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
≥500mm
≥500mm
≥500mm
≥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
Shutoff Valve
K
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.