RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL
RHEEM HOT WATER SYSTEM (ASEAN REGION)
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P a g e
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For the plant-room installation, make sure that sufficient fresh air is available via
provision of inlet grills in building design, etc. Exhaust air from the unit must be
discharged by a duct away from the fresh air supply. Proposed ductwork should be
submitted to the manufacturer for approval. The unit should never be installed in a fully
enclosed area.
1.2 Plumbing
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It is essential that the water recirculating pump and pipe sizes be engineered to suit the
particular application, giving correct water flow through the heat pump. Inadequate or
excessive water flow detracts from heating efficiency and can lead to damage to the
unit. Selection of the recirculating pump must be made in accordance with the design
flow rate and pressure drop as per the manufacturer’s
specification.
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Consult Rheem ASEAN specialists and/or your local distributor for recommendations
for optimum flow rate. Assistance will be provided in relation to optimum plumbing
design and pump selection.
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Water connections on the unit are clearly marked as water inlet and water outlet. The
water lines should be as short as conditions will permit. The size of these lines is not
necessarily the same as unit connections.
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Breakable unions should be installed on both inlet and outlet pipes to facilitate
maintenance and water drainage of the system. If the unit is situated below the level
an open holding tank l, shut off valves should be fitted on the water side of both unions
so that removal of the machine is possible without draining the system.
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Caution should be taken if soldering to avoid damage to the thermostat sensor. The
sensor should be removed prior to soldering and refitted once the pipe has cooled. The
sensor is located in a well on the return water pipe
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Diagram 1 shows a typical plumbing schematic.
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Where multiple units are installed, the heaters must be installed in parallel to equalize
pressure drops and balance flow through the heaters. Systems of three or more heat
pumps require a plumbing loop.
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All Plumbing should be carried out by qualified tradesman.
