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Air Source Heat Pump Installation,
Maintenance and Service Manual
This booklet is to be carefully read and instructions followed for
efficient and trouble free operation of the
Rheem Thermal Hot Water Heat Pump
Rheem Manufacturing Company (Singapore) Pte Ltd
8 Pandan Crescent
#02-02 Singapore 128464
Tel : 68721161 / Fax : 68721151
Email :
rheem@rheemasia.com
Website : www.rheemasia.com
REV: OCTOBER 2019
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Summary of Contents for Rheem RTHW25
- Page 1 Maintenance and Service Manual This booklet is to be carefully read and instructions followed for efficient and trouble free operation of the Rheem Thermal Hot Water Heat Pump Rheem Manufacturing Company (Singapore) Pte Ltd 8 Pandan Crescent #02-02 Singapore 128464...
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Page 2: Table Of Contents
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL TABLE OF CONTENTS INTRODUCTION ……………………………………………………………………………..….. 3 SECTION 1: INSTALLATION ………………………………………………………………….. 4 1.1 Installation Guidelines ……………………………………………………………… 4 1.2 Plumbing …………………………………………………………………………….. 5 1.3 Electrical …………………………………………………….….…………………… 7 1.4 Control Design ……………………………………………………………………… 7 SECTION 2: COMMISSIONING ……………………………………………………….………. -
Page 3: Introduction
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL INTRODUCTION Rheem Thermal Hot Water Heat Pumps are available in sizes from 20kW to 135kW* nominal output and are suitable for Mechanical, Process and Hydronic heating applications. The unit is most commonly manufactured as air-to-water design, in which it extracts heat from ambient air and transfers this to water, providing a highly energy efficient method of water heating. -
Page 4: Section 1: Installation
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL SECTION 1: INSTALLATION For validity of warranty, installation must be carried out by registered trade person. 1.1 Installation Guidelines • Heating efficiency and output increases with the rise in entering air temperature, as such full advantage should be taken for direct sunlight, typically with evaporator coil facing north-west or facing a heat source like boiler room, etc. -
Page 5: Plumbing
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL • 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. - Page 6 Where the saturation index is less than -1.0, the water is very corrosive and the Rheem Thermal warranty does not apply to the heat pump. In a corrosive water supply, the water can attack copper parts and cause them to fail. Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
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Page 7: Electrical
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. - Page 8 RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL For systems comprised of multiple heat pump units, the thermostat sensor and well may be provided as follows depending on client requirement: Provided loose to allow installation of thermostat controller display in heat pump control panel (located separately to the heat pumps) with probe installed in the hot water storage tank.
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Page 9: Section 2: Commissioning
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL SECTION 2: COMMISSIONING The Rheem Thermal heat pump is fully charged with refrigerant. The following checks should be carried out: Installation and operation instructions should be read prior to commissioning. -
Page 10: Section 3: Operation
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL SECTION 3: OPERATION • The Heat Pump has an internal thermostat located in the return water pipe which maintains storage tank water temperature at the nominated set point. The normal operating range for entering water is between 55°C and 57°C. -
Page 11: Icing
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL 3.3 De-Icing All units include hot gas bypass de-ice. This will occur when to evaporator temperature reaches -4°C, after a period of 30 minutes unit will go into de-ice mode and will terminate when the coil temperature reaches 10°C of when 10 minutes have passed. -
Page 12: Section 5: Troubleshooting
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL SECTION 5: TROUBLESHOOTING 5.1 Thermostat Model 5.1.1 Machine Will Not Start As a safety feature, the Heat Pump has a programmed time delay between provision of power and unit start, usually a few minutes. Wait for this time delay before making the following checks: Check electrical supply to the unit is ON. -
Page 13: Rheem Iq Tm Model
RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL 5.1.3 Compressor Will Not Run Possible Cause Possible Solution Overload switch cut- Find cause of overload and reset overload out (if fitted) switch. System stopped on A disturbance in water flow may have safety lockout triggered the safety lockout. -
Page 14: Section 6: Installation Schematic Drawing
Rheem Manufacturing Company Singapore Pte Ltd undertakes to provide twelve (12) months warranty for Rheem Thermal Heat Pumps only against manufacturing defects during the Defects and Liabilities Period (DLP) effective upon delivery date – subject to be confirmed by your local Rheem distributor.
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