19
RSMD Technical Guide
LCD SCREENS
Alarms Screens
COMPRESSOR (COMP) 1 or 2 LOCKOUT:
If active cutoff
occurs five times within a four-hour period, the compressor will
be locked out. Must cycle power to RSMD to clear the alarm.
• If a circuit’s Suction Pressure falls below the Low
Suction Pressure Setpoint for longer than one minute
twice within a two hour window, 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 five seconds, that circuit’s compressor
will locked out. Power will need to be cycled to restart
the unit.
•
If the Leaving Water Temperature falls below setpoint,
the last compressor will be locked out until the Leaving
Water Temperature rises 6ºF above setpoint.
• The Leaving Water Temperature remains below setpoint
for one minute or falls 3ºF below setpoint. This alarm
will disable when the leaving water temperature rises
12ºF above the setpoint.
NO PROOF OF H2O FLOW:
There is a call for a compressor
and there is no Proof of Flow Input Enable for more than three
minutes or if during Heat Pump heating, the Proof of Flow Enable
is open for more than two seconds. This alarm will disable when
Proof of Flow is enabled.
LOW H2O TEMPERATURE:
If both compressors are on and
water temp goes below setpoint, Compressor 2 will fail. If both
compressors are on and water temp goes 3ºF below setpoint, both
compressors will fail. If Compressor 2 is off or failed and water
temp 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 off.
COMPRESSOR 1 FALSE ACTIVE INPUT:
If the compressor
relay is off but the compressor binary active input is activated
for 60 seconds, it will cause an alarm.
COMPRESSOR 1 FALSE ACTIVE INPUT:
If the compressor
relay is off but the compressor binary active 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 five minutes.
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