Weil-McLain WMR-21 User manual

Brand: Weil-McLain

Model: WMR-21

Category: Electrical relays

Type: User manual

This manual is also suitable for

WMR-22

120 VAC

Circuit ON

Weil-McLain

Michigan City, IN

WMR-21

Switching Relay

L2 L1

24V

Made in U.S.A.

Part Number 550-141-859/0799

Zone

Controller

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.

Instruction manual

• WMR-21 DPST (Double-pole/single throw)

• WMR-22 DPDT (Double-pole/double throw)

120 VAC

Circuit ON

Weil-McLain

Michigan City, IN

Switching Relay

Made in U.S.A.

WMR-22

L2 L1

24V

85902

Part Number 550-141-859/0799

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

Replacement parts

Hazard definitions

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.

To the installer

Specifications

Weil-McLain

model

number

Transformer

voltage

Switching

action

Thermostat

current

amps

Single-phase motor

rating

120 VAC 240 VAC

WMR-21 120 V 60 HZ

15 VA

DPST .18 10 A,

¹⁄₃ HP

10 A,

¹⁄₂ HP

WMR-22 120 V 60 HZ

15 VA

DPDT .18 10 A,

¹⁄₃ HP

10 A,

¹⁄₂ HP

Part description Weil-McLain part number

Plug-in relay (24 VAC coil) 510-311-021

Part Number 550-141-859/0799

WMR-21 — Double pole/single throw switching relay

WMR-22 — Double pole/double throw switching relay

WMR-22 cross reference table

WMR-21 cross reference table

120 VAC

Circuit ON

Weil-McLain

Michigan City, IN

WMR-21

Switching Relay

L2 L1

24V

Made in U.S.A.

120 VAC

Circuit ON

Weil-McLain

Michigan City, IN

Switching Relay

Made in U.S.A.

WMR-22

L2 L1

24V

85902

24 VAC

Jumper

L2 L1

T/R

T/W

120 VAC

Relay coil

85903

120 VAC field wiring

120 VAC ground lead

120 VAC factory wiring

24 VAC field wiring

24 VAC factory wiring

24 VAC

Jumper

L2 L1

T/R

NO NC NO NC

T/W

120 VAC

85904

4646

Relay coil

120 VAC field wiring

120 VAC ground lead

120 VAC factory wiring

24 VAC field wiring

24 VAC factory wiring

Weil-

McLain

Argo Honeywell Taco White-

Rodgers

WMR-21 AR821 RA 89A SR501 809A-189

WMR-21 AR821 RA 832A SR501 829A-832

WMR-21 AR821 R 845A SR501 829A-845

Weil-McLain Argo Taco

WMR-22 AR822 SR501

Part Number 550-141-859/0799

Electrical shock hazard —

Disconnect power before

installing or servicing. Can

cause severe personal injury,

death or substantial property

damage if ignored.

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.

WMR-21 — Typical application

Add circulator to L8124A or C

aquastat/relay

WMR-21 and WMR-22

General wiring

85907

24 VAC

120 VAC

Thermostat or

isolated contact

to activate relay

L8124A or C

Aquastat/relay

Circulator 1

Circulator 2

To burner control

24 vac to 3-wire

thermostat

WMR-21

120 VAC

Hot

Neutral

Hot

Neutral

Ground

screw

85905

24 VAC

120 VAC

Thermostat or

isolated contact

to activate relay

Normally open

contact out

Normally open

contact out

Remove factory-

installed jumper from

L1 to 3 to use 3–4

as isolated contacts.

24 vac to 3-wire

thermostat

WMR-21

120 VAC

Hot

Neutral

Ground

screw

85906

24 VAC

120 VAC

Common

Thermostat or

isolated contact

to activate relay

Remove factory-

installed jumper from

L1 to 3 to use 3/4/4

as isolated contacts.

Common

24 vac to 3-wire

thermostat

Normally open

Normally closed

120 VAC

Hot

Neutral

WMR-22

Ground

screw

120 VAC field wiring

120 VAC factory wiring

120 VAC ground lead24 VAC field wiring

24 VAC factory wiring

Legend

Weil-McLain WMR-21 User manual

Brand: Weil-McLain

Model: WMR-21

Category: Electrical relays

Type: User manual

This manual is also suitable for

WMR-22

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Weil-McLain WMR-21 User manual

This manual is also suitable for

Weil-McLain WMR-21 User manual

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