Diagnostics
88
RTAF-SVX001K-EN
Low Evaporator Rfgt Temp Circuit 1: Unit
Off
Low Evaporator Rfgt Temp Ckt 1: Unit Off
Low Evap Rfgt Temp: Unit Off
Chiller
Special
Action
NonLatch
Unit in Stop
Mode, or in
Auto Mode and
No Ckt's
Energzd [Any
Ckt Energzd]
The respective circuit’s LERTC Integral was
seen to be > 0 while the chiller is in the
Stop mode, or in Auto mode with no
compressors running for at least one
minute. The LERTC integral is increased if
the Evap Refrigerant Pool Temp is below
the value of the Low Evap Rfgt Temp
2°F. Energize Evap Water Pump
and Off-Cycle Freeze Avoidance Request
Relay until diagnostic auto resets, then
return to normal evap pump control and
de-energize the Freeze Avoidance
Request. Automatic reset occurs when the
respective Evap Rfgt Pool Temp rises 4°F
(1.1°C) above the LERTC cutout setting
for 1 minute and the Chiller Off LERTC
Integral = 0. This diagnostic even while
active, does not prevent operation of
either circuit.
Remote
Low Evaporator Rfgt Temp Circuit 2: Unit
Off
Low Evaporator Rfgt Temp Ckt 2: Unit Off
Low Evap Rfgt Temp: Unit Off
Chiller
Special
Action
NonLatch
Unit in Stop
Mode, or in
Auto Mode and
No Ckt's
Energzd [Any
Ckt Energzd]
The respective circuit’s LERTC Integral was
seen to be > 0 while the chiller is in the
Stop mode, or in Auto mode with no
compressors running for at least one
minute. The LERTC integral is increased if
the Evap Refrigerant Pool Temp is below
the value of the Low Evap Rfgt Temp
2°F. Energize Evap Water Pump
and Off-Cycle Freeze Avoidance Request
Relay until diagnostic auto resets, then
return to normal evap pump control and
de-energize the Freeze Avoidance
Request. Automatic reset occurs when the
respective Evap Rfgt Pool Temp rises 4°F
(1.1°C) above the LERTC cutout setting
for 1 minute and the Chiller Off LERTC
Integral = 0. This diagnostic even while
active, does not prevent operation of
either circuit.
Remote
Low Evaporator Water Temp (Unit Off)
Low Evap Water Temp-Unit Off
Chiller
Special
Action
NonLatch
Unit in Stop
Mode, or in
Auto Mode and
No Ckt(s)
Energzd [Any
Ckt Energzd]
Either the entering or leaving evaporator
water temp. fell below the leaving water
temp cutout setting for 30 degree F
seconds while the Chiller is in the Stop
mode, or in Auto mode with no
compressors running. Energize Freeze
Avoidance Request Relay and Evap Water
Pump Relay until diagnostic auto resets,
then de-energize the Freeze Avoidance
Request Relay and return to normal evap
pump control. Automatic reset occurs
when both temps rise 2°F (1.1°C) above
the cutout setting for 5 minutes, or either
circuit starts. This diagnostic even while
active, does not prevent operation of
either circuit.
Remote
Low Evaporator Water Temp (Unit On)
Low Evap Water Temp-Unit On
Chiller
Immediate
and Special
Action
NonLatch
Any Ckt[s]
Energzd [No
Ckt(s)
Energzd]
The evaporator entering or leaving water
temperature fell below cutout setpoint for
30 degree F Seconds while the compressor
was running. Automatic reset occurs when
both of the temperature rises 2°F (1.1°C)
above the cutout setting for 2 minutes.
This diagnostic shall not de-energize the
Evaporator Water Pump Output.
Remote
Table 33. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target
Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level