Gas Conversion Component Specs

Caution: This device should be installed by a qualified service techinican with due regard for safety, as improper installation could result in hazardous condition.

The 710 Series gas controls are designed for a wide variety of low capacity heating applications. Models are available for Manual, Millivolt, Hydraulic and 24 Volt. Models are available with and without a pressure regulator. Controls are multiposition and can be mounted in any position (except upside down).

SPECIFICATIONS
ELECTRIC RATINGS
24 Volt Models	12 VDC - 0.18 amps 24 VAC - 0.2 amps
Millivolt Models	50 MV to 750 MV (Two-lead thermopile only)
PRESSURE REGULATOR (Optional by Model)
Natural Gas	Factory set at 3.5" W.C.
LP Gas	Separate or field addable only
CAPILLARY LENGTH (Hydraulic Models Only)	18 or 36 inches
BULB 0.0. & LENGTH (Hydraulic Models Only)	1/4 x 8 inches
INLET OUTLET	3/8 FPT or 1/2 inch pipe depending on model
PILOT OUTLET	1/4 inch Tubing
AMBIENT TEMPERATURE	40° to 175°F
MAXIMUM INLET PRESSURE	1/2"= inch PSI Max.
Capacity
1 inch Pressure Drop	40,000 BTU/Natural Gas (64,OO0) TU/L.P. Gas
Maximum	70,000 BTU/Natural Gas 112,OO0 BTU/L.P. Gas
TEMPERATURE RANGE (Hydraulic Heatig Models Only)

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 control. All piping must comply with local codes and ordinances and with National Fuel Gas Code (ANSI Z223.1/NFPA, No. 54).
5. Using pipe thread compound or tape (suitable for gas), apply a small amount on the male pipe threads. 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, never on the body of the control, as this could distort the casting. Note: Do not over tighten any pipe connections, as this could crack the valve body. A valve with a cracked valve body will not be warranted.

PILOT TUBING

1. Make sure tubing is free of burrs and dirt.
2. We strongly recommend that the pilot orifice be checked and cleaned if necessary at this time.
3. Connect pilot tubing into the control using fitting provided, and tighten for a gas tight seal.

PRESSURE REGULATOR VENT
The 710, when equipped with a pressure regulator, has as standard equipment a built-in Vent Limiter. The regulator vent is tapped 1/8" tubing. Use 4590-065 tubing fitting if vent tubing is required. CAUTION: If bleeding tube is used, do not allow main burner or pilot flame impingement on the tubing as this will eventually cause clogging of the tubing and improper regulator operation. If bleed tubing is not used, the regulator vent must be properly shielded from moisture.

THERMOCOUPLE CONNECTION
The thermocouple nut should be started and turned all the way in by hand. An additional quarter turn with a small (4") wrench will then be sufficient to set the lock washer. CAUTION: Over tightening may cause damage to the thermocouple or magnet and is unnecessary.

HYDRAULIC MODELS

• Note: Capillary is liquid-filled and sharp bends are to be avoided.
• Sensing bulb positioning is important. Attach remote sensing bulb into the existing clips provided by the manufacturer of the equipment.
• On models with oval capillary or remote dial, install remote dial unit into panel opening provided by the manufacturer.
• For installations requiring a remote dial drive rod to operate the gas cock dial, order 1751-009 Drive Rod Adaptor Kit.
• Install as follows:
  1. Remove and discard original screw in the center of the gas cock dial.
  2. Position adaptor on top of the gas cock dial as shown.
  3. Using the new longer screw provided tighten adaptor into place and install drive rod.

WIRING
24-Volt Models

1. Check the system for the proper transformer by comparing the VA ratings of the transformer and the system. The system rating is determined by multiplying the voltage draw times the amp draw. Normally 20VA transformers are sufficient for heating only applications and 40VA for heating / cooling applications.
2. Connect lead from transformer to "TR" terminal on gas valve operator
3. Connect lead to wall thermostat to "TR" terminal on gas valve operator

Most appliances manufactured in the USA and Canada are manufactured to meet the standards set forth by the American National Standards Institute (ANSI). A recent revision in the standards "miswiring requirements for gas valves" was effective January 1, 1996. The reason for this standard was so that you as a service technician could disconnect the gas valve wires and reconnect them without making a mistake. Therefore all Robertshaw millivolt gas valves now meet the new standard. The 710-500 series millivolt gas valves now have a 1/4" quick connect terminal and a 3/16" quick connect terminal on the terminal block. There is NO terminal screw (or threads) on the side that has the 3/16" terminal. If your old application used a terminal screw, you will need to use a 3/16" adaptor terminal.

The 710-500 Series millivolt valves are designed to operate with 1950 Series two-lead thermopiles only. These valves will also operate with any competitive (two-lead) thermopiles having outputs of 250 MV to 750 MV.

For best operation of a millivolt system, the lead wires from the valve to the wall thermostat should not exceed the recommended maximum lengths shown below.

OPERATING INSTRUCTIONS
LP Gas Applications
To avoid possible injury, fire and explosion, please read and follow these precautions and all instructions on appliance before lighting the pilot. L.P, (Propane) gas is heavier than air and will remain at floor level if there is a leak. Before lighting, sniff at floor level. If you smell gas, follow these rules.

1. Get all people out of building.
2. Do not light matches. Don not turn electrical lights or switches on or off in area. Do not use an electric fan to remove gas from area.
3. Shut off gas at L.P. tank outside of building.
4. Telephone gas company and fire department. Ask instructions.

If LP tank runs out of fuel, turn off gas at appliance, After LP. tank is refilled; appliance must be relit according to manufacturer's instructions. If the gas control has been exposed to WATER in any way, do not try to use it. It must be replaced. Do not attempt repair on gas control or appliance. Tampering is DANGEROUS and voids all warranties.

PROCEDURE FOR LIGHTING OR RELIGHTING

Dials must be operated by hand. DO NOT use pliers, wrenches or other tools to turn dials. The Gas Cock Dial has a dual function:

• Complete control of gas to pilot and main burner.
• When in pilot position, it is the reset mechanism for the automatic pilot.

1. Depress and turn Gas Cock Dial to "OFF" position.
2. Turn temperature dial (hydraulic models) or wall thermostat (24V and millivolt models) to "OFF" or lowest setting.
3. Wait at least 5 minutes (10 minutes for LP gas) to allow gas which may have accumulated in burner compartment too escape.
4. Turn Gas Cock Dial to the "PILOT" position.
5. Hold match at pilot burner. CAUTION: If pilot lights without depressing Gas Cock Dial replace control. Depress and hold Gas Cock Dial while lighting pilot burner. Allow pilot to burn approximately one half minute. (1-1/2 minutes for millivolt models) before releasing Gas Cock Dial. If pilot does not remain lighted, repeat operation allowing longer period before releasing Gas Cock Dial. (Adjust pilot, if necessary, as noted, under "Pilot Burner Adjustment.") The thermocouple or thermopile may also be defective and should be checked out. (See SERVICE INSTRUCTIONS.")
6. Refer to specific model to the right.

Manual Models Only
The appliance is now in operation. When heat is desired, turn Gas Cock Dial to "ON" position. When heat is no longer required, turn Gas Cock Dial back to "PILOT" position.

Hydraulic Models
Turn Gas Cock Dial to "ON" position and turn temperature dial to desired position. Allow burner to cycle on and off.

24 Volt and Millivolt Models
Turn Gas Cock Dial to "ON" position and set room thermostat to desired temperature. Allow burner to cycle on and off.

CAUTION: Keep combustible material away from gas appliance. Keep burner area clean and free of dust and lint.

LEAK TEST
Test for gas leaks after valve installation with main burner on. Use a rich soapy water, and paint all piping and tubing joints liberally. Bubbles are indicative of a leak.

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.

AUTOMATIC PILOT SYSTEM
To perform the following test, we recommend using our 900-040-test meter.
There are three major causes of pilot outage in the automatic pilot systems.

1. Improper pilot operation.
2. Low output thermocouple or thermopile.
3. Inoperative automatic pilot magnet.

Thermocouple Check (Except Millivolt)
A closed circuit millivolt check is used to check thermocouple output. This check is performed as follows:

1. Check for proper pilot operation.
2. Use a millivolt meter with a 0-50 millivolt range.
3. Connect Adaptor Part No. 10-038 and 900-040 millivolt meter leads as shown in figure below. Be sure connections are snug.
4. Follow standard lighting procedure.
5. Check closed circuit thermocouple output, if less than eight millivolts, replace with Robertshaw 1970 or 1980 thermocouple.
6. Repeat standard lighting procedure after thermocouple replacement.

Automatic Pilot Magnet Check (Thermocouple Type)
If the closed circuit check shows thermocouple output is greater than eight millivolts and pilot will not remain lit when reset button is released after initial lighting procedure, check operation of pilot magnet as follows:

1. Adaptor Part No. 10-038 should remain connected in system as shown in figure on bottom of page.
2. Follow standard lighting procedure and continue holding reset button down.
3. Allow thermocouple output to stabilize and note meter reading.
4. Extinguish pilot by releasing reset button and turning GAS COCK DIAL to "OFF" position.
5. A good magnet should remain locked up for a drop of five millivolts or more from the original stabilized reading before releasing.
6. If magnet does not operate properly, replace the valve. 7. Repeat standard lighting procedure.
7. Repeat standard lighting procedure.

Millivolt System
The millivolt system and individual components may be checked with a millivolt meter having a 0-1000 MV range (900-040). Before checking system, be-certain wall-thermostat lead-wire-does-not-exceed recommended in Wiring Section Table, and all connections are clean and tight.

Conduct each check shown in chart shown below by connecting meter test leads to terminals as indicated. All readings are closed circuit.

A. TEST RESULTS If the reading is more than 100 millivolts and the automatic valve does not come on, replace the valve operator. If the closed circuit reading is less than 100 millivolts, determine the cause by proceeding with steps "B" and "C".
B. TEST RESULTS If "B" reading is less than 325 MV, clean and tighten all electrical connections and adjust pilot if necessary to increase millivolt output. If unable to adjust to at least the specified minimum, change the thermopile. When proper thermopile output is obtained, the magnet may then be checked. With pilot in operation, allow meter reading to stabilize. Extinguish pilot burner and note meter reading at dropout point of magnet. If magnet remains locked up to a reading of 120 MV or less, the magnet is good.
C. TEST RESULTS If "C" reading is more than that specified for the system being checked, clean and tighten thermostat leads and connections, shorten lead wires if possible or use heavier gauge wire. Rapidly cycle thermostat to clean contacts, or change the thermostat.

PILOT BURNER ADJUSTMENT

1. Remove pilot adjustment cap.
2. Adjust pilot key to provide properly sized flame on the thermocouple or thermopile. The flame should cover the upper 3/8 inch of the tip.
3. Replace pilot adjustment cap.

REGULATOR CONVERSION OR REPLACEMENT
CAUTION: Main burner and pilot orifices must be changed when regulator is converted from one type gas to another.
710 Series valves can be converted from nonregulated to regulated operation by adding one of the 1751 Series regulators. To convert from regulated to nonregulated, order Part Number 1751-007. To convert to L.P. gas 11.0" W.C. use 1751-013.

1. Depress and turn Gas Cock Dial to "OFF".
2. Remove two screws, regulator cartridge and gasket.
3. Install new gasket and regulator (this assembly must be positioned properly). Use new screws supplied with regulator.
4. Relight appliance by following steps 4, 5 and 6 of procedure for lighting or relighting.
5. Test for leaks around the regulator using soap solution with main burner "ON".

PRESSURE REGULATOR ADJUSTMENTS
Adjustment of the pressure regulator is not normally necessary since it is preset at the factory. However, field adjustment may be accomplished as follows: NOTE: Manometer attachment may be accomplished at pressure tap plug, below control outlet, as shown in figure below.

1. Manometer or gauge attachments may be accomplished at pressure tap plug.
2. Remove regulator adjustment screw cap.
3. With a small screwdriver, rotate adjustment screw "clockwise" to increase, or "counterclockwise" to decrease pressure.
4. Replace regulator adjustment screw cap.

MODELS WITH PRESSURE TAPS ON TOP OF VALVE.
Some models will have the inlet and outlet pressure taps located on the top of the valve. Field adjustment may be accomplished as follows:

1. Turn Gas Cock Dial to "OFF" position.
2. Loosen, but do not attempt to remove, the inlet or outlet pressure screen. Turn screw counterclockwise.
3. Attach manometer to the inlet or outlet pressure tap boss. Note: hose should be 5/16" I D. for best operation.
4. Turn Gas Cock Dial to the "PILOT" position and light pilot.
5. With pilot safety stabilized, turn Gas Cock Dial to the "ON" position.
6. Turn wall thermostat to highest setting to bring gas valve "ON".
7. Remove regulator adjustment screw cap. (Top of regulator.)
8. With a small screwdriver, rotate adjustment screw "clockwise" to increase, or "counterclockwise" to decrease pressure.
9. Replace regulator adjustment screw cap.
10. Turn the Gas Cock Dial to "OFF" position. Lower thermostat to comfort temperature.
11. Light pilot and put control into normal operation.