resideo VR8300A,C Continuous Pilot Combination Gas Control Installation Guide

: June 7, 2024
: resideo

Table of Contents

VR8300A,C Continuous Pilot Combination Gas Control
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VR8300A,C Continuous Pilot Combination Gas Control

APPLICATION
These continuous pilot gas controls are used in gasfired appliances with capacities up to 200 feet3/hour at 1 inch wc pressure drop [5.7 meters3/hour at 0.25 kPa] on natural gas. They include a manual valve, safety shutoff, two automatic operators, and a pressure regulator. See Table 1 for temperature range and regulator type.
The VR8300 setup for natural gas includes a 393691 LP Conversion Kit. The kit contains a cap screw, a pressure regulator adjustment screw, a tapered spring and a conversion label.
Capacity:

INSTALLATION INSTRUCTIONS
Body Pattern: Straight-through body pattern.
Inlet x Outlet Sizes Available: 1/2 x 1/2 inch, 1/2 x 3/4 inch, and 3/4 x 3/4 inch (factory-installed inlet flange).
Adapters: Adapters available for 1/2 and 3/4 inch straight and angle connections. Refer to Table 2.
Electrical Ratings: Voltage and Frequency: 24 Vac, 50/60 Hz. Current Draw: 0.70A.

Size (Inlet x Capacity (at 1 inch wc pressure

Outlet)

drop)a

Minimum Regulated Capacity

Maximum Regulated Capacity

1/2 x 1/2 180 feet3/hour [5.1 meter3/hour] 30 feet3/hour [0.8 meter3/hour] 225 feet3/hour [6.4 meter3/hour]

1/2 x 3/4 190 feet3/hour [5.4 meter3/hour] 30 feet3/hour [0.8 meter3/hour] 290 feet3/hour [8.2 meter3/hour]

3/4 x 3/4 200 feet3/hour [5.7 meter3/hour] 30 feet3/hour 0.8 meter3/hour] 300 feet3/hour [8.5 meter3/hour]

a Capacity based on 1000 Btu/feet3, 0.64 specific gravity natural gas at 1 inch wc pressure drop [37.3 MJ/meter3, 0.64 specific gravity natural gas at 0.25 kPa pressure drop].

Use conversion factors in Table 3 to convert capacities for other gases.

NOTE: Flange Kits include one flange with attached Oring and four mounting screws.

Table 1. Temperature Ranges And Regulator Types.

Model Number VR8300A
VR8300C

Ambient Temperature Range

Regulator Type

0° F to 175° F [-18° C to +79° C]

Standard-opening

0° F to 175° F [-18° C to +79° C]

Step-opening

Table 3. Gas Capacity Conversion Factors.

Gas Manufactured Mixed Propane

Multiply Listed Specific Gravity Capacity By

0.60

0.516

0.70

0.765

1.53

1.62

Table 2. 3-Adapter (Flange) Part Numbers.

Inlet/Outlet Pipe Size 1/2 inch NPT
3/4 inch NPT

Part Number

Without Hex With Hex

Flange Type Wrench

Wrench

Straight 394599-6 393690-16

Elbow

394599-3 393690-13

Straight 394599-4 393690-14

Elbow

394599-5 393690-15

Approvals: American Gas Association design certificate: UP-70-69A. Canadian Gas Association design certificate: UP-70-69A. Australian Gas Association design certificate: 4717.

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INSTALL ATION
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. Ensure installer is a trained, experienced service technician.
4. After installation is complete, use these instructions to check out product operation.
WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death. Follow these warnings exactly: 1. Disconnect power supply before wiring to
prevent electrical shock or equipment damage. 2. To avoid dangerous accumulation of fuel gas,
turn off gas supply at the appliance service valve before starting installation, and perform Gas Leak Test after completion of installation. 3. Do not bend pilot tubing at gas control or pilot burner after compression fitting has been tightened, or gas leakage at the connection may result. 4. Always install sediment trap in gas supply line to prevent contamination of gas control. 5. Do not force the gas control knob. Use only your hand to turn the gas control knob. Never use any tools. If the gas control knob will not operate by hand, call a qualified service technician to replace the gas control. Force or attempted repair can result in fire or explosion.
CAUTION
Never apply a jumper across or short the valve coil terminals. This may burn out the heat anticipator in the thermostat.
IMPORTANT:
These gas controls are shipped with protective seals over inlet and outlet tappings. Do not remove seals until ready to connect piping.
Follow the appliance manufacturer instructions if available; otherwise, use the instructions provided below.

VR8300A gas control. To convert from LP to natural gas, use the 394588 Natural Gas Conversion Kit (order separately). VR8300C gas controls cannot be converted.
To convert control from one gas to another: 1. Turn off main gas supply to the appliance. 2. Remove the regulator cap screw and pressure regulator adjusting screw. See Fig. 1.

PRESSURE REGULATOR ADJUSTMENT (UNDER CAP SCREW)
INLET PRESSURE TAP
INLET

WIRING TERMINALS (3)
OUTLET PRESSURE TAP
OUTLET

RED RESET BUTTON

GAS CONTROL KNOB

PILOT OUTLET
PILOT ADJUSTMENT (UNDER CAP SCREW)
M1639C

Fig. 1. Top view of gas control.

3. Remove the existing spring. 4. Insert the replacement spring with tapered end
down. See Fig. 2. 5. Install the new plastic pressure regulator adjust-
ment screw so that the top of the screw is flush (level) with the top of the regulator. Turn the pressure regulator adjustment screw clockwise six complete turns. This provides preliminary pressure setting of about 10.o in. wc [2.5 kPa] for LP regulator and 3.5 in. wc [0.9 kPa] for natural gas regulator. 6. Check the regulator setting either with a manometer or by clocking the gas meter. Refer to Start-Up and Checkout, page 5. 7. Install the new cap screw. 8. Mount conversion label on control. 9. Install control and appliance according to appliance manufacturer’s instructions.

COLOR CODE FOR

LP GAS

NATURAL GAS

CAP SCREW BLACK SILVER

PRESSURE

REGULATOR ADJUSTING

WHITE

SCREW

SPRING

RED

WHITE
STAINLESS STEEL

Converting Between Natural and LP Gas
WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death.

Do not use a gas control set for natural gas on
LP gas or a gas control set for LP gas on natural gas. 2. When making conversion, main and pilot burner orifices MUST be changed to meet appliance manufacturer specifications. VR8300A gas controls may be converted from one gas to another. To convert from natural gas to LP, use the 393691 LP Conversion Kit that is included with the

PRESSURE REGULATOR HOUSING
M8083A
Fig. 2. Installation of conversion kit in regulated gas control.

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VR8300A,C CONTINUOUS PILOT COMBINATION GAS CONTROL

Install Bushings to Gas Control
If adapters are to be installed on the gas control, mount them as follows:
Bushings 1. Remove seal over gas control inlet or outlet. 2. Apply moderate amount of good quality pipe compound to bushing, leaving two end threads bare. On LP installation, use compound resistant to LP gas. Do NOT use Teflon tape. 3. Insert bushing in gas control and carefully thread pipe into the bushing until tight.
Complete instructions below for piping, installing control, connecting pilot tubing, thermocouple and wiring. Make certain the leak test you perform on the control after completing the installation includes leak testing the adapters and screws. If you use a wrench on the valve after flanges are installed, use the wrench only on the flange, not on the control.
Using Adapters to Solve Swing Radius Problems
In some field service applications, it is difficult or impossible to thread the gas control onto the gas supply pipe because of space limitations. This problem can be resolved in many instances by using an adapter. The adapter is installed on the end of the supply pipe in place of the gas control, following the same precautions and instructions that are used for installing the gas control. After the adapter is installed, the gas control is attached to the adapter as outlined above. Note that using an adapter increases the overall length of the gas control.
Choose Gas Control Location
Do not locate the gas control where it can be affected by steam cleaning, high humidity, dripping water, corrosive chemicals, dust or grease accumulation, or excessive heat.
To ensure proper operation, follow these guidelines: · Locate gas control in a well-ventilated area. · Mount gas control high enough above the cabinet
bottom to avoid exposure to flooding or splashing water. · Ensure the ambient temperature does not exceed the ambient temperature ratings for each component. · Cover gas control when the appliance is cleaned with water, steam, or chemicals or to avoid dust and grease accumulation. · Avoid locating gas control where exposure to corrosive chemical fumes or dripping water is possible.
Locate the gas control in the appliance vestibule on the gas manifold. In replacement applications, locate the gas control in the same location as the old gas control.
Install Piping to Gas Control
All piping must comply with applicable codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1 NFPA No. 54), whichever applies. Be sure tubing installation complies with approved standards and practices.

1. Use new, properly reamed pipe free from chips. If tubing is used, ensure the ends are square, deburred and clean. All tubing bends must be smooth and without deformation.
2. Run pipe or tubing to the gas control. If tubing is used, obtain a tube- to-pipe coupling to connect the tubing to the gas control.
3. Install sediment trap in the supply line to the gas control. See Fig. 3.
Install Gas Control

DROP HORIZONTAL

PIPED GAS SUPPLY

GAS CONTROL
3 IN. (76 MM) MINIMUM
2

DROP HORIZONTAL
1

TUBING GAS SUPPLY

GAS CONTROL
RISER PIPED GAS SUPPLY
3 IN. (76 MM) MINIMUM 2

RISER
3 IN. (76 MM) MINIMUM

GAS CONTROL
2

1 ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH.
2 CAUTION: SHUT OFF THE MAIN GAS SUPPLY BEFORE REMOVING END CAP TO PREVENT GAS FROM FILLING THE WORK AREA. TEST FOR GAS LEAKAGE WHEN INSTALLATION IS COMPLETE. M3077C
Fig. 3. Install sediment trap.

TWO IMPERFECT

THREADS

GAS CONTROL

PIPE

THREAD PIPE THE AMOUNT SHOWN IN TABLE FOR INSERTION INTO GAS CONTROL

APPLY A MODERATE AMOUNT OF PIPE COMPOUND TO PIPE ONLY (LEAVE TWO END THREADS BARE).
M3075D

Fig. 4. Use moderate amount of pipe compound.

1. Mount the gas control 0-90 degrees, in any direction including vertically, from the upright position of the gas control knob.
2. Mount the gas control so gas flow is in the direction of the arrow on the bottom of the gas control.
3. Thread pipe the amount shown in Table 4 for insertion into gas control. DO NOT THREAD PIPE TOO FAR. Valve distortion or malfunction may result if the pipe is inserted too deeply into the gas control. Refer to Fig. 4.

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VR8300A,C CONTINUOUS PILOT COMBINATION GAS CONTROL

Table 4. NPT pipe thread length in (in.).

Thread Pipe Maximum Depth Pipe can Pipe Size this Amount be Inserted into Control

3/8

9/16

3/8

1/2

3/4

1/2

3/4

13/16

3/4

4. Apply a moderate amount of good quality pipe compound (DO NOT use Teflon tape) to pipe only, leaving two end threads bare. On LP installations, use compound resistant to LP gas.
5. Remove seals over gas control inlet and outlet if necessary.
6. Connect pipe to gas control inlet and outlet. Use wrench on the square ends of the gas control. If an adapter is used, place wrench on adapter rather than gas control. Refer to Fig. 1 and 5.

3. Unscrew compression fitting from the pilot outlet (Fig. 1). Slip the compression fitting over the tubing and slide out of the way.

NOTE:

When replacing a gas control, cut off old compression fitting and replace with the new compression fitting provided on the gas control. Never use the old compression fitting as it may not provide a gas-tight seal.

4. Push tubing into the pilot gas tapping on the outlet end of the control until it bottoms. While holding tubing all the way in, slide compression fitting into place and engage threads–turn until finger tight. Then tighten one more turn with wrench. Do not overtighten. Refer to Fig. 6.
5. Connect other end of tubing to pilot burner according to pilot burner manufacturer’s instructions.

GAS CONTROL
TIGHTEN NUT ONE TURN BEYOND FINGER-TIGHT.

TO PILOT BURNER

FITTING BREAKS OFF AND CLINCHES TUBING AS NUT IS TIGHTENED.

M3076B

Fig. 6. Always use new compression fitting.

APPLY WRENCH TO FLANGE ONLY

THERMOCOUPLE LEAD
1

M16012A

ECO CONNECTOR

Fig. 5. Proper use of wrench on gas control.

Connect Pilot Gas Tubing
1. Cut tubing to desired length and bend as necessary for routing to pilot burner. Do not make sharp bends or deform the tubing. Do not bend tubing at gas control or pilot burner after compression fitting has been tightened, as this may result in gas leakage at the connection.
2. Square off and remove burrs from end of tubing.

1 THIS IS AN ELECTRICAL CONNECTION AND MUST BE CLEAN AND DRY. DO NOT USE PIPE COMPOUND. M3095C
Fig. 7. Installing thermocouple and optional ECO connector to the power unit.

Table 5. Maximum Length of Supplementary Limit Leadwires When Using Q340A Thermocouple.

Thermocouple Length

inches

meters

18

0.5

24

0.6

30

0.8

36

0.9

48

1.2

60

1.5

Maximum Leadwire Length x 2 (wires)

AWG No. 14

AWG No. 16

AWG No. 18

inches

meters

inches

meters

inches

meters

35

0.9

22

0.6

13

0.3

29

0.7

18

0.5

11

0.3

23

0.6

15

0.4

9

0.2

17

0.4

11

0.3

6

0.2

DO NOT USE.

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VR8300A,C CONTINUOUS PILOT COMBINATION GAS CONTROL

Table 6. Maximum Length of Supplementary Limit Leadwires When Using Q309/Q390 Thermocouple.

Thermocouple Length

inches

meters

12

0.3

18

0.5

24

0.6

30

0.8

36

0.9

40

1.0

48

1.2

60

1.5

Maximum Leadwire Length x 2 (wires)

AWG No. 14

AWG No. 16

AWG No. 18

inches

meters

inches

meters

inches

meters

47

1.2

30

0.8

18

0.5

41

1.0

26

0.7

16

0.4

35

0.9

22

0.6

14

0.4

29

0.8

15

0.5

11

0.3

23

0.6

15

0.4

9

0.2

19

0.5

12

0.3

7

0.2

11

0.3

7

0.2

DO NOT USE.

Connect Thermocouple
If a supplementary limit or energy cutoff (ECO) is used, insert the ECO connector (order part no. 394332) as shown in Fig. 7, and then connect thermocouple lead. Otherwise, insert thermocouple lead directly. This is an electrical connection and must be clean and dry. Never use pipe compound. Tighten only 1/4 turn beyond finger tight to give good electrical continuity. DO NOT OVERTIGHTEN.

24V THERMOSTAT
4

OPTIONAL CONVENIENCE TERMINALS
3

TH/TR

HIGH LIMIT CONTROLLER

L1 (HOT)
L2 1

TH

2

TR GAS CONTROL

TERMINALS

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

2 DO NOT JUMPER THESE TERMINALS. THIS SHORTS VALVE COIL AND CAN BURN OUT ANTICIPATOR IN THERMOSTAT.

3 CONVENIENCE TERMINALS SERVE ONLY AS A TIE POINT. THEY ARE NOT INTERNALLY WIRED TO THE CONTROL CIRCUIT OR TO GROUND.

4 OPTIONAL HIGH LIMIT.

M2915C

Fig. 8. Wiring connections for 24 volt control.

WIRING
Follow the wiring instructions furnished by the appliance manufacturer, if available, or use the general instructions provided below. Refer to Table 5 or 6.
All wiring must comply with applicable electrical codes and ordinances.
Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.
1. Check the power supply rating on the gas control and ensure it matches the available supply. Install transformer, thermostat, and other controls as required.
2. Connect control circuit to gas control terminals. See Fig. 1 and Fig. 8.
3. Adjust thermostat heat anticipator to 0.70 rating stamped on valve operator.

STARTUP AND CHECKOUT
WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death.

Do not force the gas control knob. Use only
your hand to turn the gas control knob. Never use any tools. 2. If the gas control knob or reset button will not operate by hand, or if the reset button stays depressed after it is released, the gas control should be replaced by a qualified service technician.
Gas Control Knob Settings
The gas control knob has three settings:
OFF: Prevents gas flow to main burner.
PILOT: Permits pilot gas flow only. Gas control knob must be held depressed or thermocouple must be heated sufficiently to hold the safety control valve open.
ON: Permits main burner and pilot gas flow. Thermostat and gas control control main burner gas flow.
NOTE: Gas controls 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. Check for gas leaks with rich soap and water solution anytime work is done on a gas control.
Gas Leak Test
1. Paint all pipe connections upstream of the gas control with a rich soap and water solution. Bubbles indicate a gas leak.
2. If a gas leak is detected, tighten the pipe connection.
3. Stand clear while lighting main burner to prevent injury caused from hidden gas leaks that could cause flashback in the appliance vestibule. Light the main burner.

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VR8300A,C CONTINUOUS PILOT COMBINATION GAS CONTROL

4. With the main burner in operation, paint all pipe joints (including flanges) and gas control inlet and outlet with rich soap and water solution.
5. If another gas leak is detected, tighten flange screws, joints, and pipe connections.
6. Replace the part if gas leak can not be stopped.

Light the Pilot Burner Flame

1. Turn the gas control knob clockwise

to OFF.

Wait five minutes to dissipate any unburned gas.

Sniff around the appliance near the floor. Do not

relight the pilot flame if you smell gas.

2. Turn the gas control knob counterclockwise

to PILOT. Push down and hold the gas control knob

while lighting the pilot flame.

3. Hold the gas control knob down about one minute,

then release.

· If the pilot flame goes out, turn the gas control

knob clockwise

to OFF and repeat steps 1

through 3.

· If pilot flame remains lit, turn the gas control

knob counterclockwise

to ON.

Adjust the Pilot Burner Flame
The pilot flame should envelop 3/8 to 1/2 inch [10 to 13 millimeters] of the thermocouple tip. Refer to Fig. 9. To adjust the pilot flame:

1. Remove the pilot adjustment cover screw. Refer to

Fig. 1.

2. Turn the inner adjustment screw clockwise

to

decrease or counterclockwise

to increase the

pilot flame.

PROPER FLAME ADJUSTMENT

3/8 TO 1/2 IN. (10 TO 13 MM)

THERMOCOUPLE
M3086C
Fig. 9. Proper flame adjustment.

3. Always replace the cover screw after adjustment and tighten firmly to ensure proper operation.
Light Main Burner
Follow the appliance manufacturer’s instructions or set the thermostat setting above room temperature to call for heat.
Check and Adjust Gas Input to Main Burner
CAUTION
1. Do not exceed the input rating stamped on the appliance nameplate, or manufacturer’s recommended burner orifice pressure for the size orifice used. Ensure the main burner primary air supply is properly adjusted for complete combustion (refer to the appliance manufacturer’s instructions).
2. IF CHECKING GAS INPUT BY CLOCKING THE GAS METER: · Ensure that the only gas flow through the meter is that of the appliance being tested. · Ensure that other appliances are turned off and that their pilot burners are extinguished (or deduct their gas consumptions from the meter reading). · Convert the flow rate to Btuh as described in the Gas Controls Handbook (form number 70-2602) and compare to the Btuh input rating on the appliance nameplate.
3. IF CHECKING GAS INPUT WITH A MANOMETER (PRESSURE GAUGE): · Ensure the gas control knob is in the PILOT position before removing the outlet pressure tap plug to connect the manometer. · Turn the gas control knob back to PILOT when removing the manometer and replacing outlet pressure tap plug. · Shut off the gas supply at the appliance service valve or, for LP gas, at the gas tank before removing outlet the pressure tap plug and before disconnecting the manometer and replacing the outlet pressure tap plug. · Perform the Gas Leak Test at the inlet pressure tap plug.

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Table 7. Pressure Regulator Specification Pressures in Inches WC.

Outlet Pressure

Model

Nominal Inlet Nominal Factory Outlet Setting Adjustment Setting Range

Type of Gas Pressure Range Step

Full Rate

Step

Full Rate

Standard-, Slow-opening Natural

5.0 – 7.0

—

3.5

—

3.0 – 5.0

LP

12.0 – 14.0

—

10.0

—

8.0 – 12.0

Step-opening

Natural

5.0 – 7.0

0.9

3.5

—

3.0 – 5.0

LP

12.0 – 14.0

2.2

10.0

—

8.0 – 12.0

Table 8. Pressure Regulator Specification Pressures in kPa.

Outlet Pressure

Model

Nominal Inlet Nominal Factory Outlet Setting Adjustment Setting Range

Type of Gas Pressure Range Step

Full Rate

Step

Full Rate

Standard-, Slow-opening Natural

1.2 – 1.7

—

0.9

—

0.7 – 1.2

LP

2.9 – 3.9

—

2.7

—

2.0 – 3.0

Step-opening

Natural

1.2 – 1.7

0.2

0.9

—

0.7 – 1.2

LP

2.9 – 3.9

0.9

2.7

—

2.0 – 3.0

Standard-Opening and Slow-Opening

Pressure Regulator

1. The gas control outlet pressure should match the

manifold pressure listed on the appliance name-

plate.

2. With the main burner operating, check the gas con-

trol flow rate by using the meter clocking method

or check the gas pressure using a manometer con-

nected to the gas control outlet pressure tap. Refer

to Fig. 1.

3. If necessary, adjust the pressure regulator to

match the appliance rating. Refer to Table 7 or 8 for

the factory set nominal outlet pressures and

adjustment setting ranges.

a. Remove the pressure regulator adjustment cap

screw.

b. Using a screwdriver, turn the inner adjustment

screw clockwise

to increase or counter-

clockwise

to decrease the main burner

gas pressure.

c. Always replace the cap screw and tighten

firmly to safeguard proper operation.

4. If the desired outlet gas pressure or gas flow rate

can not be achieved by adjusting the gas control,

check the gas control inlet pressure by using a

manometer at the inlet pressure tap. If the inlet

pressure is in the normal range (refer to Table 7 or

8), replace the gas control. Otherwise, take the nec-

essary steps to provide proper gas pressure to the

gas control.

3. If necessary, adjust the pressure regulator to

match the appliance rating. Refer to Table 7 or 8 for

factory set nominal outlet pressures and adjust-

ment ranges.

a. Remove the pressure regulator adjustment cap

screw.

b. Using a screwdriver, turn the inner adjustment

screw clockwise

to increase or counter-

clockwise

to decrease the main burner

gas pressure.

c. Always replace the cap screw and tighten

firmly to safeguard proper operation.

4. If desired outlet pressure or flow rate cannot be

achieved by adjusting the gas control, check the

inlet pressure by using a manometer at inlet pres-

sure tap or upstream of the gas control. If the inlet

pressure is in the normal range (refer to Table 7 or

8), replace the existing gas control. Otherwise, take

the necessary steps to provide proper gas pressure

to the gas control.

5. Carefully check main burner lightoff at the step

pressure. Make sure the main burner lights

smoothly and without flashback to the orifice and

that all ports remain lit. Cycle the main burner sev-

eral times, allowing at least 30 seconds between

cycles for the regulator to resume the step func-

tion. Repeat after allowing main burner to cool.

Readjust the full rate outlet pressure, if necessary,

to improve lightoff characteristics.

Check Safety Shutdown Performance

Step-Opening Pressure Regulator
1. The gas control outlet pressure should match the manifold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas control flow rate by using the meter clocking method or check the gas pressure by using a manometer connected to the gas control outlet pressure tap. Refer to Fig. 1.

WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death. Perform the safety shutdown test anytime work is done on a gas system.
1. Place gas control knob in PILOT position. Main burner should go off and pilot should remain lit.
2. Extinguish pilot flame. Pilot gas flow should stop within 2-1/2 minutes. Safety shutoff of pilot gas proves complete shutdown since safety shutoff valve prevents main burner and pilot gas flow.

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3. Relight pilot burner and operate system through one complete cycle to ensure all controls operate properly.
MAINTENANCE

CAUTION
Do not apply a jumper across or short the valve coil terminals. This may burn out the heat anticipator in the thermostat.

WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death. Improper cleaning or reassembly can cause gas leakage. When cleaning, be sure that the control is reassembled properly and perform gas leak test.
Regular preventive maintenance is important in applications such as commercial cooking, agricultural and industrial operations that place a heavy load on system controls because: · In many such applications, particularly commercial
cooking, the equipment operates 100,000 to 200,000 cycles per year. Such heavy cycling can wear out the gas control in one to two years. · Exposure to water, dirt, chemicals and heat can damage the gas control and shut down the control system.
The maintenance program should include regular checkout of the gas control; see Startup and Checkout page 5, and the control system, see the appliance manufacturer’s literature.
Maintenance frequency must be determined individually for each application. Some considerations are: · Cycling frequency. Appliances that may cycle 100,000
times annually should be checked monthly. · Intermittent use. Appliances that are used seasonally
should be checked before shutdown and again before the next use. · Consequence of unexpected shutdown. Where the cost of an unexpected shutdown would be high, the system should be checked more often. · Dusty, wet, or corrosive environment. Since these environments can cause the gas control to deteriorate more rapidly, the system should be checked more often. The gas control should be replaced if: · It does not perform properly on checkout or troubleshooting. · The gas control knob is hard to turn or push down, or it fails to pop back up when released. · The gas control is likely to have operated for more than 200,000 cycles.
SERVICE
WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death. Do not disassemble the gas control; it contains no replaceable components. Attempted disassembly or repair can damage the gas control.

IMPORTANT:
Allow 60 seconds after shutdown before reenergizing step-opening model to assure lightoff at step pressure.
If the Pilot Burner Flame Will not Light
1. Ensure the main gas supply valve is open and the pilot gas supply line is purged of air.
2. Attempt to light pilot burner flame following procedures in Light the Pilot Burner Flame, page 6. If pilot burner flame still will not light: a. Check the pilot gas adjustment screw. If closed, readjust the pilot flame. Refer to Adjust the Pilot Burner Flame, page 6. b. Perform the Gas Leak Test at the compression fitting. If a gas leak is detected, replace the old compression fitting or tighten the newly installed one. Refer to Fig. 1. c. Ensure that the pilot burner tubing or pilot burner orifice is not clogged.
If the Pilot Burner Flame goes out when
the Gas Control Knob is Released
1. Ensure the gas control knob is held in at least one minute to allow the thermocouple time to heat.
2. Check the pilot burner flame adjustment. Refer to Adjust the Pilot Burner Flame, page 6.
3. Check the wiring between the thermocouple and the gas control valve operator.
4. Ensure thermocouple connection to the power unit is tightened 1/4 turn beyond finger tight.
5. If pilot burner flame still goes out, measure the open and closed thermocouple output voltage. Compare it to the acceptable range charts in the thermocouple specifications or in the Gas Controls Handbook. Replace the thermocouple if voltages are outside the acceptable range.
6. Check the power unit resistance. If higher than 11 ohms, replace the gas control.
If the Main Burner Will not Come On with a
Call for Heat
1. Ensure the gas control knob is in the ON position. 2. Adjust the thermostat several degrees above room
temperature. 3. Use an ac voltmeter to measure the voltage across
terminals TH and TR. If: a. No voltage is present, check the control circuit
for proper operation. b. 24 Vac is present, but first operator did not
click open, check for excessive inlet gas pressure. If inlet gas pressure is correct, replace the gas control. 4. Measure the open and closed thermocouple output voltages and compare to the acceptable range charts in the thermocouple specifications or in the Gas Controls Handbook. Replace the thermocouple if voltages are outside the acceptable range.

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VR8300A,C CONTINUOUS PILOT COMBINATION GAS CONTROL

If the Main Burner is Overfiring
Adjust the gas control pressure regulator to the correct pressure. If the regulator cannot be adjusted and supply pressure is in the normal range, replace the gas control.
Instructions To The Homeowner
WARNING
Fire or Explosion Hazard Can cause property damage, severe injury, or death. Follow these warnings exactly: 1. Pilot burner flame must be lit manually. Follow
these instructions exactly. 2. Before lighting pilot burner flame, smell around
the appliance for gas. Be sure to smell next to floor because LP gas is heavier than air. 3. IF YOU SMELL GAS: · Turn off the gas supply at the appliance
service valve. On LP gas systems, turn off gas supply at the gas tank. · Do not light any appliances in the house. · Do not touch electrical switches or use the phone. · Leave the building and use a neighbor’s phone to call your gas supplier. · If you can not reach your gas supplier, call the fire department. 4. Do not force the gas control knob. Use only your hand to push down or turn the gas control knob. Never use any tools. If the gas control knob will not operate by hand, call a qualified service technician to replace the gas control. Force or attempted repair may result in a fire or explosion. 5. The gas control must be replaced in case of any physical damage, tampering, bent terminals, missing or broken parts, stripped threads, or evidence of exposure to heat.
IMPORTANT:
Follow the operating instructions provided by the manufacturer of your heating appliance. The information below will be of assistance in a typical gas control application, but the specific controls used and the procedures outlined by the manufacturer of your appliance may differ and require special instructions.

Lighting the Pilot Burner Flame

STOP: Read the Warnings Above

The pilot burner flame must be lit manually. If the pilot

burner flame has gone out, follow these instructions

exactly.

1. Set the thermostat to its lowest setting.

2. Disconnect all electric power to the appliance.

3. Remove the gas control access panel.

4. Push in the gas control knob slightly and turn

clockwise

to OFF.

NOTE: The gas control knob can not be turned from PILOT to OFF unless it is pushed in slightly. Do not force the gas control knob.

5. Wait five minutes to clear out any unburned gas. If you then smell gas, STOP! Follow item 3 in the Warnings, page 9. If you do not smell gas, continue with the next step.
6. Remove the pilot burner access panel located below and behind the gas control.
7. Find the pilot burner by following the metal tube from the gas control. The pilot burner is between the two burner tubes behind the pilot burner access panel.
8. Turn the gas control knob counterclockwise to PILOT.
9. Push and hold the gas control knob all the way in. Immediately light the pilot burner flame with a match and continue holding the gas control knob in for one minute after the pilot burner flame is lit.
10. Release the gas control knob and it will pop back up.The pilot burner flame should remain lit. If pilot burner flame goes out, repeat steps one through ten. · If the gas control knob does not pop up when released, stop immediately and call your service technician or gas supplier. · If the pilot flame will not stay lit after several tries, turn the gas control knob to OFF and call your service technician or gas supplier.
11. Turn the gas control knob counterclockwise to ON.
12. Replace the pilot burner access panel. 13. Replace the gas control access panel. 14. Reconnect all electric power to the appliance. 15. Set the thermostat to the desired setting.

Turning Off the Appliance
VACATION SHUTDOWN: Set the thermostat to the desired room temperature while you are away.

COMPLETE SHUTDOWN: Push in the gas control knob

slightly and turn clockwise

to OFF. Do not force.

Appliance will completely shut off. Follow the

Instructions to the Homeowner above to resume normal

operation.

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