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Honeywell V48A, Product Data, Page: 8 / 12

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Honeywell V48A Product Data Download Page 8

V48A,F,J; V88A,J DIAPHRAGM GAS VALVES

60-2080—9

8

Fig. 8. Installing optional 126590 adjustable bleed valve.

Fig. 9. Installing optional bleed orifice.

OPERATION

Operation of the V48 and V88 Valves  

(Fig. 10)

When the controller is not calling for heat, the coil is 

de-energized. The plunger in the 3-way actuator is in the 

DOWN position so the bleed port is closed and the supply port 

is open. Gas flows into the top part of the valve. The gas 

pressure on top of the diaphragm, the weight, and the spring 

hold the valve closed.

Fig. 10. Operation of V48 and V88 diaphragm gas valves.

On a call for heat, the controller contacts close and the coil is 

energized. This pulls the plunger to the UP position, opening 

the bleed port and closing the supply port. The gas in the top 

BLEED TAPPING

126590 ADJUSTABLE BLEED VALVE

SLEEVE

COMPRESSION NUT

1/4 INCH

TUBING

7/16-24 UNS

ADJUSTING SCREW

7/16 INCH HEX

1/8-27 NPT

M7290

BLEED PORT

1/8-27 NPT

M7298A

1/8 INCH DIAMETER ROD

BLEED ORIFICE

(SELECTED)

GAS 

SUPPLY

PASSAGE

BLEED 

PORT

PLUNGER

SPRING

WEIGHT

DIAPHRAGM

MAIN 

GAS

SUPPLY

TO BURNER

VALVE CLOSED

GAS 

SUPPLY

PASSAGE

BLEED 

PORT

PLUNGER

SPRING

WEIGHT

DIAPHRAGM

MAIN 

GAS

SUPPLY

TO BURNER

VALVE OPENING

GAS 

SUPPLY

PASSAGE

BLEED 

PORT

PLUNGER

SPRING

WEIGHT

DIAPHRAGM

MAIN 

GAS

SUPPLY

TO BURNER

VALVE OPEN

M8489

Summary of Contents for V48A

Page 1: ...mum closing time V48J V88J rated for 150 F 66 C ambient temperature V48F rated for 5 psi lb per sq in 34 5 kPa V48A and V88A rated for either 1 2 or 1 psi 3 4 or 6 9 kPa depending on model V48J and V88J rated for 1 psi 6 9 kPa One model for natural and LP gases Wide range of sizes and capacities Firm closing diaphragm is both weight and spring loaded Valve closes on power failure recommended for f...

Page 2: ...Body Material Die cast aluminum Pilot Tapping see Table 1 for thread type 3 4 through 1 1 2 inch valves 1 8 27 NPT or 1 8 28 BSP PI 2 through 3 inch valves 1 4 18 NPT Bleed Tapping see Table 2 for thread type 1 8 27 NPT or 1 8 28 BSP PI Valve Opening Time Five seconds maximum at 2 oz in 2 0 86 kPa pressure Adjustable bleed valve assembly or fixed bleed orifices available for longer opening time NP...

Page 3: ... 1 1 2 2 110V 50 Hz V88A 24V 60 Hz 1 2 3 4 3 4 1 1 1 4 1 1 2 1 6 9 3 4 1 1 1 4 1 1 2 2 2 1 2 3 V88J 24V 60 Hz 6 9 1 1 1 4 Valve Size in Valve Opening Time seconds No Orifice Orifice No 122160 0 018 in 0 46 mm Orifice No 124674 0 011 in 0 28 mm 1 1 2 3 1 1 4 1 5 6 1 1 2 1 5 6 2 4 15 32 2 1 2 4 23 37 3 5 24 37 1 2 1 2 BLEED TAPPING 1 8 27 NPT OR 1 8 28 BSP PL PILOT TAPING 2 1 8 27 NPT FOR 3 4 THROUG...

Page 4: ...he same size as the first valve INSTALLATION When Installing This Product 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced flame safeguard control technician 4 After ins...

Page 5: ...se this may result in gas leakage at the connection 2 Unscrew brass compression fitting from pilot gas tapping Fig 4 Slip the fitting over the tubing and slide out of the way PRESSURE DROP VS CAPACITY FOR 0 64 SP GR GAS A G A RATING FOR 0 64 SP GR GAS AT 1 IN PRESSURE DROP VALVE SIZE CAPACITY 3 4 IN 1 IN 1 1 4 IN 1 1 2 IN 2 IN 2 1 2 IN 3 IN 668 cf h 1021 cf h 2100 cf h 2400 cf h 4178 cf h 5100 cf ...

Page 6: ...nd of bleed tubing to main burner or to outside atmosphere WIRING 1 Disconnect the power supply before making wiring connections to prevent electrical shock and equipment damage Fig 4 Connecting tubing to pilot for bleed gas tapping 2 All wiring must comply with applicable electrical codes ordinances and regulations Use NEC Class 1 line voltage wiring WRONG WRONG WRONG RIGHT 2 CLEAN THREADS MODERA...

Page 7: ...ice Fig 5 Typical wiring diagram for V48 Installation of an Optional Adjustable Bleed Valve Fig 8 NOTE This device is not available for valves with BSP PI threads Screw the 126590 Adjustable Bleed Valve into the tapping marked BLEED Be sure to screw the end with the 1 8 NPT threads into the BLEED tapping Complete the bleed line connection Then alternately energize and de energize the valve actuato...

Page 8: ...nd V88 diaphragm gas valves On a call for heat the controller contacts close and the coil is energized This pulls the plunger to the UP position opening the bleed port and closing the supply port The gas in the top BLEED TAPPING 126590 ADJUSTABLE BLEED VALVE SLEEVE COMPRESSION NUT 1 4 INCH TUBING 7 16 24 UNS ADJUSTING SCREW 7 16 INCH HEX 1 8 27 NPT M7290 BLEED PORT 1 8 27 NPT M7298A 1 8 INCH DIAME...

Page 9: ...ge Do not allow fuel to accumulate in the combustion chamber If fuel is allowed to enter the chamber for longer than a few seconds without igniting an explosive mixture could result CAUTION Equipment Damage Hazard Can cause equipment damage and improper operation 1 Do not put the system into service until you have satisfactorily completed all applicable tests described in the Checkout section of t...

Page 10: ...ard control for more information Replacing the coil assembly Figs 12 through 15 1 Open the master switch to disconnect all power to the valve actuator 2 Loosen the cover screw in the front of the actuator housing Fig 12 and remove the housing cover 3 Disconnect the external wires from the two internal black leadwires Fig 12 4 Remove the two torx screws inside the actuator housing Fig 13 and lift o...

Page 11: ...cycle the valve several times with the manual fuel shutoff cock closed Make sure the valve and actuator function properly Also perform the Valve Leak Test that follows before putting the valve into service Valve Leak Test Fig 7 This is a test for checking the closure tightness of a gas safety shutoff valve It should be performed by qualified personnel during the initial startup of a burner system ...

Page 12: ...xceed the values listed in Table 5 Table 5 Allowable Leakage for V48 V88 Valves a Natural gas multiply air by 1 25 b Bubble leakage Divide natural gas by 573 then multiply by 14 NOTE For international leak test requirements contact the office of the appropriate approval agency After the test 11 Close the upstream manual gas cock A 12 Close the test petcock F remove the test apparatus and replace t...

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