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Part number 550-141-396/0801
6
PER Series 3 Electric-Hydronic Boilers Installation Instructions
Wiring
Part Number
550-224-719/0801
Legend
HIGH VOLTAGE FACTORY WIRING
LOW VOLTAGE FACTORY WIRING
HIGH VOLTAGE FIELD WIRING
LOW VOLTAGE FIELD WIRING
A United Dominion Company
Weil-McLain • 500 Blaine St. • Michigan City, IN 46360-2388
Notes:
Items not provided
1.Thermostat heat anticipator setting must be 0.45 amps.
2.All wiring must be installed in accordance with the requirements of the National Electrical Code and any
applicable national, state or local code requirements.
3.All safety circuit wiring must be N.E.C. Class 1.
4.Use only copper conductors for power input wiring. Do not use aluminum conductors.
5.For 208-volt power supply, remove orange wire and replace with red wire.
6.Maximum circulator motor is 1/6 hp.
PER Series 3
15 KW thru 25 KW
240VAC/single phase/60 hz
2½ min.ON, 15 sec.OFF
OR
B
B
R
R
RD
BK
To
FUSES
CIRCULATOR
TRANSFORMER
TRANSFORMER
CIRCULATOR
EQUIPMENT
GROUND
Connect wire to
last fused terminal
WIRE
NUTS
WIRE
NUTS
Schematic Wiring Diagram
THERMOSTAT
OR END SWITCH
(Note 1)
(Note 6)
(Note 6)
Electrical shock hazard — can cause severe injury or
death. Disconnect power before installing or servicing.
1C
2C
4C
TD1
ED1
ED2
ED3
ED4
CONTACTORS
THERMAL TIME
DELAY RELAYS
ELECTRONIC
TIME DELAY RELAYS
HEATING
ELEMENTS
1K1
1K
TD2
TD3
TD4
H1
H2
H3
H4
2K1
2K
3K
4K
5K
6K
3K1
4K1
5K1
6K1
2K2
3K2
4K2
5K2
6K2
1
1
1
3
3
3
3
1
R
B
R
B
4
2
3
1
3C
L1
N
2K1
2K2
3K1
3K2
4K1
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
30 AMP
15 AMP
4K2
5K1
5K2
6K1
6K2
To:
To:
L2
(240 VAC)
THERMOSTAT
THERMOSTAT
24 VAC
24 VAC
HIGH
LIMIT
HIGH
LIMIT
LOW
LIMIT
LOW
LIMIT
THERMAL TIME
DELAY RELAYS
THERMAL TIME
DELAY RELAYS
ELECTRONIC TIME
DELAY RELAYS
ELECTRONIC TIME
DELAY RELAYS
Ladder Wiring Diagram
EQUIPMENT
GROUND
(Note 1)
F1
F2
F3
F4
F5
2K1
3K1
4K1
5K1
1K
2K
3K
ED1
ED2
ED3
ED4
1C
2C
3C
4C
4K
5K
6K
H1
H2
H3
H4
6K1
2K2
3K2
4K2
5K2
6K2
F7
F8
F9
F10
F11
L1
L2
N
G
G
F6
1K1
HIGH
LIMIT
HIGH
LIMIT
LOW
LIMIT
LOW
LIMIT
CIRCULATOR RELAY
CIRCULATOR RELAY
HEATING
ELEMENTS
(Note 5)