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Series 3
Connect water piping
(continued)
Piping boiler in refrigeration systems
(Figure 12)
•
Install boiler so that chilled medium is piped in parallel with
heating boiler. Use appropriate valves to prevent chilled me-
dium from entering boiler. Consult AHRI Installation and
Piping Guides.
•
If boiler is connected to heating coils located in air handling
units where they can be exposed to refrigerated air, use fl ow
control valves or other automatic means to prevent gravity
circulation during cooling cycle.
Figure 12 Piping boiler in a system with chiller
Connect wiring
General wiring requirements
Electric shock hazard
injury or death if power source, including service
switch on boiler, is not disconnected before install-
ing or servicing.
Installations must follow these codes:
•
United States:
National Electrical Code, ANSI/NFPA 70, latest edition and
any additional national, state or local codes.
•
Canada:
CSA C22.1 Canadian Electrical Code Part 1 and any local
codes.
18
— Boiler Manual
WATER BOILER
. Can cause severe personal
Connect wiring
Wire requirements
•
Wiring must be N.E.C. Class 1.
•
If original wire supplied with boiler must be replaced, type
105 °C wire or equivalent must be used.
•
Supply wiring:
• Boiler only — 14 gauge or heavier.
• Boiler with optional AFM — 12 gauge or heavier.
Electrical requirements
•
Boilers not equipped with an AFM can be supplied by a 15-
amp service.
•
Boilers equipped with an AFM require a 20-amp service.
Electrical grounding
•
Provide electrical ground at boiler as required by codes.
Wiring entrances (see Figure 13)
Terminal strip access
•
Remove the two retainer screws in the jacket top panel (at rear
of the boiler) and remove the jacket top panel.
•
Release the Control Pod cover by loosening the retainer screw
in the top center of the cover. Swing the cover open to reveal
the boiler terminal strip.
Figure 13 Terminal strip access
Part number 550-142-182/1014
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