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Honeywell VS8420 Installation Instructions Manual
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Honeywell VS8420 Installation Instructions Manual

Millivolt gas valve
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APPLICATION
The VS8420 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.
SPECIFICATIONS
Main Gas Connection: Valve: 3/8 in. NPT thread.
Pilot Gas Connection and Flow:
Connection Size: 7/16-24 UNS.
Flow: 1700 Btuh at 4.0 in. wc pressure drop.
Thermocouple and Pilot Threads: Metric and UNS.
Ambient Temperature Range:
0°F to 175°F (-18°C to 79°C).
Option for 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: VS8420: 750 mV operator, 30 mV
thermocouple.
Approvals:
International Approval Services (IAS) Certificate:
C2030022.
European Community (CE) Certificate: Applied for.
® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. • All Rights Reserved
Millivolt Gas Valve
INSTALLATION INSTRUCTIONS
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.
VS8420
69-1165—3

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Summary of Contents for Honeywell VS8420

  • Page 1 Millivolt Gas Valve INSTALLATION INSTRUCTIONS APPLICATION INSTALLATION The VS8420 Millivolt Gas Valve is compact and has a When Installing this Product... 60,000 Btuh capacity (1 in. pressure drop for straight- through configuration). The design makes it ideal for 1. Read these instructions carefully. Failure to follow fireplace and space heating applications.
  • Page 2 VS8420 MILLIVOLT GAS VALVE CONVERTING THE GAS VALVE WARNING If the factory pressure regulator setting meets the appliance manifold requirement, convert the gas valve as Electrical Shock or Equipment Damage follows (see Fig. 1): Hazard. Can cause severe injury or death, or short 1.
  • Page 3 VS8420 MILLIVOLT GAS VALVE 1. Use new, properly reamed pipe free from chips. When tubing is used, assure the ends are square, TWO IMPERFECT deburred and clean. All tubing bends must be THREADS GAS CONTROL smooth and without deformation. 2. Run pipe or tubing to the valve. If tubing is used,...

  • Page 4: Operation

    The connecting wires of the piezo include a terminal to connect to the electrode of the pilot burner. The piezo is replaceable. Pilot Gas Lighting Procedure VS8420 HI/LO MILLIVOLT GAS VALVE Lighting Standard Pilot (Without Piezo) 1. Turn the knob counterclockwise to the PILOT position, push the knob down, and hold in position.
  • Page 5 Remove the pressure regulator adjustment cap sequence can begin again. The VS8420 drops out screw. within 30 seconds. b. Using a screwdriver, turn the inner adjustment 2.

  • Page 6: Maintenance

    2. Extinguish pilot flame. The VS8410 pilot gas flow Follow the instructions provided by the appliance should stop within three minutes; the VS8420 pilot manufacturer or turn up the thermostat to call for heat. gas flow stops within thirty seconds. Pilot gas...

  • Page 7: Pre-Lighting Checks

    Fire or Explosion Hazard. Can cause property damage, severe injury or death. Exactly follow the instructions for Pre-Lighting WIRING TERMINALS Checks. M17559 Fig. 8. Identification of VS8420 terminals for troubleshooting. Table 2. VS8420 Troubleshooting Table. Connect Multimeter Test Test Title Between Terminals...
  • Page 8 VS8420 MILLIVOLT GAS VALVE 3. Thermocouple: Have thermostat contacts open 4. Operator Pull-in: Have thermostat contacts open and pilot lit with the Pilotstat knob turned to PILOT. and pilot lit with Pilotstat knob turned to PILOT. Reading should be a minimum of 18 mV for a new Close thermostat contacts.