Weil McLain Switch WMR 21 User Manual

Zone  
Controller  
Instruction manual  
• WMR-21 DPST (Double-pole/single throw)  
• WMR-22 DPDT (Double-pole/double throw)  
WMR-21  
24V  
T
T
W
Switching Relay  
C
R
Made in U.S.A.  
WMR-22  
Switching Relay  
NO NC  
6
6
24V  
T
T
W
5
R
C
L2 L1  
3
4
120 VAC  
Weil-McLain  
Michigan City, IN  
L2 L1  
3
4
4
NO NC  
120 VAC  
Made in U.S.A.  
Weil-McLain  
Michigan City, IN  
85902  
This manual must only be used by a qualified heating installer/service  
technician. Failure to comply could result in severe personal injury, death  
or substantial property damage.  
Part Number 550-141-859/0799  
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WMR-21 — Double pole/single throw switching relay  
85903  
T/W  
T/R  
C
WMR-21  
Switching Relay  
24V  
T
T
W
C
R
4
3
6
Made in U.S.A.  
Circuit ON  
24 VAC  
5
24 VAC field wiring  
24 VAC factory wiring  
120 VAC field wiring  
120 VAC ground lead  
120 VAC factory wiring  
120 VAC  
L2  
L1  
WMR-21 cross reference table  
Weil-  
Argo  
Honeywell Taco  
White-  
McLain  
Rodgers  
L2 L1  
3
4
5
6
WMR-21 AR821 RA 89A  
WMR-21 AR821 RA 832A  
WMR-21 AR821 R 845A  
SR501 809A-189  
SR501 829A-832  
SR501 829A-845  
120 VAC  
Weil-McLain  
Michigan City, IN  
WMR-22 — Double pole/double throw switching relay  
85904  
T/W  
T/R  
C
WMR-22  
Switching Relay  
NO  
NC  
NO  
NC  
4
4
6
6
NO NC  
6
6
24V  
T
T
W
5
R
C
24 VAC  
3
5
24 VAC field wiring  
24 VAC factory wiring  
120 VAC field wiring  
120 VAC ground lead  
120 VAC factory wiring  
120 VAC  
Jumper  
L2  
L1  
L2 L1  
3
4
4
WMR-22 cross reference table  
NO NC  
120 VAC  
Weil-McLain  
Argo  
Taco  
SR501  
Made in U.S.A.  
Weil-McLain  
Michigan City, IN  
WMR-22  
AR822  
85902  
Part Number 550-141-859/0799  
3
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WMR-21 and WMR-22  
WMR-21 Typical application  
General wiring  
Add circulator to L8124A or C  
aquastat/relay  
24 vac to 3-wire  
thermostat  
Thermostat or  
isolated contact  
to activate relay  
24 vac to 3-wire  
thermostat  
Thermostat or  
isolated contact  
to activate relay  
Electrical shock hazard —  
Disconnect power before  
installing or servicing. Can  
cause severe personal injury,  
death or substantial property  
damage if ignored.  
WMR-21  
WMR-21  
T
R
T
W
T
R
T
W
C
C
Remove factory-  
24 VAC  
24 VAC  
All wiring must be installed in  
accordance with:  
U.S.A. National Electrical  
Code and any other  
national, state or local code  
requirements. Wiring must  
be N.E.C. Class 1.  
Canada C.S.A. C22.1  
Canadian Electrical Code  
Part 1 and any other  
installed jumper from  
L1 to 3 to use 3–4  
as isolated contacts.  
120 VAC  
120 VAC  
L2 L1  
3
4
5
6
L2 L1  
3
4
5
6
Ground  
screw  
Ground  
screw  
Ground  
Neutral  
Ground  
Neutral  
120 VAC  
Hot  
120 VAC  
Hot  
85905  
national, provincial or local  
code requirements. Wiring  
must be C.S.A. C22.1 C.E.C.  
Part 1.  
Thermostat or  
isolated contact  
to activate relay  
Circulator 2  
T
T
ZR  
ZC  
B1  
B2  
C1  
C2  
1
WMR-22  
T
R
T
C
5
6
6
W
NO NC  
L8124A or C  
Aquastat/relay  
To burner control  
Circulator 1  
24 VAC  
Neutral  
120 VAC  
Hot  
120 VAC  
Remove factory-  
installed jumper from  
L1 to 3 to use 3/4/4  
as isolated contacts.  
2
L2 L1  
3
4
4
Ground  
screw  
85907  
NO NC  
Ground  
Neutral  
120 VAC field wiring  
120 VAC ground lead  
120 VAC factory wiring  
Legend  
24 VAC field wiring  
120 VAC  
Hot  
24 VAC factory wiring  
85906  
Part Number 550-141-859/0799  
4
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