Weil-McLain 2 Series Manual page 47

®
SlimFit Series 2
Field wiring
safety, turn off electrical power supply at service
entrance panel before making any electrical connec-
tions to avoid possible electric shock hazard. Failure
to do so can cause severe personal injury or death.
The installation must comply with: National Electri-
cal Code and any other national, state, provincial or
local codes or regulations. In Canada, CSA C22.1
Canadian Electrical Code Part 1, and any local
codes.
Do not use 24V from transformer to power
any external devices that are not listed in this
manual.
Wire entrances
Eight knockouts are provided in the top of the cabinet for line
and low voltage wiring. See Figure 51 for locations.
outs. Failure to do so can cause severe personal injury, death
or substantial property damage.
Wiring overview
See details on the following pages for the wiring connections
outlined below:
Required wiring connections
120VAC power to boiler; 120VAC power out to boiler
circulator; system supply and return temperature sensors.
Connections as needed by systems
Thermostat, end switch or other inputs for call for heat.
System zone circulators, valves, relays, etc.
System circulator, when required.
Outdoor temperature sensor.
Optional wiring connections
External limits; Closure switch interlocks (combustion air
damper, flow switch, etc.); 0–10VDC for target or modula-
tion control; remote alarm; additional heat demand con-
tact; and communication cables for boiler networking and/
or building management system interface (MODBUS).
Part number 550-100-180/0917
COMMERCIAL CONDENSING GAS
(see
For your
HAZARD —
through jacket knock-
Continued after
- — Boiler Manual
FIRED WATER BOILER
Wiring must be N.E.C. Class 1. If original wiring
as supplied with boiler must be replaced, use
only type 105 °C wire or equivalent. Boiler must
be electrically grounded as required by National
Electrical Code ANSI/NFPA 70 – latest edition,
and/or the Canadian Electrical Code Part I,
CSA C22.1, Electrical Code.
The boiler when installed, must be electrically
bonded to ground in accordance with the re-
quirements of the authority having jurisdiction
or, in the absence of such requirements, with the
National Electrical Code, ANSI/NFPA 70 – latest
edition, and/or the Canadian Electrical Code
Part I, CSA C22.1, Electrical Code.
Wiring entrances
Line voltage power input
1. Boiler line voltage power — Boiler load: SF1000 — 12.1 Amps;
SF1500 — 20.7 Amps; SF2000 — 23.2 Amps. Provide and install
a fused disconnect or service switch as required by applicable
codes. Fuse or breaker rating must be sized accordingly.
2. Boiler Circ activation circuit — Provide external power for
pump's, 120 VAC/1-phase, size as required for the pump load.
Interrupt pump's hot line with the connections on EP7 screw
terminal. Maximum current rating of relay is 10 Amps.
47