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LV Heat Pump Series
•
TEST DIP SWITCH:
to reduce all time delays settings to 10 seconds
during troubleshooting or verification of unit
operation.
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.
•
FREEZE SENSOR:
The default setting for the
freeze limit trip is 30°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.
default setting for the freeze limit trip is 30°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
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 5. 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.
It is recommended to have a flow switch to
prevent the unit from running if water flow is lost.
LV Heat Pump Series
A test dip switch is provided
The
•
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".
The blower motor will remain active during a
lockout condition. ECM Interface Board
Thermostat Connections
OPTIONS
Extended Range Option
LV heat pumps are supplied standard with
capillary style expansion device tuned to typical
boiler/tower system operating conditions. For
applications that will experience more extreme
fluid flow rates or temperatures (heating fluid
temperatures below 50°F and/or cooling fluid
temperatures below 60°F or above 100°F), an
extended range option is required.
The extended range option on the LV consists of a
bi-flow, balanced port thermal expansion valve and
an insulated water-to-refrigerant heat exchanger.
With the extended range option installed LV units
can provide heating with fluid temperatures as low
as 25°F and as high as 80°F and cooling with fluid
temperatures as low as 45°F and as high as 120°F.
Unit Mounted Non-Fused Disconnect
Switch
LV heat pumps can be supplied with an optional
unit mounted disconnect switch mounted to the
electrical corner post of the unit.
Field electrical wiring is connected to the switch
and the switch then routes power to the heat
pump electrical box. When the switch is in the
"OFF" position, the heat pump electrical box is
completely de-energized.
Options | 17
8 733 905 683 (2013/04)
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