About Your Water Heater - Rheem MPi 554 Series Owner's Manual And Installation Instructions

Air sourced heat pump water heater

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Owner's manual and installation instructions (48 pages)

Table Of Contents

Table of Contents

WATER HEATER APPLICATION

This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable

water. Its use in an application other than this may shorten its life.

MODEL TYPE

Your Rheem

air sourced heat pump water heater is designed for outdoor installation only. The model you

have chosen is a RheemPlus 554 series model. The 554 325 model water heater is recommended for

connection to a minimum 16 hour per day power supply. The 554 410 model water heater is recommended

for connection to a 24 hour per day power supply.

A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an

electricity account will depend on the tariff arrangement of the water heater replaced and where you live.

Contact your energy provider for more information on tariff arrangements and cost comparisons.

The Rheem air sourced heat pump water heater has a Rheemglas

water heater‟s evaporator absorbs heat from the surrounding air and transfers this heat into the water.

When hot water is drawn off and cold water enters the tank, the thermostat

activates a fan, a compressor and a circulator. The fan draws outside air in

through the air inlet louvres at the side of the heat pump module and the

pump circulates water from the bottom of the storage tank through a heat

exchanger. Heat is absorbed from the air by an evaporator and transferred

into the water through the heat exchanger. The resulting cold air is then

discharged through the air outlet grille back to atmosphere and the heated

water is circulated back into the storage tank. This process continues while

heating is required until the water in the storage tank reaches a

temperature of 60°C.

Even on cloudy or cold days, heat is drawn from the surrounding air. The

heat pump will operate when the ambient air temperature is between a

minimum of 3°C to 5°C and maximum of 45°C to 55°C. The booster

heating unit will operate when the ambient air temperature is outside of this

temperature range if heating is required. The efficiency of the water heater

increases as the ambient air temperature increases within the operating

range of the heat pump.

Automatic safety controls are fitted to the water heater to provide safe and efficient operation.

ELECTRIC BOOSTING

Ice may begin to form on the evaporator reducing the heat pump efficiency, when the ambient air

temperature falls below 7°C and the heat pump has been operating for an extended period. At ambient air

temperatures below 3°C to 5°C, the water heater deactivates the heat pump operation and switches to the

booster heating unit. During this period the evaporator will defrost if necessary.

At ambient air temperatures above 45°C to 55°C, the water heater deactivates the heat pump operation and

switches to the booster heating unit.

The water inside the tank will be heated to a temperature of 70°C by the electric booster heating unit if

heating is required. The temperature setting of the thermostat controlling the booster heating unit is not

adjustable and is set at 70°C.