ICE AIR ccHPWH Series, Installation And Maintenance Manual

Page: 18 / 50

15
4.3. Installation requirements
A means of isolating the unit from the main system flow is required for service. A bypass value is recommended
to allow the system piping to be cleaned without introducing sediment into the heat pump heat exchangers.
Install a 40 mesh or finer filter near the inlet of the unit. Pressure gauge and temperature sensor on the inlet
and outlet pipes are recommended to allow for ease of monitoring operation.
The water flow must be properly balanced to ensure the water flow does not exceed the maximum flow rate.
When operating at full load, the temperature difference between inlet and outlet should be between 7°F and
11°F (4°C and 6°C).
External piping should be properly supported. The unit’s pipe connections should not carry the weight of the
piping.
All low points of the water system must be provided with drainage interfaces to facilitate the drainage of water
in the water system. All high points must be provided with vent valves to facilitate the evacuation of air in the
pipeline. Vent and drain ports should be left uninsulated for ease of maintenance.
The pipe should be thoroughly flushed and free of debris prior to start-up. Care must be taken
during installation to ensure no foreign debris enters the waterside or air-side heat
exchangers.
4.4. Water quality requirements
A. Water quality considerations
If the unit is applied to a closed (HVAC) loop then scale build up is unlikely; and single wall heat exchangers
are permissible. For units directly heating potable water, double wall heat exchangers are required, and the
quality of the supply water and means of filtration and softening the water will affect the amount of potential
scale and sediment build-up within the heat exchangers. Care should be taken to mitigate scale and sediment
building up. Scale and sediment build up will derate performance and can ultimately cause system failure.
NOTE: Clean out ports are located on the supply and return headers of the unit. Annual backflushing of the
heat exchanger assemblies with a potable water rated acid is recommended to dissolve any scale buildup and
flush away any sediments that may accumulate.
The water quality, such as pH value, conductivity, chloride ion concentration, sulfur ion concentration, etc.
should be analyzed before use. Water must be filtered and softened with water softening equipment before
entering the water heater’s heat exchangers.
B. Applicable water quality standards of unit