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INSTALLATION INSTRUCTIONS
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69- 1219- 1
VS8421
Ventfree Millivolt Gas Valve
APPLICATION
The VS8421 Millivolt Gas Valve is compact and has a
60,000 Btuh capacity (1 in. pressure drop for
straight-through configuration). The design makes it ideal
for fireplace and space heating applications that are
ventfree (unvented). This valve is only for ventfree
(unvented) applications.
SPECIFICATIONS
Main Gas Connection:
Valve: 3/8 in. NPT thread.
Pilot Gas Connection, Flow and Adjustment:
Connection Size: 7/16-24 UNS.
Flow: 1700 Btuh at 4.0 in. wc pressure drop.
Pilot is not adjustable.
Thermocouple Connection:
M8 x 1.
Pilot Threads:
Metric and UNS.
Ambient Temperature Range:
0°F to 175°F (-18°C to 79°C).
Option for -40°F (-40°C) and 225°F (107°C).
Pressure Regulation (Standard Regulator):
Servo regulator with adjustable outlet pressure.
Natural Gas: 3.5 in. wc, typical.
LP: 11 in. wc, typical.
Regulator Adjustments (Standard Regulator):
Natural Gas: 3 in. to 5 in. field adjustable.
LP: 8 in. to 12 in. field adjustable.
Voltage:
VS8421: 750 mV operator, thermocouple in
ODS pilot burner.
Approvals:
International Approval Services (IAS) Certificate:
C2030022.
European Community (CE) Certificate: Applied for.
INSTALLATION
When Installing this Product...
1.
Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3.
Installer must be a trained, experienced service
technician.
4.
After installation is complete, check out product
operation as provided in these instructions.
WARNING
Oxygen Depletion Hazard.
Can cause injury or death due to
asphyxiation.
Use only vented gas valve models on vented
appliances. Use only unvented gas valve models
on unvented appliances.
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury
or death.
Follow these instructions exactly:
1. Turn off gas supply at the appliance service
valve before starting installation, and perform
a Gas Leak Test after the installation is
complete.
2. Always install the sediment trap in the gas
supply line to prevent contamination of the
gas valve.
3. Do not force the gas valve control knob. Use
only your hand to turn the control knob. If the
knob does not operate by hand, the valve
should be replaced by a qualified service
technician.
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