Start--up and check--out, Reassembly, Gas valve adjustment – Honeywell PGF3 User Manual

Page 5

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462 06 1211 00

3/17/06

Typical Gas Valve Honeywell

SV9501

INLET

OUTLET

Pilot

Adjustment

Pilot

Outlet

Wiring Terminals

Outlet Pressure Tap

Connect manometer here to

check outlet pressure. Must be

adjusted per Table 1.

Inlet Pressure

Tap (Hidden)

25--22--25

Figure 8

Typical Gas Valve Honeywell

VR8205S

Figure 9

V

T

25--24--98a

HONEYWELL

ON

OFF

Regulator Adjustment

Under Cap

Inlet

Pressure

Tap

1

/

8

NPT

INLET

OUTLET

Outlet

Pressure

Tap

1

/

8

NPT

Typical Honeywell

Regulator Assembly

PRESSURE

REGULATOR

HOUSING

Cap Screw

Black

Silver

Pressure

White

White

Regulator

Adjusting

Screw

Stainless

Spring

Red

Steel

LP

Gas

Natural

Gas

Figure 10

4. Install the pressure regulator adjusting screw. This will set

the manifold pressure close to required setting for normal

operation.

5. Replace the regulator cap screw.
6. Attach gas valve conversion label (found in Honeywell con-

version kit) to gas valve.

Reassembly

Reassemble all parts in reverse order as removed. Attach Natural
Gas Conversion Label next to the unit rating plate. Fill out and
attach the Field conversion Label to the front exterior of the
furnace.

D

Manifold Assembly -- Be sure to engage the main burner

orifices in the proper openings in the burners.

D

Testing for leaks -- After reassembly, turn the gas on and

check all joints for gas leaks using a soapy solution. All

leaks must be repaired immediately.

Start--up and Check--out

1. Remove the plug from the Inlet Pressure Tap on gas valve

and install a manometer. (See Figures 7, 8, 9, & 10)

2. Open manual gas line valve to unit. Check for gas leaks and

correct as necessary. Check supply pressure. Refer to

Table 2 for proper supply pressure values. If not within

these limitations DO NOT OPERATE UNIT, contact gas

supplier.

3. Close manual gas line valve to unit, remove manometer and

replace inlet pressure tap plug.

Gas Valve Adjustment

4. With the gas valve knob in the OFF position, remove the

pressure tap plug from the outlet end of the valve, and con-

nect a “U” tube manometer to the pressure port. (See Fig-

ure 7, 8, 9 & 10).

5. Turn the gas valve knob to the ON position and restore elec-

trical power to unit. Cycle the main burner on and off several

times to stabilize the pressure regulator diaphragm. This

MUST be done before an accurate pressure reading can be

obtained.

6. With the main burner on, read the pressure gauge. Manifold

pressure should be adjusted to values from Table 2. Turn

pressure regulator adjusting screw clockwise to increase or

counterclockwise to decrease manifold pressure. Burner

Input must not exceed nameplate rating. Refer to Section

“Checking Input Rate”.

7. Turn gas valve to OFF. Remove the pressure gauge and re-

place the pressure tap plug and pressure regulator cap

screw.

8. With gas valve on, observe furnace through two or more

complete cycles to be sure all controls are operating.

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