7
Brass Street Tee
Brass Hex Nipple
Brass Street 90
Low Gas Pressure Switch
Black Iron Street 90 Pointing
Inlet Pressure Tap with Plug
Re
ï
install pipe plug
after removal
L13F011
Fig. 11 -- Low Gas Pressure Switch -- All Widths
L13F012
Fig. 12 -- Alternate Low Gas Pressure Switch --
17 1/2--in and Wider Furnaces
INSTALL LOW GAS PRESSURE SWITCH WIRES
1. Locate the orange wire in the kit with an insulated straight
female spade terminal and an insulated straight male ter-
minal on the other end.
2. Connect the female terminal to a terminal on the Low Gas
Pressure Switch.
3. Locate the orange wire in kit with an insulated straight fe-
male spade terminal and an insulated female flag terminal
on the other end.
4. Connect both straight female terminals of the orange wires
to the terminals on the Low Gas Pressure Switch.
INSTALL MANIFOLD
1. Refer to Fig. 2 and 3.
2. Align the orifices in the manifold assembly with the sup-
port rings on the end of the burner.
3. Insert the orifices in the support rings of the burners. Man-
ifold mounting tabs should fit flush against the burner
box.
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
of the manifold mounting screws. See Fig. 2.
5. Install the remaining manifold mounting screws.
6. Connect the wires to both rollout switches.
7. Connect the wires to the flame sensor and hot surface ig-
niter.
8. Connect the connector harness to gas valve.
NOTE
: Use only propane-resistant pipe dope. Do not use Teflon
tape.
9. Insert the gas pipe through the grommet in the casing. Ap-
ply a thin layer of pipe dope to the threads of the pipe and
thread the pipe by into the gas valve.
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.
10. With a back-up wrench on the inlet boss of the gas valve,
finish tightening the gas pipe to the gas valve.
11. Turn gas on at electric switch on gas valve.
MODIFY PRESSURE SWITCH WIRING
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’EQUIPEMENT D’OPERATION
Toute erreur de câblage peut être une source de danger et de
panne.
Lors des opérations d’entretien des commandes, étiqueter
tous les fils avant de les déconnecter.
PRUDENCE
!
1. Disconnect orange wire from Low Heat Pressure Switch
LPS on inducer housing. See Fig. 1.
2. Connect the orange wire from the Low Heat Pressure
Switch to the orange wire with the insulated male spade
terminal. See Fig. 13.
3. Connect the orange wire from the Low Gas Pressure
Switch to the terminal on the Low Heat Pressure Switch.
4. Route orange wires along wire harness. If possible, secure
with wire tie provided in kit.
A12372
Fig. 13 -- Pressure Switch Wiring
CHECK INLET GAS PRESSURE
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
DO NOT operate furnace more than one minute to check
inlet gas pressure, as conversion is not complete at this time.
CAUTION
!
NOTE
: This kit is to be used only when inlet gas pressure is
between 12.0--in. W.C. and 13.6--in. W.C.
1. Verify manometer is connected to inlet pressure tap on gas
valve. (See Fig. 10.)
