AAON ASM06690, ASM07681 Compressor Protection Module User Guide
- September 14, 2024
- AAON
Table of Contents
ASM06690, ASM07681 Compressor Protection Module
Specifications
- Product Name: Compressor Protection Module
- Part Number: ASM06690 / ASM07681
- Manufacturer: AAON
Product Information
The Compressor Protection Module supports up to two compressors.
It does not have staging or failover functionality; the compressors
operate independently.
Dimensions
ASM06690 Dimensions: 6.5″ x 4.0″ x 4.25″
ASM07681 Dimensions: 4.37″ x 4.0″
Installation and Wiring
The ASM07681 is equipped with new OMNIMATE connectors for easier
installation. Refer to the provided figures for wiring details.
Product Usage Instructions
Installation
-
Ensure power to the system is turned off before
installation. -
Locate a suitable mounting location for the Compressor
Protection Module. -
Secure the module in place using appropriate mounting
hardware.
Wiring
Follow the wiring diagram provided in the manual for proper
connection of the module to the compressors and power source.
FAQ
Q: Can the Compressor Protection Module handle more than two
compressors?
A: No, the module supports up to two compressors only.
Q: Is there a failover feature in case one compressor
fails?
A: No, each compressor operates independently within the
module.
Compressor Protection Module Technical Guide
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
GND 24VAC
REVISION AND DATE Rev. A, December 15, 2021 Rev. B, February 9, 2022 Rev. C, December 18, 2023 Rev. D, June 21, 2024 Rev. E, August 14, 2024
PRODUCT NAME REVISION LOG CHANGE
Original Added wiring for On/Off Compressors Added replacement part, wiring,
and LED descriptions, updated layout Updated Dimensions Updated Illustrations
PRODUCT NAME PARTS REFERENCE
PART DESCRIPTION Compressor Protection Module
ASM06690 / ASM07681
PART NUMBER
www.aaon.com
All manuals are also available for download from www.aaon.com/controlsmanuals.
AAON
2425 South Yukon Ave. Tulsa, OK 74107-2728 www.aaon.com
Factory Technical Support Phone:
918-382-6450 AAON Controls Support:
866-918-1100 It is the intent of AAON
to provide accurate and current product information. However, in the interest
of product improvement, AAON reserves the right to change pricing,
specifications, and/or design of its product without notice, obligation, or
liability.
AAON P/N:G100690, Rev. E © August 2024 AAON Inc. All rights reserved. AAON® is a registered trademark of AAON, Inc., Tulsa, OK. Copeland® is a registered trademark of Emerson Electric Co., St. Louis, MO. OMNIMATE® is a registered trademark of Weidmüller, Detmold, Klingenbergstraße, Germany AAON assumes no responsibility for errors or omissions in this document. This document is subject to change without notice.
Compressor Protection Module Technical Guide
2
TABLE OF CONTENTS
OVERVIEW ………………………………………………………………………………………………………………………………. 5 General
Information ……………………………………………………………………………………………………………………………… 5 Dimensions
…………………………………………………………………………………………………………………………………………. 6
INSTALLATION AND WIRING …………………………………………………………………………………………………… 7
Wiring…………………………………………………………………………………………………………………………………………………. 7 Inputs and
Outputs……………………………………………………………………………………………………………………………….. 8 Inputs and Outputs
Descriptions…………………………………………………………………………………………………………….. 9 ASM06690 – Single
Compressor ………………………………………………………………………………………………………….. 10 ASM06690 – Dual
Compressor ………………………………………………………………………………………………………………11 ASM06690 – Single
Digital Compressor ………………………………………………………………………………………………… 12 ASM06690 – Digital
and On/Off Compressor ………………………………………………………………………………………….. 13 ASM06690 – Dual
Digital Compressor …………………………………………………………………………………………………… 14 ASM07681 – Single
Compressor ………………………………………………………………………………………………………….. 15 ASM07681 – Dual
Compressor …………………………………………………………………………………………………………….. 16 ASM07681 – Single
Digital Compressor ………………………………………………………………………………………………… 17 ASM07681 – Digital
and On/Off Compressor ………………………………………………………………………………………….. 18 ASM07681 – Dual
Digital Compressors …………………………………………………………………………………………………. 19 OMNIMATE®
Connector – ASM07681 Only …………………………………………………………………………………………… 20
SEQUENCE OF OPERATIONS ……………………………………………………………………………………………….. 21 Operation
Modes ……………………………………………………………………………………………………………………………….. 21
TROUBLESHOOTING …………………………………………………………………………………………………………….. 23 Compressor
Protection Module LED Diagnostics……………………………………………………………………………………. 23
Compressor Protection Module LED Locations – ASM06690
……………………………………………………………………. 24 Compressor Protection Module LED Locations –
ASM07681 ……………………………………………………………………. 25
Compressor Protection Module Technical Guide
3
FIGURES AND TABLES
FIGURES
Figure 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15:
Compressor Protection Module Dimensions – ASM06690……………………………………………………………………….6 Compressor Protection Module Dimensions – ASM07681……………………………………………………………………….6 ASM06690 – Single Compressor……………………………………………………………………………………………………………10 ASM06690 – Dual Compressor …………………………………………………………………………………………………………….. 11 ASM06690 – Single Digital Compressor ………………………………………………………………………………………………..12 ASM06690 – Digital and On/Off Compressor …………………………………………………………………………………………13 ASM06690 – Dual Digital Compressors …………………………………………………………………………………………………14 ASM07681 – Single Compressor……………………………………………………………………………………………………………15 ASM07681 – Dual Compressor ……………………………………………………………………………………………………………..16 ASM07681 – Single Digital Compressor ………………………………………………………………………………………………..17 ASM07681 – Digital and On/Off Compressor …………………………………………………………………………………………18 ASM07681 – Dual Digital Compressors …………………………………………………………………………………………………19 OMNIMATE Connector Instructions……………………………………………………………………………………………………….20 LED Locations and Descriptions – ASM06690 ……………………………………………………………………………………….24 LED Locations and Descriptions – ASM07681 ……………………………………………………………………………………….25
Table 1: Table 2: Table 3: Table 4:
TABLES
Compressor Protection Module Specifications
……………………………………………………………………………………….7 Inputs and Outputs – ASM06690
……………………………………………………………………………………………………………..8 Inputs and Outputs – ASM07681
……………………………………………………………………………………………………………..8 Alarm Status LED Diagnostic
Codes……………………………………………………………………………………………………..23
Compressor Protection Module Technical Guide
4
OVERVIEW
General Information
Overview
The Compressor Protection Module is used in split systems as a stand-alone
module. It provides additional protection for compressors in systems with
self-resetting pressure switches. The module uses high pressure and low
pressure switches to disable the compressor and enforce a minimum compressor
off time when a fault occurs. It also limits the number of retries and locks
out the compressor if it exceeds the maximum number of allowed faults. The
Compressor Protection Module sequence is intended to help with the start up of
units with microchannel coils and prevent nuisance lockouts when the coil is
cold.
The Compressor Protection Module supports up to two compressors. There is no
staging or fail over functionality within the module; the compressors operate
independently.
The ASM07681 is equipped with new OMNIMATE connectors for easier installation.
See Figure 6, page 13.
Compressor Protection Module Technical Guide
5
OVERVIEW Dimensions
6.5
4.0
Note: All dimensions are in inches.
Figure 1: Compressor Protection Module Dimensions – ASM06690
4.25
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
ON/OFF
DIGITAL
LABEL P/N: G143890
4.37
ON ON
GND 24VAC
Note: All dimensions are in inches.
Figure 2: Compressor Protection Module Dimensions – ASM07681
Compressor Protection Module Technical Guide
6
INSTALLATION AND WIRING Wiring
Wiring Overview
Control Device Voltage VA Load Temperature Humidity (NonCondensing)
In general, most Compressor Protection Modules are installed and wired at the AAON factory. Some of the following information pertains to field wiring and may not apply to your installation if it was pre-wired at the factory. However, if troubleshooting of the module is required, it is a good idea to be familiar with the system wiring, no matter if it was factory or field wired.
Compressor Protection
Module
18-30 VAC
10
-4°F to 158°F 0% to 95%
RH
Mounting
Table 1: Compressor Protection Module Specifications
When the Compressor Protection Module is field mounted, it is important to mount it in a location that is free from extreme high or low temperatures, moisture, dust, and dirt. See Table 1, this page, for a list of the required operating conditions for the Compressor Protection Module.
The Compressor Protection Module is designed to be mounted via the four shoulder eyelets located on the corners of each circuit board.
CAUTION: Be careful not to damage the electronic components when mounting the module.
Electrical & Environmental Requirements
The Compressor Protection Module must be connected to a 24 VAC power source of
the proper size for the calculated VA load requirements. All transformer
sizing should be based on the VA rating listed in Table 1, this page.
Compressor Protection Module Technical Guide
7
INSTALLATION AND WIRING Inputs and Outputs
I/O Map
See Table 2 and 3, this page, for Compressor Protection Module inputs and
outputs.
ASM06690 -Compressor Protection Module
Inputs
Pluggable Screw Terminal Block H4
2
Compressor A call from the main controller (Y1)
3
Compressor B call from the main controller (Y2)
4
High pressure switch for Compressor A (HPS-A)
5
Low pressure switch for Compressor A (LPS-A)
6
High pressure switch for Compressor B (HPS-B)
7
Low pressure switch for Compressor B (LPS-B)
10
Compressor A output from Copeland Controller (M2-A)
11
Compressor B output from Copeland Controller (M2-B)
12
Compressor control relay ground
Quick Disconnect Terminals
P2-R
24 VAC
P3-COM Ground
Relays
Quick Disconnect Terminals
COMP1 Compressor A 24 VAC output
COMP2 Compressor B 24 VAC output
DE-A Compressor A demand enable
DE-B Compressor B demand enable
P21-COM Compressor A ground
P19-COM Compressor B ground
Table 2: Inputs and Outputs – ASM06690
BIN1
Compressor Protection Module Inputs
Compressor A call from the main controller (Y1)
BIN2
Compressor B call from the main controller (Y2)
BIN3
High pressure switch for Compressor A (HPS-A)
BIN4
Low pressure switch for Compressor A (LPS-A)
BIN5
High pressure switch for Compressor B (HPS-B)
BIN6
Low pressure switch for Compressor B (LPS-B)
BIN7
Compressor A output from Copeland Controller (M2-A)
BIN8
Compressor B output from Copeland Controller (M2-B)
RLY1A
Relays DE-A (Compressor A demand enable)
RLY1B RLY1 Common
RLY2A DE-B (Compressor B demand enable)
RLY2B RLY2 Common
RLY3 COMP1 (Compressor A output)
GND
GROUND
RLY4 COMP2 (Compressor B output)
GND
GROUND
Table 3: Inputs and Outputs – ASM07681
Compressor Protection Module Technical Guide
8
INSTALLATION AND WIRING Inputs and Outputs Descriptions
Compressor Protection Module I/Os
Compressor A call This is the Compressor A call from the main controller.
Compressor B call This is the Compressor B call from the main controller.
Compressor A Output This is the Compressor A 24 VAC output which energizes the
compressor contactor.
Compressor A Enable This is the Compressor A demand enable which energizes
external relay to pass the demand VDC signal to Copeland Controller.
High pressure switch
This is the high pressure switch or compressor run status for Compressor A.
Compressor B Output
This is the Compressor B 24 VAC output which energizes the compressor
contactor.
Low pressure switch This is the low pressure switch for Compressor A.
High pressure switch This is the high pressure switch or compressor run status
for compressor B.
Compressor B Enable
This is the Compressor B demand enable which energizes the external relay to
pass the demand VDC signal to the Copeland Controller.
Low pressure switch This is the low pressure switch for compressor B.
Compressor A output This is the Compressor A output from the Copeland Controller.
Compressor B output This is the Compressor B output from the Copeland Controller.
Compressor control relay ground (ASM06690 only) This is the ground connection for the compressor control relay..
P2-R 24 VAC input (ASM06690 only) This is the 24 VAC input for the Compressor Protection Module.
Compressor Protection Module Technical Guide
9
INSTALLATION AND WIRING ASM06690 – Single Compressor
CSTB1 COM
R
C-LPS-A
LVTB Y1
H4
1 2 3 4 5 6 7 8 9 10 11 12
DE-B COM
R COM
Compressor Protection Module
H1 H2
ASM06690
COM DE-A COM
COMP2 COM COMP1 COM
C-HPS-A
Figure 3: ASM06690 – Single Compressor
C-CCH-A
C-MTR-A CONTACTOR
C-MTR-A
Compressor Protection Module Technical Guide
10
INSTALLATION AND WIRING ASM06690 – Dual Compressor
CSTB1 COM
R
C-LPS-A C-LPS-B
LVTB
Y1 Y2
H4
1 2 3 4 5 6 7 8 9 10 11 12
DE-B COM
R COM
Compressor Protection Module
H1 H2
ASM06690
COM DE-A COM
COMP2 COM COMP1 COM
C-HPS-A
C-HPS-B
C-CCH-B
C-MTR-B C-MTR-B CONTACTOR
C-CCH-A
C-MTR-A C-MTR-A CONTACTOR
Figure 4: ASM06690 – Dual Compressor
Compressor Protection Module Technical Guide
11
INSTALLATION AND WIRING ASM06690 – Single Digital Compressor
CSTB1 COM
R
C-LPS-A
LVTB Y1
COMP-A CMD
C-HPS-A
H4
1 2 3 4 5 6 7 8 9 10 11 12
DE-B COM
R COM
Compressor Protection Module
H1 H2
ASM06690
COMP2 COM COMP1 COM
COM DE-A COM
LVTB
+ SP1+ SP1-
1.45 TO 5 VDC DEMAND SIGNAL
0 TO 5 VDC SUCTION PRESSURE
C-SPT-A
C-CCH-A
C-THERM-A
C-MTR-A CONTACTOR
C-MTR-A
COPLAND COMP A
24COM V2
24VAC V1
C1
U2
C2
U1
C3
M2
C4
M1
P1
L2
P2
L1
P3
A1
P4
A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
Figure 5: ASM06690 – Single Digital Compressor
Compressor Protection Module Technical Guide
12
INSTALLATION AND WIRING ASM06690 – Digital and On/Off Compressor
CSTB1 COM
R
C-LPS-A C-LPS-B
LVTB
Y1 Y2
COMP-A CMD
C-HPS-A
H4
1 2 3 4 5 6 7 8 9 10 11 12
DE-B COM
R COM
Compressor Protection Module
H1 H2
ASM06690
COM DE-A COM
COMP2 COM COMP1 COM
C-HPS-B
C-CCH-B
LVTB
+ SP1+ SP1-
1.45 TO 5 VDC DEMAND SIGNAL
0 TO 5 VDC SUCTION
PRESSURE
C-SPT-A
C-MTR-B C-MTR-B CONTACTOR
C-CCH-A
C-THERM-A
C-MTR-A C-MTR-A CONTACTOR
COPLAND COMP A
24COM V2
24VAC V1
C1
U2
C2
U1
C3
M2
C4
M1
P1
L2
P2
L1
P3
A1
P4
A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
Figure 6: ASM06690 – Digital and On/Off Compressor
Compressor Protection Module Technical Guide
13
INSTALLATION AND WIRING ASM06690 – Dual Digital Compressor
CSTB1 COM
R
C-LPS-A C-LPS-B
LVTB
Y1 Y2
COMP-A CMD
COMP-B CMD
1.45 TO 5 VDC DEMAND SIGNAL
0 TO 5 VDC SUCTION
PRESSURE
LVTB
+ SP1+ SP1-
C-HPS-A
H4
1 2 3 4 5 6 7 8 9 10 11 12
DE-B COM
R COM
Compressor Protection Module
H1 H2
ASM06690
COM DE-A COM
COMP2 COM COMP1 COM
C-HPS-B
C-CCH-B
LVTB
+ SP1+ SP1-
1.45 TO 5 VDC DEMAND SIGNAL
0 TO 5 VDC SUCTION
PRESSURE
C-SPT-A
C-MTR-B C-MTR-B CONTACTOR
C-CCH-A
C-THERM-A
C-MTR-A CONTACTOR
C-MTR-A
COPLAND COMP A
24COM V2
24VAC V1
C1
U2
C2
U1
C3
M2
C4
M1
P1
L2
P2
L1
P3
A1
P4
A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
C-SPT-B C-THERM-B
COPLAND COMP B
24COM V2
24VAC V1
C1
U2
C2
U1
C3
M2
C4
M1
P1
L2
P2
L1
P3
A1
P4
A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-B UNLOADER
Figure 7: ASM06690 – Dual Digital Compressors
Compressor Protection Module Technical Guide
14
INSTALLATION AND WIRING ASM07681 – Single Compressor
LVTB Y1
C-LPS-A
CSTB1 COM
R
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
GND 24VAC
Figure 8: ASM07681 – Single Compressor
C-HPS-A
C-CCH-A C-MTR-A
C-MTR-A CONTACTOR
Compressor Protection Module Technical Guide
15
INSTALLATION AND WIRING ASM07681 – Dual Compressor
LVTB Y1 Y2
C-LPS-A
C-LPS-B
CSTB1 COM
R
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 DE-A
Y2
HPS-A DE-B
LPS-A
HPS-B COMP1
LPS-B
GND
M2-A COMP2
M2-B
GND
LABEL P/N: G143890
GND 24VAC
C-HPS-B
C-CCH-B
C-HPS-A
C-MTR-B C-MTR-B CONTACTOR
Figure 9: ASM07681 – Dual Compressor
C-CCH-A C-MTR-A
C-MTR-A CONTACTOR
Compressor Protection Module Technical Guide
16
INSTALLATION AND WIRING ASM07681 – Single Digital Compressor
1.45 TO 5 VDC DEMAND SIGNAL 0 TO 5 VDC SUCTION PRESSURE
LVTB Y1 Y2
C-LPS-A C-LPS-B
COMP-A-CMD
CSTB1 COM
R
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
+ SP1+ SP1-
LVTB
C-SPT-A C-THERM-A
COPLAND COMP A
24COM V2
24VAC V1
C1 U2
C2 U1
C3 M2
C4 M1
P1
L2
P2
L1
P3 A1
P4 A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
GND 24VAC
C-HPS-A
C-CCH-A C-MTR-A
C-MTR-A CONTACTOR
Figure 10: ASM07681 – Single Digital Compressor
Compressor Protection Module Technical Guide
17
INSTALLATION AND WIRING ASM07681 – Digital and On/Off Compressor
1.45 TO 5 VDC DEMAND SIGNAL 0 TO 5 VDC SUCTION PRESSURE
LVTB Y1 Y2
C-LPS-A C-LPS-B
COMP-A-CMD
CSTB1 COM
R
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
+ SP1+ SP1-
LVTB
C-SPT-A C-THERM-A
COPLAND COMP A
24COM V2
24VAC V1
C1 U2
C2 U1
C3 M2
C4 M1
P1
L2
P2
L1
P3 A1
P4 A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
GND 24VAC
C-HPS-B
C-CCH-B
C-HPS-A
C-MTR-B C-MTR-B CONTACTOR
C-CCH-A C-MTR-A
C-MTR-A CONTACTOR
Figure 11: ASM07681 – Digital and On/Off Compressor
Compressor Protection Module Technical Guide
18
INSTALLATION AND WIRING ASM07681 – Dual Digital Compressors
1.45 TO 5 VDC DEMAND SIGNAL 0 TO 5 VDC SUCTION PRESSURE
LVTB Y1 Y2
C-LPS-A C-LPS-B
COMP-A-CMD
COMP-B-CMD
CSTB1 COM
R
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
LVTB
GND 24VAC
C-HPS-B
C-CCH-B
C-HPS-A
C-MTR-B C-MTR-B CONTACTOR
C-CCH-A C-MTR-A
C-MTR-A CONTACTOR
Figure 12: ASM07681 – Dual Digital Compressors
+ SP1+ SP1-
+ SP1+ SP1-
1.45 TO 5 VDC DEMAND SIGNAL 0 TO 5 VDC SUCTION PRESSURE
C-SPT-A C-THERM-A
COPLAND COMP A
24COM V2
24VAC V1
C1 U2
C2 U1
C3 M2
C4 M1
P1
L2
P2
L1
P3 A1
P4 A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-A UNLOADER
LVTB C-SPT-B C-THERM-B
COPLAND COMP B
24COM V2
24VAC V1
C1
U2
C2
U1
C3
M2
C4
M1
P1
L2
P2
L1
P3
A1
P4
A2
P5
P6
T1
T2
T3
T4
T5
T6
COMP-B UNLOADER
Compressor Protection Module Technical Guide
19
INSTALLATION AND WIRING OMNIMATE® Connector – ASM07681 Only
Figure 13: OMNIMATE Connector Instructions
Release Button
Compressor Protection Module Technical Guide
20
SEQUENCE OF OPERATIONS Operation Modes
Compressor Operation
High Pressure Alarm Sequence
The compressor operation is determined by the compressor call from the main
controller and the compressor output from the Copeland Compressor Controller.
Sequence of Operation
Off When the compressor call is not energized, the compressor relay output and
demand enable will be de-energized.
Compressor Call Active When the compressor call and the low pressure switch
energize, the demand enable energizes, which allows the compressor demand
signal to pass from the main controller to the Copeland Controller.
NOTE: The compressor relay output will not energize if the low pressure switch
is not energized. This could indicate a loss of charge in the system.
If the high pressure switch is not energized within five seconds of the
compressor output from the Copeland Controller being active or if the high
pressure switch is de-energized while the compressor is running, a high
pressure alarm will be triggered.
If an alarm occurs on startup or within the first 15 minutes of the compressor
call, the module will allow four retries, and will lock out on the fifth
fault.
If a fault occurs after the first 15 minutes of the compressor call, the
module will allow one retry, and will lock out if another fault occurs within
two hours.
The alarm will de-energize the compressor 24 VAC and demand enable for two
minutes and then re-energize the demand enable. The low pressure switch and
high pressure switch will be ignored and not trigger an alarm until the
compressor output from the Copeland Controller has re-energized. The
compressor 24 VAC will energize once the compressor output from the Copeland
Controller is energized.
When the compressor output from the Copeland Controller is energized, the Compressor Protection Module will energize the compressor 24 VAC to energize the compressor output from the Copeland Controller. The low pressure switch and high pressure switch are ignored and will not trigger any alarms until the compressor output from the Copeland Controller is energized.
The fault counter will reset to zero if the compressor call is removed or the
compressor has run successfully for two hours since the last fault.
If the module is locked out, power to the module must be cycled to clear the
lockout.
NOTE: This is to prevent false alarms on the Compressor Protection Module when the Copeland Controller is in its own minimum off time.
If the compressor output from the Copeland Controller is deenergized while the
compressor call is still active, the Compressor Protection Module will de-
energize the compressor 24 VAC, but keep the demand enable energized. The
compressor 24 VAC will re-energize when the demand for the compressor rises
above 10%. The off time in this case is enforced by the Copeland Controller.
When the compressor call de-energizes, the compressor 24 VAC and demand enable
will de-energize and a minimum compressor off time of five minutes will be
enforced. If the compressor call becomes re-energized, the compressor will not
restart until the minimum off time has elapsed.
NOTE: There is no minimum on time enforced by the Compressor Protection
Module.
Compressor Protection Module Technical Guide
21
SEQUENCE OF OPERATIONS Operation Modes
Low Pressure Alarm Sequence
The Low Pressure Switch is ignored for one minute after the compressor
contactor output becomes active.
NOTE:
This alarm logic replaces a standalone timer-based low pressure switch bypass
that defaults to five minutes. However, this five minutes is the default for
the timer and has no relevance to the operation
of the unit.
If the low pressure switch is de-energized for five seconds while the
compressor is running, a low pressure alarm will be triggered and the
compressor 24 VAC and demand enable will be de-energized.
If the compressor call is still active, the demand enable will be re-energized
after five minutes. The low pressure switch and high pressure switch will be
ignored and not trigger an alarm until the compressor output from the Copeland
Controller has re-energized.
The compressor 24 VAC output will be energized once the compressor output from
the Copeland Controller is energized.
The compressor will be locked out if three low pressure alarms occur within
two hours.
If the compressor is locked out, power to the module must be cycled to clear
the lockout.
Compressor Protection Module Technical Guide
22
TROUBLESHOOTING Compressor Protection Module LED Diagnostics
Compressor Protection Module LEDs
See Figure 3, page 14, for LED locations. The LEDs and their uses are as
follows:
Operation LED POWER – This green LED will light up when 24 VAC power is
applied to the module. Output LEDs COMP A RELAY – This green LED will light up
when Compressor A Relay is active. COMP B RELAY – This green LED will light up
when Compressor B Relay is active. Demand Enable A – This green LED will light
up when the demand enable for Compressor A is active. Demand Enable B – This
green LED will light up when the demand enable for Compressor B is active.
COMP A and B Alarm Status
Blinks
Blink Code Description
0
No Alarms
1
High Pressure Alarms
2
High Pressure Lockout
3
Low Suction Alarm
4
Low Suction Lockout
Table 4: Alarm Status LED Diagnostic Codes
Controller Alarms
LED Fault Codes
The Compressor Protection Module has two status LEDs (D3 and D4) on the board
to indicate faults for Compressor A and B. A green status light indicates the
unit is powered up and that the module is not detecting any fault conditions.
A flashing red status light indicates the module has detected a fault
condition and is now in alarm mode. The number of flashes indicates what alarm
is present. See Table 3, this page, for blink code descriptions.
Lockout Alarms
The Compressor Protection Module has an Alarm LED on the board to indicate
when an alarm is present. This LED will light up red if there is an active
High Pressure Lockout or Low Suction Lockout alarm for either compressor.
Compressor Protection Module Technical Guide
23
TROUBLESHOOTING Compressor Protection Module LED Locations – ASM06690
Power LED
COMP A Status Indicator LED
COMP B Status Indicator LED
Demand Enable B LED
COMP B Relay LED
Lockout Alarms LED
Demand Enable A LED
COMP A Relay LED
Figure 14: LED Locations and Descriptions – ASM06690
Compressor Protection Module Technical Guide
24
TROUBLESHOOTING Compressor Protection Module LED Locations – ASM07681
Binary Input LEDs
www.aaon.com
COMPRESSOR PROTECTION MODULE AAON P/N: ASM07681
Y1 Y2 HPS-A LPS-A HPS-B LPS-B M2-A M2-B
DE-A
DE-B COMP1
GND COMP2
GND
LABEL P/N: G143890
GND 24VAC
Figure 15: LED Locations and Descriptions – ASM07681
Demand Enable A LED COMP A Relay LED Demand Enable B LED COMP B Relay LED COMP A Status Indicator LED COMP B Status Indicator LED Lockout Alarms LED Power LED
Compressor Protection Module Technical Guide
25
Compressor Protection Module Technical Guide G100690 Rev. E 240814
AAON Controls Support: 866-918-1100
Monday through Friday, 7:00 AM to 5:00 PM
Central Standard Time Controls Support website:
www.aaon.com/controlstechsupport AAON Factory Technical Support:
918-382-6450
techsupport@aaon.com NOTE: Before calling Technical Support, please have the
model and serial number of the unit available. PARTS: For replacement parts,
please contact your local
AAON Representative.
2425 South Yukon Ave · Tulsa, OK · 74107-2728 Ph:
918-583-2266 · Fax:
918-583-6094 AAON P/N: G100690, Rev. E
Printed in the USA · Copyright August 2024 · All Rights Reserved
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