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Honeywell VS8420C Installation Instructions Manual

Vs8420c millivolt gas valve
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APPLICATION
The VS8420 Millivolt Gas Valve is compact and has a
low capacity. The design makes it ideal for central heat-
ing, fireplace, and space heating applications.
The VS8420 Millivolt Gas Valve is approved in accor-
dance with existing European standards.

SPECIFICATIONS

Main Gas Connection:
Valve:3/8" ISO 7/1 internal thread for 12 mm outside
diameter tube.
Inlet connection at inlet side or at bottom.
Outlet connection at outlet side or at bottom.
Pilot Gas Connection and Flow:
Connection Size: M10 x 1 for 4 or 6 mm outside diame-
ter tube. At inlet side or at bottom.
Flow: Adjustable from 0.014 m3/h air at 35 mbar inlet
pressure to 0.105 m3/h at 7.5 mbar.
Thermocouple and Pilot Threads:
Metric and UNS.
Thermocouple connection: M10 x 1 at bottom. Optional at
the outlet side with use of a thermocouple re-route.
Ambient Temperature Range: 0°C to 80°C (32°F to
175°F).
Maximum Inlet Pressure: 60 mbar (24 in. wc)
Pressure Regulation (Standard Regulator):
Servo regulator with adjustable outlet pressure; in
accordance with EN 88, class C.
Natural Gas: 9 mbar, typical.
LP: 27 mbar, typical.
Regulator Adjustments (Standard Regulator):
Natural Gas: 7.5 mbar to 12.5 mbar field adjustable.
LP: 20 mbar to 30 mbar field adjustable.
In appliances where no regulation is required, the pres-
sure regulator must be blocked by turning the pressure
regulator adjustment screw fully down. The regulator
will then be set at 30 mbar.
® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • All Rights Reserved
VS8420C,M
Millivolt Gas Valve
INSTALLATION INSTRUCTIONS
Voltage: VS8420: 750 mV operator, 30 mV thermocou-
ple.
Approvals: European Community (CE) Certificate: CE-
0063AU1270.
Other Features:
Pressure Tap: 9 mm outside diameter at inlet and outlet
sides in accordance with EN 126.
Screen: Fine mesh inlet screen.
Interrupter (ECO) Connection: 6.3 mm tab connectors.
Piezo Sparker: Optional piezo sparker.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a haz-
ardous 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 asphyxia-
tion.
Use only vented gas valve models on vented
appliances. Use only unvented gas valve mod-
els on unvented appliances.
69- 1304

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Summary of Contents for Honeywell VS8420C

  • Page 1: Specifications

    In appliances where no regulation is required, the pres- sure regulator must be blocked by turning the pressure regulator adjustment screw fully down. The regulator will then be set at 30 mbar. ® U.S. Registered Trademark Copyright © 1999 Honeywell Inc. • All Rights Reserved 69- 1304...
  • Page 2 Can cause property damage, severe injury or number 396087-2 to convert from natural gas to LP. death. Follow these instructions exactly: High/low regulator model VS8420C cannot be converted. 1. Turn off gas supply at the appliance service valve before starting installation, and perform...
  • Page 3 VS8420C,M MILLIVOLT GAS VALVE Pilot Gas Connection 1. Square off the end of tubing and remove burrs. DROP 2. Slip compression fitting over tubing. Insert tubing PIPED HORIZONTAL CONTROL into pilot outlet connection until it bottoms, slide SUPPLY fitting into place and turn finger tight. Do not use jointing compound.

  • Page 4: Operation

    VS8420C,M MILLIVOLT GAS VALVE APPLY WRENCH FROM BOTTOM OF GAS CONTROL TO SHADED AREA M12679 Fig. 5. Proper use of wrench on gas valve. Wiring ECO Connection (Supplementary) Follow the wiring instructions furnished by the appliance 1. Push the ECO into the window of the gas valve.
  • Page 5 VS8420C,M MILLIVOLT GAS VALVE position. The pilot valve opens and allows gas to flow to the pilot burner. 2. Light the pilot burner while holding down the knob until a strong flame is present (approximately 60 seconds). CONNECTOR 3. Release the knob. The shaft will move upward and engage the safety valve lever that opens the safety valve.
  • Page 6 VS8420C,M MILLIVOLT GAS VALVE Standard Pressure Regulator Perform Gas Leak Test 1. Check the manifold pressure listed on the appli- ance nameplate. Gas valve outlet pressure WARNING should match the nameplate. 2. With the main burner operating, check the gas Fire or Explosion Hazard.

  • Page 7: Check Safety Shutdown Performance

    VS8420C,M MILLIVOLT GAS VALVE Checking Gas Input With Manometer The maintenance program should include regular system checkout as outlined in the Checkout section, and checkout of the control system as described in the NOTE: Both the inlet and outlet pressure taps have a appliance manufacturer literature.

  • Page 8: Pre-Lighting Checks

    VS8420C,M MILLIVOLT GAS VALVE Pre-Lighting Checks 4. If the knob does not operate by hand, the valve should be replaced by a qualified service techni- 1. Before lighting, smell around the appliance area cian. for gas. If the appliance uses LP gas, be sure to 5.

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