3
Unitary Products Group
INSTRUCTIONS FOR DGPT STANDING PILOT MODELS
LIGHTING INSTRUCTIONS
1. STOP! Read the SAFETY IN
Ć
FORMATION.
2. Set the thermostat to the lowest
setting.
3. Turn off all electrical power to the
appliance.
4. Remove the furnace doors.
5. Push in the gas control lever
slightly and move right to “OFF”.
DO NOT FORCE.
6. Wait ten (10) minutes to clear out
any gas. Then smell for gas, in-
cluding near the floor. If you smell
gas, STOP! Follow “C” in the
SAFETY INFORMATION. If you
don’t smell gas, go to the next
step.
7. Open hinged observation door,
the pilot is found at the end of the
pilot shield on the left side of the
burner.
8. Slightly depress the gas control
lever and move it to the left to the
“ON” position and release; then
move it to the “PILOT” position.
9. Move the control lever to “SET”
and hold. Immediately light the pi-
lot with a match (use match hold-
er provided). Continue to hold the
control lever for about one (1)
minute after the pilot is lit. Re-
lease the lever and it will spring
back to the “PILOT”” position. Pi-
lot should remain lit. If it goes out,
repeat steps “5” through “9”
above.
D If the lever does not spring back
when released, stop and immedi-
ately call your service technician
or gas supplier.
D If the pilot will not stay lit after sev-
eral tries, move the gas control le-
ver to “OFF” and call your service
technician or gas supplier.
10. Move the gas control lever to
“ON”.
11. Replace the furnace doors.
12. Turn on all electric power to the
furnace. Set the thermostat to
“HEAT” and/or the desired tem-
perature setting. Set the ON--
OFF--FAN switch to “ON”.
In the event of any flashback or ex
Ć
plosion, immediately shut off the
furnace and call your service tech
Ć
nician.
To Turn off Gas to Appliance
1. Set the thermostat to the lowest
setting.
2. Turn off all electric power to the
appliance if service is to be per-
formed.
3. Remove the furnace doors.
4. Move gas control switch to “OFF”
position. DO NOT FORCE.
5. Replace the furnace doors.
GAS CONTROLCONTROL LEVER
FIGURE 1 -- ROBERT SHAW
GAS VALVE
S
S TT
E
E P
PIILLO
OTTO
ON
NO
OFFFF
P
IL
O
T
P
IL
O
T
A
D
J
A
D
J
11 22
+
+
PRESSURE REGULATING DEVICE
SEQUENCE OF OPERATION
1. On a call for heat, the thermostat
contacts close, supplying 24 VAC
to the gas valve.
2. When the gas valve is energized
it steps open at a reduced flow
and opens fully after approxi-
mately 10 seconds.
3. When the call for heat is satisfied
the thermostat contacts open,
the gas valve shut off gas flow.
THE FURNACE CONTROLS
AND THEIR FUNCTION
1. “ON--OFF--FAN” switch turns
electrical power to the furnace on
and off. The switch must be set in
the “ON” position for the furnace
to operate. To run the blower con-
tinuously without heating, set the
switch to “FAN”.
2. Limit Control -- This furnace is
protected by two (2) high temper-
ature limit switches. The lower
limit switch is an automatic reset
type.
The upper limit switch near left
side of blower is a manual reset
type limit switch (See Figure 2).
If burner does not function, turn
system switch to OFF and push
reset button in center of limit
switch.
Chute to left of blower is hot. Use
care when resetting limit switch
to avoid burns to hand and arm.
If the upper limit switch trips
again soon after resetting, turn
the furnace System Switch to
the OFF position and call your
nearest authorized service tech
Ć
nician.
FIGURE 2 -- FURNACE CONTROLS
BLOWER
SYSTEM
SWITCH
PILOT
ACCESS
DOOR
GAS VALVE
BURNER AIR
SHUTTER
ADJUSTMENT
ROD
AUTOMATIC
RESET LOWER
LIMIT SWITCH
HOT
HOT
UPPER LIMIT
SWITCH
(MANUAL
RESET)
3. Gas Valve -- The gas valve is
100% shut--off type and will fail
safe if for some reason the gas is
turned off or the pilot goes out. It
is also of the modulating or “step--
open” type which means they
open to a “low fire” position and
after a few seconds “step--open”
to “high fire”.
