20
RSMD-CM Technical Guide
LCD SCREENS
Alarms Screens
COMPRESSOR 2 (COMP2) FAULT (if not in tandem): If the
relay energizes but the binary input never energizes, this alarm
occurs if the compressor fails to run 45 seconds after the relay is
activated. This causes an alarm and de-energizes the compressor
enable (relay). The system will retry after ve minutes.
COMPRESSOR 1 (COMP1) BAD TEMPERATURE: This alarm
will occur if the Discharge Temperature Sensor 1 measures less
than -40ºF or more than 356ºF. This causes an alarm and de-
energizes the compressor enable (relay).
COMPRESSOR 2 (COMP2) BAD TEMPERATURE: This alarm
will occur if the Discharge Temperature Sensor 2 measures less
than -40ºF or more than 356ºF. This causes an alarm and de-
energizes the compressor enable (relay). The system will retry
after ve minutes.
COMPRESSOR 1 (COMP1) CUTOFF: This alarm will occur if
the Discharge Temperature Sensor 1 measures more than 265ºF.
This causes an alarm and de-energizes the compressor enable
(relay). The system will can be restarted after 30 minutes.
COMPRESSOR 2 (COMP2) CUTOFF: This alarm will occur if
the Discharge Temperature Sensor 2 measures more than 265ºF.
This will cause an alarm and will shut down the compressor
(relay). The system will can be restarted after 30 minutes.
COMPRESSOR (COMP) 1 or 2 LOCKOUT: If active cuto
occurs ve times within a four-hour period, the compressor will
be locked out. Power must be cycled and the compressor restarted
to clear the alarm.
• If a circuit’s Suction Pressure twice within a two-hour
window falls below the Low Suction Pressure Setpoint
for longer than one minute, the compressor on that
circuit will be locked out. Manual reset or change of
mode is required to return to normal operation.
• If the Suction Pressure falls below the Unsafe Suction
Setpoint for ve seconds, that circuit’s compressor will
be locked out. Power will need to be cycled to restart
the unit.
• If the Leaving Water Temperature falls below the
setpoint, the last compressor will be locked out until the
Leaving Water Temperature rises 6ºF above setpoint.
• The Leaving Water Temperature remains below the
setpoint for one minute or falls 3ºF below the setpoint.
This alarm will disable when the Leaving Water
Temperature rises 12ºF above the setpoint.
NO PROOF OF WATER FLOW: This alarm occurs when there
is a call for a compressor and the Proof of Flow input is o for
more than three minutes or, if during Heat Pump heating mode,
the Proof of Flow input is open for more than two seconds. This
alarm will disable when the Proof of Flow is enabled.
LOW WATER TEMPERATURE: If both compressors are on and
water temperature goes below the setpoint, Compressor 2 will
fail. If both compressors are on and water temperature goes 3ºF
below the setpoint, both compressors will fail. If Compressor 2
is o or failed and water temperature is still low for one minute,
the Compressor 1 will also fail. This alarm will disable when the
leaving water temperature rises 6ºF above the setpoint.
EMERGENCY SHUTDOWN: If the Emergency Shutdown binary
input is not activated, the compressors will shut o.
COMPRESSOR 1 FALSE ACTIVE INPUT: If the compressor
relay is o but the compressor status binary input is activated
for 60 seconds, it will cause an alarm.
COMPRESSOR 2 FALSE ACTIVE INPUT: If the compressor
relay is o but the compressor status binary input is activated
for 60 seconds, it will cause an alarm.
WSHP HEATING OUT OF ENVELOPE FAULT: If the circuit
is running below the envelope consecutively for one minute,
the compressor(s) on the circuit will fail and an alarm will be
generated. The system will retry after ve minutes.
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