Page 15
XP14 SERIES
Compressor Delay (P5)
The defrost control has a field-selectable function to re
duce occasional sounds that may occur while the unit is
cycling in and out of the defrost mode.
The compressor will be cycled off for 30 seconds going in
and out of the defrost mode when the compressor delay
jumper is installed.
NOTE -
The 30‐second compressor feature is ignored
when jumpering the TEST pins.
Time Delay
The timed‐off delay is five minutes long. The delay helps
to protect the compressor from short‐cycling in case the
power to the unit is interrupted or a pressure switch
opens. The delay is bypassed by placing the timer select
jumper across the TEST pins for 0.5 seconds.
Test Mode
The
TEST
mode is activated by removing the jumper on
the defrost termination pins (
30
,
60
or
90
) and placing the
jumper on the
TEST
pins after 24VAC is applied to the
control. The low pressure input is ignored in
TEST
mode.
IMPORTANT
The TEST pins are ignored and the TEST function is
locked out:
S
If the jumper is applied on the TEST pin before
24VAC is applied to the control.
S
If there is a jumper on the 30 or 60 minute defrost
termination pins.
Bypass Anti-Short-Cycle Delay
The
Y1
input must be active
ON
, the high pressure switch
must be closed or a jumper must be installed on the high
pressure terminals of the control.
Initiate a Force Defrost
The
Y1
input must be active
ON
, the high pressure switch
must be closed or a jumper must be installed on the high
pressure terminals of the control, the defrost thermostat
must be closed or a jumper must be placed across the
DF
terminals on the control and the
O
terminals must not
have 24VAC (no power to reversing valve) before control
will enter into a force defrost.
Test Mode Sequence
Using the defrost termination pin, short the
TEST
pins for
a period of two seconds:
S
Clear timed lockout / or pressure switch lockout func
tion.
S
Enter defrost mode.
After entering force defrost, if the jumper is removed be
fore 5 seconds has elapsed, the unit will remain in forced
defrost mode until defrost thermostat opens or termin
ated on maximum defrost time (14 minutes). If the jumper
is not removed, once 5 seconds has elapsed (7 seconds
total), the unit will terminate defrost and return to heat
mode. The
TEST
mode will then be lockedout and no fur
ther
TEST
mode operation will be executed until the
jumper on the
TEST
pins is removed and reapplied to the
applicable defrost termination pins.
IMPORTANT
After testing has been completed, properly reposition test
jumper across desired timing pins.
Service Light Connection
The defrost control includes terminal connections for a
service light which provides a signal that activates the
room thermostat service light during periods of inefficient
operation.
Defrost Control Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condi
tion.
TABLE 3
DEFROST CONTROL (CMC1) DIAGNOSTIC LEDS
Mode
Green LED (DS2)
Red LED (DS1)
No power to con
trol
OFF
OFF
Normal operation /
power to control
Simultaneous Slow FLASH
Anti‐short cycle
lockout
Alternating Slow FLASH
High pressure
switch fault
Slow FLASH
OFF
High pressure
switch lockout
ON
OFF
HIGH PRESSURE SWITCH (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed
pressure switch opens when liquid line pressure rises
above the factory setting of 590 + 15 psig and automati
cally resets at 418 + 15 psig.
Homeowners Information
CAUTION
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
In order to ensure peak performance, your system must
be properly maintained. Clogged filters and blocked air
flow prevent your unit from operating at its most efficient
level. The system should be inspected and serviced be
fore each cooling and heating season by a licensed pro
fessional HVAC service technician (or equivalent).
