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Service Information - Honeywell V48F Manual

Diaphragm gas valves
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V48A,F,J; V88A,J
CHECKOUT AND TROUBLESHOOTING • SERVICE INFORMATION
CHECKOUT
Start the system and observe its operation through at
least one complete cycle to be sure the valve functions as
described in the Operation section.
TROUBLESHOOTING
CAUTION
Use utmost care during troubleshooting. Line volt-
age is present at the actuator for a V48 Valve, and
is present in all controller circuits for all V48 and
V88 Valves.
IMPORTANT: Do not assume that the valve must be
replaced until all other sources of trouble have been
eliminated.
If the valve will not open when the thermostat or
controller is calling for heat:
1. Check that there is voltage at the valve actuator
(black leadwires, Fig. 7). Be careful—there should be line
voltage at the actuator of a V48.
2. 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.
CAUTION
1. Only qualified service technicians should at-
tempt to service or repair flame safeguard con-
trols and burner systems.
2. Open the master switch before replacing the
coil assembly or the valve. Line voltage is
present in the electrical circuits to the valve.
SCHEDULED INSPECTION AND MAINTENANCE
A schedule should be set up and followed for periodic
inspection and maintenance for the burner and all other
controls and the valve(s). Refer to the instructions for the
flame safeguard control for more information.
REPLACING THE COIL ASSEMBLY (FIGS. 12
THROUGH 15)
1. Open the master switch to disconnect all power to the
valve actuator.
2. Loosen the cover screw in the front of the actuator
housing (Fig. 12) and remove the housing cover.
3. Disconnect the external wires from the two internal
black leadwires (Fig. 12).
4. Remove the two torx screws inside the actuator hous-
ing (Fig. 13) and lift off the housing.
60-2080—8
3. For a V88 only: If a line voltage power is okay, check
the transformer. Replace it if necessary.
4. If there is still no voltage at the actuator, make sure all
the appropriate contacts in the thermostat (or controller),
limit(s), and flame safeguard control are closed. If one or
more is open, determine the cause(s) and correct the con-
dition(s) before proceeding.
5. 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. Then make sure that the bleed line is
unobstructed.
6. If the gas pressure and bleed line are okay but the
valve still does not open, replace the coil assembly. (Refer
to the Specifications section for the proper part number,
and to the Service Information section for the proper
procedure.)
7. If you replace the coil assembly and the valve still
does not open, replace the valve.
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:
1. Make sure that the gas flow is in the direction of the
arrow on the valve body.
2. 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.
3. Look for a short in the electrical circuit.

Service Information

5. Remove the holding nut from the top of the coil
assembly (Fig. 13).
6. Lift the coil assembly straight up and off the plunger
tube assembly (Fig. 14).
7. Snap out the wraparound metal cover and remove the
metal base (Fig. 15). Save these parts for the replacement
coil.
8. Carefully unhook the cardboard insulator (Fig. 15)
and remove it. Save the insulator for the replacement coil.
9. Make sure the new coil assembly has the same part
number as the old one; then discard the old coil assembly.
10. Wrap the cardboard insulator around the new coil
assembly and carefully hook it together around the two
black leadwires (Fig. 15).
11. Insert the two black leadwires through the opening in
the metal base, and insert the new coil assembly into the
metal base (Fig. 15).
12. Snap the wraparound metal cover into place around
the new coil assembly (Fig. 15).
13. Slip the new coil assembly over the plunger tube
assembly (Fig. 14).
14. Replace the holding nut on top of the coil assembly
(Fig. 13) and tighten it securely.
15. Replace the actuator housing and tighten the two torx
screws holding it in place (Fig. 13).
16. Reconnect the external wires to the two internal
black leadwires (Fig. 12).
10

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This manual is also suitable for:

V48aV88aV88jV48j