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5

CAUTION

1.  

WARNING:

 If you do not follow these instructions exactly, a fire 

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. (bottled) gas, also be sure to smell next to the floor 
because L.P. gas is heavier than air.

3.  

WARNING:

 If you smell gas, immediately shut off 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 fire 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 qualified 
service technician. Force or attempted repair may result in fire 
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 off, do not turn off electrical power. 
Turn off gas supply allowing fan or circulating pump (if so equipped) to 
continue running until system has cooled. Replace control.

WARNING

Servicing of gas controls, appliance and systems must 
be per formed by qualified service personnel only.

PRESSURE REGULATOR ADJUSTMENTS

Adjustment of the pressure regulator is not normally necessary since 
it is preset at the factory. However, field adjustment may be accom-

plished as follows:

NOTE:

 Manometer attachment may be accomplished at pressure tap 

plug, above control outlet, as shown in figure to the right. If using inlet 
pressure tap to measure incoming pressure. See drawing on first page.

1.  Manometer or gauge attachment 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 specifications.

4. Replace regulator adjustment screw cap (A).

REGULATOR CONVERSION

CAUTION:

 Main burner and pilot orifices must be changed when regu

-

lator is converted from one type of gas to another.
1. Turn off gas and electricity to appliance.
2.  Remove slotted cap (A), adjusting 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 adjusting screw (B).
5. Attach manometer or pressure gauge at the outlet pressure tap. 

(D)

1. Turn wall thermostat to its lowest setting. 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 “Off” position without first depress

-

ing the lever to the ”On” position.

2. Move selector arm to the “Off” position. (See figure 1.)
3.  

WARNING:

 Wait at least 5 minutes to allow any gas in the 

 

combustion 

 

chamber to vent. If you then smell gas in the appliance area or near 
the floor, STOP and follow warning instruc tions to the left. Failure to 
do so may result in fire or explosion.

4.  Move selector arm to the “On” position, (see figure 2), and set room 

 

thermostat to desired temperature. Allow burner to cycle on and off.

5.  Leak test with a soap solution after installing with main burner on. 

Coat pipe and tubing joints, gasket, etc. with soap solution. 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 adjusting screw (B) reaches its maximum depth (bottoms out) 

before recommended pressure setting is reached, turn screw 

 

counterclockwise until pressure drops slightly (approximately 0.1” 
W.C.) 

WARNING:

 Do not stretch or alter spring.

10. Turn off gas and electricity to appliance.
11.  Remove manometer or pressure gauge and reinstall pressure tap 

outlet plug (D).

12. Install new red slotted cap in place of (A).
13. Turn gas and electricity on.
14.  With burner operating, immediately check all fittings for leaks with 

 

soap solution. Bubbles indicate leaks that must be corrected.

15. Attach label to show control has been converted to L.P.
16. Set room thermostat to desired temperature.

FIGURE 1

FIGURE 2

Summary of Contents for Uni-Kit 720-079

Page 1: ...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 Che...

Page 2: ...gging of the tubing and improper regula tor operation If bleed tubing is not used the regulator vent must be properly shielded from moisture LEAK TEST Leak test with a soap solution after installing with main burner on Coat pipe and tubing joints gasket etc with soap solution Bubbles indicate leaks PILOT TUBING 1 Make sure tubing is free of burrs and dirt 2 We strongly recommend that the pilot ori...

Page 3: ... 1 Check the system for the proper transformer by comparing the VA ratings of the transformer and the system The system rating is deter mined by multiplying the voltage draw times the amp draw INSTALLATION INSTRUCTIONS HOT SURFACE APPLICATIONS Normally 20VA transformers are sufficient for heating only applica tions and 40VA for heating cooling applications NOTE Improper transformer VA rating will ...

Page 4: ...nt for heating only applica tions and 40VA for heating cooling applications NOTE Improper transformer VA rating will cause erratic system operation 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 ...

Page 5: ...ifications 4 Replace regulator adjustment screw cap A REGULATOR CONVERSION CAUTION Main burner and pilot orifices must be changed when regu lator is converted from one type of gas to another 1 Turn off gas and electricity to appliance 2 Remove slotted cap A adjusting 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 ...

Page 6: ...gon and Uni Line are 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 1 800 445 8299 Facsimile 1 630 260 7294 TechnicalService robertshaw com www uni line com www robertshaw com 2014 Robertshaw 07 14 1 870 RevC 6 ...

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