Honeywell V8944B 用户手册

11

65-0214—08

1. Valve outlet pressure measurements are made at a point 

approximately five pipe diameters downstream from the 

valve outlet. Consider pressure measurements made at 

the outlet pressure tap as reference measurements only, 

because turbulence and dynamic gas flow effects may 

result in erratic pressure readings. 

2. Shut off gas supply to valve and make sure valve is 

closed when setting up pressure measuring equipment. 

3. Set up pressure measuring equipment.

4. Make sure the valve is closed. Turn on the supply gas to 

the valve.

5. Set the thermostat or controller to energize the valve and 

check the final outlet pressure. See step 1. Allow enough 

time for the system pressure to stabilize.

6. For regulator setpoint and spring range, please refer to 

Table 3.

7. The low pressure regulator (V4944/V8944B,C,L,N) and 

high pressure regulator V4943V8943B,C,N and

 V4944/V8944B,C,L,N) adjustment screws (use a T-40 

six-lobe [TORX®] driver or 5/16-in. standard driver) are 

located under the slotted aluminum screw cap(s) of the 

adjustment screw housings (see Fig. 1). To adjust the 

pressure setting:

a. Temporarily remove the slotted aluminum screw cap 

and gasket from the housing that contains the 

regulator adjustment setscrew.

b. Turn the adjustment setscrew (use a T-40 six-lobe 

[TORX®] driver or 5/16-in. standard driver) clockwise 

to increase the pressure setting or counterclockwise 

to decrease the pressure setting. Allow adequate time 

(30 to 60 seconds) for the pressure to reach 

equilibrium between pressure adjustments.

c.  After the regulators have been properly adjusted, 

replace the gasket and slotted aluminum screw cap 

on the adjustment screw housing. 

8. Start the system and observe its operation through at 

least one complete cycle to make sure the valve 

functions properly.

Valve Leak Test (See Fig. 15).

This test checks the tightness closure of a gas safety shutoff 

valve. It should be performed by a qualified technician during 

the initial startup of a burner system, or whenever the valve is 

replaced (see Service Information section). It is recommended 

that this test also be included in scheduled inspection and 

maintenance procedures.

1. De-energize the control system to make sure there is no 

power to the safety shutoff valve (C) shown in Fig. 15.

2. Close the upstream manual gas cock (A).

3. Make sure the manual test petcock (F) is closed in the 

leak test tap assembly (D).

4. Remove the leak test tap plug (valve outlet pressure tap 

can be used as a test tap) and connect the test 

apparatus to the leak test tap (D).

5. Close the downstream manual gas cock (E).

6. Open the upstream manual gas cock (A).

7. Run the safety shutoff valve (C) to its fully open position 

(through the safety system); then immediately 

de-energize the system to close the valve.

8. Immerse a 1/4 in. tube vertically 1/2 in. (13 mm) into a jar 

of water.

9. Slowly open the test petcock (F).

10. When the rate of bubbles coming through the water 

stabilizes, count the number of bubbles appearing during 

a ten-second period. Each bubble appearing during a 

ten-second period represents a flow rate of 

approximately 0.001 cfh.

To meet code requirements, leakage must not exceed the 

values in Table 5.

a

Based on air standard conditions, test pressures in 

accordance with ANSI Z21.21, Section 2.4.2 and a maximum 

of 235 cc/h per inch of seal-off-diameter. Seal-off diameter is 

not the same as pipe size.

11. Close the upstream manual gas cock (A).

12. Close the test petcock (F), remove the test apparatus, 

and replace the leak test tap plug (D).

13. Open the upstream manual gas cock (A) and energize 

the safety shutoff valve (C).

14. Test with soap bubbles to make sure there is no leak at 

the test tap (D).

15. De-energize the safety shutoff valve (C).

16. Open the downstream manual gas cock (E).

17. Restore the system to normal operation.

1, 1-1/4

353

11 (Nat. gas), 7 (LP)

1-1/2, 2

453

14 (Nat. gas), 9 (LP)

M9547F

GAS

SUPPLY

UPSTREAM

MANUAL

GAS COCK

DOWNSTREAM

MANUAL

GAS COCK

BURNER

PRV

MANUAL

TEST

PETCOCK

SSOV

1/4 IN. (6 MM) 

FLEXIBLE

TUBING
1/4 IN. (6 MM)

ALUMINUM OR 

COPPER PILOT 

TUBING

JAR OR GLASS

WITH WATER

CUT AT

45 DEGREE

ANGLE

CAN ALSO BE A PERMANENT PETCOCK.

PRV = PRESSURE REGULATING VALVE.

SSOV = SAFETY SHUTOFF VALVE.

 USE ONLY ONE OF THE DOWNSTREAM TAPS ON THE SS0V.

1

2

3

4

4

2

3

1

1

2

(13 MM)

LEAK 

TEST 

TAP