105 / 221
HYDRONIC
CONTROLS
CONTRACTOR TIP
: USE WITH
ZONE VALVES ON PAGE 104 FOR
heat / cool applications.
AUTOMATIC CHANGE-OVER SWITCH
SPDT Control Provides Automatic Change-Over of Thermostat to
Operate Zone Valve on Combination Hot and Chilled Water Systems
FEATURES
• 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
SPECIFICATIONS
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
REMOTE TEMPERATURE
CONTROLS
TYPES FOR USE WITH 1/2" TUBING (5/8" O.D.)
TYPES
SWITCH
ACTION
A.C MOTOR RATING
PILOT
DUTY
(120V or
240V)
NON-IN-
DUCTIVE
(120 or
240V)
WITHOUT
CONDUIT
CONNECTOR
WITH
CONDUIT
CONNECTOR
FULL LOAD
LOCKED ROTOR
120V
240V
120V 240V
752-1
752-2
SPDT
7.5A 3.75A 45.0A 22.5A 125 VA 15.0A
TYPES FOR USE WITH 3/4" TUBING (7/8" O.D.)
752-1
SPDT
7.5A
3.75A
45.0A
22.5A
125 VA
15.0A
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.
SPECIFICATIONS
Electrical Connections
–
12” red, brown, and black leads, 105ºC insulated, No. 18 wire.
Temperature Settings
–
Red-Black, open at 85ºF + 6º
Red-Brown, open 70ºF + 6º
Ambient Temp.
– 220
ºF Max.
Typical diagram using Type 1361 valves (25 volts)with Changeover Switch. Boiler, chiller,
and circulator operation are independent of thermostat demand.
TYPES FOR USE WITH ½
”
TUBING
(
5
/
8
”
O.D.)
Model Number
without conduit
connector
Model Number
with conduit
connector
Switch
Action
Motor Rating
Pilot Duty
120 / 240 /
277 VAC
Resistive
(non-inductive)
120 / 240 / 277 VAC
Full Load
Lock Rotor
120 VAC
240 VAC
120 VAC
240 VAC
752-1
752-2
SPDT
7.5A
3.75A
45.0A
22.5A
125 VA
15A
www.white-rodgers.com106
HYDRONIC /
APPLIANCE