Lennox XPG20, Руководство по установке

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Page 32
506238−01 06/09
P2
24V TERMINAL STRIP CONNECTIONS
DS1 and
DS2
PRESSURE
SWITCH
CIRCUIT
CONNECTIONS
NOTE Component locations may vary by board manufacturer.
P4
REVERSING
VALVE
P5
P3
DCB
DEFROST CONTROL BOARD
100135−05 (LENNOX CAT#
42W04)
See Table 11 for LED diagnostic codes.
DIAGNOSTIC LEDS
P6
P1
DEFROST
TERMINATION
PIN SETTINGS
TEST PINS
W1
L
C
R
Y2
O
Y1
Table 9. DCB Jumper and Terminal Descriptions
ID Description
O OUT 24 VAC output connection for reversing valve.
LO−PS Connection for low−pressure switch
Y2
24 VAC output for second stage compressor sole-
noid.
Y1
24 VAC common output, switched for enabling
compressor contactor.
HS−PS Connection for high−pressure switch.
P1
50
70
90
100
Seven position square pin header. Provides
selection of the defrost terminate temperature
based on the position of the selection jumper. The
defrost termination temperature is measured by
the defrost coil sensor. The jumper termination pin
is factory set at 50°F (10°C). If the temperature
jumper is not installed, the default termination tem-
perature is 90°F (32°C). In addition, it provides
selection points for enabling the field test mode.
P2
W1
24VAC input/output from indoor thermostat to in-
door unit.
C 24VAC system common
L Thermostat service light connection.
R 24VAC system power input
Y2
24VAC thermostat input for second stage
operation of the unit.
O
24VAC thermostat input for reversing valve
operation
Y1
24VAC thermostat input for first−stage
compressor operation
P3
55
50
45
40
Five position square pin header. If the first−stage
compressor output is active in heating mode and
the outdoor ambient temperature is below the
selected compressor lock−in temperature, the
second−stage compressor solenoid outputs will
be energized without the Y2 input. If the jumper is
not connect to one of the temperature selections
on P3, the default lock−in temperature of 40ºF will
be used.
P4
Six position square pin header. P4 provides connections for the
temperature sensors.
COIL
(BROWN)
(PIN 1) Ground connection for outdoor coil
temperature sensor.
(PIN 2) Connection for outdoor coil temperature
sensor.
AMB
(BLACK)
(P4−3) Ground connection for outdoor ambient
temperature sensor.
(P4−4) Connection for outdoor ambient
temperature sensor.
DIS
(YELLOW)
(P4−5) Ground connection for outdoor coil
temperature sensor.
(P4−6) Connection for outdoor coil temperature
sensor.
P5
Two position square pin header. A field−selectable
function to reduce occasional sounds that may
occur while the unit is cycling in and out of the
defrost mode. When a jumper is installed on the
DELAY (P5) pins, the compressor will be cycled
off for 30 seconds going in and out of the defrost
mode. Units are shipped with jumper installed on
DELAY pins.
NOTE The 30 second off cycle is NOT
functional when jumpering the TEST pins.
P6
Eight position header. P6 provides connections
for the factory test.