Honeywell VS8521 Installation Instructions Manual
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Honeywell VS8521 Installation Instructions Manual

Honeywell VS8521 Installation Instructions Manual

Ventfree millivolt gas valve
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APPLICATION
The VS8521 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: 4610 Btuh at 3.0 in. wc pressure drop.
Pilot is not adjustable.
3/16 in. compression fitting.
Thermocouple Connection: M8 x 1.
Pilot Threads: Metric and UNS.
Ambient Temperature Range: 0°F to 175°F
(-18°C to 79°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: VS8521: 750 mV operator, thermocouple in
ODS pilot burner.
Approvals:
International Approval Services (IAS) Certificate:
C2030022.
European Community (CE) Certificate: Applied for.
® U.S. Registered Trademark
Copyright © 2000 Honeywell •All Rights Reserved
Ventfree Millivolt Gas Valve
INSTALLATION
When Installing this Product...
INSTALLATION INSTRUCTIONS
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.
CAUTION
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect all power supplies before installation.
VS8521
Place Bar Code Here
69- 1223- 1

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Summary of Contents for Honeywell VS8521

  • Page 1 Ventfree Millivolt Gas Valve INSTALLATION INSTRUCTIONS APPLICATION INSTALLATION The VS8521 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 1. Read these instructions carefully. Failure to follow...
  • Page 2 6. Connect pipe to valve inlet and outlet. Use wrench on either side of the pipe outlet. Refer to Fig. 3 IMPORTANT through 5. The VS8521 ventfree valve is not convertible between natural and LP gas. DROP PIPED WARNING...
  • Page 3 VS8521 VENTFREE MILLIVOLT GAS VALVE WIRING INLET WIRING INLET TERMINALS PRESSURE TAP TERMINALS PRESSURE TAP HI/LO OUTLET OUTLET PRESSURE REGULATOR PRESSURE TAP REGULATOR CONTROL KNOB M10926 PRESSURE ADJUSTMENT (UNDER CONTROL CAP SCREW) KNOB M10927 Fig. 3. Top view of gas valve with HI/LO regulator.

  • Page 4: Operation

    GAS VALVE the power unit must drop out before the lighting sequence can begin again. The VS8521 drops out within 30 seconds. 2. To relight the pilot light, follow the steps in the Pilot Gas Lighting Procedure section.
  • Page 5 VS8521 VENTFREE 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 should WARNING match the nameplate. 2. With the main burner operating, check the gas Fire or Explosion Hazard.

  • Page 6: Maintenance

    2. Extinguish pilot flame. The VS8521 pilot gas flow • Consequence of unexpected shutdown—Where the stops within thirty seconds. Pilot gas safety shutoff...

  • Page 7: If Main Burner Does Not Come On With Call For Heat

    VS8521 VENTFREE MILLIVOLT GAS VALVE SERVICE WARNING TO THE APPLIANCE OWNER. FOR YOUR SAFETY, READ WARNING BEFORE LIGHTING APPLIANCE. Fire or Explosion Hazard. Attempted disassembly or repair can cause WARNING property damage, severe injury or death. Do not disassemble the gas valve; it contains no Fire or Explosion Hazard.

  • Page 8: Troubleshooting Guide

    Only a qualified service technician should perform these troubleshooting procedures. Use Fig. 8 and Table 2 as troubleshooting guides for the VS8521. M17511 Fig. 8. Identification of VS8521 terminals for troubleshooting. Table 2. VS8521 Troubleshooting Table. Test Test Title Connect Multimeter Between Terminals...

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