User Guide

ManualsBrandsHoneywell ManualsGas Valves & ControlsDiaphragm Gas Valve, Normally Closed, 1-1/2" NPT Pipe Size, 1/2 max. psi

Table Of Contents

PRODUCT DATA

Put UPC Code Here

65-0212-03

V4943A/V8943A

On/Off Diaphragm Gas Valves

APPLICATION

The V4943A and V8943A are solenoid-operated diaphragm

valves suitable for Liquefied Petroleum (LP) and natural

gases. They are normally used on atmospheric boilers,

commercial water heaters, and rooftop heaters.

FEATURES

• V4943A used with line voltage, two-wire thermostat or

controller.

• V8943A used with 24 Vac thermostat or controller.

• Valves open in less than six seconds.

• Rated for 0.5 psi (3.4 kPa).

• Rated for -40°F to +150°F (-40°C to 66°C).

• Firm closing; diaphragm is spring-loaded.

• Valves close on power failure; recommended for final

shutoff service.

• 1/4 in. (6 mm) spade terminal electrical connections.

Leadwires and cover for electrical conduit connections

are provided.

• Designed as replacement valves for V4843A/V8843A.

Contents

Application ....................................................................... 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 4

Wiring ............................................................................... 6

Operation ......................................................................... 7

Checkout and Troubleshooting ........................................ 7

Summary of content (8 pages)

PAGE 1
V4943A/V8943A On/Off Diaphragm Gas Valves PRODUCT DATA FEATURES • V4943A used with line voltage, two-wire thermostat or controller. • V8943A used with 24 Vac thermostat or controller. • Valves open in less than six seconds. • Rated for 0.5 psi (3.4 kPa). • Rated for -40°F to +150°F (-40°C to 66°C). • Firm closing; diaphragm is spring-loaded. • Valves close on power failure; recommended for final shutoff service. • 1/4 in. (6 mm) spade terminal electrical connections.
PAGE 2
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES SPECIFICATIONS Models (See Table 1): V4943A (120 Vac) solenoid-operated diaphragm valves for 0.5 psi (3.4 kPa) internal bleed. V8943A (24 Vac) solenoid-operated diaphragm valves for 0.5 psi (3.4 kPa) internal bleed. . Table 1. Models Available. Maximum Operating Pressure Model Voltage and Frequency (psi) (kPa) V4943A 120V/60 Hz 0.5 3.4 1, 1-1/4, 1-1/2, 2 NPT V8943A 24V/60 Hz 0.5 3.
PAGE 3
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES TOP VIEW SIDE VIEW 6 (152) 6-9/16 (167) FOR 1, 1-1/4 OR 6 (152) 7-3/8 (187) FOR 1-1/2, 2 PRESSURE ADJUSTMENT NOT APPLICABLE TO V4943A/V8943A M23369 INLET PRESSURE TAP OUTLET PRESSURE TAP Fig. 1. V4943/V8943 dimensions in in. (mm). Gas Valve Sizing 1. 2. 3. 5. Check the burner nameplate for (a) the type of gas used, and (b) the gas flow capacity. The capacity is listed in British thermal units per hour (Btuh) or in cubic feet per hour (cfh).
PAGE 4
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES Sizing Two Identical Valves Piped in Series 3. 4. Find the cfh for the type of gas used. Consider both valves as one unit. Determine the maximum pressure drop across the one unit. Find the pressure drop across the first valve by assuming it to be 45 percent of the total pressure drop. Find the valve size in Fig. 2–5. The second valve will be the same size as the first valve. V4943/8943A 1 IN. VALVE IN. WC PRESSURE DROP 10 10 IN. WC PRESSURE DROP 1. 2.
PAGE 5
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES When Installing this Product... 1. 2. 3. 4. Prepare Piping and Install Valve (Fig. 6). Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained experienced flame safeguard control technician.
PAGE 6
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES Valve Leak Test (See Fig. 7) Table 4. Allowable Leakage Rates. 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. 2. 3. 4. 5. 6. 7. 8. 9. 10.
PAGE 7
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES CHECKOUT AND TROUBLESHOOTING AUTOMATIC VALVE BLACK LIMIT(S) 24-VOLT THERMOSTAT ORANGE L1 (HOT) 1 L2 TRANSFORMER WARNING PV PV/MV MV Prevent Possible Explosion Hazard Do not let fuel 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. 2 FLAME SAFEGUARD CONTROL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
PAGE 8
V4943A/V8943A ON/OFF DIAPHRAGM GAS VALVES 3. 4. 5. 6. For V8943A only, if line voltage power is correct, check the transformer output. Replace the transformer if necessary. If there is still no voltage at the actuator, make sure all appropriate contacts in the thermostat or controller, limits and flame safeguard control are closed. If one or more is open, determine the cause(s) and correct the condition(s) before proceeding.