Lennox Elite Series Installation Instructions Manual page 14

the unit will terminate defrost and return to heat mode. The
TEST mode will then be locked­out and no further TEST
mode operation will be executed until the jumper on the
TEST pins is removed and re­applied to the applicable de­
frost termination pins.
IMPORTANT
NOTE - After testing has been completed, properly re­
position test jumper across desired timing pins.
Service Light Connection
The defrost control includes terminal connections for a ser­
vice light which provides a signal that activates the room
thermostat service light during periods of inefficient opera­
tion.
Start-Up and Performance Checklist
Customer
Indoor Unit Model
Outdoor Unit Model
Notes:
START UP CHECKS
Refrigerant Type:
Rated Load Amps:
Condenser Fan Full Load Amps
COOLING MODE
Suction Pressure:
Supply Air Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required
subcooling and approach temperatures.)
Subcooling:
Approach:
Indoor Coil Temperature Drop (18 to 22°F)
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 automatically resets at 418 + 15
psig.
Actual Amps
Actual Amps:
Liquid Pressure:
Ambient Temperature:
Saturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Liquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Return Air Temperature (A)
minus Supply Air Temperature (B)
Page 14
Defrost Control Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition.
DEFROST CONTROL (CMC1) DIAGNOSTIC LEDS
Mode Green LED (DS2)
No power to con­
OFF
trol
Normal operation /
Simultaneous Slow FLASH
power to control
Anti‐short cycle
Alternating Slow FLASH
lockout
High pressure Slow FLASH
switch fault
High pressure ON
switch lockout
Address
Serial
Serial
Rated Volts
Return Air: Temperature:
A —
A —
A —
TABLE 2
Red LED (DS1)
OFF
OFF
OFF
Actual Volts
B = SUBCOOLING
B = APPROACH
B = COIL TEMP DROP