AAON RSMVQ User Manual

21RSMVQ Technical Guide
LCD SCREENS
Alarm History Screens
MODBUS TIMEOUT: Indicates there is no communication
between the RSMVQ and Compressor VFD.
DANFOSS VFD: Indicates an alarm on the Danfoss VFD.
HI DISCH LINETEMP: If discharge line temperature is above
260ºF, the compressor will back o. If the temperature doesn’t
drop below 260ºF after one minute, the compressor will turn o.
Discharge line temperature needs to drop below 150ºF for the
compressor to come back after it has been o for at least ve
minutes. If this occurs three times in two hours, the compressor
will be locked out until the module is reset.
UNIT CFG MISMATCH: Indicates that either the wrong
compressor model or unit tonnage is congured.
Alarm History Screens
The ALARM HISTORY Screen displays past alarms, if any, and
how long ago the last of each type occurred. From the ALARM
HISTORY Screen, press <ENTER> to scroll through the history
screens.
The Alarm will appear on the rst line and the second line will
display how long ago each alarm last occurred. The alarms listed
on the ALARMS screen will be abbreviated as shown below.
CL TMP 1—Coil Temp 1 Failure
CL TMP 2—Coil Temp 2 Failure
COMP 1 FL—Compressor 1 Not Running
COMP 2 FL—Compressor 2 Not Running
HP SENSE—No Head Pressure 1 Sensor Detected
HIGH HP—High Head Pressure Detected
LOW SP—Low Suction Pressure Detected
LOW SH1—Low Superheat 1 Detected
LOW SH2—Low Superheat 2 Detected
COMM T/O—E-BUS Slave Timeout
SP SENSE—No Suction Pressure Sensor Detected
UNSAFESP—Unsafe Suction Pressure Detected
LOH2OTMP—Low Leaving H
2
O Temp
NOH2OFLO—Proof of Water Flow
HI SH1—High Superheat 1 Failure
HI SH2—High Superheat 2 Failure
MODBUS—MODBUS Not Detected
DF VFD—Danfoss VFD Not Detected
HI DT—High Discharge Temperature Detected
HP2 SENSE—No Head Pressure 2 Sensor Detected
ALARM
HISTORY
NOTE: The screen will display minutes for the rst 60
minutes of alarm occurrence, hours for the next
72 hours of alarm occurrence, and days for the
next 30 days of alarm occurrence. After 30 days,
the alarm will clear. Alarm history is not stored
in memory. If power is lost, the alarms will clear.

AAON RSMVQ Specifications

General

Brand	AAON
Model	RSMVQ
Category	Control Unit
Language	English