Carrier KGBPN42011SP, Installation Instructions Manual

6

!

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.

Figure 8

Gas Valve (Single Stage) without Tower
Pressure Ports and Green Label

A13048

ON/OFF Switch

Regulator Seal Cap

Regulator Adjustment
Regulator Seal Cap under Cap

1/2” NPT Outlet

1/8” NPT Manifold
Pressure Tap

1/8” NPT Inlet
Pressure Tap

1/2” NPT Inlet

SINGLE-STAGE

Regulator Spring
Propane - White 8.5 turns
Natural Gas - Silver 8.5 turns

Regulator Adjustment
Screw

Regulator Seal Cap

Remove the propane regulator spring (white)

Install the natural gas regulator spring (silver)

Figure 8 (cont) 

−

 Gas Valve (Single Stage) with

Tower Pressure Ports and without the Green Label

ON/OFF SWITCH

1/8” NPT INLET

PRESSURE TAP

REGULATOR SEAL CAP

(REGULATOR ADJ.

UNDER CAP)

1/2” NPT

OUTLET

MANIFOLD PRESSURE TAP

SET SCREW: 3/32” HEX HEAD

ACCEPTS 5/16” HOSE CONNECTION

OUTP

INP

VENT

1/2” NPT

INLET

INLET PRESSURE

TAP SET SCREW:

3/32” HEX HEAD

ACCEPTS 5/16”

HOSE CONNECTION

Representative drawing only, some models may vary in appearance.

1/8” NPT

INLET PRESSURE TAP

1/2” NPT

INLET

1/2” NPT

OUTLET

Representative drawing only, some models may vary in appearance.

A170118

A170133

1. Refer to 

Figure 8

.

2. Be sure gas and electrical supplies to furnace are off.
3. Remove cap that conceals the adjustment screw for the

gas

−

valve regulator. (See 

Figure 8

)

4. Remove the regulator adjustment screw.
5. Remove the Propane regulator spring (white).
6. Install the natural gas regulator spring (silver).
7. Install the regulator adjustment screw.
8. Turn the adjusting screw clockwise (in) 8.5 full turns. This

will increase the manifold pressure closer to the natural

gas set point. (See 

Figure 8

)

9. DO NOT install regulator seal cap at this time.

REMOVE LOW GAS PRESSURE

SWITCH

There are two ways that the Low Gas Pressure Switch (LGPS)
could have been installed during the original natural to Propane

gas conversion.

All 14 3/16-in Casings or Vent Passed Between Inducer

Assembly and Burner Assembly

If the vent pipe passes between the inducer and burner

assembly, or the furnace is a 14 3/16-in. wide casing. The switch

may be installed as shown in 

Figure 9

.

1. Remove low gas pressure switch, brass street 90

_

 elbow,

brass Hex nipple, brass tee and black iron street 90

_

elbow from the gas valve inlet pressure tap. (See 

Figure 9

)

Use pipe dope approved for use with Propane gas. DO NOT use
Teflon tape.

2. Apply pipe dope sparingly to the 1/8

−

in. (3 mm) NPT pipe

plug (provided in kit) and install in the 1/8

−

in tapped

inlet

−

pressure tap opening in the gas valve. DO NOT

over

−

tighten. Check for gas leaks after gas supply has

been turned on.

Figure 9

LGPS for 14

−

3/16 Casing or when vent

passes between inducer and burner
assembly

Brass Street Tee

Brass Hex Nipple

Brass Street 90

Low Gas Pressure Switch

Black Iron Street 90 Pointing

Inlet Pressure Tap with Plug

A170141

(Optional inlet pressure

tap on some models)

!

WARNING

FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal injury

and/or death.
NEVER test for gas leaks with an open flame. Use a

commercially available soap solution made specifically for the

detection of leaks to check all connections. A fire or explosion

may result causing property damage, personal injury or loss of

life.