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15
MANIFOLD/ORIFICE/BURNER REMOVAL
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit damage or
improper operation.
Label all wires prior to disconnection when servicing
controls.
CAUTION
!
D’EQUIPMENT D’OPERATION
Lors des opérations d’entretien des commandes, étiqueter
tous les fils avant de les déconnecter.
PRUDENCE
!
NOTE
: Use a back-up wrench on the gas valve to prevent the
valve from rotating on the manifold or damaging the mounting to
the burner box. See Fig. 19 and 20.
1. Disconnect the gas pipe from gas valve and remove pipe
from the furnace casing.
2. Disconnect the connector harness from gas valve. Discon-
nect wires from Hot Surface Igniter (HSI) and Flame
Sensor. Disconnect the two wires from the low gas pres-
sure switch (LGPS) located on the gas valve.
3. Support the manifold and remove the 4 screws that secure
the manifold assembly to the burner box and set aside.
4. Note the location of the green/yellow wire ground wire for
re-assembly later.
5. Slide one--piece burner assembly out of slots on sides of
burner box.
6. Remove the flame sensor from the burner assembly.
7. Remove the orifices from the manifold and discard.
Orifice
Connect Green/Yellow
ground wire here
Manifold
Gas Valve
Gas valve must be installed on
manifold with minimum engagement of
6 threads. Cross threading is not
acceptable.
Indicated surfaces
to be 90 ˚+ or -2˚
C
L
Gas valve is parallel to manifold
or - 3˚
A11407
Fig. 19 -- 2 Stage Gas Valve
FLAME SENSOR
(BELOW BURNER)
FLAME ROLLOUT
SWITCH
BRACKET, IGNITER
IGNITER
BURNER SUPT. ASSY
BURNER ASSY
A11403
Fig. 20 -- Burner Assembly
ORIFICE SELECTION/DERATE
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
DO NOT re--drill burner orifices. Improper drilling may
result in burrs, out--of--round holes, etc. Obtain new orifices
if orifice size must be changed. (See Fig. 21.)
CAUTION
!
BURNER
ORIFICE
BURNER
ORIFICE
A96249
Fig. 21 -- Burner Orifice
Determine natural gas orifice size and manifold pressures for
correct input at installed altitude by using Table 5.
1. Obtain yearly heat--value average (at installed altitude) for
local gas supply.
2. Obtain yearly specific--gravity average for local gas sup-
ply.
3. Find installation altitude in Table 5.
NOTE
: For Canada altitudes of 2000 to 4500 ft. (610 to 1372
M), use U.S.A. Altitudes of 2001 to 3000 ft. (610 to 914 M) in
Table 5.
4. Find closest natural gas heat value and specific gravity in
Table 5.
5. Follow heat--value line and specific--gravity line to point
of intersection to find orifice size and high and low mani-
fold pressure settings.