Rheem RHP-2805 Series Technical Document

Owner’s Guide

and

Installation Instructions

Air Sourced Heat Pump Water Heater

RHP-2805 Series

This water heater must be installed and serviced by a qualified person.

Please leave this guide with the householder.

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Contents

Packing List.....................................................................................................................................................2

General Precautions ......................................................................................................................................3

Technical Specifications ................................................................................................................................5

Installation Instruction....................................................................................................................................6

Pipe Connection ............................................................................................................................................. 9

Wiring Diagram.............................................................................................................................................13

Operation and Usage................................................................................................................................... 14

Maintenance .................................................................................................................................................20

Common Faults and Solutions ...................................................................................................................22

Replacement Parts.......................................................................................................................................24

Warranty Policy.............................................................................................................................................25

Packing List

No. Name Qty.

1 Heat pump water heater 1

2 T&P relief valve 1

3 Non-return valve 1

4 Drain valve 1

5 Water outlet connection 1

6 Condensation drainpipe 1

7 Instruction manual 1

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General Precautions

Please read this instruction manual carefully before taking any installation or operation action

and keep this manual in a safe place for future reference.

•Rheem Manufacturing Company group of companies (hereinafter referred to as “Rheem”).

•The water heater is intended to be installed by a qualified technician. Rheem shall not be liable

for any loss or consequences caused by improper operation and performance faults, like pipe

leakage, machine malfunction or any other damages due to the installation of personnel not

approved by Rheem or using unauthorized installation materials.

•The water heater is suitable for domestic usage. Commercial purpose will shorten its life cycle.

•A suitable floor drain that enables water to be drained away to a safe location must be installed

near the water heater to prevent damage to other facilities.

•The working voltage of water heater is 220-240V~, violation of the range will cause operation

failure.

•The water heater must be installed as per national wiring standards.

•Neither unqualified and damaged cables nor unqualified, aging socket can be used, otherwise,

electric shock, short circuit, fire and other accidents may easily occur.

•A special circuit and circuit breaker protection must be provided for the electrical connections.

The compliance of meter, circuit breaker, wire diameter and socket shall be inspected by those

skilled in this art.

•The power supply to the water heater must not be switched on until the water heater is filled with

water.

•In case of abnormal conditions of grounding system of other equipment, user should

immediately stop using the water heater, unplug the power supply or cut off all connections with

power supply circuit, and contact the maintenance people of the manufacturer to solve the

problem.

•If the power cable is damaged, it can only be replaced by qualified personnel approved by the

company.

•A non-return valve must be installed for the cold water inlet pipe of the water heater.

•Water temperature exceeding 50°C may cause scald to human body. Please use before mixed

with cold water.

•When you don’t use water heater for a long-time in winter, please switch off and discharge your

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water heater to prevent freezing damage.

•Pressure relief device must be installed. For safety reason, DO NOT change installation position

of the relief device or block its exit. A drain tube must be connected to the relief valve and kept

going down. Water flowing out from the tube shall be discharged to suitable floor drain.

•Do not attempt to install, repair or remove the water heater, all work must be carried out by a

qualified technician.

•Do not insert any foreign objects into air inlet or outlet to avoid injury.

•If the water heater begins to operate abnormally (i.e., excessive noise, emit smoke, peculiar

smell, etc.,), stop operation of the equipment, isolate power supply promptly and contact the

Service Department. Do not attempt to repair the unit by yourself.

•Max. water supply pressure is 0.68MPa.

If the requirements in this instruction are not strictly followed, a fire accident may occur,

causing property damage, personal injury, or death!

Warning: The power socket must be grounded reliably. It is strictly forbidden to use the

water heater without a reliable grounding measure!

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Technical Specifications

Model RHP180-2805 RHP280-2805

Power supply 220-240V~ 50Hz

Circuit fuse - model number T3.15AL250V

Circuit fuse - parameters 3.15A 250V

IP rating IP24

Heat pump heating capacity* 2800W

Heat pump power input/current* 666W/3A

Coefficient of Performance (COP)* 4.2

Heat pump heating water capacity* 60L/h

Refrigerant (charging amount) R134a (0.9 kg)

Element rating/current 2500-3000W/11.4-12.5A (@220-240V)

Max. power input/current 4000W/16.7A

Operation ambient temperature range -7～43°C

Water temperature adjustment range 35～75°C

Rated water temperature 65°C

Max. water temperature of heat pump 70°C

Water side

Heat exchanger type Microchannel

Tank capacity 180L 280L

Maximum Pressure 850 kPa

Inlet/outlet connection RP3/4" / DN20

Relief/drain valve connection RP3/4" / DN20

Air side Heat exchanger type Internal thread tube with hydrophilic

aluminum foil

Air outlet Back exhaust

Dimension Diameter 525 mm 648 mm

Height 1810 mm 1815 mm

Heater weight - Empty 96 kg 120 kg

Heater weight - Full 276 kg 400 kg

*Testing conditions: power supply 220V~ 50Hz, ambient temperature 20˚C/15°C (dry

bulb/wet bulb), and water temperature from 15˚C to 55˚C for water heater operation.

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Dimensions

Condensate

Drain

Hot Water

Outlet

T&P Relief

Valve

Display Board

ECO Elec Quick

Mode

Model A(mm) B(mm)

RHP180-2805 1130 1810

C(mm) D(mm)

525 576

Cold Water

Inlet

Drain Valve

Power

Cable

1095 1815 648 702RHP280-2805

Installation Instruction

Installation Location

•Do not install this water heater in a place where freezing may occur.

•The water heater should be installed as close as possible to the hot water point with the highest

frequency of use.

•There should be enough clearance around the water heater so that the entire unit can be

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removed for repair or replacement if necessary. The electrical junction box and T&P relief valve

should be oriented for easy maintenance, and the nameplate should be easy to read.

•The water heater should be installed on the floor to ensure that it is placed vertically and avoid

tilting. The building must be able to withstand the total weight of the water heater after being

filled with water without severe vibration.

•The water heater should be placed on a refractory base with a height of not less than 50mm,

and there should be a high temperature resistant floor drain with unobstructed drainage near

the base to prevent damage to other facilities in case the water heater or pipeline leaks.

•The installation location should be well ventilated, no obstacles that hinder the wind in and out,

and should not be exposed to rain and direct sunlight.

•The water heater should be installed at location where its running noise and exhaust will not

affect the neighbors.

•Make sure there is no leakage of flammable and corrosive gas at the installation location; no

oily smoke and dust; no or only small fluctuations of power supply voltage.

Installation Clearance

150mm

≥500mm

ECO Elec Quick

Mode

Floor Drain

Air Inlet Air Inlet

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Installation Precautions

Wiring work must be done by a qualified electrician and must meet electrical safety requirements.

When the user needs to install and move, please contact the company's after-sales service center

for professional help. DO NOT install and move by yourself. Otherwise, the company will not be

responsible for any damage and failure caused and warranty of water heater will be invalid.

Warning: If the water heater is installed on the roof of a building that is vulnerable to

lightning strikes, the water heater must be protected by lightning protection facilities!

Note: After the machine is in place, be sure to let the water heater stand for more than

30 minutes before turning on the power!

Note: Please transport the water heater according

to the state when it leaves the factory. Do not

move the water heater at an angle of more than

30°, let alone place the machine vertically, and do

not disassemble or assemble it yourself!

（C ≤

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Pipe Connection

Pipe Connection Diagram

Floor Drain

Condensate

Drain

Outlet TPR Valve

Inlet

Drain

Valve

Cold Water

Hot Water

Refractory

Base

TPR Valve drain

Non-return

Valve

Shutoff Valve

itchen

WashBatheLaundry

Connection Instruction

Material Requirements

Because the water heater and its piping system will bear pressure from tap water, all water-side pipes

must be made of temperature-resistant, pressure-resistant, and corrosion-resistant metal or new-type

plastic material. Pressure resistance performance of the pipes must not be lower than the relief

pressure of the T&P valve, while the temperature resistance must not be lower than 99°C.

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Cold/Hot Water Pipe Connection

1. Connection size

Rp 3/4"

2. Pipeline Size

To ensure the best performance, the pipe size should be selected according to the specific

installation needs. The following are the recommended pipe sizes.

Hot water pipe: Main pipe - 20mm（3/4"）; Branch pipe ≥ 15mm（1/2"）.

Cold water pipe: The size of the cold-water pipe should be the same or larger than the size of

the hot water pipe used.

3. Cold Water Connection

The cold-water inlet is at lower part of the water heater and should be directly connected with

tap water. As shown in the figure, first connect a shut-off valve, then connect a non-return

valve on the side close to the heater, and finally connect a union.

If supply water pressure exceeds the rated max. pressure (680 kPa), a pressure limiting valve

shall be connected behind the non-return valve. If supply water quality does not meet the

specific water quality requirements, an expansion control valve shall be used.

4. Hot water connection

The hot water supplied by the water heater has a relatively high temperature and cannot be

used directly for washing. It must be mixed with cold water. Therefore, the cold and hot water

mixing valve should be installed at the hot water use point, as shown in the figure.

Note: The water heater has a hot water pipe for the outlet connector and a joint bushing

on the inlet connector. These devices are installed when the water heater leaves the factory

and must not be removed or damaged during installation. When the threaded joint is

screwed in, these devices will naturally be installed to the correct depth.

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