![background image](http://html.mh-extra.com/html/milwaukee/gsa-075/gsa-075_manual_1797697016.webp)
GSA
Gas-Fired Steam Boilers –
Boiler Manual
16
Part Number 550-110-738/1012
6 Field wiring
For your safety, turn off electrical power supply at
service entrance panel before making any electrical
connections to avoid possible electric shock hazard.
Failure to do so can cause severe personal injury
or death.
Wiring must be N.E.C. Class 1.
If rollout thermal fuse element wire supplied with
boiler must be replaced, type 200 °C wire or
equivalent must be used. If other original wiring
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.
Electrical installation must comply with:
1. National Electrical Code and any other national, state,
provincial or local codes or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code, and any
local codes.
Wiring connections
Boiler is shipped with controls completely wired, except spill switch
and vent damper. See wiring diagram in the GSA Spark Ignition
Control Supplement.
Thermostat
1. Connect thermostat as shown on wiring diagram on boiler.
2. Install on inside wall away from influences of drafts, hot or
cold water pipes, lighting fixtures, television, sunrays or
fireplaces.
3. If thermostat has a heat anticipator, set heat anticipator in
thermostat to match power requirements of equipment
connected to it. See boiler wiring diagram (on boiler, or in
Spark Igntion Control Supplement) for recommended setting.
For other devices, see manufacturer’s specifications. Wiring
diagram on boiler gives setting for control module and gas
valve. Also see instructions with thermostat.
Junction box
Connect 120 VAC power wiring (Figure 18). A separate electrical
circuit with a fused disconnect switch (15 amp. recommended)
should be used for the boiler.
Figure 18
Field wiring connections — service switch and thermostat (or end switch) provided by installer