resideo VR4300 User manual

INSTALLATION INSTRUCTIONS
69-0683-02
VR4300 Continuous Pilot
Combination Gas Control
APPLICATION
These continuous pilot gas controls are used in gas-
fired appliances with capacities up to 300 feet3/hour at
one 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, a pressure regulator, pilot
adjustment, and a conduit cover. See Table 1 for
temperature ranges and regulator types.
BODY PATTERN: Straight-through body pattern.
INLET X OUTLET SIZES AVAILABLE: 1/2 by 3/4 inch and
3/4 by 3/4 inch.
ADAPTERS: Adapters available for 1/2 and 3/4 inch
straight and angle connections. Refer to Table 2.
ELECTRICAL RATINGS:
Voltage and Frequency: 120 Vac, 60 Hz.
Current Draw: 0.14A.
Use conversion factors in Table 3 to convert capacities
for other gases.
CAPACITY
aCapacity 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].
NOTE: Flange kits include one flange with attached O-
ring and fan mounting screw.
Inlet x Outlet
Size (In.)
Capacity at 1 inch wc
Pressure DropaMinimum 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]
Table 1. Temperature Ranges and Regulator Types
Model
Number
Ambient
Temperature
Range Regulator Type
VR4300A 0°F to 175°F
[-18°C to +79°C]
Standard-opening
VR4300C 0°F to 175°F
[-18°C to +79°C]
Step-opening
VR4300H 0°F to 175°F
[-18°C to +79°C]
Slow-opening
VR4300M -40°F to 175°F
[-40°C to +79°C]
Standard-opening
VR4300P -40°F to 175°F
[-40°C to +79°C]
Step-opening
Table 2. Adapter (Flange) Part Numbers
Inlet/Outlet
Pipe Size
Flange
Type
Part Number
Without Hex
Wrench
With Hex
Wrench
1/2 inch NPT Straight 393690-6 393690-16
Elbow 393690-3 393690-13
3/4 inch NPT Straight 393690-4 393690-14
Elbow 393690-5 393690-15

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
69-0683—02 2
APPROVALS:
American Gas Association design certificate: UP-70-
57A.
Canadian Gas Association design certificate: 1029-CC-
8375.
INSTALLATION
WHEN INSTALLING THIS
PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to assure the product is suitable for
your application.
3. Assure installer is a trained, experienced service
technician.
4. After installation is complete, use these instruc-
tions 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 because gas leakage at the
connection can 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 push down the reset button or
turn the gas control knob. Never use any tools.
If the gas control knob or reset button will not
operate by hand, replace the gas control using
a qualified service technician. 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:
1. These gas controls are shipped with protective
seals over inlet and outlet tappings. Do not remove
seals until ready to connect piping.
2. When a gas control is installed external to the
appliance, a conduit cover MUST be installed.
Make sure that conduit cover is placed over the
flange before rotating conduit cover into position.
Follow the appliance manufacturer’s instructions if
available; otherwise, use the instructions provided below.
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.
To convert a gas control from natural gas to LP gas or
from LP gas to natural gas, contact your Resideo
representative.
Convert standard- or slow-opening gas controls from
one gas to another with a conversion kit (ordered
separately). Order part number 393691 to convert from
natural to LP gas. Order part number 394588 to convert
from LP to natural gas. Step-opening gas controls
cannot be converted.
INSTALL ADAPTERS TO CONTROL
If adapters are to be installed on the gas control, mount
them as follows:
Flanges
1. Choose the appropriate flange for your application.
2. Remove seal over gas control inlet or outlet.
3. Assure the O-ring is fitted in the groove of flange. If
the O-ring is not attached or is missing, do not use
flange.
4. With O-ring facing gas control, align the screw
holes on the gas control with the holes in the
flange. Insert and tighten the screws provided with
the flange. See Fig.1. Tighten the screws to 25 inch
pounds of torque to provide a gas-tight seal.
Bushings
1. Remove seal over gas control inlet or outlet.
2. Apply moderate amount of good quality pipe com-
pound 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 thread pipe care-
fully into bushing until tight.
Complete instructions below for piping, installing
gas 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 on only the flange, not on
the control.
Table 3. Gas Capacity Conversion Factors
Gas Specific Gravity
Multiply Listed
Capacity By
Manufactured 0.60 0.516
Mixed 0.70 0.765
Propane 1.53 1.62

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
369-0683—02
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 applications by using an adapter. Install
the adapter on the end of the supply pipe in place of the
gas control by following the same precautions and
instructions that are used for installing the gas control.
After the adapter is installed, attach the gas control to
the adapter as outlined above. Note that using an
adapter increases the overall length of the gas control.
Fig. 1. Install flange to gas control
LOCATION
Mount the combination gas control in the appliance
vestibule on the gas manifold. If this is a replacement
application, mount the gas control in the same location
as the old control.
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 assure 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.
• Assure the ambient temperature does not exceed the
ambient temperature ratings for each component.
• Cover gas control if 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.
Install Piping to Gas Control
All piping must comply with local codes and ordinances
or with the National Fuel Gas Code (ANSI Z223.1 NFPA
No. 54), whichever applies. Tubing installation must
comply with approved standards and practices.
1. Use new, properly reamed pipe free from chips. If
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 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. 2.
Install Gas Control
1. Mount the gas control 0-90 degrees, in any direc-
tion including vertically, from the upright position
of the gas control knob.
2. Mount the gas control so gas flow is in the direc-
tion of the arrow on the bottom of the gas control.
3. Thread pipe the amount shown in Table 4 for inser-
tion 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. See
Fig. 3.
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 Figs. 4 and 5.
Fig. 2. Sediment trap installation
M3098A
VALVE OUTLET
FLANGE
9/64 INCH HEX SCREWS (4)
1 DO NOT OVERTIGHTEN SCREWS.
TIGHTEN TO 25 INCH POUNDS.
1
6/32 INCH ROUND
SCREWS (1)
CONDUIT
COVER
Table 4. NPT Pipe Thread Length in in.
Pipe Size
Thread Pipe
This Amount
Maximum Depth Pipe Can
Be Inserted Into Control
3/8 9/16 3/8
1/2 3/4 1/2
3/4 13/16 3/4
GAS
CONTROL
GAS
CONTROL
HORIZONTAL
DROP
PIPED
GAS
SUPPLY
PIPED
GAS
SUPPLY
3 IN.
(76 MM)
MINIMUM
3 IN.
(76 MM)
MINIMUM
RISER
GAS
CONTROL
TUBING
GAS
SUPPLY
HORIZONTAL
DROP
3 IN.
(76 MM)
MINIMUM
RISER
M3077C
2
1
2
2
1
2
ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH.
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.

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
69-0683—02 4
Fig. 3. Use moderate amount of pipe compound
Fig. 4. Top view of gas control
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, because this can result in gas
leakage at the connection.
2. Square off and remove burrs from end of tubing.
3. Unscrew compression fitting from the pilot outlet.
See Fig. 4. Slip the compression fitting over the
tubing and slide out of the way.
Fig. 6. Always use new compression fitting
NOTE: When replacing a gas control, cut off old com-
pression fitting and replace with the new com-
pression fitting provided on the gas control.
Never use the old compression fitting because it
may not provide a gastight 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, engage threads and 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 accord-
ing to pilot burner manufacturer’s instructions.
Connect Thermocouple
Connect thermocouple lead as shown in Fig. 7. Refer to
Tables 5 and 6 for maximum leadwire lengths. 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.
TWO IMPERFECT
THREADS GAS CONTROL
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
PIPE
OUTLET
PRESSURE
TAP
INLET OUTLET
WIRING
TERMINALS (3)
INLET
PRESSURE
TAP
PRESSURE REGULATOR
ADJUSTMENT
(UNDER CAP SCREW)
PILOT OUTLET
PILOT ADJUSTMENT
(UNDER CAP SCREW)
GAS CONTROL
KNOB
RED
RESET BUTTON
M1639C
APPLY WRENCH
FROM TOP OR
BOTTOM OF GAS
CONTROL TO
EITHER SHADED AREA
WHEN FLANGE IS NOT USED
APPLY WRENCH
TO FLANGE ONLY
WHEN FLANGE IS USED
M3083
GAS CONTROL
TIGHTEN NUT ONE TURN
BEYOND FINGER-TIGHT. TO PILOT
BURNER
FITTING BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED. M3076B

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
569-0683—02
WIRING
Follow the wiring instructions furnished by the appliance
manufacturer, if available, or use the general instructions
provided below.
All wiring must comply with applicable electrical codes
and ordinances, including insulated quick connect
terminals.
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 assure it matches the available supply. Install
thermostat and other controls as required.
2. When the gas control is installed external to the
appliance, install the conduit cover on the conduit
fitting. Do not secure conduit cover at this time.
3. Connect control circuit to gas control terminals.
See Figs. 4 and 8.
NOTE: Use leadwires with insulated terminals.
4. Make sure conduit cover is in position and secured
to the gas control with the screw provided. See Fig.
1.
5. Adjust thermostat heat anticipator as instructed in
appliance manual (i.e., usually 0.1A).
Fig. 7. Installing thermocouple to the power unit
Fig. 8. Wiring connections for 120 volt control
1
THERMOCOUPLE
LEAD
1THIS IS AN ELECTRICAL CONECTION AND MUST BE
CLEAN AND DRY. DO NOT USE PIPE COMPOUND.
M3096
120V
THERMOSTAT
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT JUMPER THESE TERMINALS. THIS
SHORTS VALVE COIL AND MAY BURN OUT
ANTICIPATOR IN THERMOSTAT.
OPTIONAL HIGH LIMIT.
L1
(HOT)
L2
HIGH LIMIT
CONTROLLER
M3092B
GAS CONTROL
TERMINALS
L2
L1
1
1
2
2
3
3

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
69-0683—02 6
START-UP AND CHECKOUT
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY, OR DEATH
1. Do not force the gas control knob. Use only
your hand to push down the reset button or
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 pilot and main burner gas flow.
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. Gas control
and thermostat 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 any time 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. Bub-
bles indicate a gas leak.
2. If a gas leak is detected, tighten the pipe connec-
tion.
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.
4. With the main burner in operation, paint all pipe
joints (including adapters) and gas control inlet
and outlet with rich soap and water solution.
5. If another gas leak is detected, tighten adapter
screws, joints, and pipe connections.
6. Replace the part if gas leak cannot 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:
Table 5. Maximum Length of Supplementary Limit Leadwires when using Q340A Thermocouple
Thermocouple Length
Maximum Leadwire Length x 2 (Wires)
AWG No. 14 AWG No. 16 AWG No. 18
Inches Meters Inches Meters Inches Meters Inches Meters
18 0.5 35 0.9 22 0.6 13 0.3
24 0.6 29 0.7 18 0.5 11 0.3
30 0.8 23 0.6 15 0.4 9 0.2
36 0.9 17 0.4 11 0.3 6 0.2
48 1.2 Do not use
60 1.5
Table 6. Maximum Length of Supplementary Limit Leadwires when using Q309A Thermocouple
Thermocouple Length
Maximum Leadwire Length x 2 (Wires)
AWG No. 14 AWG No. 16 AWG No. 18
Inches Meters Inches Meters Inches Meters Inches Meters
12 0.3 47 1.2 30 0.8 18 0.5
18 0.5 41 1.0 26 0.7 16 0.4
24 0.6 35 0.9 22 0.6 14 0.4
30 0.8 29 0.8 18 0.5 11 0.3
36 0.9 23 0.6 15 0.4 9 0.2
40 1.0 19 0.5 12 0.3 7 0.2
48 1.2 11 0.3 7 0.2
60 1.5 Do not use

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
769-0683—02
1. Remove the pilot adjustment cover screw. Refer to
Fig. 5.
2. Turn the inner adjustment screw clockwise to
decrease or counterclockwise to increase the pilot
flame.
3. Always replace the cover screw after adjustment
and tighten firmly to assure proper operation.
Fig. 9. Proper flame adjustment
LIGHT MAIN BURNER
Follow the appliance manufacturer’s instructions or
place 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(s) used. Assure 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:
• Assure that the only gas flow through the meter
is that of the appliance being tested.
• Assure 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 70-2602) and
compare to the Btuh input rating on the
appliance nameplate.
3. IF CHECKING GAS INPUT WITH A MANOMETER
(PRESSURE GAUGE):
• Assure 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 the outlet 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.
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 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. 4.
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 ranges.
a. Remove the pressure regulator adjustment cap
and screw.
b. Using a screwdriver, turn the inner adjustment
screw clockwise to increase or counterclock-
wise to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten
firmly to assure proper operation.
4. If the desired outlet gas pressure or gas flow rate
cannot be achieved by adjusting the gas control,
check the gas control inlet pressure 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.
Step-Opening Pressure Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance name-
plate.
2. With main burner operating, check the gas control
flow rate using the meter clocking method or check
the gas pressure using a manometer connected to
the gas control outlet pressure tap. Refer to Fig. 4.
3. 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 counterclock-
wise to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten
firmly to assure proper operation.
4. If desired outlet pressure or flow rate cannot be
achieved by adjusting the gas control, check the
inlet pressure using a manometer at inlet pressure
tap or upstream of the gas control. If the inlet pres-
sure 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. Assure the main burner lights smoothly
and without flashback to the orifice and that all
ports remain lit. Cycle the main burner several
times, allowing at least 30 seconds between cycles
for the regulator to resume the step function.
Repeat after allowing main burner to cool. Readjust
the full rate outlet pressure if necessary to improve
lightoff characteristics.
M3086C
PROPER FLAME
ADJUSTMENT
3/8 TO 1/2 IN.
(10 TO 13 MM)
THERMOCOUPLE

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
69-0683—02 8
CHECK SAFETY SHUTDOWN PERFORMANCE
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY, OR DEATH
Perform the safety shutdown test any time 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.
3. Relight pilot burner and operate system through
one complete cycle to assure all controls operate
properly.
MAINTENANCE
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY, OR DEATH
Improper cleaning or reassembly may cause gas
leakage. When cleaning, assure that control is
reassembled properly and perform gas leak test.
Regular preventive maintenance is important in
applications that place a heavy load on system controls,
such as in the commercial cooking and agricultural and
industrial industries because:
• In many such applications, particularly commercial
cooking, the equipment operates 100,000-200,000
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 as described in the Start-up
and Checkout section, and the control system as
described in 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 during 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 may damage the gas
control.
CAUTION
Do not apply a jumper across or short the valve
coil terminals. This may burn out the heat
anticipator in the thermostat.
IMPORTANT:
Allow 60 seconds after shutdown before re-
energizing step-opening model to assure ligh-
toff at step pressure.
Table 7. Pressure Regulator Specification Pressures in in.
Model Type of Gas
Nominal Inlet
Pressure
Range
Outlet Pressure
Nominal Factory Setting Setting 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
Model Type of Gas
Nominal Inlet
Pressure
Range
Outlet Pressure
Nominal Factory Setting Setting 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

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
969-0683—02
IF THE PILOT BURNER FLAME WILL NOT LIGHT
1. Assure 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 proce-
dures 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.
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. 4.
c. Assure 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. Assure 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. Assure thermocouple connection to the power unit
is tightened one-fourth 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 above 11 ohms,
replace the gas control.
IF THE MAIN BURNER WILL NOT COME ON WITH A CALL
FOR HEAT
1. Assure 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 L1 and L2:
a. If no voltage is present, check the control cir-
cuit for proper operation.
b. If voltage is present, but first operator did not
click open, check for excessive inlet gas pres-
sure. 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.
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 cannot 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, the gas control
should be replaced by a qualified service
technician. 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 help you in a typical gas
control application, but the specific controls
used and the procedures outlined by the manu-
facturer or your appliance may differ, requiring
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 cannot 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 step 3 in the
Warnings above. 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.

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
69-0683—02 10
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 1 through 10.
• 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 the gas control knob in
slightly and turn clockwise to OFF. Do not force.
Appliance will completely shut off. Follow Lighting the
Pilot Burner Flame procedure above to resume normal
operation.

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
11 69-0683—02

VR4300 CONTINUOUS PILOT COMBINATION GAS CONTROL
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-0683—02 M.S. Rev. 05-20 | Printed in United States