Каталог для White Rodgers 752-2 Automatic Change-Over Control

SPDT Control Provides Automatic Change-Over of Thermostat to 

Operate Zone Valve on Combination Hot and Chilled Water Systems

• Epoxy resin seal protects bimetallic disc and Snap-Action contacts from dust, dirt

  and corrosion.

• Furnished with removable spring clip to attach control to tubing.

• SPDT switch connects heating side of thermostat to two-wire zone valve when hot

  water is circulated through tubing.

• SPDT switch connects cooling side of thermostat to two-wire zone valve when

  chilled water is circulated through tubing.

• Curved sensing element provides maximum contact with tubing.

 

752-1 

752-2 

SPDT 

7.5A 

3.75A 

45.0A 

22.5A 

125 VA 

15A

Electrical Connections . . . . . . . . . . . . . . .  

12” red, brown and black leads,

   

  105°C insulated, No. 18 wire

Temperature Settings . . . . . . . . . . . . . . . .   Red-Black: open on rise @ 85°F,

   

  close @ 70°F

   

  Red-Brown: close on rise @ 85°F,

   

  open @ 70°F

Ambient Temperature . . . . . . . . . . . . . . . .   221°F maximum

(

5

/

8

”

 O.D.)

: USE WITH

ZONE VALVES ON PAGES 103-104 

FOR HEAT / COOL APPLICATIONS.

5
4

3

2

1

5
4

6

6

5
4

6

5
4

6

3

2

1

3

2

1

3

2

1

4

2

2

1

3

4

2

2

1

3

4

2

2

1

3

4

2

2

1

3

BLACK
RED
BROWN

W/R

CHANGE-

TRANSFORMER

TYPE 1361 TWO-WAY-

ZONE VALVES.

WHEN USING ONE TRANSFORMER PER VALVE.

OMIT THIS LINE BETWEEN ALL VALVES.

OVER

SWITCHES

25V.

120V.

–

 12” red, brown, and black leads, 105ºC insulated, No. 18 wire.

–

  Red-Black, open at 85ºF + 6º

 

                      Red-Brown, open 70ºF + 6º   

– 220

ºF Max.

Typical diagram using Type 1361 valves (25 volts)with Changeover Switch. Boiler, chiller, 

and circulator operation are independent of thermostat demand.

105

105