Electrical; Control Design - Rheem RTHW25 Installation Maintenance And Service Manual

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL
1.2.4 Chloride and PH
Where the chloride level exceeds 250 mg / l the Rheem Thermal warranty does not
apply to the heat pump. In a high chloride water supply, the water can corrode stainless
steel parts and cause them to fail.
Where the PH is less than 6.0 the Rheem Thermal warranty does not apply to the heat
pump. PH is a measure of whether the water is alkaline or acid. In an acidic water
supply, the water can attack stainless parts and cause them to fail.
Water with a PH less than 6.0 may be treated to raise the PH. The water supply from a
rainwater tank in a metropolitan area is likely to be corrosive due to the dissolution of
atmospheric contaminants.

1.3 Electrical

• All electrical work must be carried out by licensed electricians and all the wiring should
be carried out to AS3000 latest edition wiring standards.
• Refer to the internal electrical wiring diagram supplied with the units before proceeding
with electrical work. Cable and fuse sizing must be correct relative to unit specified
Volts/Hz/Phase.
• An isolating switch must be fitted adjacent to the unit up to 80 kW, units above 100 kW
have a factory installed isolation switch.
• To install the unit, remove the electrical service panel. No conduit entry points are
provided, the installer has to drill an appropriate hole in the desired location. Earth and
Neutral wires need to be connected to the appropriate terminal. Line voltage to
terminals L1 and L2 and L3 if unit is three phase.
• Water must be running through the unit before the unit is switched on.

1.4 Control Design

Standard Rheem Thermal heat pumps intended for individual installation are
manufactured with in-built thermostat control and refrigeration pressure safety
switches
• Typically, the thermostat is mounted on the outside panel and displays entering water
temperature, with the sensor being located in a well to the inlet water pipe inside the
unit.
RHEEM HOT WATER SYSTEM (ASEAN REGION) 7 | P a g e