Two Condenser
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
Head Pressure II Module
Technical Guide
COND. A ENABLE
RATING IS 1 AMP
RELAY CONTACT
2C2Orion No.:OE370-23-HP
E-BUS
Connector
MAX @ 24 VAC
REV. VLV. AENABLE
COND. B ENABLE
REV. VLV. B ENABLE
RELAY COMMON
COND. A SIGNAL
COND. B SIGNAL
www.aaon.com
Two Condenser Head Pressure II Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A ENABLE INPUT
BIN 1
REV. VLV. ENABLE INPUT
BIN 2
COND. B ENABLE INPUT
BIN 3
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102110-A
Rev.: 1A
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
AAON No.:
V20660
GND
PWM1PWM1+
PWM2PWM2+
GND
AO1
AO2
GND
R1
R2
R3
R4
RC
+24 VAC
Zone
TABLE OF CONTENTS
OVERVIEW ....................................................................................................................................... 3
Overview .................................................................................................................................................................. 3
Features ................................................................................................................................................................... 3
INSTALLATION AND WIRING .......................................................................................................... 4
Environmental Requirements ...................................................................................................................................4
Mounting .................................................................................................................................................................. 4
Power Supply ........................................................................................................................................................... 4
Important Wiring Considerations .............................................................................................................................. 4
Stand-Alone Wiring ..................................................................................................................................................5
Condenser Type Selection ....................................................................................................................................... 5
E-BUS Controller to Two Condenser Head Pressure II Module Wiring ...................................................................6
SEQUENCE OF OPERATION ............................................................................................................ 8
Inputs and Outputs ...................................................................................................................................................8
Stand-Alone Input Commands ................................................................................................................................ 8
Input Commands (VCM-X Connection) ................................................................................................................... 9
Modes of Operation ................................................................................................................................................. 9
TROUBLESHOOTING ..................................................................................................................... 12
Head Pressure Module Valve/Fan Position Troubleshooting ................................................................................. 12
Troubleshooting for Stand Alone Mode .................................................................................................................. 13
Pressure Transducer Troubleshooting .................................................................................................................. 14
Using LEDs to Verify Operation .............................................................................................................................14
LED Diagnostics .................................................................................................................................................... 15
Other Checks .........................................................................................................................................................15
Zone
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION ORION AAON
TULSA
Two Condenser Head Pressure II Module - Tulsa OE370-23-HP2C2 V20660 N/A
Two Condenser Head Pressure II Module - Coil OE370-23-HP2C2-C N/A 31426
VCM-X Modular E-BUS Controller - Tulsa OE332-23E-VCMX-MOD-A V07150 N/A
VCM-X Modular E-BUS Controller - Coil OE332-23E-VCMX-MOD-C N/A 30553
VCM-X WSHP E-BUS Controller - Tulsa OE332-23E-VCMX-WSHP-A V07140 N/A
VCM-X WSHP E-BUS Controller - Coil OE332-23E-VCMX-WSHP-C N/A 30526
SA E-BUS Controller - Tulsa OE332-23E-SA-A V07160 N/A
SA Expansion Module - Tulsa OE333-23-SA-A R96180 N/A
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 April 2015 WattMaster Controls, Inc.
AAON Manual Part Number: V22100
AAON® is a registered trademark of AAON, Inc., Tulsa, OK.
WattMaster Form : AA-HP2C2-TGD-01E
Neither WattMaster Controls, Inc. nor AAON
assumes any responsibility for errors or omissions in this
document.
This document is subject to change without notice.
®
AAON
COIL
INSTALLATION & WIRING
Module Overview
Overview
The Two Condenser Head Pressure II Module (OE370-23-HP2C2)
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 II Module is designed to work
stand-alone by using its OPTIONS dip switch to adjust the Head Pressure setpoint.
The Two Condenser Head Pressure II Module is directly connected to
the VCM-X Modular E-BUS, VCM-X WSHP E-BUS or SA E-BUS
Controller, allowing the Module(s) to receive setpoints from the Controller. See chart on page 2 for part numbers.
When using the Two Condenser Head Pressure II Module with the RNE
Controller, refer to the RNE Controller Technical Guide.
The Two Condenser Head Pressure II Module also provides a pulse
width modulation (PWM) signal or voltage output signal to control the
condenser fans.
The Two Condenser Head Pressure II Module requires a 24 VAC power
connection with an appropriate VA rating.
Features
The Two Condenser Head Pressure II 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 E-BUS, VCM-X WSHP E-BUS, or SA 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 II 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
Two Condenser Head Pressure II Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A ENABLE INPUT
BIN 1
REV. VLV. ENABLE INPUT
BIN 2
COND. B ENABLE INPUT
BIN 3
COM
COMMON
WattMaster Label
E-BUS
Connector
#LB102110-A
Rev.: 1A
Figure 1: Two Condenser Head Pressure II Module
COND. A ENABLE
REV. VLV. AENABLE
COND. B ENABLE
REV. VLV. B ENABLE
MAX @ 24 VAC
RATING IS 1 AMP
RELAY CONTACT
RELAY COMMON
2C2Orion No.:OE370-23-HP
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
E-BUS
Connector
AAON No.:
V20660
GND
PWM2PWM2+
ALARM
AO1
AO2
GND
PWM1PWM1+
GND
R1
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
R1
R2
R3
R4
Rc
RELAYS
ANALOG
OPTIONS
ALARM
STAT
COMM
R2
R3
R4
RC
+24 VAC
Two Condenser Head Pressure II Module Technical Guide
3
INSTALLATION & WIRING
Mounting and Wiring Considerations
Zone
Zone
Environmental Requirements
The Two Condenser Head Pressure II 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 II 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.
Important Wiring Considerations
Please read carefully and apply the following information when wiring
the Two Condenser Head Pressure II Module:
1. To operate the Two Condenser Head Pressure II 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 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. 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.
5.71
5.64
5.04
ADDRESS
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
www.aaon.com
Two Condenser Head Pressure II Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. A ENABLE INPUT
BIN 1
REV. VLV. ENABLE INPUT
BIN 2
COND. B ENABLE INPUT
BIN 3
COM
COMMON
WattMaster Label
E-BUS
#LB102110-A
Connector
Rev.: 1A
REV. VLV. AENABLE
REV. VLV. B ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
2C2Orion No.:OE370-23-HP
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
2.07
COND. A ENABLE
COND. B ENABLE
RELAY COMMON
AAON No.:
COND. A SIGNAL
COND. B SIGNAL
GND
COND. FAN A
COND. FAN A
COND. FAN B
COND. FAN B
LED BLINK CODES
V20660
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
AO1
AO2
0.29
R1
R1
R2
R2
R3
R3
R4
R4
RC
Rc
RELAYS
ANALOG
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
OPTIONS
+24 VAC
ALARM
STAT
COMM
0.55
4.14
Figure 2: Two Condenser Head Pressure II Module Dimensions
4
Two Condenser Head Pressure II Module Technical Guide
INSTALLATION & WIRING
Stand-Alone Wiring
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.
OE370-23-HP2C2
Two Condenser Head Pressure II 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 A ON/OFF
REVERSING VALVE A/B ON/OFF
CONDENSER B ON/OFF
COM
Set ADDRESS Dip Switch 1 to ON
for Water Cooled or to OFF for Air
Cooled. Currently showing OFF for
Air Cooled.
ADDRESS Dip Switch 2 is not used
in this application..
Set ADDRESS Dip Switch 3 to ON
to disable Circuit B alarms when
only one Condenser is Used.
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.
ADDRESS
PWR
BIN 1
BIN 2
BIN 3
COM
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
www.aaon.com
Two Condenser Head Pressure II Module
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
COND. AENABLE INPUT
BIN 1
REV. VLV. ENABLE INPUT
BIN 2
COND. B ENABLE INPUT
BIN 3
COM
COMMON
E-BUS
Connector
A1
HEAD
PRESSURE
TRANSDUCER #1
A2
HEAD
PRESSURE
TRANSDUCER #2
B1
HEAD
PRESSURE
TRANSDUCER #3
B2
HEAD
PRESSURE
TRANSDUCER #4
WattMaster Label
#LB102110-A
Rev.: 1A
Stand-Alone Wiring
To operate the Two Condenser Head Pressure II Module as Stand Alone,
connect the Module to a 24 VAC connection with an appropriate VA
rating. See Figure 3 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.
Condenser Type Selection
As shown in Figure 3, set ADDRESS Dip Switch 1 to ON for water
cooled or to OFF for air cooled. Refer to page 8 for further instructions.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
- 1 AMP MAXIMUM LOAD
ONLY
AAON No.:
V20660
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
AO1
AO2
GND
R1
R2
R3
R4
RC
+24 VAC
24 VAC
COND. AENABLE
REV. VLV. AENABLE
COND. B ENABLE
REV. VLV. B ENABLE
MAX @ 24 VAC
RATING IS 1AMP
RELAY CONTACT
RELAY COMMON
2C2Orion No.:OE370-23-HP
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
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.
R1
R2
R3
R4
Rc
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
RELAYS
ANALOG
COMM
OPTIONS
ALARM
STAT
COMM
24 VAC Transformer
3 VA Minimum
R1
R2
R3
R4
YELLOW
BLUE +24 OUT
YELLOW
BLUE +24 OUT
HVAC UNIT CONNECTION
CONDENSER A ENABLE
REVERSING VALVE A ENABLE
CONDENSER B ENABLE
REVERSING VALVE B ENABLE
Condenser
Condenser
+
COM
Condenser Fan A
ECM Motor
Duty Cycle
+24 Volts
Condenser Fan B
ECM Motor
Duty Cycle
+24 Volts
OPTIONS Dip Switch is
Used for Setting the Head
Pressure Setpoint if Not
Using Default Setpoint.
Line Voltage
Signal A
+
COM
Signal B
Figure 3: Two Condenser Head Pressure II Module Wiring Diagram (Stand-Alone)
Two Condenser Head Pressure II Module Technical Guide
5
Zone
INSTALLATION & WIRING
Zone
E-BUS Controller to Two Condenser Head Pressure II Module Wiring
VCM-X Modular E-BUS, VCM-X WSHP
E-BUS or SA E-BUS Controller to Two
Condenser Head Pressure II Module
Wiring
Up to (2) Two Condenser Head Pressure II Modules can be daisy-chained
together and connected to the E-BUS Controller using a modular HSSC
cable. The Two Condenser Head Pressure II Module requires a 24 VAC
power connection with an appropriate VA rating. See Figure 4 below
for wiring.
NOTE:
ALL RELAY OUTPUTS
NORMALLY OPEN AND
ARE
RATED FOR 24 VAC POWER
ONLY - 1 AMP MAXIMUM LOAD
OE370-23-HP2C2
www.aaon.com
Two Condenser Head Pressure II Module
A1
+5V
HEAD
SIG 1
PRESSURE
GND
TRANSDUCER #1
A2
+5V
HEAD
SIG 2
PRESSURE
GND
TRANSDUCER #2
B1
+5V
HEAD
SIG 3
PRESSURE
GND
TRANSDUCER #3
B2
+5V
HEAD
SIG 4
PRESSURE
GND
TRANSDUCER #4
COND. AENABLE INPUT
BIN 1
REV. VLV. ENABLE INPUT
BIN 2
COND. B ENABLE INPUT
BIN 3
COM
COMMON
WattMaster Label
E-BUS
#LB102110-A
Connector
Rev.: 1A
REV. VLV. A ENABLE
REV. VLV. B ENABLE
MAX @ 24 VAC
RATINGIS 1 AMP
RELAYCONTACT
2C2Orion 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
COND. AENABLE
COND. B ENABLE
RELAYCOMMON
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.
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 3 to ON to
disable Circuit B alarms when only one
Condenser is Used. Currently showing
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.
OFF.
.
SIG
GND
SIG
GND
SIG
GND
SIG
GND
Two Condenser Head Pressure II Module
+V
+V
+V
+V
ADDRESS
PWR
+5V
SIG 1
GND
+5V
SIG 2
GND
+5V
SIG 3
GND
+5V
SIG 4
GND
BIN 1
BIN 2
BIN 3
COM
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.
HVAC UNIT CONNECTION
CONDENSER A ENABLE
REVERSING VALVE A ENABLE
CONDENSER B ENABLE
REVERSING VALVE B ENABLE
Condenser
Signal A
+
COM
Condenser
Signal B
+
COM
Condenser Fan A
ECM Motor
Duty Cycle
+24 Volts
Condenser Fan B
ECM Motor
Duty Cycle
+24 Volts
AAON No.:
V20660
GND
GND
PWM1PWM1+
PWM2PWM2+
ALARM
GND
R1
R2
R3
R4
RC
AO1
AO2
GND
AO1
AO2
GND
PWM1-
PWM1+
PWM2-
PWM2+
+24 VAC
24 VAC
R1
R2
R3
R4
Rc
RELAYS
ANALOG
OPTIONS
ALARM
STAT
COMM
24 VAC Transformer
R1
R2
R3
R4
COMM
YELLOW
BLUE +24 OUT
YELLOW
BLUE +24 OUT
OPTIONS Dip Switch Setting Not Required
When Connected To
VCM-X E-BUS Controller
Line Voltage
3 VA Minimum
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-to-GND and 24
VAC-to-24 VAC.
Failure to observe polarity could result in
damage to the boards.
HSSC Cable
HSSC Cable
Connect To VCM-X E-BUS
Controller or SA E-BUS Controller
Figure 4: VCM-X E-BUS Controller to Two Condenser Head Pressure II Module Wiring Diagram
6
Two Condenser Head Pressure II Module Technical Guide
INSTALLATION & WIRING
E-BUS Controller to Two Condenser Head Pressure II 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
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
OE332-23E-VCMX-MOD-
VCM-X Modular
E-BUS Controller
RS-485 COMMUNICATION LOOP. WIRE
“R” TO “R”, “T”TO “T” “SHLD” TO “SHLD”
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)
A02
= SUPPLYFAN VFD (0-10 VDC OUTPUT)
E-BUS
CONNECTOR
ANALOG INPUT
JUMPER
SETTINGS
THERM
LED NAME STATUS1 STATUS2
4-20mA
AI1
0-10V
NORMALOPERATION 0 1
0-5V
SATFAIL 1 2
THERM
OATFAIL 2 2
4-20mA
AI2
SPCFAIL 3 2
0-10V
0-5V
MODULEALARM 4 2
THERM
MECHCOOL FA IL 1 3
4-20mA
AI3
MECHHEAT FAIL 2 3
0-10V
0-5V
FANPROOF FAIL 3 3
THERM
DIRTYFILTER 4 3
4-20mA
AI4
EMERGENCYSHUTDOWN 5 3
0-10V
0-5V
LOWSAT 1 4
THERM
HIGHSAT 2 4
4-20mA
AI5
CONT.TEMP COOL FAIL 3 4
0-10V
CONT.TEMP HEAT FAIL 4 4
0-5V
PUSHBUTTON OVR 1 5
THERM
4-20mA
ZONEOVR 2 5
AI7
0-10V
OUTPUTFORCE ACTIVE 0 6
0-5V
ANALOG INPUTJUMPER SETTINGS
MUSTBE SET AS SHOWN FOR
PROPER OPERATION
WattMasterLabel
STATIC
#LB102073-01-A
PRESSURE
Rev.: 1A
EXPANSION
RELAYCONTACT
RATING IS 1AMP
MAX @ 24 VAC
RELAY
COMMON
RELAY2
RELAY3
RELAY4
RELAY5
LED BLINKCODES
24 VAC POWER ONLY
WARNING!POLARITY MUST BE OBSERVED
OR THE CONTROLLER WILLBE DAMAGED
2
IC
FAN
AAON No.:
V07150
2
IC DIGITAL
SENSOR
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 - 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 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
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
Expansion Module(s)
(When Used)
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.
Figure 4, cont.: VCM-X E-BUS Controller to Two Condenser Head Pressure Module II Wiring Diagram
Two Condenser Head Pressure II Module Technical Guide
7
SEQUENCE OF OPERATION
Stand-Alone Input Commands
Zone
Zone
General
The following inputs and outputs are available on the Two Condenser
Head Pressure II Module. See Table 1 below to reference the Input/
Output Map.
Binary Inputs
1 Condenser Fan A On/Off (24 VAC Wet Input)
2 Reversing Valve On/Off (24 VAC Wet Input)
3 Condenser Fan B On/Off (24 VAC Wet Input)
Binary Outputs
Condenser A Enable Relay
1
(Dry Contact Output Rated for 24 VAC)
Reversing Valve A Enable
2
(Dry Contact Output Rated for 24 VAC)
Condenser B Enable Relay
3
(Dry Contact Output Rated for 24 VAC)
Reversing Valve B 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 Inputs
1 ECM 142 PWM Input (0-100% Duty Cycle)
2 ECM 142 PWM Input (0-100% Duty Cycle)
Table 1: Two Condenser Head Pressure II Module
Inputs & Outputs
Stand-Alone Input Commands
Condenser Fan A On/Off
A 24 volt signal to Binary Input #1 initiates the Condenser Fan A Enable
function. Typically, the source for this signal is the “Y” call from the
thermostat calling for a compressor to run.
Reversing Valve On/Off
A 24 volt signal to Binary Input #2 indicates the reversing valve has
been energized and initiates the Reversing Valve Enable On indication
function. Typically, the source for this signal is the “O” call from a
thermostat or other controller.
Condenser Fan B On/Off
A 24 volt signal to Binary Input #3 initiates the Condenser Fan B Enable
function. Typically, the source for this signal is the “Y” call from the
thermostat calling for a compressor to run.
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. 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.
If set to ON for a Water 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.
8
You must cycle power after setting Dip Switch values. See Figure
3 or 4 for ADDRESS Dip Switch location and Table 3 for Setting
information.
Two Condenser Head Pressure II Module Technical Guide
SEQUENCE OF OPERATION
VCM-X Input Commands and Modes of Operation
Input Commands (VCM-X Connection)
Condenser A & B On/Off
Instead of a hard wired input signal to the Condenser Enable input,
the VCM-X Modular Controller, VCM-X WSHP Controller, or SA
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.
Reversing Valve Enable A & B On/Off
As with the Condenser Signal On/Off function, the VCM-X Modular
Controller, VCM-X WSHP Controller, or SA Controller communicates
to the Module via E-BUS communications and signals that the reversing
valve has been energized and that heating 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 or SA
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 or SA 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 (2) 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 Signals are “OFF.” In this mode, all relays are off, the
Analog Output is 0 VDC, and the PWM Output is 0% Duty Cycle.
Cooling Mode
If the Head Pressure Controller has been confi gured for the Reversing
Valve to be energized in the Cooling Mode and to Fail to the Heat Mode
(Dipswitch 4 is set ON), then the Head Pressure Controller will be in
the Cooling Mode when one or both of the Condenser Signal inputs is
“ON” and the Reversing Valve Enable Signal is “ON”. In this circumstance, the Reversing Valve Enable Relay Output(s) will energize for
indication purposes.
If the Head Pressure Controller has been confi gured for the Reversing
Valve to be energized in the Heating Mode and to Fail to the Cool Mode
(Dipswitch 4 is set OFF), then the Head Pressure Controller will be in
the Cooling Mode when one or both of the Condenser Signal inputs is
“ON” and the Reversing Valve Enable Signal is “OFF”.
The Condenser Enable Relays will energize to enable the Condenser
Fans or Water Valves. In a water system, the Water Flow Valve will
start at 75% for 3 minutes. 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.
Heating Mode
If the Head Pressure Controller has been confi gured for the Reversing
Valve to be energized in the Cooling Mode and to Fail to the Heat Mode
(Dipswitch 4 is set ON), then the Head Pressure Controller will be in
the Heating Mode when one or both of the Condenser Signal inputs is
“ON” and the Reversing Valve Enable Signal is “OFF”.
If the Head Pressure Controller has been confi gured for the Reversing
Valve to be energized in the Heating Mode and to Fail to the Cool Mode
(Dipswitch 4 is set OFF), then the Head Pressure Controller will be in
the Cooling Mode when one or both of the Condenser Signal inputs is
“ON” and the Reversing Valve Enable Signal is “ON”. In this circumstance, the Reversing Valve Enable Relay Output(s) will energize for
indication purposes.
In this mode, the Condenser Output Signals will go to 100% and remain
there until it leaves the Heating Mode.
NOTE: The Reversing Valve Dipswitch 4 setting determines
whether the Reversing Valve Dipswitch 4 Relay is ON
to Heat / OFF to Cool or ON to Cool / OFF to Heat.
NOTE: The Reversing Valve Enable outputs are for indication
only and are not wired to anything.
Two Condenser Head Pressure II Module Technical Guide
9
SEQUENCE OF OPERATION
OPTIONS Dip Switch Settings
Zone
Zone
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
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 1 Settings
Switch 1 Default SP Description of Default Head Pressure Setpoint
OFF 340 Air Cooled Condenser using R410-A Refrigerant
ON 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 1 Condenser Type Settings
10
Two Condenser Head Pressure II Module Technical Guide
SEQUENCE OF OPERATION
OPTIONS Dip Switch Settings
ADDRESS Dip Switch 2 Settings
Switch 2 Description
Set to OFF if Using only (1) Head Pressure Module
OFF
ON
Table 4: ADDRESS Dip Switch 2 Address Settings When in Communicating Mode
or if this is Module 1 when Using (2) Head Pressure
Modules.
Set to ON if this is Module 2 when Using (2) Head
Pressure Modules.
ADDRESS Dip Switch 3 Settings
Switch 3 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 4 Description
OFF Reversing Valve On to Heat/ Off to Cool
ON Reversing Valve On to Cool/ Off to Heat
Table 6: ADDRESS Dip Switch 4 Settings for Reversing Valve
Two Condenser Head Pressure II Module Technical Guide
11
Zone
TROUBLESHOOTING
Zone
Head Pressure Module Valve / Fan Position 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 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 volt. (10%)
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 100% for 3 minutes
and then will modulate to try to maintain head pressure
setpoint.
For heating, fan will run and stay at 100%.
Safeties:
If the head pressure signal is above 500 PSIG, fan will go to
100% (high pressure safety).
If the head pressure signal is below 1 PSIG, fan will go to
100% (assuming bad sensor).
If the head pressure rises 50 PSI above setpoint, the condenser
signal will go to 100%.
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)
12
Two Condenser Head Pressure II Module Technical Guide
TROUBLESHOOTING
Troubleshooting for Stand-Alone Mode
Troubleshooting for Stand-Alone Mode
If you suspect or encounter general problems during operation of the
Two Condenser Head Pressure II Module while in Stand Alone Mode,
follow the Troubleshooting Flowchart in Figure 5 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
Is
“ERROR”
LED Blinking
Yes
?
Call WattMaster
Technical
Support
100%
No
Yes
?
Yes
Yes
Heat
Inputs
Active
BIN 2
Are
Enable
A& B
High
Blinks
2
Is
“ERROR”
LED Blinking
Note: “STAT” LED
will blink the # of
Good sensors
connected
“STAT”
Yes
?
blinking correct
Check wiring
on all sensors
No
Is
# of
Sensors
No
?
LED
?
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
500 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 5: Two Condenser Head Pressure II Module Troubleshooting Diagram
Two Condenser Head Pressure II Module Technical Guide
13
Zone
TROUBLESHOOTING
Zone
Pressure Transducer Troubleshooting and LEDs
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
Using LEDs to Verify Operation
The Two Condenser Head Pressure II 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 6 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 or SA 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 or SA 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
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 Table 9 below for Status Blink Code descriptions.
The blink code descriptions are also located on the Module’s front cover.
Alarm
Table 7: Two Condenser Head Pressure II Module
Transducer Chart
14
Two Condenser Head Pressure II Module Technical Guide
No. of
Blinks
Random Blinks Quantity of Sensors
Installed
Status
Table 9: STAT LED Blink Codes
TROUBLESHOOTING
LED Diagnostics
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 Reversing Valve A Enable Relay
is enabled and will stay lit as long as the Reversing Valve 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 Reversing Valve B Enable Relay
is enabled and will stay lit as long as the Reversing Valve B is active.
LED Diagnostics
“PWR” LED: When the Two Condenser Head Pressure II 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 or SA 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 II 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 or SA 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 or SA series controller is confi gured for Head
Pressure Control and is powered up. If after making all these checks,
the COMM LED does not light up, the board is probably defective.
“STAT” LED: As previously described, when the module is fi rst pow-
ered up, the STAT LED will b
“ALARM” LED: As previously described, this LED will blink on and
off to indicate alarms and diagnostics.
link out the number of installed sensors
Figure 6: LED Locations
Other Checks
NOTE: The Two Condenser Head Pressure II Module contains
no user-serviceable parts. Contact qualifi ed technical
personnel if your module is not operating correctly.
Two Condenser Head Pressure II Module Technical Guide
15
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AAON® Manual Part No.: V22100
WattMaster Manual Form No: AA-HP2C2-TGD-01E
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