Honeywell V48A - User Manual

1 60-2080—8
V48A,F,J; V88A,J
Diaphragm Gas Valves
The V48 and V88 are solenoid-operated dia-
phragm valves suitable for LP (Liquefied Petro-
leum), natural, and manufactured gases. They are
normally used on atmospheric boilers, commercial
water heaters, and rooftop heaters.
CONTENTS
Specifications ............................................... 2
Ordering Information .................................. 2
Installation ................................................... 5
Operation ..................................................... 8
Checkout and Troubleshooting ................... 9
Service Information ................................... 10
F.P. • Rev. 9-94 • ©Honeywell Inc. 1994 • Form Number 60-2080—8
■ Line voltage, 2-wire thermostat or controller used
with a V48; V88 used with 24V thermostat.
■ Valves provide slow opening and fast closing.
■ Two second maximum closing time for 2 through
3 in. valves.
■ One second maximum closing time for 3/4 through
1-1/2 in. valves.
■ V48J, V88J rated for 150° F 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
final shutoff service.
■ Adjustable or fixed bleed orifices available for in-
stallation by OEM.
■ Valve position indicator on 1-1/4 in. V48A2227 and
2 in. V48F1103 Valves.

Summary

Specifications

Models

Details on V48A, V48F, V48J, V88A, V88J valve models and their specifications.

Maximum Operating Pressure

Gas Valve Sizing

Guide on how to determine the correct valve size based on capacity and pressure drop.

Installation

General Installation Notes

Preparing Piping and Installing Valve

Wiring

Operation

Valve Operation Mechanism

Explanation of how the valve opens and closes based on controller signals and gas pressure.

Checkout and Troubleshooting

Checkout Procedure

Troubleshooting Valve Not Opening

Diagnosing and resolving issues when the valve fails to open upon a call for heat.

Troubleshooting Valve Not Closing

Diagnosing and resolving issues when the valve fails to close when expected.

Service Information

General Servicing Precautions

Replacing the Coil Assembly

Step-by-step instructions for safely replacing the valve's coil assembly.

Honeywell V48A Specifications

General

Brand	Honeywell
Model	V48A
Category	Control Unit
Language	English