Honeywell V8944L, V8944B, V8944N, V8943C, V8944C User Manual

V4943/V8943B,C,N;
V4944/V8944B,C,L,N
Regulating Diaphragm Gas Valves

PRODUCT DATA

FEATURES

• Models are available for natural or liquid petroleum
(LP) gases.

• Valve models L, N are rapid opening (less than six
seconds) and fast closing, and are available for LP and
natural gases, respectively.

• Line voltage with two-wire thermostat or controller is
used with V4943; V8943 is used with 24V thermostat or
controller.

• V4944 is used with line voltage dual-stage thermostat
or controller; V8944 is used with 24V dual-stage
thermostat or controller.

• Slow opening B,C valve models are available for
natural and LP gases respectively.

• Valve closes on power failure; recommended for final
shutoff service.

APPLICATION

The V4943/V8943B and N (single stage) and V4944/V8944B
and N (two stage) are solenoid-operated diaphragm valves
suitable for natural gas only. The V4943/V8943C and
V4944/V8944C and L are solenoid-operated diaphragm
valves suitable for Liquefied Petroleum (LP) gas only. These
valves are used on boilers, unit heaters, duct furnaces,
makeup air and rooftop heaters.

• Valve closing time: 2 seconds maximum at 7 inches wc
inlet pressure.

• Valves rated for 0.5 pound per square inch (psi) (3.4
kPa).

• Leadwires and cover for electrical conduit connections
are provided.

Contents

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

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

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

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

Installation ........................................................................ 6

Operation .......................................................................... 9

Checkout and Troubleshooting ......................................... 10

Service Information .......................................................... 12

65-0214-08

V4943/V8943B,C,N; V4944/V8944B,C,L,N REGULATING DIAPHRAGM GAS VALVES

SPECIFICATIONS

Models:

All models are solenoid-operated regulating diaphragm gas

valves. Details are shown in Table 1.

Table 1. Model Availability.

Power

Volt ag e

and

Model

V4943B 120V

V4943N 1, 1-1/4,

V8943B 24V,(+10%,

V8943C 1, 1-1/4 LP

V8943N 1, 1-1/4,

V4944B 120V

V4944C LP

V4944L 1-1/4 <6

V4944N 1, 1-1/4,

V8944B 24V

V8944C 1, 1-1/4,

V8944L 1, 1-1/4 <6

V8944N 1, 1-1/4,

a

Includes natural gas, mixed air-natural gas, LP gas-air.

Frequency

(+10%,

-15%),
60 Hz

-15%)
50/60 Hz

(+10%,

-15%)
60 Hz

(+10%,

-15%)
50/60 hz

Maximum

Current

0.055A 6.6 1, 1-1/4,

0.363A 9.0 1, 1-1/4,

0.077A 9.0 3 to 25 Two stage 3

0.470A 11.3 3 to 25

Consumption

(VA

Maximum)

Pipe Size

(in.)

1-1/2, 2

1-1/2

1-1/2, 2

1-1/2

1-1/2, 2

1-1/2

1-1/2, 2

Thread

Typ e

NPT 0.5 3.4 3 to 25 Single

Maximum
Operating

Pressure

Opening

Time

(sec.)

<6

3 to 25

<6

Pressure

Regulation

stage

Type of

Gas

Natural

Natural

Natural

LP

Natural

Number
of Lead-

wirespsi kPa

a

2

a

a

a

Flow Capacity: See Table 2.

Table 2. V4/8943 and V4/8944 Flow Capacity.

CSA

Certified

1.0 in. pd

Pipe Size

(in.)

1 1,000 1,000,000 1,000 300

1-1/4 1,600 1,600,000 1,600 480

1-1/2 2,300 2,300,000 2,300 780

2 3,000 3,000,000 3,000 870

Natural

Gas cfh

Btuh per
1000 cfh

Natural

gas

Regulation Capacities

0.64 sp gr Natural Gas

Maximum

cfh

Minimum

cfh

Valve Pattern:Straight-through, non offset.

Valve Body Material:Die-cast aluminum.

Electrical Terminations:1/4 in. (6 mm) spade terminals

(quick connects). Leadwires and cover for electrical conduit
connections are provided.

Valve Closing Time: On power failure, a maximum of
2 seconds at 7 in. wc inlet pressure.

Ambient Temperature Ratings: -40°F to +150°F (-40°C to

+66°C).

Maximum Fluid Temperatures: 150°F (66°C).

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information,
or would like to comment on our products or services, please write or phone:

1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386

3. http://customer.honeywell.com or http://customer.honeywell.ca
International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech
Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.

65-0214—08 2

V4943/V8943B,C,N; V4944/V8944B,C,L,N REGULATING DIAPHRAGM GAS VALVES

CAUTION

Pressure Reference Port Vent: 5/16–24 UNF internal

tapping.

Standard Factory Settings: See Table 3.

Weight:

1 in., 1-1/4 in. valves: 4 lb (1.8 kg).
1-1/2 in., 2 in. valves: 5 lb (2.3 kg).

Dimensions: See Fig. 1.

Table 3. Factory Settings and Regulation Ranges.

Natural Gas (i.e. B, N models) LP Gas (i.e. C, L models)

Firing stages

a

Factory Setting Adj. Range

b

Factory Setting Adj. Range

Low Fire:

Standard Models 0.8” wc 0.8” to 2” wc 1.4” wc 1.4” to 4.2” wc

Special Models (Group 1) 1.6” wc 1.6” to 4.2” wc

Special Models (Group 2) 0.8” wc 0.8” to 2” wc

Special Models (Group 3) 0.8” wc 0.8” to 2” wc

High Fire:

Standard Models 3.5” wc 3” to 4.5” wc 10” wc 8.8” to 11.5” wc

Special Models (Group 1) 3.5” wc 3” to 4.5” wc

Special Models (Group 2) 3.5” wc 1.4” to 4.2” wc

b

Special Models (Group 3) 5” wc 4.0” to 7” wc

a

V4943 is a single-stage valve, please refer to “High Fire” for spring specifications.

b

Do not adjust or operate valve outside of the specified ranges.

DO NOT adjust or operate valve outside of the
specified ranges. Valve will not regulate or work
properly.

Special Models (Group 1): V4944B1075, V4944B1083, V4944B1091, V8944B1092, V8944B1100, V8944B1118
Special Models (Group 2): V4944B1109, V4944B1125, V4944B1141, V4944B1166; V4943B1050, V4943B1068, V4943B1076,

V4943B1084

Special Models (Group 3): V4944B1117, V4944B1133, V4944B1158; V4943B1092, V4943B1100, V4943B1118

Approvals:

Underwriters Laboratories Listed: File Number MH1639
CSA Certified: Report Number C2030020 (except those listed as Special Models Group 2 and Special Models Group 3)
Commonwealth of Massachusetts Product Certification Number: G1-12-05-22

Mounting Position:

Standard Position: Upright (horizontal).

NOTE: V4944B1059, V4944N1052 and V4944N1060 can

Accessories:

AT72D Transformer (40 VA) for all 24 Vac models.
204480 Vent Pipe Adapter

be mounted upright to 90 degrees from the
upright on the horizontal axis with respect to the
inlet connection.

3 65-0214—08

V4943/V8943B,C,N; V4944/V8944B,C,L,N REGULATING DIAPHRAGM GAS VALVES

6-9/16 (167)

FOR 1, 1-1/4

OR

7-3/8 (187)

FOR 1-1/2, 2

SIDE VIEW

6 (152)

6

(152)

TOP VIEW

M23375

ATMOSPHERIC
PRESSURE
REFERENCE
PORT WITH
INTERNAL
VENT LIMITER

OUTLET
PRESSURE
TAP

INLET
PRESSURE
TAP

PRESSURE
REGULATOR
ADJUSTMENT
CAPS

M23376

1 INCH V4/8944B/N REGULATION AREA

0.1

1

10

100

FLOW NATURAL GAS (CFH)

PRESSURE DROP (IN. WC)

100

1000

10000

PO < 2.5 IN.

ANY PO

PO > 2 IN.

Fig. 1. V4943/44 and V8943/44 dimensions in in. (mm).

Gas Valve Sizing

1. Check the burner nameplate for:

a. the type of gas used, and
b. the gas flow capacity. The capacity will be listed in

2. Contact the local gas utility for information regarding:
a. the specific gravity (sp gr) and
b. the Btu per cubic foot (Btucf) for the type of gas used.

3. Find the capacity in cf/h. If the capacity is listed in Btu,
convert to cf/h using the following formula:

4. For gases with specific gravities other than 0.64, multiply
the burner cf/h using the proper conversion factor in
Table 4.

Type of Gas sp gr (average) Multiply cfh by

Manufactured 0.60 0.968

Mixed 0.70 1.046

LP-Propane 1.53 1.546

LP-Butane 1.98 1.759

5. Use the corrected burner capacity in cfh when determin­ing the gas valve size in Figs. 2–9.

6. Determine the maximum pressure drop across the valve
and draw a vertical line at this pressure in Figs. 2–9.

British thermal units per hour (Btuh) or in cubic feet
per hour (cfh).

Capacity in cfh = Btuh (burner nameplate)

Btu/cf (gas utility)

Table 4. Gas Conversion Factors.

7. At the point of intersection of the vertical line and the

curve, draw a horizontal line to intersect the flow
(capacity) scale. The point of intersection indicates the
capacity that can be obtained with the maximum
pressure drop.

8. If the capacity at the maximum pressure drop is
insufficient, use the capacity vs. pressure drop curve for
the next larger valve size and repeat steps 6 and 7.

Fig. 2. Capacity vs. pressure drop of Natural Gas

curves for 1 in. valve.

65-0214—08 4