Robertshaw 720 Series Installation Data

The Robertshaw® 720 Series Gas Controls are designed for a wide
variety of heating applications and can be used to replace most dual
(six function) valves. They are available only in a 24 volt model used
with a constant pilot. Models are available with and without a pressure
regulator. Uni-Kits® are factory set at 3.5" W.C. for natural gas, but can
be converted to L.P. by installing the regulator conversion kit included.
(See Regulator Conversion section.)
The 720 Series, used with a constant pilot, is a six function valve
incorporating a manual valve, safety shutoff magnet, dual automatic
valves (hence the term "dual valves"), main gas regulator, and pilot
adjustment. It features an integral manual selector used to select from
four gas flow positions - off, on, pilot and "set." The "set" position
provides pilot only gas flow during magnet energizing and lock up.
Built-in stops serve to prevent accidental setting to the "off" position.
Wiring connections, manual selector and adjustments are easily
accessible on the top of the valve. With a 3-9/16" swing radius, the 720
Series lends itself well to replacing many OEM valves. Controls are
multiposition and can be mounted in any position (except upside down).
To prevent unsafe attempts at repair, special screws are used and
replacement parts are NOT available.
SPECIFICATIONS
Electrical Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V AC, .5 amps
Pressure Regulator
Natural Gas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .factory set at 3.5" W.C.
L.P. Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . factory set at 11.0" W.C.
Pilot Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4" tubing
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to 175°F
Maximum Inlet Pressure . . . . . . . . . . . . . . . . . . . . . . 7" W.C. - natural gas
REGULATION CAPACITIES (BTU'S)
NATURAL
SIZE MIN.
3/8" x 3/8" 15,000
1/2" x 3/8" 15,000
1/2" x 1/2" 15,000
1/2" x 3/4" 15,000
3/4" x 3/4" 15,000
INSTALLATION INSTRUCTIONS
Turn off gas supply and electrical power to equipment
before servicing.
PIPING
1. Check replacement valve for multiple 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 condition. Do
not subject control to more than 1/2 PSI, (14" W.C.) inlet pressure.
4. If it is not already installed, a drip leg (sediment trap) must be
added to the gas supply line to the control. (See figure to the right).
All piping must comply with local codes and ordinances and with
National Fuel Gas Code (ANSI Z223.1/ NFPA, No. 54).
DUAL VALVE GAS HEATING CONTROLS
TYPE GAS
L.P.
MAX. MIN. MAX.
175,000 15,000 280,000
175,000 15,000 280,000
200,000 15,000 300,000
200,000 15,000 300,000
200,000 15,000 300,000
INSTALLATION DATA
THIS DEVICE SHOULD BE INSTALLED BY A QUALIFIED
TECHNICIAN WITH DUE REGARD FOR SAFETY AS IMPROPER
INSTALLATION COULD RESULT IN A HAZARDOUS CONDITION.
5. Using pipe thread compound suitable for the gas being used, apply a
small amount on the male pipe threads. (Do not use Teflon tape or
Teflon compound.) Leave the first two threads clean. Never use
compound on female threads as it might be pushed into the control
body.
6. The gas valve is multiposition and can be mounted in any position
(except upside down) without affecting its operation.
7. Install gas valve so gas flow 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 condition. A backup wrench should only be used on
the wrench boss provided for this purpose (see drawing), never on
body of the control, as this could distort the casting. NOTE: Do not
overtighten any pipe connections, as this could crack the valve body.
A valve with a cracked valve body will not be warrantied.
720 SERIES
CAUTION