International comfort products NAHB00101MH Installation Instructions Manual page 4

WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than one disconnect
switch. Lock out and tag switch with a suitable warning label.
Verify proper operation after servicing.
Furnace Support for Servicing Air
Figure 2
Conditioner
FURNACE
FIELD-SUPPLIED
SUPPORTS
(1 X 4 (25 X 102 mm)
OR 2 X 4 (51 X 102 mm)
3 PLACES)
Figure 3 Manifold Assembly
Orifice
Manifold
Connect Green/Yellow
ground wire here
Gas Valve
Gas valve is parallel to manifold
C L
within + or - 3˚
Gas valve must be installed on
manifold with minimum engagement of
6 threads. Cross threading is not
acceptable.
4
Figure 4
ON/OFF SWITCH
1. Set room thermostat to lowest setting or OFF.
2. Disconnect power at external disconnect, fuse or circuit
3. Turn off gas at external shut−off or gas meter.
4. Remove outer doors and set aside.
5. Turn electric switch on gas valve to OFF.
6. Disconnect the gas pipe from gas valve and remove pipe
7. Disconnect the connector harness from gas valve
8. Support the manifold and remove the four (4) screws that
9. Note the location of the green/yellow wire ground wire for
A99007
10. Remove production gas valve from manifold assembly
NOTE: Production gas valve has a slotted cap on regulator
adjustment cap. The convertible valve has cap marked NAT
and LP.
11. Install new convertible gas valve to manifold. (See
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.
NOTE: Use propane−gas−resistant pipe dope to prevent gas
leaks. DO NOT use Teflon tape.
INSTALL MANIFOLD−Natural Gas Only
NOTE: Install manifold if conversion is for use with natural gas.
For propane applications, manifold will be installed after Low
Gas Pressure Switch is installed.
1. Refer to Figure 3 and Figure 9.
Indicated surfaces
2. Align the orifices in the manifold assembly with the
to be 90 ˚+ or -2˚
3. Insert the orifices in the support rings of the burners.
A11407
NOTE: If manifold does not fit flush against the burner box, the
burners are not fully seated forward. Remove the manifold and
check burner positioning in the burner box assembly.
4. Attach the green/yellow wire and ground terminal to one
5. Install the remaining manifold mounting screws.
6. Connect the wires to the flame sensor and hot surface
Specifications subject to change without notice.
Convertible Gas Valve
INLET
PRESSURE TAP
breaker.
from the furnace casing.
Disconnect wires from Hot Surface Igniter (HSI) and
Flame Sensor. (See Figure 9)
secure the manifold assembly to the burner box and set
aside.
re−assembly later. (See Figure 3)
and discard valve.
Figure 4)
support rings on the end of the burner.
Manifold mounting tabs should fit flush against the burner
box.
of the manifold mounting screws. (See Figure 3)
igniter.
LP/NAT
CONVERTIBLE CAP
REGULATOR PLUNGER
NAT
GAS PRESSURE
REGULATOR
MANIFOLD
PRESSURE TAP
A11510
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