Safety Devices and the UPM Controller | 18Greensource CDi Series TW Model
8733954853 (2020/04)Greensource CDi Series TW Model
Subject to change without prior notice
• TEST DIP SWITCH: A test dip switch is
provided to reduce all time delays settings to
10 seconds during troubleshooting or
verification of unit operation.
• FREEZE SENSOR: The default setting for the
freeze limit trip is 26°F (sensor number 1);
however, this can be changed to 15°F by
cutting the R24 resistor located on top of the
DIP switch SW1. Since Freeze Sensor 2 is
dedicated to monitor the load side coil it is
recommended to leave the factory default
setting on the board. The UPM controller will
constantly monitor the refrigerant temperature
with the sensor mounted close to the
condensing water coil between the thermal
expansion valve and water coil. If temperature
drops below or remains at the freeze-limit trip
for 30 seconds, the controller will shut the
compressor down and enter into a soft-lockout
condition. Both the status LED and the Alarm
contact will be active. The LED will flash (3
times) the code associated with this alarm
condition. If this alarm occurs 2 times (or 4 if
Dip switch is set to 4) within an hour the UPM
controller will enter into a hard-lockout
condition. It will constantly monitor the
refrigerant temperature with the sensor
mounted close to the evaporator between the
thermal expansion valve and evaporator coil as
shown in Fig. 10. If temperature drops below
or remains at the freeze limit trip for 30
seconds, the controller will shut the
compressor down and enter into a soft-lockout
condition. Both the status LED and the Alarm
contact will be active. The LED will flash 6
times the code associated with this alarm
condition. If this alarm occurs 2 times (or 4 if
Dip switch is set to 4) within an hour the
controller will enter into a hard-lockout
condition.
• INTELLIGENT RESET: If a fault condition is
initiated, the 5-minute delay on break time
period is initiated and the unit will restart after
these delays expire. During this period the
fault LED will indicate the cause of the fault. If
the fault condition still exists or occurs 2 or 4
times (depending on 2 or 4 setting for Lockout
dip switch) before 60 minutes, the unit will go
into a hard lockout and requires a manual
lockout reset.
• LOCKOUT RESET: A hard lockout can be reset
by turning the unit thermostat off and then
back on when the “RESET” dip switch is set to
“Y” or by shutting off unit power at the circuit
breaker when the “RESET” dip switch is set to
“R.”
If 24 VAC output is needed, R must be wired
to ALR-COM terminal; 24 VAC will be
available to the ALR-OUT terminal when the
unit is in the alarm condition.
NOTICE: Operation of unit in test mode can
lead to accelerated wear and premature
failure of components. The "TEST" switch
must be set back to "NO" after
troubleshooting/servicing.
NOTICE: The freeze sensor will not guard
against the loss of water. A flow switch is
recommended to prevent unit from running
if water flow is lost or reduced.
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