Honeywell V8944B ユーザーズマニュアル

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN  55422
customer.honeywell.com

® U.S. Registered Trademark
© 2011 Honeywell International Inc.
65-0214—08    M.S.  Rev. 09-11 
Printed in United States

Use utmost care during troubleshooting. Line voltage 

is present right at the electrical terminations for the 

V4943B,C,N and V4944B,C,L,N valves, and present in 

all controller circuits for all V4943/V8943 and V4944/

V8944 valves.

1. If the valve will not open when the thermostat or 

controller calls for heat:

a. Check that there is voltage at the proper electrical 

terminations. Be careful—there should be line 

voltage at the actuator of V4943 and V4944 valves.

b. If there is no voltage at the actuator, first make sure 

line voltage power is connected to the master 

switch, the master switch is closed and overload 

protection (circuit breaker, fuse or similar device) 

has not opened the power line.

c. For V8943A only: If line voltage power is correct, 

check transformer output. Replace the transformer if 

necessary.

d. 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.

e. If there is proper voltage at the valve actuator but 

the valve still does not open, first check that the gas 

pressure at the valve is normal.

f. If the valve still does not open, replace the valve.

2. If the valve will not close when one or more of the 

appropriate contacts in the thermostat or controller, 

limit(s) or flame safeguard control is open:

a. Make sure that the gas flow is in the direction of the 

arrow on the valve body.

b. Make sure the valve actuator is wired in the correct 

circuit. Open the master switch to remove power 

from the valve actuator. If the valve closes now, the 

actuator may not be wired properly. Check and 

correct the wiring, if necessary.

c. Look for a short in the electrical circuit.

1. Only qualified service technicians should attempt to 

service or repair flame safeguard controls and 

burner systems.

2. Line voltage is present in the electrical circuits to the 

valve. Open the master switch before replacing the 

valve.

For periodic inspection and maintenance, set up a schedule 

and follow it. Include the burner valves (check for external 

leakage around all seals and joints with leak detector; also 

check for internal valve seat leakage—see Valve Leak Test 

section) and all other controls. Refer to the flame safeguard 

control instructions for more information.

Label all wires prior to disconnecting when servicing 

valves. Wiring errors can cause improper and 

dangerous operation.

Verify proper operation after servicing.