IBC AHU 800, Installation & Operating Manual

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2.6 Cold Air Sentry (a.k.a. Freeze Protection)
The tankless water heater installation shown in Basic installation with tankless water heater on page
30 above lends itself to the Cold Air Sentry feature, i.e. freeze protection: see Section 4.1 Sequence
of Operation for details.
Alternatively, with the addition of TT contacts (and app setting Tankless Mode set to Off ) a boiler heat
source can be used for Cold Air Sentry.
2.7 Electrical connections
All electrical wiring to the boiler (including grounding) must conform to local electrical codes and/or
the National Electrical Code, ANS/NFPA No. 70 – latest edition, or the Canadian Electrical Code,
C22.1 - Part 1. In addition, you should refer to the boiler's installation manual.
The control board diagram below shows the various wiring connections such as the thermostat,
accessories, heat pump, and external pump.
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2.6 Cold Air Sentry (a.k.a. Freeze Protection)