Weil-McLain WMR-21, WMR-22 User Manual
Zone
Controller
Instruction manual
• WMR-21 DPST (Double-pole/single throw)
• WMR-22 DPDT (Double-pole/double throw)
WMR-21
Switching Relay
Weil-McLain
Michigan City, IN
24V
L2 L1
120 VAC
T
T
RC
W
Made in U.S.A.
Circuit ON
WMR-22
Switching Relay
W
24V
T
T
RC
3
5
4
6
Circuit ON
L2 L1
120 VAC
5
3
NONONC
6
6
4
4
NC
Made in U.S.A.
85902
Weil-McLain
Michigan City, IN
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
WMR Switching Relays
Contents Hazard definitions and “To the installer” .............................................................. 2
Specifications and replacement parts ................................................................... 2
WMR-21 layout, schematic diagram and cross reference table ......................... 3
WMR-22 layout, schematic diagram and cross reference table ......................... 3
WMR-21 and WMR-22 General wiring .................................................................. 4
WMR-21 Typical application wiring ..................................................................... 4
Hazard definitions
To the installer
Indicates presence of hazards that will cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that can cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that will or can cause minor personal injury
or property damage.
Indicates special instructions on installation, operation or maintenance that
are important but not related to personal injury or property damage.
Electrical shock hazard — Disconnect power before installing or servicing.
Can cause severe personal injury, death or substantial property damage if
ignored.
To avoid severe personal injury, death or substantial property damage, never
connect the load terminals to a load that takes more current than the amount
listed for the relay in the electrical ratings.
Use copper wire only. Use of any other type of wire could cause a fire hazard
resulting in severe personal injury, death or substantial property damage.
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
national, provincial or local code requirements. Wiring must be C.S.A.
C22.1 C.E.C. Part 1.
Specifications
Replacement parts
2
Weil-McLain
model
number
WMR-21 120 V 60 HZ
WMR-22 120 V 60 HZ
Part description Weil-McLain part number
Plug-in relay (24 VAC coil) 510-311-021
Transformer
voltage
15 VA
15 VA
Switching
action
DPST .18 10 A,
DPDT .18 10 A,
Thermostat
current
amps
120 VAC 240 VAC
Part Number 550-141-859/0799
Single-phase motor
rating
10 A,
¹⁄₃ HP
¹⁄₃ HP
¹⁄₂ HP
10 A,
¹⁄₂ HP
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