Rheem RTHW25 Manuel

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

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL

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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 ……………………………………………………….………. 9

SECTION 3: OPERATION …………………………………………………….……..……….. 10

3.1 Thermostat Model (Carel PJEZ Controller) …………………..…………..…..... 10

3.2 Rheem IQTM Model (Intelligent Controller) ……………………………………… 10

3.3 De-Icing …………………………………………………………………………….. 11

SECTION 4: MAINTENANCE ………………………………………………………………… 11

SECTION 5: TROUBLESHOOTING ………………………………………………………… 12

5.1 Thermostat Model ………………………………………………………………… 12

5.2 Rheem IQTM Model ……………………………………………………………….. 13

SECTION 6: INSTALLATION SCHEMATIC DRAWING ………………………………….. 14

SECTION 7: WARRANTY …………………………………………………………………….. 14

The End

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL

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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. The units

are also manufactured as water-to-water and ground-coupled design.

Each is a fully packaged unit, requiring only electrical and water connections to be made on

installation. A water circulation pump is not supplied with the unit and must be fitted and sized

accordingly to suit the required water flow rate.

Each is factory charged, with refrigerant R407c being ideally suited for commercial or industrial

situations requiring hot water up to 65°C. Refrigerant R134a may also be used for special hot

water applications.

As the performance of the Rheem Thermal Heat Pump varies with ambient operating conditions,

water flow, water temperature and also due to the wide diversity of commercial and industrial

applications, selection of the unit should be done in conjunction with an experienced heat pump

dealer or the manufacturer.

In hot water application, vessels and reticulation containing the heated water should all be

suitably insulated to obtain the optimum performance from the system.

Each Rheem Thermal unit is custom-manufactured to meet specific task/site requirements.

Warm coastal climates may never accumulate ice on the coil. In cooler and/or more volatile

climates removal of any ice buildup is essential and various de-ice mechanism options are

provided.

This manual includes important information in regard to installation, operation, maintenance and

servicing and should be retained for the life of the heater. Correct installation and familiarity with

the operational guidelines given will ensure that the heater gives optimal efficiency and trouble-

free operation over many years.

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.

*Higher heating capacity models are available upon request.

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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.

•

Locating the unit close to other system equipment like the pump, tank, etc. will minimize

friction and heat losses.

•

Free circulation of air across the coil, requires no obstructions on the intake or fan

discharge of Heat Pumps. Do not position the unit with any intake side closer than

1,000mm to adjacent wall, fences, hedges, etc. Ensure that walls, eaves, etc. do not

obstruct the release of discharge air such that this may recirculate in the incoming air

stream of the unit.

•

Service access is required at both ends of the heater. Allow a minimum 850 mm service

access at the compressor end if possible for units up to 80 kW. For units 100 kW and

above 1000 mm access at the compressor end is required.

•

Where multiple heat pumps are to be installed, follow the required minimum clearance

indicated in the heat pump catalogue.

•

The Heat Pump requires a concrete slab. Rubber mounts shall be installed between

the unit and slab.

•

Local building authorities should be consulted for regulations concerning minimum

installation distance from pool or other amenities.

•

Units to be used in areas having highly corrosive atmosphere, must be specified at time

of ordering.

•

Consideration should be given to the operating noise, wherever possible the exhaust

should be directed away from the occupied areas.

•

To ensure proper drainage of the Heat Pump, make sure that the unit is located at a

slightly tilted angle with the drain on the downhill side of the unit. This can be done by

making the concrete slab slightly higher at one end or lifting one end of the unit by

rubber mounts.

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL

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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

•

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.

•

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.

•

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.

•

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.

•

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

•

Diagram 1 shows a typical plumbing schematic.

•

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.

•

All Plumbing should be carried out by qualified tradesman.

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RECOMMENDED CIRCULATING PUMP FLOWRATE

UNIT

FLOWRATE L/S

RTHW25

1.01

RTHW30

1.16

RTHW40

1.57

RTHW50

2.09

RTHW65

2.17

RTHW80

3.13

RTHW105

4.19

RTHW135

5.41

1.2.1 Water Quality

The heat pump must be installed in accordance with this advice to be covered by the

Rheem Thermal Warranty.

This heat pump is manufactured to suit the water conditions of most public reticulated

water supplies. However there are some known water chemistries which can have a

detrimental effects on the heat pump and its operation and / or life expectancy. If you

are unsure of your water chemistry, you may be able to obtain information from your

local water supply authority. This heat pump should only be connected to a water supply

which complies with these guidelines for the Rheem Thermal warranty to apply.

1.2.2 Change of Water Supply

The changing or alternating from one water supply to another, e.g. a rain water supply,

bore water supply, desalinated water supply, public reticulated water supply or water

bought in from another supply, then water chemistry should be tested to ensure the

water supply meets the requirements given in these guidelines for the Rheem Thermal

warranty to apply.

1.2.3 Saturation Index

The saturation index (SI) is used as a measure of the waters corrosive

or scaling properties. 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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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.

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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.

Provided in the nominated lead-unit (i.e. the control heat pump) with relays fitted to the

slave units to allow control wiring to be run to these units.

The thermostat sensor is the controlling device in the heating system. This determines

whether the heat pump unit should run and is activated in response to the parameters

set for temperature control. That is, the heat pump will run when the entering water

temperature (EWT) or tank temperature is less than the desired set point (normally with

a 2°K split) and stop running when the EWT is a set point. The heat pump will likewise

not run without water flow so there is a very direct link between the heat pump, hot

water recirculating pump and thermostat controller.

The thermostat sensor can be located in the hot water tank with control wiring back to

the water recirculating pump. The operation of the recirculating pump will be controlled

by tank temperature, with water flow to the heat pump activating its operation. This

approach reduces recirculating pump and heat pump run-hours and duty. Contact

manufacturer at time of ordered to discuss wiring requirements.

•Rheem IQTM Intelligent controller is provided as an option. It is an advanced control

system to perform BMS monitoring, error/fault diagnostics, etc. There are two types of

installation of Rheem IQTM, 1) mounted on the external panel of the heat pump, 2) wired

to a separate control panel (optional). Refer to the Owners Guide and Installation

Instructions supplied with the heat pump for information regarding system installation

and product application.

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL

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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.

The unit should have unrestricted supply of fresh air to the coil and exhaust air

removed from closed in areas.

The unit should stand on a firm base with fall to take condensate or rain water away

from the compressor compartment and to the unit’s drainage at the plumbing end.

Noise should be directed away from living areas.

Water connected correctly as indicated.

Condensate drain runs to waste.

Unit is wired correctly and has full amperage,

Unit is not to be started without flow of water.

The thermostat, reset button and/or Rheem IQTM controller are set.

RHEEM THERMAL AIR SOURCE HEAT PUMP INSTALLATION, MAINTENANCE & SERVICE MANUAL

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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.

•As water usage occurs, mains water will enter the storage tank, lowering the overall stored

water temperature, which in turn, activates the Heat Pump. The Heat Pump will run until

the water temperature (at the sensing point) reaches set point.

3.1 Thermostat Model (Carel PJEZ Controller)

To check set point, push and hold the “Set” button for 1 second, current set point will be

displayed, push the “up” or “down” arrows to adjust the value. Press “set” to confirm the

value.

a) Adjusting the differential or Hysteresis “All parameters” screen must be accessed.

b) Press and hold “Set” for approx. 5 seconds, PS will be displayed.

c) Press “Set” then “Arrow up” till the password value “22” is displayed “PS” will be

displayed

d) Press “Arrow up” unit parameter “rd” is displayed.

e) Press “Set” Value will be displayed.

f) Press “Arrow up” or “Down” to set the desired value.

g) Press “Set”

h) Press and hold “Set” for approx. 5 seconds, until temperature is displayed to save

values.

3.2 Rheem IQTM Model (Intelligent Controller)

Refer to “

Rheem IQ Owner’s Guide and Installation Instructions

”Manual and/or the

provided Operations and Maintenance Manual for the respective project.

The manufacturer’s detailed full Instructions on the operation of the controller will be supplied

with the unit and reference may also be made to these instructions.

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