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Shut down the burner, and then restart. Repeat several
times to be sure the low-fire setting is suitable for correct
burner lightoff.
Turn off power supply. Remove R-W jumper, and recon-
nect the lead to terminal R on the V9055.
To function as intended, the V9055 must be connected to
a properly sized valve. The proper sized V5055B Gas Valve
with characterized guide is recommended for optimum con-
trol and low-fire repeatibility.Too large of a valve will not
properly modulate the gas flow. When the actuator is ener-
gized, it will drive at least to the adjusted low-fire position.
The distance it will open beyond this low-fire position
depends on the demands of the modulating controller.
CHECKOUT
CAUTION
Only a trained, experienced, flame safeguard control
serviceman should service or replace this control.
After the valve installation is complete, cycle the valve a
few times with the manual fuel shutoff cock closed before
testing the system in actual operation.
SERVICE
The actuator is not field repairable except for replacing
the auxiliary switch. See Install Accessory Switches section
for the procedure.
Do not disassemble the valve actuator. Perform the fol-
lowing checks before removing and replacing the V9055
Gas Valve Actuator.
ADJUSTMENTS • OPERATION • CHECKOUT AND SERIVCE
ADJUST THE AUXILIARY SWITCH (IF USED)
The auxiliary switch is adjustable throughout the stroke
of the actuator. With the switch installed in the actuator,
turn the adjusting screw (Fig. 3) clockwise
switch to operate earlier in the stroke and counterclockwise
to operate later in the stroke.
When the controller calls for no heat, the actuator will
modulate the valve to the low-fire position. When power to
the actuator is interrupted, the valve will completely close.
Fig. 6 shows the V9055 in a typical flame safeguard
control system.
Checkout and Service
1. With manual gas valve closed, energize the V9055
and check for voltage on terminals 1 and 2. Actuator should
modulate to the low-fire position.
CAUTION
Label all wires prior to disconnection when servic-
ing valves. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
2. Disconnect the leads from the modulating controller
(terminals W,R, and B). Connect a manual potentiometer,
color-to-color, to terminals W, R, and B on the actuator. With
the valve energized, use the potentiometer to open and close
the actuator. It should run from the low-fire position and to
the fully open position.
If the actuator itself has failed, return it to the factory for
repair.
7
V9055A,D
to cause the
Operation
60-2311—6
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