PRECISIONAIR WS PRODUCT INFORMATION MANUAL
9
OPERATIONS AND CONTROLLER
HEAT PUMP DEFROST CONTROL
BOARD
Heat Pumps are equipped with a universal
heat pump defrost controller to ensure proper
operation including low ambient conditions.
The menu can be accessed by pressing the “o”
button. The up and down buttons are used
to adjust the value of each setting. Factory
settings applicable to the WSHP are shown in
the table below.
DISPLAY
DESCRIPTION
WSHP SETTING
1
Defrost Enable Temp
35F
2
Termination Temp
70F
3
Defrost Cycle Time*
30 min
4
Short Cycle Delay
0 min
5
Reversing Valve Type**
B
6
Reverse Delay
30 sec
7
Maximum Defrost Time
14 min
8
Aux Heat Lockout Temp
No lockout (OF)
9
Compressor Lockout Temp
No lockout (OF)
* Time the coil temperature is below Defrost Enable
Temperature before a defrost trigger.
** Valve energized in heat
COMPRESSOR SHORT CYCLE
PROTECTION
Single phase units are equipped with an
Emerson SureSwitch contactor. Short Cycle and
Brown Out protection reduces stress on the
compressor promoting long life. By default, the
contactor is set with the “Delay” and “Brown”
to “ON”. The short cycle protection ensures that
there are at least 3 minutes of off time for the
compressor. An LED indicates operation of the
SureSwitch.
SURESWITCH LED
CONDITION
SLOW GREEN
Standby
SOLID GREEN
Normal
FAST GREEN
Delay
GREEN / RED
Low Line Voltage
GREEN / YELLOW / RED
Test
Three phase units are equipped with a Littlefuse
Protection Relay that disables the system
during a fault condition including Reverse
Phase, Missing Phase, Voltage Imbalance, Low
Voltage and High Voltage. This reduces stress
on the compressor promoting long life. An LED
indicates operation of the 3 Phase Protection
Relay.
3 PHASE LED
CONDITION
SOLID GREEN
Normal
FLASHING GREEN
Delay
STEADY FLASHING RED
Reverse Phase
TWO FLASHING RED
Unbalance / Single Phase
SOLID RED
High / Low Voltage
FAN MOTOR TIME DELAY
Both indoor and outdoor fan motors are
equipped with a forced on time delay to help
with pressure balancing. This will keep both fan
motors running for approximately 1 minute after
the compressor shuts down.
DRAINAGE
The air conditioner is provided with a
condensate drain attached to a 90 degree
elbow. This elbow can be pulled out from
the bottom of the unit for connection to a
hose to route condensate away from the unit.
The condensate drain should be periodically
inspected for blockage as part of the
maintenance program.
