Lennox XP14-018-230 Installation Instructions Manual page 15

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.
DEFROST CONTROL (CMC1) DIAGNOSTIC LEDS
Mode
No power to con­
trol
Normal operation /
power to control
Anti‐short cycle
lockout
High pressure
switch fault
High pressure
switch lockout
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
Before attempting to perform any service or mainte­
nance, turn the electrical power to unit OFF at discon­
nect switch.
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).
Page 15
TABLE 3
Green LED (DS2) Red LED (DS1)
OFF OFF
Simultaneous Slow FLASH
Alternating Slow FLASH
Slow FLASH OFF
ON OFF
CAUTION
WARNING
XP14 SERIES