White Rodgers 752-1 Automatic Change-Over Control Catalog Page

White Rodgers
Brand
White Rodgers
Model
752-1 Automatic Change-Over Control
Type
Catalog Page

White Rodgers 752-1 Automatic Change-Over Control is designed to automatically switch between heating and cooling modes in combination hot and chilled water systems. It features an epoxy resin seal that protects the bimetallic disc and snap-action contacts from dust, dirt, and corrosion. The control comes with a removable spring clip for attaching it to tubing. The SPDT switch connects the heating side of the thermostat to a two-wire zone valve when hot water is circulated through the tubing.

White Rodgers 752-1 Automatic Change-Over Control is designed to automatically switch between heating and cooling modes in combination hot and chilled water systems. It features an epoxy resin seal that protects the bimetallic disc and snap-action contacts from dust, dirt, and corrosion. The control comes with a removable spring clip for attaching it to tubing. The SPDT switch connects the heating side of the thermostat to a two-wire zone valve when hot water is circulated through the tubing.

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.
Model Number Model Number Motor Rating Pilot Duty Resistive
without conduit with conduit Switch Full Load Lock Rotor 120 / 240 / (non-inductive)
connector connector Action 120 VAC 240 VAC 120 VAC 240 VAC 277 VAC 120 / 240 / 277 VAC
752-1 752-2 SPDT 7.5A 3.75A 45.0A 22.5A 125 VA 15A
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
TYPES FOR USE WITH ½” TUBING (
5
/
8
” O.D.)
CONTRACTOR TIP: USE WITH
ZONE VALVES ON PAGES 103-104
FOR HEAT / COOL APPLICATIONS.
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 SPDT7.5A3.75A 45.0A 22.5A 125 VA 15.0A
TYPES FOR USE WITH 3/4" TUBING (7/8" O.D.)
752-1 SPDT7.5A3.75A 45.0A 22.5A 125 VA 15.0A
5
4
3
2
1
5
46
6
5
46
5
46
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 VA LVE.
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. – 220ºF Max.
Typical diagram using Type 1361 valves (25 volts)with Changeover Switch. Boiler, chiller,
and circulator operation are independent of thermostat demand.
www.white-rodgers.com
105
105
HYDRONIC /
APPLIANCE
  • Page 1 1

White Rodgers 752-1 Automatic Change-Over Control Catalog Page

White Rodgers
Brand
White Rodgers
Model
752-1 Automatic Change-Over Control
Type
Catalog Page

White Rodgers 752-1 Automatic Change-Over Control is designed to automatically switch between heating and cooling modes in combination hot and chilled water systems. It features an epoxy resin seal that protects the bimetallic disc and snap-action contacts from dust, dirt, and corrosion. The control comes with a removable spring clip for attaching it to tubing. The SPDT switch connects the heating side of the thermostat to a two-wire zone valve when hot water is circulated through the tubing.

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