Installation and Maintenance Manual

Diagnostics
204 RLC-SVX09H-EN
Low Evaporator
Refrigerant
Temperature - Circuit 2
Circuit Immediate Latch
All Ckt Running
Modes
The inferred Saturated Evap Refrigerant
Temperature (calculated from suction pressure
transducer dropped below the Low Refrigerant
Temperature Cutout Setpoint for 1125?F-sec
(25?F-sec max rate) while the circuit was
running. The minimum LRTC setpoint is -5?F
(18.7 Psia) the point at which oil separates from
the refrigerant. During the time that the trip
integral is non zero, the unload solenoid(s) of
the running compressors on the circuit, shall be
energized continuously and the load solenoid
shall be off. Normal load (unload operation will
be resumed if the trip integral decays to zero by
temps above the cutout setpoint. The integral
is held nonvolatily though power down, is
continuously calculated, and can decay during
the circuit’s off cycle as conditions warrant.
Remote
Low Evaporator Temp –
Ckt 1: Unit Off
Evap Pump Special Action Non Latch
Unit in Stop Mode,
or in Auto Mode and
No Ckt's Energzd
[Any Ckt Energzd]
The respective evap sat temp fell below the
water temp cutout setting while the evap liquid
level was greater than –36 mm for 150º-sec
degree F seconds while Chiller is in the Stop
mode, or in Auto mode with no compressors
running. Energize small Evap Circulating Pump
(RTUD A (C) and Evap Water pump Relay (but
only if “Evap Water Pump Diagnostic Override”
setting is enabled) until diagnostic auto resets,
then de-energize the circ pump and return to
normal evap pump control. Automatic reset
occurs when the derived evap sat temp rises
2?F (1.1?C) above the cutout setting for 1
minute or the liquid level is below –36.0 mm for
20 minutes, or any compressor restarts. OA
temp is substituted for evap sat temp in case of
invalidity. This diagnostic even while active,
does not prevent operation of either circuit.
Remote
Low Evaporator Temp –
Ckt 2: Unit Off
Evap (and
circ) Pump
Special Action Non Latch
Unit in Stop Mode,
or in Auto Mode and
No Ckts Energzd
[Any Ckt Energzd]
The respective evap sat temp fell below the
water temp cutout setting while the evap liquid
level was greater than –36 mm for 150º-sec
degree F seconds while Chiller is in the Stop
mode, or in Auto mode with no compressors
running. Energize small Evap Circulating Pump
(RTUD A (C) and Evap Water pump Relay (but
only if “Evap Water Pump Diagnostic Override”
setting is enabled) until diagnostic auto resets,
then de-energize the circ pump and return to
normal evap pump control. Automatic reset
occurs when the derived evap sat temp rises
2?F (1.1?C) above the cutout setting for 1
minute or the liquid level is below –36.0 mm for
20 minutes, or any compressor restarts. OA
temp is substituted for evap sat temp in case of
invalidity. This diagnostic even while active,
does not prevent operation of either circuit.
Remote
Low Evaporator Water
Temp: Unit Off
Evap Pump Special Action Non Latch
Unit in Stop Mode,
or in Auto Mode and
No Ckt(s) Energzd
[Any Ckt Energzd]
The 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 small Evap Circulating Pump
(RTUD A (C) and Evap Water pump Relay (but
only if “Evap Water Pump Diagnostic Override”
setting is enabled) until diagnostic auto resets,
then de-energize the circ pump and return to
normal evap pump control. Automatic reset
occurs when the temp rises 2?F (1.1?C) above
the cutout setting for 30 minutes. This
diagnostic even while active, does not prevent
operation of either circuit.
Remote
Table 134. Main Processor Diagnostics (continued)
Diagnostic Name
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level