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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 ow
control valves or other automatic means to prevent gravity
circulation during cooling cycle.
. Can cause severe personal
injury or death if power source, including service
switch on boiler, is not disconnected before install-
ing or servicing.
• 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 – latest edition,
and any local codes.
Connect wiring
• 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.
• Boilers should be supplied by a 15-amp service.
• Provide electrical ground at boiler as required by codes.
Wiring entrances (see Figure 13)
• Remove the two (2) 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.
• Remove the Control Pod cover to facilitate wire routing. (To
(continued)
Part number 550-143-013/0621
18
Series 3
Connect water piping Connect wiring
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