GWA
Gas-Fired Water Boilers –
Boiler Manual
14
Part Number 670 01 1001 00
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 as supplied with
boiler must be replaced, type 200 °C wire or equivalent
must be used. If other 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.
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 Part 1, and
any local codes.
Wiring connections
Boiler is shipped with controls completely wired, except spill switch
and vent damper. See wiring diagram on page 19 for standing pilot
ignition boiler or Control Supplement for spark-ignited pilot boiler.
Circulator is shipped loose, but wiring harness is pre-attached to
the boiler. Connect wires in circulator junction box.
Figure 11
Field wiring connections — service switch and thermostat (or end switch) provided by installer
5
Field wiring
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. If connected directly to boiler, set for 0.4 amps.
For other devices, see manufacturer’s specifications. Wiring
diagram on boiler gives setting for control module and gas valve.
Also see instructions with thermostat.
Wiring multiple zones
See zone valve manufacturer’s literature for wiring and application.
A separate transformer is required to power zone valves. Zoning
with circulators requires a relay for each circulator.
Junction box (furnished)
1. Connect 120 VAC power wiring (Figure 11).
2. Fused disconnect or service switch (15 amp. recommended)
may be mounted on this box. For those installations with local
codes which prohibit installation of fused disconnect or service
switch on boiler, install a 2 x 4 cover plate on the boiler junction
box and mount the service switch remotely as required by the
code.
GWA
Gas-Fired Water Boilers –
Boiler Manual
23
Part Number 670 01 1001 00
Handling ceramic fiber and fiberglass materials
REMOVAL OF COMBUSTION CHAMBER LINING OR BASE PANELS
The combustion chamber lining or base insulation panels in this product contain ceramic fiber materials. Ceramic
fibers can be converted to cristobalite in very high temperature applications. The International Agency for Research
on Cancer (IARC) has concluded, "Crystalline silica inhaled in the form of quartz or cristobalite from occupational
sources is carcinogenic to humans (Group 1).":
■
Avoid breathing dust and contact with skin and eyes.
•
Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for
cristobalite at the time this document was written. Other types of respirators may be needed depending on
the job site conditions. Current NIOSH recommendations can be found on the NIOSH web site at http://
www.cdc.gov/niosh/homepage.html. NIOSH approved respirators, manufacturers, and phone numbers are
also listed on this web site.
•
Wear long-sleeved, loose fitting clothing, gloves, and eye protection.
■
Apply enough water to the combustion chamber lining or base insulation to prevent airborne dust.
■
Remove combustion chamber lining or base insulation from the boiler and place it in a plastic bag for disposal.
■
Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
■
Eye: Irrigate immediately
■
Breathing: Fresh air.
REMOVAL OF FIBERGLASS WOOL — OR —
INSTALLATION OF FIBERGLASS WOOL, COMBUSTION CHAMBER LINING OR BASE
PANELS:
This product contains fiberglass jacket insulation and ceramic fiber materials in combustion chamber lining or base
panels in gas fired products. Airborne fibers from these materials have been listed by the State of California as a
possible cause of cancer through inhalation.
■
Avoid breathing dust and contact with skin and eyes.
•
Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for
fiberglass wool at the time this document was written. Other types of respirators may be needed depending
on the job site conditions. Current NIOSH recommendations can be found on the NIOSH web site at http://
www.cdc.gov/niosh/homepage.html. NIOSH approved respirators, manufacturers, and phone numbers are
also listed on this web site.
•
Wear long-sleeved, loose fitting clothing, gloves, and eye protection.
■
Operations such as sawing, blowing, tear out, and spraying may generate airborne fiber concentration requiring
additional protection.
■
Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
■
Eye: Irrigate immediately
■
Breathing: Fresh air.
10 Service and maintenance
continued
