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The HPWH refrigeration circuit shall contain scroll compressor(s) with a maximum of 15-hp per circuit, factory
charged with R-410A refrigerant, air-source evaporator(s), water-source condenser(s), EEV regulated flow, EEV
regulated vapor injection circuit, and 4-way valve to reverse the refrigeration circuit during defrost cycles.
The water-source condenser circuit shall be provided with one of two factory options:
A.
Double wall, brazed plate heat exchanger
with airgap and leakage ports. This option to be utilized with
direct heating of potable hot water. When this feature is selected, factory mounted heat-trace will be
provided on all internal hydronic components, wired to a unit mounted 115v/1ph/60hz terminal strip
intended for field provided emergency power source.
B.
Single wall, brazed plate heat exchanger
. This option to be utilized with indirect heating of potable hot
water. Typical applications include glycol circuits for exterior piping that transfer heat via an interior
mounted double wall heat exchanger that services the domestic hot water circuit. Heat-trace is not
provided with this option because glycol operation is assumed.
Supply and return piping shall be 316L stainless steel with flanged supply and return connections. Clean out
ports (1” NPT) shall be provided on the supply and return headers to allow for preventive maintenance of the
heat exchanger circuits. Pipes and heat exchangers to be insulated with 40mm rubber cotton insulation.
Operation guidelines for defrosting and drainage in winter
In winter, when the temperature is lower than 32°F (0
℃
), if the unit is powered off for any reason, then water
must be drained from the unit to prevent damage to the hydronic components. Draining the system of water
shall be carried out as follows:
Operational guideline
:
Isolate the inlet and outlet water connections external to the unit. Ensure the internal isolation valves on each
heat exchanger are open. Open the drain cap at the bottom of inlet water pipe to drain water. Keep the drain
port open until the next use. Open the vent valve to facilitate complete draining of water from the heat
exchangers. Using compressed air or a wet/dry vacuum to assist water removal is recommended.
Содержание ccHPWH Series
Страница 11: ...8 III Product specification 1 Dimensions Unit inch ccHPWH275 S ccHPWH275 D ...
Страница 12: ...9 ccHPWH550 S ccHPWH550 D ...
Страница 26: ...23 2 Wiring diagram ccHPWH275 S ccHPWH275 D ...
Страница 27: ...24 ccHPWH550 S ccHPWH550 D ...
Страница 42: ...39 Schematic diagram of control wiring and code dialing of each module ...