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Unit Controls - UPM
SV Heat PumpSeries
SV Heat Pump Series
8 733 914 818 (2014?08)
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 R30
resistor located on top of the DIP switch SW1.
The
default setting for the freeze limit trip is 26°F
(sensor number 2); 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
evaporator 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 (three (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
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 Figure #12. 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 (three
(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. A single condensate overflow
fault will cause the unit to go into a hard
lockout immediately, and will require 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”.
NOTE:
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.
It is recommended to have a flow switch to
prevent the unit from running if water flow is lost.
The blower motor will remain active during a
lockout condition. ECM Interface Board
Thermostat Connections
