Honeywell VS8521 Installation Instructions Manual Download Page 8 | Manualshive

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Honeywell VS8521 Installation Instructions Manual Download Page 8

69-1223—1 G.R. Rev. 12-00

www.honeywell.com

Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.

Home and Building Control Home and Building Control

Honeywell

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Scarborough, Ontario
M1V 4Z9

TROUBLESHOOTING GUIDE

WARNING

Fire or Explosion Hazard.
Can cause property damage, severe injury
or death.
Only a qualified service technician should
perform these troubleshooting procedures.

Use Fig. 8 and Table 2 as troubleshooting guides for the
VS8521.

Fig. 8. Identification of VS8521

terminals for troubleshooting.

Table 2. VS8521 Troubleshooting Table.

Procedure:

1.

Test A (Coil Resistance): Have thermostat contacts
open and Pilotstat knob turned to OFF. If coil
resistance exceeds 3.6 ohms, replace the valve.

2.

Test B (Thermopile): Have thermostat contacts
open and the pilot lit with Pilotstat knob turned to
PILOT. If the reading is less than 460 mV, replace
th thermopile.

3.

Test C (Thermocouple): Have thermostat contacts
open and pilot lit with Pilotstat knob turned to
PILOT. Reading should be a minimum of 12 mV in
a new ODS pilot burner assembly. If the reading is
less than 12 mV, replace the ODS pilot burner
assembly. The power unit will hold in down to 3
mV. If the output of the thermocouple is less than 3
mV, replace the ODS pilot burner assembly.

4.

Test D (Operator Pull-In): have thermostat contacts
open and pilot lit with Pilotstat knob turned to
PILOT. Close the thermostat contacts. Operator
will pull in with a minimum of 155 mV. Operator
makes audible sound during pull-in. If pull-in does
not occur, replace the valve.

5.

Test E (Resistance System): System resistance
from the remote switch or thermostat and lead
wires should not exceed 1.7 ohms. If resistance is
above 1.7 ohms, reduce the resistance.

TH

TH

TH

TP

TP

TP

TPTH

M17511

Test

Test Title

Connect Multimeter Between Terminals

Set Thermostat Meter Read Should Be

A

Coil Resistance

TP and TH

Open

Maximum of 3.6 ohms.

B

Thermopile

TP and TPTH

Open

Minimum of 460 mV.

C

Thermocouple

Tip (and Ground)

Open

Minimum of 12 mV.

D

Operator Pull-In

TH and TP

Open

Minimum of 155 mV.

E

Resistance System —

Closed

Maximum of 1.7 ohms.

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Summary of Contents for VS8521

Page 1: ...2 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 ins...

Page 2: ... comply with approved standards and practices 1 Use new properly reamed pipe free from chips When tubing is used assure the ends are square deburred and clean All tubing bends must be smooth and without deformation 2 Run pipe or tubing to the valve If tubing is used obtain a tube to pipe coupling to connect the tubing to the valve 3 Install sediment trap in the supply line to the gas valve See Fig...

Page 3: ...nect power supply before making wiring connections to prevent electrical shock or equipment damage 1 Check the power supply rating on the gas valve and make sure it matches the available supply Install the transformer thermostat and other controls as required 2 This valve can be used only in a self generating system 3 Adjust the thermostat heat anticipator to the 0 1A at 750 mV rating stamped on t...

Page 4: ...lve counterclockwise to the PILOT position push the knob down and hold in position The pilot valve opens and allows gas to flow to the pilot burner 2 Push the plunger on the piezo until the pilot burner is lit Hold down the knob until a strong flame is present approximately 60 seconds 3 Release the knob The shaft will move upward and engage the safety valve lever that opens the safety valve 4 Turn...

Page 5: ...ner HI LO Manually adjusts outlet pressure NOTE Valves are shipped with the gas control knob in the ON position Perform Gas Leak Test WARNING Fire or Explosion Hazard Can cause property damage severe injury or death Stand away from the main burner while lighting Hidden gas leaks can cause flashbacks in the appliance vestibule Check for gas leaks with rich soap and water solution any time work is d...

Page 6: ...perly MAINTENANCE WARNING Fire or Explosion Hazard Can cause property damage severe injury or death Do not attempt to take apart the gas valve or clean it Improper assembly and cleaning can cause unreliable operation Regular preventive maintenance is important in applications that place a heavy load on system controls such as those used in the commercial cooking and agricultural and industrial ind...

Page 7: ...zard Can cause property damage severe injury or death Exactly follow the instructions for Pre Lighting Checks Pre Lighting Checks 1 Before lighting smell around the appliance area for gas If the appliance uses LP gas be sure to smell next to the floor because LP gas is heavier than air 2 If you smell gas immediately shut off the manual valve in the gas piping to the appliance or on LP at the tank ...

Page 8: ...C Thermocouple Have thermostat contacts open and pilot lit with Pilotstat knob turned to PILOT Reading should be a minimum of 12 mV in a new ODS pilot burner assembly If the reading is less than 12 mV replace the ODS pilot burner assembly The power unit will hold in down to 3 mV If the output of the thermocouple is less than 3 mV replace the ODS pilot burner assembly 4 Test D Operator Pull In have...

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