White Rodgers 1311 PRINCIPLE OF OPERATION Continued, Piping, Installation

PRINCIPLE OF OPERATION (Continued)

When thermostat is satisfied, the valve motor is again ener- gized. Just after the valve starts to close, side “A” of motor switch makes with holding contact providing a holding circuit. The side “B” of motor switch opens (breaking auxiliary circuit), and side “A” of motor switch makes with contact “4” then breaks the holding circuit stopping the valve in the closed position. (Fig. 2) The contact arrangement is constructed so that when the shaft of the motor revolves 90° a new set of stationary contacts makes while the old set breaks. (Fig. 1)

NOTE: INTERNAL PARTS AND				MOTOR SHAFT:
WIRING OF WATER VALVE.
JUMPER WIRES				Revolves in 90° intervals
				with each thermostat cycle.
			▼	STATIONARY CONTACTS
				(TERMINALS 2 & 3)
STATIONARY CONTACTS				▼
(TERMINALS 2 , 6 & COM.)		▼		2
				▼
▼	2			▼
		▼		3
				▼
				▼
▼		▼		▼
6

WATER VALVE
THERMOSTAT
ANTIC.		6
5
▼	▼
	SATISFIED
		4
CALL FOR
HEAT		▼ CLOSED
		POSITION

INTERNAL	SIDE “A” OF
	MOTOR SWITCH
WIRING	SIDE “B” OF
EXTERNAL
	MOTOR SWITCH
WIRING

Fig. 2

5		2
	SIDE “A”
6	OPEN	3
	POSITION
HOLDING
CONTACT
4
▼	▼	▼
▼
	▼
		1
	MOTOR

SCHEMATIC OF VALVE

TO AUXILIARY CIRCUIT FOR OPERATING BURNER AND/OR CIRCULATOR. (NOTE: IF SAME TRANS- FORMER POWERS BOTH THE AUXILIARY CIRCUIT AND THE WATER VALVE, CONNECT AUXILIARY CIR- CUIT TO TERMINALS 1 AND

3 INSTEAD OF 2 AND 3.)

SIDE “B”

OPEN

POSITION

LINE

TRANSFORMER

	▼				ROTATING BOARDS:
	▼				Each Board makes/breaks
		▼	▼		1 set of contacts with each
COMMON					90° revolution of motor
	2			4
					shaft on thermostat

demand.

STATIONARY CONTACTS (TERMINALS 2, 4 & COM.)

(Valve is shown in the open position)

Fig. 1

NOTE: To check motor operation without thermostat connected, jumper 4 to 5 to open valve; jumper 5 to 6 to close valve.

PIPING

PLAN 1

Water valves installed at the boiler header to provide a separate sup- ply to each zone.

Fig. 3

INSTALLATION

The two most commonly used piping systems are shown below. Plan 1 is popular for new installations, while plan 2 is frequently used for converting two-pipe systems.

This valve does not seal completely. A small amount of leakage through valve is permitted. The amount de- pends on valve size and pressure differential across closed valve. Do not use if your application requires complete seal off. Maximum leakage at rated differen- tial is two, four or six gal. per hour for 3/4", 1" or 1-1/4" valves, respectively.

PLAN 2 729

A common main supplies all zones, with a water valve installed on the riser to each zone.

Fig. 4

ALL GUARANTEES ARE VOID IF THE VALVE IS NOT ASSEMBLED ACCORDING TO THESE INSTRUCTIONS.

1.Remove body assembly only from shipping carton. Valve head and stem should be left in carton at this time for protective purposes. Do not assemble head to body before attaching body into line.

2.Mount the valve body in the line in any desired position except upside down. CAUTION: Provide the necessary clearances for turning valve head sideways when assem- bling it to valve body (see fig. 3). Note that terminal end of valve head requires more clearance.

3.Be sure that any excess solder, flux, or other foreign matter is thoroughly removed from the valve bore.

4.With valve body mounted in the line, remove the head assembly from the carton, and carefully wipe stem with a soft cloth to remove any dust or grit.

5.The valve head may now be assembled to the valve body. With valve head positioned as shown in figure 5, insert valve stem into valve bore, push downward, and turn valve head until it locks to valve body.

6.Support piping with a pipe hanger on each side of valve. The valve is now ready to be wired.

!CAUTION

Use only silicone grease, water, or soap suds on O-ring or Valve Body to facilitate assembly. Use of vaseline or any petroleum grease or oil will cause O-ring to deterio- rate.

!CAUTION

Be sure that bayonet lock securely latches mounting plate to body. Failure to do so could allow valve head to separate from body and result in scalding injuries and/or water damage.

2