V4730C/V8730C/V4734C 1:1 Gas/Air Servo Regulated Gas Valves
EN2R-9074 0612R1-NE
ELECTRICAL CONNECTIONS
Wiring
1. Use 14, 16 or 18 AWG copper conductor, 600 volt insulation,
moisture-resistant wire for line voltage connections. Recom-
mended wire types are TTW60C, THW75C or THHN90C.
2. Follow the instructions below for wiring the gas valve. See
Fig. 16 and 17 for reference.
2.a T1 (yellow) will be L2 (120 Vac or 24 Vac).
2.b T2 (black) will be L1 (120 Vac or 24 Vac) to Valve 1.
2.c T3 (blue) will be L1 (120 Vac or 24 Vac) to Valve 2.
2.d Ground (green) will be earth ground.
Fig. 16: Four-pin electrical plug connector
Fig. 17: Electrical connection diagram
WARNING
Electrical Shock Hazard. Can cause severe injury
or death.
Disconnect the power supply before beginning wiring
to prevent electrical shock. More than one disconnect
may be involved.
ADJUSTMENTS AND FINAL CHECKOUT
The following procedures are related to the adjustments on the
main gas valve. For adjustments of the other devices (i.e., pres-
sure switches), refer to the instructions supplied with the applica-
ble device.
Pressure Tap Points (Fig. 18)
The V4730C/V8730C/V4734C Valves have a number of connec-
tion points (1/8 in. [3 mm] NPT plugs) for measuring pressure
and/or mounting a pressure switch. The pressure tap points are:
1 inlet pressure at first SSOV flange tap.
2 inlet pressure at first SSOV.
P outlet pressure at first SSOV.
3 inlet pressure at second SSOV.
4 outlet pressure at second SSOV flange tap.
The following pressures can be measured:
1. Inlet pressure-tap on inlet flange (1).
2. Pressure after inlet screen (2).
3. Unregulated intermediate pressure-pressure between the
two shutoff seats (P).
4. Regulated intermediate pressure-pressure between the shu-
toff valves (3).
5. Outlet pressure-tap from flange (4).
The corresponding numbers (2, P, 3) can be found on the side of
the valve.
Note: To mount the C6097 Pressure Switch, refer to instructions
in form number 65-0237, furnished with the switch. The
pressure switch can be mounted to 2, P, or 3 on either
side of the valve.
Fig. 18: Pressure tap points
Second Valve, Fast Opening
Flow rate is adjusted from 0% to 100% of full rated flow. To ad-
just the flow rate:
1. Remove the flat, round, blue plastic cap from the cover.
Using a 3 mm (7/64 in.) hex wrench, turn the adjustment
screw counterclockwise to increase or clockwise to decrease
the flow rate.
2. Snap the flat, round, blue plastic cap back onto the cover.
Final Checkout of the Installation
Set the system in operation after any adjustment is completed
and observe several complete cycles to ensure that all burner
components function correctly.
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death or property da-
mage.
Only fully qualified, experienced, flame safeguard
technicians should make adjustments on the valve.