting information.
11
Two Condenser Head Pressure Module
Sequence of Operation
Input Commands (VCM-X Connection)
Condenser On/Off
Instead of a hard wired input signal to the Condenser Enable input,
the VCM-X Modular or VCM-X WSHP Controller communicates
to the Module via E-BUS communications. This signal indicates the
compressor(s) are called to run and drives the condenser A & B On/
Off function.
Cooling Enable On/Off
As with the Condenser Signal On/Off function, the VCM-X Modular
or VCM-X WSHP Controller communicates to the Module via E-BUS
communications and signals that the reversing valve has been energized
and that cooling has been enabled.
NOTE: When the term “ON” is used, it means there is either 24
VAC on the appropriate Binary Input or a call-to-run
signal is being received from a VCM-X series controller.
When the term “OFF” is used, it means there is either 0
VAC on the appropriate Binary Input or the call-to-run
signal from a VCM-X series controller has been removed.
Sensor Reading Routine
The Two Condenser Head Pressure Module is used on units with two
physically separate condenser sections. Up to two Head Pressure Sensors
can be monitored in each section. The highest of the two readings in each
section will be used to control the condenser fan(s) in that section.
Air from the condenser fan(s) in each section fl ows through both con-
denser coils. As a result, if you modulate the fan(s) based on the highest
reading, you will have enough air fl ow for both coils.
The highest reading of Head Pressure Sensors 1 & 2 controls Condenser
Fan A. The highest reading of Head Pressure Sensors 3 & 4 controls
Condenser Fan B.
Modes of Operation
OFF Mode
The Head Pressure Control Board is in the OFF Mode when the Condenser Input Signal is “OFF”. In this mode, all relays are off, the Analog
Output is 0 VDC, and the PWM Output is 0% Duty Cycle.
Cooling Mode
The Head Pressure Control board is in the Cooling Mode when the
Condenser Input Signal is “ON” and the Cooling Enable signal is “ON”.
The Condenser Enable Relays will energize to enable the Condenser
Fans or Water Valves, and the Cool Enable Relays will energize. In a
water system, the Water Flow Valve will start at 75% for 3 minutes. In
an air system, the Condenser Signal will go to 50% for 30 seconds. The
Condenser Output Signals will then automatically adjust between 0 and
100% to maintain the desired Head Pressure Setpoint. The Condenser
Output Signals can be a 0-10 VDC, 2-10 VDC or 0-100% PWM signal
provided by the appropriate output. Both outputs mirror each other.
NOTE: The Cooling enable outputs are for indication only and
are not wired to anything.
Heat Pump Mode
The Head Pressure Control Module is in the Heat Pump Mode when
the Condenser Input Signal is “ON” and the Cooling Enable signal is
“OFF”. In this mode, the Condenser Output Signals will go to 100%
and remain there until the unit leaves this mode.
12
Technical Guide
Two Condenser Head Pressure Module
Sequence of Operation
OPTIONS Dip
Switch Settings
Binary Value R410-A R410-A
0 340 (DEFAULT) 235 (DEFAULT)
1 260 210
2 270 220
3 280 230
4 290 240
5 300 250
6 310 260
7 320 270
8 330 280
9 340 290
10 350 300
11 360 310
12 370 320
13 380 330
14 390 340
15 400 350
NOTE: You must cycle power after setting Dip Switch values.
Air Cooled Condenser Water Cooled Condenser
Head Pressure Setpoint
Table 2: OPTIONS Dip Switch/Head Pressure Setpoint Settings for Stand-Alone Operation
ADDRESS Dip Switch Settings
Switch 1 Switch 2 Default SP Description of Default Head Pressure Setpoint
0 0 340 Air Cooled Condenser using R410-A Refrigerant
1 0 235 Water Cooled Condenser using R410-A Refrigerant
Switch 1 determines Air or Water Cooled Condenser
NOTE: You must cycle power after setting Dip Switch values.
Table 3: ADDRESS Dip Switch Condenser Type Settings for Stand-Alone Operation
Technical Guide
13
Two Condenser Head Pressure Module
Sequence of Operation
ADDRESS Dip Switch 2 Settings
Switch Description
OFF
ON Address 2 if Using (2) Head Pressure Modules
Table 4: ADDRESS Dip Switch Address Settings When Connected to VCM-X / SA
Address 1 if Using (2) Head Pressure Modules
(Set to OFF if using only (1) Head Pressure Module)
ADDRESS Dip Switch 3 Settings
Switch Description
OFF Enable Circuit B Alarm
ON
Disable Circuit B Alarm when only one condenser is
used.
Table 5: ADDRESS Dip Switch 3 Settings
ADDRESS Dip Switch 4 Settings
Switch Description
ON Reversing Valve On to Cool / Off to Heat
OFF Reversing Valve On to Heat / Off to Cool
This Dip Switch should be set to ON for AAON Coil operations.
Table 6: ADDRESS Dip Switch 4 Settings for Reversing Valve
14
Revised 11/2/11
Technical Guide
Two Condenser Head Pressure Module
Troubleshooting
Head Pressure Module Valve/Fan
Position Troubleshooting
If confi gured for Water valve:
Aout Signal is 2 to 10 volts.
2 volts = 0% valve position or fully closed
10 volts = 100% valve position or fully open
PWM signal is not used for water valve but does modulate.
At Startup for cooling, valve will open to 75% or 8 volts for 3
minutes then will modulate every 30 seconds to try to maintain
head pressure setpoint.
For heating, valve will open and stay at 100%.
If confi gured for Air Condenser Fan:
Aout Signal is 0 to 10 volts.
Minimum fan speed is 1.5 volts. ( 15%)
Maximum fan speed is 10 volts. ( 100%)
Anything less than 1.5 volts the fan will be off.
PWM 0 volts = 100% fan speed
6 volts = 75% fan speed
12 volts = 50% fan speed
18 volts = 25% fan speed
20.4 volts = 15% fan speed
Above 20.4 volts = 0% fan speed
At Startup for cooling, fan will start at 50% then will
modulate every 30 seconds to try to maintain head pressure
setpoint.
For heating, fan will run and stay at 100%.
Safeties:
If head pressure signal is above 500 psig, fan will go to 100%
(high pressure safety).
If head pressure signal is below 1 psig, fan will go to 100%
(assuming bad sensor).
PWM signal is 0 to 100%
PWM+ (to ground) will always read 24 vdc.
PWM- (to ground) can be measured for volts dc and this
formula will tell you the percentage signal: (24 – measured
value)/24 (measured value = PWM- to ground)
Technical Guide
Revised 11/5/13
15
Two Condenser Head Pressure Module
Troubleshooting
Troubleshooting for Stand Alone Mode
If you suspect or encounter general problems during operation of the
Two Condenser Head Pressure Module while in Stand Alone Mode,
follow the Troubleshooting Flowchart in Figure 7 below.
Head Pressure Control
Troubleshooting Flowchart
(Stand Alone Mode)
Start Here
Yes
“STAT” LED
Blinking
No
Verify
Incoming
Power
No
Is
?
No
Is There
@ “PWR”
24VAC
Testpoint
Fan Speed
or Water Valve
Position Will
Be at
Is
Condenser
A or B Fan or
Water Valve
Operating?
No
“ERROR”
LED Blinking
?
Call WattMaster
Technical
Support
100%
No
Is
Yes
Yes
?
Yes
Yes
Heat
Inputs
Active
BIN 2
Are
Enable
A& B
High
Blinks
2
Is
“ERROR”
No
Is
# of
Sensors
No
?
LED
?
LED Blinking
Note: “STAT” LED
will blink the # of
Good sensors
connected
“STAT”
Yes
?
blinking correct
Check wiring
on all sensors
1 Blink =
None of the
Yes
Sensors are
Detected
Check wiring
on all sensors
Measure DC
Volts between
SIGx & GND for
all sensors
Compare readings
Call AAON
Technical
Support
to chart
=
Pressure on one
of the Sensors
(More than
600 PSI)
Check
Refrigerant
Charge on
All Circuits
3 Blinks =
Lo Pressure
On one of
the Sensors
Less than 35 PSI
Check
Refrigerant
Charge on
All Circuits
Measure DC
Volts between
&
Lower
Monitor DC
Volts on
A ut 1 & 2O
A ut 1 & 2 VoltageO
should Modulate
Down to a Min
voltage of 0VDC
(See Sequence)
Pressure is
than Setpoint
Same
There will
be No
Change on
A ut 1O& 2
??
?
Higher
Monitor DC
Volts on A ut 1O
& A ut 2O
A ut VoltageO 1 & 2
Should Modulate
Up to a Max
Voltage of 10VDC
(See Sequence)
GND for
SIGx
All sensors
Compare readings
Call AAON
Technical
to chart
Support
.
.
Figure 7: Two Condenser Head Pressure Module Troubleshooting Diagram
16
Technical Guide
Two Condenser Head Pressure Module
Pressure Transducer Troubleshooting
If you suspect there is a problem with the Module related to pressure
transducer measurements, reference Table 7 below.
Pressure Sensor Chart
Voltage Pressure Voltage Pressure
0.5 0 2.6 350
0.6 17 2.7 367
0.7 33 2.8 384
0.8 50 2.9 400
0.9 67 3.0 417
1.0 83 3.1 434
1.1 100 3.2 450
1.2 117 3.3 467
1.3 133 3.4 484
1.4 150 3.5 500
1.5 167 3.6 517
1.6 183 3.7 534
1.7 200 3.8 550
1.8 217 3.9 567
1.9 233 4.0 584
2.0 250 4.1 600
2.1 267 4.2 617
2.2 283 4.3 634
2.3 300 4.4 650
2.4 317 4.5 667
2.5 334
Troubleshooting
Table 7: Two Condenser Head Pressure Module
Transducer Chart
Technical Guide
17
Two Condenser Head Pressure Module
Troubleshooting
Using LEDs to Verify Operation
The Two Condenser Head Pressure Module is equipped with LEDs
that can be used to verify operation and perform troubleshooting. There
are LEDs for communication, operation modes, diagnostic codes, and
relays. The Two Condenser Head Pressure Module has eight LEDs—
one for power, one for operation status, one for communication, one
for alarms, and four for compressor relays. See Figure 8 for the LED
locations. The LEDs associated with these inputs and outputs allow
you to see what is active without using a voltmeter.
Status LEDs
“COMM” - This LED will light up to indicate Communications with
the VCM-X series controller. If Communications are established,
the COMM LED will blink. You should not see this LED light up in
stand-alone mode, because there would be no communications with the
VCM-X series controller.
“ALARM” - This is the diagnostic blink code LED. It will light up and
blink out diagnostic codes. See Table 8 below for Diagnostic Blink
Code descriptions. The blink code descriptions are also located on the
Module’s front cover.
No. of
Blinks
0 No Problems
1 No Sensors Detected
2 High Head Pressure Detected
3 Low Head Pressure Detected
Status
Module LEDs
“R1” - This LED will light up whenever Condenser A Enable Relay is
enabled and will stay lit as long as the relay is active.
“R2” - This LED will light up when the Heating Enable A is enabled
and will stay lit as long as the Heating Enable A is active.
“R3” - This LED will light up whenever Condenser B Enable Relay is
enabled and will stay lit as long as the relay is active.
“R4” - This LED will light up when the Heating Enable B is enabled
and will stay lit as long as the Heating Enable B is active.
Table 8: ALARM LED Blink Codes
“STAT” - This is the status blink code LED. It will light up and fi rst
blink the address of the Module. It will then blink out the quantity of
sensors installed. See T able 9 below for Status Blink Code descriptions.
The blink code descriptions are also located on the Module’s front cover .
No. of
Blinks
Random Blinks Quantity of Sensors
Installed
Status
Table 9: STAT LED Blink Codes
Figure 8: LED Locations
18
Technical Guide
Two Condenser Head Pressure Module
Troubleshooting
LED Diagnostics
“PWR” LED: When the Two Condenser Head Pressure 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 wiring is connected to the board, the connections
are tight, and the VCM-X series controller is powered. If after making
all these checks, the PWR LED does not light up, the module is probably defective.
“COMM” LED: When the Two Condenser Head Pressure Module is
powered up while in Stand Alone Mode, the COMM LED does not light
up. When the module is connected to a VCM-X series controller, the
COMM LED should light up, indicating Communications. Each time
Communications are detected, this LED should continuously blink on
and off, for a half second. This LED should never stop checking for a
Communications signal. If it does not light up, check to be sure that the
power wiring is connected to the board, the connections are tight, and
the VCM-X series controller is powered. If after making all these checks,
the COMM LED does not light up, the board is probably defective.
“ST AT” LED: As previously described, when the module is fi rst pow-
ered up, the STAT LED will blink out the number of installed sensors
“ALARM” LED: As previously described, this LED will blink on and
off to indicate alarms and diagnostics.
Other Checks
NOTE: The Two Condenser Head Pressure Module contains
no user-serviceable parts. Contact qualifi ed technical
personnel if your module is not operating correctly.
Technical Guide
19
Two Condenser Head Pressure Module
Appendix for Version 1.04 and Earlier
Version 1.04 and Earlier
V ersion 1.04 and earlier have several dif ferences from version 1.07 and
later. Please refer to the Dipswitches in Figur es 9 & 10 and the Tables
10 & 11 for detailed information.
OE370-23-HP2C-C
Two Condenser Head Pressure Module
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
+V
RD
WH
BK
RD
WH
BK
RD
WH
BK
RD
WH
BK
Set ADDRESS Dip Switch
1 to ON for Water Cooled
or to OFF for Air Cooled.
Currently showing OFF for
Air Cooled.
If Using (2) Modules, Set
ADDRESS Dip Switch 2 to
OFF for Address 1 or to ON
for Address 2.
ADDRESS Dip Switch 4
should always be set to ON
to make reversing valve
"ON to Cool / OFF to
Heat". Currently showing
ON.
SIG
GND
+V
SIG
GND
+V
SIG
GND
+V
SIG
GND
PWR
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
Two Condenser Head Pressure Module
GND
+5V
+5V
SIG 1
SIG 3
GND
GND
+5V
SIG 2
+5V
GND
SIG 4
+5V
SIG 3
GND
GND
BIN 1
+5V
SIG 4
BIN 2
GND
COM
BIN 1
BIN 2
COM
E-BUS
Connector
www.aaon.com
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND. A& B ENABLE
COOL ENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
2COrion No.:OE370-23-HP
E-BUS
Connector
VCM-X / SA Connection
Version 1.04 and earlier do not utilize Dipswitch 2 when the module is
connected to a VCM-X or SA Series Controller.
ALL RELAY OUTPUTS
NOTE:
ARE
NORMALLY OPEN AND
RATED FOR 24 VAC POWER
ONLY - 1 AMP MAXIMUM LOAD
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
Condenser
Signal A
+
COND. AENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAYCONTACT
RELAYCOMMON
AAON Coil No.:
30310
COND. ASIGNAL
COND. B SIGNAL
GND
COND. FANA
COND. FANA
COND. FAN B
COND. FAN B
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
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R1
R2
R2
R3
R3
R4
R4
RC
Rc
AO1
AO2
GND
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
24 VAC
R1
R3
COMM
RELAYS
ANALOG
OPTIONS
ALARM
STAT
COMM
Line Voltage
24 VAC Transformer
3 VA Minimum
OPTIONS Dip Switch Setting Not
Required When Connected To
VCM-X E-BUS Controller
or SA E-BUS Controller
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
+
COM
Condenser Fan B
ECM Motor
+
COM
Connect To Other
WattMaster-Approved
E-BUS Expansion Module(s)
HSSC Cable
HSSC Cable
Connect To VCM-X E-BUS
Controller
Figure 9: Version 1.04 and Earlier One Condenser Head Pressure Module Wiring Diagram
(VCM-X / SA Connection)
20
Technical Guide
Two Condenser Head Pressure Module
Appendix for Version 1.04 and Earlier
Stand-Alone Wiring
Versions 1.01 through 1.04 utilize Dipswitch 2 in stand-alone mode
for refrigeration selection. See Tables 10 & 11 for further information.
OE370-23-HP2C-C
Two Condenser Head Pressure Module
Head Pressure Transducers
0 - 667 PSI
(One Per Refrigerant Circuit)
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
GND
BK
+V
RD
SIG
WH
BK
GND
+V
RD
SIG
WH
BK
GND
CONDENSER ON/OFF (Y1 CALL)
COOLING ENABLE (O CALL)
COM
Set ADDRESS Dip Switch 1 to ON
for Water Cooled or to OFF for Air
Cooled. Currently showing OFF for
Set ADDRESS Dip Switch 2 to OFF
for R410-A Refrigerant or to ON for
R22 Refrigerant. Currently showing
Air Cooled.
OFF for R410-A Refrigerant.
Set ADDRESS Dip Switch 3 to ON
to disable Circuit B alarms when
only one Condenser is Used.
Currently showing OFF.
ADDRESS Dip Switch 4 should
always be set to ON to make
reversing valve "ON to Cool / OFF
to Heat". Currently showing ON.
PWR
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
Two Condenser Head Pressure Module
GND
+5V
+5V
SIG 1
SIG 3
GND
GND
+5V
SIG 2
+5V
GND
SIG 4
+5V
SIG 3
GND
GND
BIN 1
+5V
SIG 4
BIN 2
GND
COM
BIN 1
BIN 2
COM
E-BUS
Connector
www.aaon.com
2COrion No.:OE370-23-HP
Circuit A1
HEAD
PRESSURE
TRANSDUCER #1
Circuit A2
HEAD
PRESSURE
TRANSDUCER #2
Circuit B1
HEAD
PRESSURE
TRANSDUCER #3
Circuit B2
HEAD
PRESSURE
TRANSDUCER #4
COND. A& B ENABLE
COOL ENABLE
COMMON
WattMaster Label
#LB102081
Rev.: 1H
E-BUS
Connector
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.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
- 1 AMP MAXIMUM LOAD
ONLY
COND. AENABLE
COOL ENABLE
COND. B ENABLE
COOL ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
AAON Coil No.:
COND. ASIGNAL
COND. B SIGNAL
COND. FANA
COND. FANA
COND. FAN B
COND. FAN B
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
30310
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
AO1
AO2
GND
R3
R4
24 VAC
CONDENSER A ENABLE
CONDENSER B ENABLE
HVAC UNIT CONNECTION
Condenser
Signal A
+
R1
R1
R2
R2
R3
R4
RC
Rc
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
RELAYS
ANALOG
R1
R3
COMM
OPTIONS
ALARM
STAT
COMM
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
+
COM
Condenser Fan B
ECM Motor
+
COM
OPTIONS Dip Switch is
Used for Setting the Head
Pressure Setpoint if Not
Using Default Setpoint.
Line Voltage
24 VAC Transformer
3 VA Minimum
Figure 10: Version 1.04 and Earlier One Condenser Head Pressure Module Wiring Diagram (Stand-Alone)
Technical Guide
21
Two Condenser Head Pressure Module
Appendix for Version 1.04 and Earlier
OPTIONS Dip
Switch Settings
Binary Value R410-A R22 R410-A R22
0 340 (DEFAULT) 200 (DEFAULT) 235 (DEFAULT) 145 (DEFAULT)
1 260 160 210 110
2 270 170 220 120
3 280 180 230 130
4 290 190 240 140
5 300 200 250 150
6 310 210 260 160
7 320 220 270 170
8 330 230 280 180
9 340 240 290 190
10 350 250 300 200
11 360 260 310 210
12 370 270 320 220
13 380 280 330 230
14 390 290 340 240
15 400 300 350 250
NOTE: R22 refrigerant can only be used with the Two Condenser Head Pressure Module versions 1.01 through 1.04.
You must cycle power after setting Dip Switch values.
Air Cooled Condenser Water Cooled Condenser
Head Pressure Setpoint
Table 10: OPTIONS Dip Switch/Head Pressure Setpoint Settings for Stand-Alone Operation
22
Technical Guide
Two Condenser Head Pressure Module
Appendix for Version 1.04 and Earlier
ADDRESS Dip Switch 1 & 2 Settings
Switch 1 Switch 2 Default SP Description of Default Head Pressure Setpoint
OFF OFF 340 Air Cooled Condenser using R410-A Refrigerant
OFF ON 200 Air Cooled Condenser using R22 Refrigerant
ON OFF 235 Water Cooled Condenser using R410-A Refrigerant
ON ON 145 Water Cooled Condenser using R22 Refrigerant
Switch 1 determines Air or Water Cooled Condenser
Switch 2 determines R410-A or R22 refrigerant
NOTE: R22 refrigerant can only be used with the Two Condenser Head Pressure Module versions 1.01 through 1.04.
You must cycle power after setting Dip Switch values.
Table 11: ADDRESS Dip Switch Refrigerant and Condenser Type Settings for Stand-Alone Operation
Technical Guide
23
www.aaon.com
AAON Coil Products
203 Gum Springs Road • Longview, TX 75602-1721
Ph: (903) 236-4403 • Fax: (903) 236-4463
WattMaster Manual Form No: AA-HP2C-C-TGD-01L
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