GPG16M Service Manual

SERVICING
55
High
Altitude
Kit 2000 3000 4000 4500 5000 6000 7000 8000
U.S. BURNER ORIFICE 46/1.25M M 46/1.25M M 47/56 -- 48/56 48/57 49/57 49/57
CANADA BURNER ORIFICE -- -- 48/56 -- -- -- --
INPUT/BURNER
20,000 BTUH NAT/18,000 BTUH/L.P.
ELEVATION ABOVE SEA-LEVEL (FEET)
HA-03
S-313 TESTING IGNITION CONTROL MODULE
NOTE: Failure to earth ground the unit, or a high resistance
connection in the ground may cause the control to lockout
due to failure to flame sense.
L2
INDUCER
LOW
HIGH
L1
ODF
LOW
HIGH
T1
Q3
K4
K3 K5
K6
T2
K7
FS
U1
U2
U6
U7
U4
U5
U3
P2
K2
K1
ECON
STAGE
DELAY
C9
SPEED UP
SW1
FAULT
RECALL
BLOWER
OFF
DELAY
F1
R C W1W2 G Y2
90
120
150
180
10MIN
5 MIN
NONE
PARK
1
2
3
4
5
Y1
PCBAG127 DSI Control Board
Testing Direct Spark Ignition (DSI) Systems
PGBAG127 Board
Heating Mode
Indoor thermostat calling for heat (15 second prepurge time
and 7 second trial for ignition).
1. Check for 230 volts from L1 terminal of control module to
L2. No voltage - check wire connections, continuity, etc.
2. Check for 24 volts at "R" to "C" thermostat terminals.
a. No voltage - check 3 amp automotive type fuse on
control board. A blown fuse could indicate a short
in the 24 volt circuit (thermostat or limit circuit).
b. Voltage Present - check limit and rollout (S-301
and S-302). If limit and rollout are closed, then
check for 24 VAC at the gas valve terminals.
c. No 24 VAC at gas valve - check 9 pin connector
and wires from ignition control to gas valve. If wires
and connections at 9 pin connector check good,
replace ignition control.
d. Voltage present at gas valve - replace gas valve.
Testing High Stage Heat Operation with Low Stage
Heat Operating:
1. Board set for 2 stage thermostat:
a. Check for 24 Volts at thermostat terminals W2 and
C on the control board.
b. No voltage - check thermostat and thermostat
wiring.
c. Voltage present - check for 24 volts at gas valve
terminals C and HI.
d. No voltage present at valve - check 9 pin connector
and wires from ignition control to gas valve. If wires
and connections at 9 pin connector check good,
replace ignition control.
e. Voltage present at gas valve - replace gas valve.
2. Board set for 1 stage thermostat:
a. Wait the selected delay time (either 5 or 10
minutes, depending on jumper setting).
b. Check for 24 volts at gas valve terminals C and HI.
c. No voltage present - check 9 pin connector and
wires from ignition control to gas valve. If wires and
connections at 9 pin connector check good, re-
place ignition control.
d. Voltage present at gas valve terminals C and HI -
replace valve.