Oilon RE 35 User manual

RE01 1445EN
Installation and operation manual
Oilon RE 35 – RE 85
Read these instructions carefully before installation, use, or maintenance

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Contents
1. Introduction
1.1. Overview of this manual...............................................................................3
1.2. Transportation and storage.......................................................................... 3
1.3. Delivery content, optional equipment, and accessories............................... 4
1.4. Control system.............................................................................................. 5
1.5. Operating principle........................................................................................6
1.6. Main features................................................................................................ 7
1.7. Heat pump system dimensioning................................................................. 8
1.8. Collecting heat.............................................................................................. 8
2. Installation
2.1. Installation site requirements........................................................................9
2.2. Main components........................................................................................11
2.3. Connections and dimensions..................................................................... 14
2.4. Piping diagrams.......................................................................................... 17
2.5. Electrical connections................................................................................. 23
2.6. Filling brine circuit.......................................................................................25
2.7. Filling heating network................................................................................27
3. Commissioning
3.1. Fuses and switches.................................................................................... 28
3.2. Prerequisites for commissioning.................................................................28
3.3. Commissioning the system.........................................................................28
3.4. Testing relay............................................................................................... 29
3.5. Adding heating circuits............................................................................... 30
3.6. Configuring heating curve...........................................................................30
3.7. Connecting solar heating............................................................................34
4. Operation
4.1. Control panel...............................................................................................36
4.2. Changing settings....................................................................................... 38
4.3. Changing user level....................................................................................40
4.4. Setting language......................................................................................... 40
4.5. Setting time and date................................................................................. 40
4.6. Configuring domestic hot water settings.................................................... 40
4.7. Operating lines............................................................................................41
5. Maintenance
5.1. Annual maintenance................................................................................... 47
5.2. Cleaning the circuit filter............................................................................. 47
5.3. Troubleshooting...........................................................................................47

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6. Technical data
6.1. Heat pump technical data...........................................................................51
6.2. Condenser and ground circuit flow and pumps..........................................52
6.3. Spare parts................................................................................................. 62

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1. Introduction
1.1. Overview of this manual
Keep the instructions near the device.
Read these instructions carefully before installing, adjusting or maintenance of the
device. Follow the given instructions.
Remember to ask the HVAC technician to fill in the installation record, which is
returned to heat pump manufacturer. The installation record is a prerequisite for the
manufacturer’s guarantee.
Warnings
Throughout this manual, the following warnings are used to point out information:
Be careful. The symbol indicates a possible danger of bodily
harm or lethal injury if instructions are not followed.
Pay attention. The symbol indicates a possible danger
of damage to the device, components or surroundings if
instructions are not followed.
Read this instruction. Note indicates important information.
1.2. Transportation and storage
Transport and store the heat pump in a vertical position.
Transport the heat pump to the installation site on its
transporting platform.

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Be careful when lifting the heat pump. Use appropriate lifting
tools.
The heat pump can be tilted to a maximum angle of 45 degrees
for short periods of time (1–2 minutes).
Always use a pallet truck when lifting the RE 55, RE 70, and RE 85 heat pumps. The
smaller models RE 35 and RE 42 you can also lift and move with a hand truck.
When using a hand truck, lift the heat pump only from the back or front of the device.
1.3. Delivery content, optional equipment, and accessories
Standard delivery content
Heat pump standard delivery includes the following:
● heat pump
● condenser circuit pump
● ground circuit pump
● outdoor temperature sensor
● space heating circuit temperature sensor
● 3 temperature sensors for buffer tank *)
● installation and operation manual, electrical drawings
● installation, commissioning and warranty records
● maintenance sheets.
*) By default, 2 temperature sensors have been configured as space heating buffer
tank temperature sensors, and 1 for domestic hot water buffer tank temperature
sensor. Settings can be changed in commissioning.
Optional equipment
In addition to the standard delivery content, the following optional equipment may be
separately ordered:
● buffer tanks
● desuperheater package, which includes heat exchanger, circulation pump, and
connection hose package for desuperheater model 1 ¼” 1000 mm (4 steel cord
hoses + gaskets)
● Modbus gateway
● remote control unit for monitoring device through LAN, Internet, and SMS
● remote control unit for monitoring device through LAN, Internet, smart phone
application, and ACS computer program
● wireless or wired control unit
● wireless or wired room temperature and outdoor temperature sensor
● signal amplifier for wireless devices

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● humidity sensors for cooling applications
● diverting valve
● connection hose package 2” 1000 mm (4 steel cord hoses + gaskets)
Accessories
When installing the heat pump, depending on the installation site, few additional
accessories and devices may be needed. Among other things, the following
accessories may be ordered separately:
● ground circuit diaphragm expansion tank
● ground circuit safety valve
● heating circuit diaphragm expansion tank
● heating circuit 3- or 4-way valves
● heating system expansion tank
● pump for heating circuits 1, 2 and 3
● mixing valve for domestic hot water
● heating system safety valve (1,5 bar)
● heating system pressure gauge (0–4 bar)
● ground circuit pressure gauge (0–4 bar)
● filters for ground circuit and heating circuit
● flexible connection hoses for brine and condenser circuits with seals
● pipes and pipe accessories.
1.4. Control system
The heat pump is equipped with an automatic control system which manages heating
and domestic hot water production. The control system includes the built-in automation
system, the sensors attached to it, and a control panel. The control panel is used for
monitoring and changing system settings. Also error notifications are browsed and
reset on the control panel.
An optional remote control unit can also be used for browsing and changing system
data and error notifications. It can also serve as a remote temperature sensor,
providing the control system with room temperature data.
The heat pump can be remotely controlled and monitored through Modbus gateway
and remote access modules.
The system settings have been organized into menus, similar to folders on a computer.
In addition, there are various user levels in the system. The visibility of menus or
menu items depends on the user level. To access user levels other than End user or
Commissioning, an access code is needed.

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1.5. Operating principle
A
B
C
RE15 ver. 2
1. Evaporator
2. Compressor
3. Condenser
4. Expansion valve
A. Brine circuit
B. Refrigerant circuit
C. Heating circuit
There are three closed circuits running within, or through, the heat pump:
● brine circuit
● refrigerant circuit
● heating circuit.
The heat pump's operation is based on the vaporisation and condensation of the
refrigerant circulating within the heat pump.
The brine circuit is a circuit for collecting heat energy from the ground. When the brine
enters to the circuit at the evaporator, it is very cold. As it travels along the circuit, it
collects heat energy from the ground or water, which causes the brine temperature
to rise. The brine completes its circuit by returning to the evaporator and releasing
the heat energy into the refrigerant, which circulates between the evaporator and the
condenser.
When the refrigerant is in the condenser, it is colder than the brine, so the heat
energy transfer from brine into refrigerant can take place. The heat transfer raises the
temperature of the refrigerant up to the point where it becomes gaseous.
The gaseous refrigerant is then led into a compressor, which compresses it into a
high pressure. As the pressure of the gaseous refrigerant increases, so does its
temperature.

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Next, the high-pressure gaseous refrigerant is led into the condenser, where it releases
its heat energy into the water that circulates between the heat pump and the buffer
tank. As the refrigerant releases its heat energy and its temperature drops, it becomes
liquid again.
The liquid refrigerant is then led into an expansion valve, where the pressure and
temperature are lowered further. The refrigerant completes its circuit by returning back
to the evaporator, where it receives heat energy from the brine circuit.
The heat pump can also be used as a water chiller.
1.6. Main features
The following figure represents a principle of the RE heat pump connections. For more
detailed instruction about connections, see section Piping diagrams.
RE16 ver. 1
1. Evaporator
2. Compressor
3. Condenser
4. Expansion valve
5. Desuperheater (option)
A. Brine circuit
B. Refrigerant circuit
C. Condenser circuit
D. Desuperheater circuit
E. Domestic hot water
F. Heating circuit out
G. Domestic cold water
H. Heating circuit in
The RE heat pump is always connected to a separate buffer tank or buffer tanks.
Domestic hot water is warmed up in hot water loops inside buffer tank. Preheating loop
can be located in the middle of the same buffer tank or in another buffer tank. Rest of
the heating is carried out by loop in the upper part of the buffer tank or loop in separate
domestic hot water buffer tank.
For all RE heat pumps, the desuperheater functionality can be ordered as an option.

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When using the heat pump as a water chiller (clean water circulates in the evaporator
instead of frost-proof solution), the evaporator must be protected from freezing. Usage
of flow switch on the evaporator side is highly recommended.
When maintaining the heat pump, note that adding and purging of a liquid refrigerant
from the evaporator with standing water can cause a frost damage.
1.7. Heat pump system dimensioning
Ground source heat pump can be sized to operate at
● partial capacity
● full capacity.
With partial capacity heat pump maximum capacity is sized up to correspond 60 – 80%
of a building’s maximum heating demand. In this case the heat pump produces the
most part of the building’s annual heat energy demand.
With partial capacity, heat pump operating periods are long during heating season.
This reduces the number of compressor stops and start-ups. During hardest freezing
periods at winter additional capacity from heat pump can be obtained with in-built
electric heater or oil boiler.
With full capacity, heat pump is sized up according to a building’s maximum capacity
demand, practically slightly over sized. With full capacity, the use of additional heating
capacity is minimised, thus in electric heaters’ case it is possible to use smaller fuse
size in electrical connection.
1.8. Collecting heat
Oilon RE heat pump’s heat source is usually a drilled well. The number and depth of
wells depend on heating demand. Soil or water can also be used as heat source. When
using water the piping is anchored to the bottom.
During heating period, the ground circuit fluid warms up a few degrees during
circulation. Collected heat is used to vaporise refrigerant in heat pump unit. Horizontal
piping requires applicable soil type and sufficient land area for piping. Applicable soil
types are fine grained and moist, such as clay or silt. Drilled well is suitable for all
locations except places where solid rock goes deep underground. When piping is
installed into water, building should be located sufficiently close to shoreline, preferably
less than 50 m away. Water should also be sufficiently deep, over 2 m right from shore.
In addition, waste heat from industrial processes can be used as heat source for the
heat pump.