Robertshaw Uni-Kit 720-079 Installation and user guide

INSTALLATION DATA
720-079 UNIVERSAL ELECTRONIC
IGNITION GAS VALVE UNI-KIT®
The Robertshaw® 720-079 Universal Electronic Ignion Gas Valve
Uni-Kit® is de signed to work equally well on Intermient Pilot, Direct
spark and Hot Surface applicaons.
The 720-079 features a manual selector, wiring connecons and ad-
justments that are all easily accessible on the top of the valve. The
720-079 Uni-Kit has a pressure regulator that is pre-set at 3.5” W.C.
for natural gas. For L.P. gas applicaons the valve can be converted by
using a pressure regulator conversion kit that is included.
The 720-079 incorporates a manual valve, pilot valve (dual automac
valves and a main gas pressure regulator all in a small compact valve
with a swing radius of 3-9/16’’. The small size of the 720-079 lends
itself to replacing many O.E.M. and compeve valves. The 720-079
is mul-posional and can be mounted in any posion, except upside
down.
APPLICATION LIMITATIONS
Do not use on direct spark or hot surface applicaons if original valve
was a “slow opening” type. Also 720-079 will not replace Robertshaw
7000K series or White-Rodgers “cycle pilot” gas valves.
SPECIFICATIONS
Electrical Rangs 24 VAC, .45 amps
Pressure Regulator
Natural Gas factory set at 3.5” W.C.
L.P. gas factory set at 11.0” W.C.
Ambient Temperature -40° to 175°F
Maximum Inlet Pressure 7” W.C. - natural gas
14” W.C. - L.P. gas
REGULATION CAPACITIES
SIZE
TYPE GAS
NATURAL L.P.
MIN. MAX. MIN. MAX.
3/8” x 3/8" 15,000 175,000 15,000 280,000
1/2” x 3/8” 15,000 175,000 15,000 280,000
1/2" x 1/2" 15,000 200,000 15,000 320,000
1/2" x 3/4" 15,000 200,000 15,000 320,000
3/4" x 3/4" 15,000 200,000 15,000 320,000
INTERMITTENT PILOT • HOT SURFACE • DIRECT SPARK
PIPING
1. Check replacement valve for mulple outlets (side outlets). If it has
them, be sure all unused outlets are plugged using the socket plugs
provided.
2. Pipe or tubing must be clean and free of scale and dirt.
3. Make sure gas piping is pressure tested before control is connected.
High pressure can damage control causing a hazardous condion. Do
not subject control to more than 1/2 PSI, (14” W.C.) inlet pressure.
CAUTION
THIS DEVICE SHOULD BE INSTALLED BY A QUALIFIED
TECH NICIAN WITH DUE REGARD FOR SAFETY AS IMPROPER
IN STALLATION COULD RESULT IN A HAZARDOUS CONDITION.
4. If it’s not already installed, a drip leg (sediment trap) must be added to
the gas supply line to the control. (See gure below.) All piping must
comply with local codes and ordinances and with Naonal Fuel Gas Code
(ANSI Z223.1/ NFPA, No. 54).
INSTALLATION INSTRUCTIONS - ALL APPLICATIONS
Turn off gas supply and electrical power to equipment before servicing.
NOTE:
To prevent unsafe aempts at repair, special screws are used and replacement
parts are NOT available.
* A plug is included for hot surface and direct spark applicaons.
1

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INSTALLATION INSTRUCTIONS (Cont’d)
5. Using pipe thread compound suitable for the gas being used, apply
a small amount on the male pipe threads. (Do not use Teon tape
or Teon compound.) Leave the rst two threads clean. Never use
compound on female threads as it might be pushed into the control
body.
6. The gas valve is mul-posional and can be mounted in any posion
(except upside down) without aecng its operaon.
7. Install gas valve so gas ow conforms with the inlet and outlet of
the control.
8. DO NOT insert any object other than suitable pipe or tubing in the
inlet or outlet of this control. Internal damage may occur and result
in a hazardous condion. A backup wrench should only be used on
the wrench boss provided for this purpose (see drawing), never on
the body of the control, as
this could distort the casng.
NOTE: Do not over ghten any pipe connecons,
as this could crack the
valve body. A valve with a cracked valve body will not be warraned.
PRESSURE REGULATOR VENT
The 720-079 has a built-in Vent Limiter. The regulator vent is tapped
1/8” tubing if vent tubing is required. CAUTION: If bleed tubing is used,
do not allow main burner or pilot ame impingement on the tubing as
this will eventually cause clogging of the tubing and improper regula-
tor operaon. If bleed tubing is not used, the regulator vent must be
properly shielded from moisture.
LEAK TEST
Leak test with a soap soluon aer installing with main burner on.
Coat pipe and tubing joints, gasket, etc. with soap soluon. Bubbles
indicate leaks.
PILOT TUBING
1. Make sure tubing is free of burrs and dirt.
2. We strongly recommend that the pilot orice be checked and
cleaned if necessary at this me.
3. Connect pilot tubing into the control using ng provided, and
ghten for a gas ght seal.
WIRING
DO NOT short gas valve terminals. This will damage wall thermostat
and void warranty.
1. Check the system for the proper transformer by comparing the VA
rangs of the transformer and the system. The system rang is
determined by mulplying the voltage draw mes the amp draw.
Normally 20VA
transformers are sucient for heang only appli caons and 40VA for
heang/cooling applicaons.
NOTE: Improper transformer VA rang will cause errac system
operaon.
2. Connect the wire from the “MV” terminal on the ignion control unit
to the “M” terminal on the gas valve.
3. Connect the wire from the “PV” terminal on the ignion control unit
to the “P” terminal on the gas valve.
4. Connect the wire from the “MV/PV” terminal on the ignion control
unit to the ”C” terminal on the gas valve.
TYPICAL ROBERTSHAW INTERMITTENT PILOT APPLICATION
INSTALLATION INSTRUCTIONS – INTERMITTENT PILOT

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TYPICAL ROBERTSHAW HOT SURFACE APPLICATION
PILOT TUBING
NOTE: Some hot surface applicaons use the pilot outlet, if so proceed
as directed below. If not used install pilot outlet tubing plug packaged
in the 720-079 gas valve kit then proceed to “wiring”.
1. Make sure tubing is free of burrs and dirt.
2. We strongly recommend that the pilot orice be checked and
cleaned if necessary at this me.
3. Connect pilot tubing into the control using ng provided, and
ghten for a gas-ght seal.
WIRING
DO NOT short gas valve terminals. This will damage wall thermostat
and void warranty.
1. Check the system for the proper transformer by comparing the VA
rangs of the transformer and the system. The system rang is deter-
mined by
mulplying the voltage draw mes the amp draw.
INSTALLATION INSTRUCTIONS – HOT SURFACE APPLICATIONS
Normally 20VA transformers are sucient for heang only applica ons
and 40VA for heang /cooling applicaons.
NOTE: Improper transformer VA rang will cause errac system
operaon.
2. Locate the white wire terminal adaptor (jumper) that is included
with the 720-079 gas valve.
3. Connect the white wire terminal adaptor to the “M” and “P” termi-
nals on the 720-079 gas valve.
4. Determine which wire was connected to the “main valve” terminal
on the original valve. Connect this wire to the remaining terminal on
the white wire terminal adaptor.

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INSTALLATION INSTRUCTIONS - DIRECT SPARK
PILOT OUTLET
Install the pilot tubing plug packaged in the 720-079 gas valve.
WIRING
DO NOT short gas valve terminals. This will damage wall thermostat
and void warranty.
1. Check the system for the proper transformer by comparing the VA
rangs of the transformer and the system. The system rang is deter-
mined by
mulplying the voltage draw mes the amp draw. Normally
20VA transformers are sucient for heang only applica ons and
40VA for heang/cooling applicaons.
NOTE: Improper transformer VA rang will cause errac system
operaon.
2. Locate the white wire terminal adaptor (jumper) that is included
with the 720-079 gas valve.
3. Connect the white wire terminal adaptor to the “M” and “P” termi-
nals on the 720-079 gas valve.
4. Determine which wire was connected to the “main valve” terminal
on the original valve. Connect this wire to the remaining terminal on
the white wire terminal adaptor.
5. Connect the remaining wire from the original gas valve to the “C”
terminal on the 720-079 gas valve
TYPICAL ROBERTSHAW DIRECT SPARK APPLICATION

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CAUTION
1. WARNING: If you do not follow these instrucons exactly, a re
or explosion may result with property damage, per sonal injury
or loss of life.
2. Smell all around the appliance area for gas. If the appliance
uses L.P. (boled) gas, also be sure to smell next to the oor
because L.P. gas is heavier than air.
3. WARNING: If you smell gas, immediately shut o the manual
valve in the gas piping to the appliance. Don’t touch any elec-
trical switch or use the phone. Leave the building and call your
gas supplier. If he cannot be reached, call the re department.
4. WARNING: Do not force the gas control knob on the appliance.
Use only your hand to push down and/or to turn the gas control
knob. Never use any tools. If the gas control knob will not
operate by hand, the control should be replaced by a qualied
service technician. Force or aempted repair may result in re
or explosion.
5. WARNING: The gas control must be replaced if it has been
exposed to water.
OPERATING INSTRUCTIONS
SERVICE INSTRUCTIONS
CAUTION: If control has been exposed to water in any way, it must be
replaced. If gas valve fails to shut o, do not turn o electrical power.
Turn o gas supply allowing fan or circulang pump (if so equipped) to
connue running unl system has cooled. Replace control.
WARNING
Servicing of gas controls, appliance and systems must
be per formed by qualied service personnel only.
PRESSURE REGULATOR ADJUSTMENTS
Adjustment of the pressure regulator is not normally necessary since
it is preset at the factory. However, eld adjustment may be accom-
plished as follows:
NOTE: Manometer aachment may be accomplished at pressure tap
plug, above control outlet, as shown in gure to the right. If using inlet
pressure tap to measure incoming pressure. See drawing on rst page.
1.
Manometer or gauge aachment may be accomplished at pres sure
tap plug (D).
2. Remove regulator adjustment screw cap (top of control - A).
3. With small screwdriver, rotate adjustment screw (B) “clockwise” to
increase, or “counterclockwise” to decrease pressure to comply with
manufacturer’s specicaons.
4. Replace regulator adjustment screw cap (A).
REGULATOR CONVERSION
CAUTION: Main burner and pilot orices must be changed when regu-
lator is converted from one type of gas to another.
1. Turn o gas and electricity to appliance.
2. Remove sloed cap (A), adjusng screw (B), and natural gas spring -
not color coded - (C), from control.
3. Install new L.P. spring - color coded with a black strip.
4. Install new adjusng screw (B).
5. Aach manometer or pressure gauge at the outlet pressure tap. (D)
1. Turn wall thermostat to its lowest seng. Remove burner access
panel(s).
Selector arm must only be operated by hand (see below). DO NOT
use pliers, wrenches or other tools to operate the arm. The selector
arm cannot be moved into the “O” posion without rst depress-
ing the lever to the ”On” posion.
2. Move selector arm to the “O” posion. (See gure 1.)
3. WARNING: Wait at least 5 minutes to allow any gas in the
combuson
chamber to vent. If you then smell gas in the appliance area or near
the oor, STOP and follow warning instruc ons to the le. Failure to
do so may result in re or explosion.
4. Move selector arm to the “On” posion, (see gure 2), and set room
thermostat to desired temperature. Allow burner to cycle on and o.
5. Leak test with a soap soluon aer installing with main burner on.
Coat pipe and tubing joints, gasket, etc. with soap soluon. Bubbles
indicate leaks.
6. Replace burner access panel.
6. Turn gas and electricity on.
7. Turn room thermostat to call for heat.
8. With burner on, adjust screw (B) to supply LP. gas to pressure as
recommended by the appliance manufacturer.
9. If adjusng screw (B) reaches its maximum depth (booms out)
before recommended pressure seng is reached, turn screw
counterclockwise unl pressure drops slightly (approximately 0.1”
W.C.) WARNING: Do not stretch or alter spring.
10. Turn o gas and electricity to appliance.
11. Remove manometer or pressure gauge and reinstall pressure tap
outlet plug (D).
12. Install new red sloed cap in place of (A).
13. Turn gas and electricity on.
14. With burner operang, immediately check all ngs for leaks with
soap soluon. Bubbles indicate leaks that must be corrected.
15. Aach label to show control has been converted to L.P.
16. Set room thermostat to desired temperature.
FIGURE 1 FIGURE 2

Customer Service Telephone [phone]
Customer Service Facsimile 1.800.426.0804
[email protected]
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trademarks of Robertshaw, its subsidiaries and/or
affiliated companies. All other brands mentioned
may be the trademarks of their respective owners.
For Technical Service
Telephone [phone]
Facsimile 1.630.260.7294
[email protected]
www.uni-line.com
www.robertshaw.com
©2014 Robertshaw
07/14 –1-870 RevC
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