VS8510/VS8520 MILLIVOLT COMBINATION GAS CONTROL
68-0203
7
Wiring
Follow the wiring instructions furnished by the appliance
manufacturer, if available, or use the general instructions
provided below. Where these instructions differ from the
appliance manufacturer, follow the appliance manufacturer
instructions. For typical wiring diagrams, see Fig. 8 and 9.
All wiring must comply with applicable electrical codes and
ordinances.
Disconnect power supply before making wiring connections to
prevent electrical shock or equipment damage.
1.
Check the power supply rating on the gas control
and make sure it matches the available supply.
Install the transformer, thermostat, and other
controls, as required.
2.
This valve can only be used in a self-generating
system.
3.
Adjust the thermostat heat anticipator to the 0.1A
at 750 mV rating stamped on the valve operator.
Fig. 7. VS8520 Millivolt system wiring diagram with quick
drop-out thermocouple.
Q313
THERMOPILE
HIGH LIMIT
CONTROL
MILLIVOLT
THERMOSTAT
L
HI
O
O
FF
PILOT
ON
VS8520 HI/LO
MILLIVOLT
GAS VALVE
ELECTRODE
TARGET
QUICK DROP-OUT
THERMOCOUPLE
HI/LO
REGULATOR
M12669
GAS
CONTROL
KNOB
PILOT
ADJUSTMENT
SCREW
Fig.8. VS8510 Millivolt system wiring diagram without
quick drop-out thermocouple.
Q313
THERMOPILE
HIGH LIMIT
CONTROL
MILLIVOLT
THERMOSTAT
M12668
L
HI
O
O
FF
PILOT
ON
VS8510 HI/LO
MILLIVOLT
GAS VALVE
HI/LO
REGULATOR
GAS
CONTROL
KNOB
PILOT
ADJUSTMENT
SCREW
STARTUP AND CHECKOUT
The Millivolt Gas Valve System has two configurations. The
first configuration (VS8510) includes a gas valve, thermopile,
millivolt thermostat, and a pilot burner. The thermopile drives
the operator and the power unit The second configuration
(VS8520) includes a gas valve, quick drop-out thermocouple,
thermopile, millivolt thermostat and a pilot burner. In this
configuration, the thermopile drives the operator and the
quick dropout thermocouple operates the power unit.
Figures 9, 10, and 11 show how the gas flow is controlled for
each position of the control knob.