Lennox HP29 Series

Page 11
DEFROST CONTROL BOARD HP29−2 UNITS
FIGURE 10
24V TERMINAL
STRIP
CONNECTIONS
DIAGNOSTIC
LEDs
PRESSURE SWITCH
SAFETY CIRCUIT CONNECTIONS
DEFROST
INTERVAL
TIMING PINS
AMBIENT
THERMISTOR
CONNECTION
NOTE− There is an internal jumper between inside PS1 and PS2 terminals.
SERVICE LIGHT
CONNECTION
LED
2
COMPRESSOR
CONNECTIONS
REVERSING VALVE
DEFROST SWITCH
CONNECTIONS
DEFROST CONTROL BOARD HP29−3 UNITS
FIGURE 11
90
test
60 30
timing
jumper
timing pins
(seconds)
pressure
switches
service
lights
ambient
thermistor
connection
24V
terminal
strip
diagnostic
LEDs