CTC Union EcoPart XL 434 Manual

Providing sustainable energy solutions worldwide
162 105 18-3 2013-10-10
Installation and Maintenance Manual
CTC EcoPart XL
Model 424-434

1. Disconnect the cooling module’s power cable con-
nector and hoses.
2. Attach the two carrying handles to the bottom of the
cooling module.
3. Unscrew the cooling module’s screws. 4. Pull the cooling module by first lifting the front edge
slightly with the carrying handles.
5. Lift the cooling module using the carrying handles and
shoulder straps.
6. Lift the cooling module into the product using the
carrying handles and shoulder straps. Remove the
carrying handles and reconnect the power cable,
hoses and screws.
Removing the cooling module

Installation and Maintenance Manual
CTC EcoPart XL
Model 424-434
162 105 18-3 2013-10-10

4CTC EcoPart XL
General
Your own reminder
Fill in the information below. It may come in useful if anything should happen.
Product: Serial number:
Pipe installation carried out by: Name:
Date: Tel. no.:
Electrical installation carried out by: Name:
Date: Tel. no.:
Enertech AB is not liable for any misprints and reserves the right to make changes.
Table of Contents
Check list ____________________________________________________________________ 6
Don't forget!________________________________________________________________ 7
Safety precautions _____________________________________________________ 7
1. Technical data______________________________________________________ 8
1.1 Table 400 V 3N ~ ____________________________________________ 8
1.2 Component locations _______________________________________ 9
1.3 Dimensional drawing
_____________________________________ 10
1.4 Refrigerant system _________________________________________ 11
1.5 Operating range ____________________________________________ 11
2. Operation and maintenance______________________________ 12
2.1 Periodic maintenance _____________________________________ 12
2.2 Operational stoppages ___________________________________ 12
2.3 Service mode________________________________________________ 12
3. Troubleshooting/appropriate action _________________ 12
3.1 Air problems _________________________________________________ 12
3.2 Alarms _________________________________________________________ 12
4. Installation__________________________________________________________ 13
4.1 Connection___________________________________________________ 14
4.1.1 Heating medium side __________________________________ 14
4.1.2 Charge pumps___________________________________________ 15
4.1.3 Control/power supply__________________________________ 16
4.2 Connecting the brine system ___________________________ 17
4.2.1 Pump curves, brine ____________________________________ 21
5. Electrical installation _________________________________________ 22
5.1 Series connection of heat pumps _____________________ 23
5.1.1 Shielded communication _____________________________ 23
5.1.2 Terminated position ____________________________________ 23
5.2 Alarm output_________________________________________________ 24
5.3 CTC Basic Display _________________________________________ 24
5.4 Wiring diagram 400 V 3N ~ _____________________________ 25
6. Connecting the control system_________________________ 26
6.1 General ________________________________________________________ 26
6.2 Connection option 1 – Standalone____________________ 26
6.3 Connection option 2 –
CTC EcoLogic Pro _________________________________________ 27
6.4 Connection option 3 –
CTC EcoZenith I 550______________________________________ 28
7. First start ___________________________________________________________ 29
Declaration of conformity ________________________________________ 30

5CTC EcoPart XL
General
Congratulations on your new purchase!
The complete heat pump for bedrock,
ground or lake heat sources
The CTC EcoPart XL is a heat pump that takes heat from bedrock, ground or lake
heat sources and supplies it to the existing heating system in the house.
The heat pump can be connected to a CTCEcoZenith or to the existing boiler
via the CTCEcoLogic control system; doing this allows the CTC EcoPart XL to
be fully utilised before the regular heating system is switched on to help heat the
house.
The CTC EcoPart XL is designed to operate with high efficiency and a low noise
level.
Keep this manual containing the installation and maintenance instructions. If you
look after it properly, you will be able to enjoy using your CTC EcoPart XL for
many years. This manual provides all the information you will need.
The CTC EcoPart XL is available in three different versions:
CTC EcoPart XL
Standard brine pumps
No charge pumps
CTC EcoPart XL LEP (low energy pump)
Low energy brine pumps
No factory-fitted charge pumps
CTC EcoPart XL 4xLEP (low energy pump)
Low energy brine pumps
Low energy charge pumps

6CTC EcoPart XL
General
Check list
The check list must always be completed by the installer
• If a service is needed, you may be required to provide this document
• The installation must always follow the instructions provided in the installation and maintenance
manual
• The installation shall be carried out in accordance with all current and relevant building, water and
electrical standards and accredited organizations recommendations
After installation, the system must be inspected and functional checks performed as indicated
below:
Pipe installation
The heat pump is filled, positioned and adjusted in the correct manner according to the instructions
The heat pump is positioned so that it can be serviced
Capacity of the charge/radiator pump (depending on system type) for the flow required
Open radiator valves (depending on system type) and other relevant valves
Tightness test
The system has been bled
Check the requisite safety valves operate properly
Requisite waste pipes connected to floor drain (depending on system type)
Electrical installation
Power switch
Cable connections are tight
Requisite sensors fitted
Accessories
Customer information (adapted to the installation in question)
Start-up done with customer/installer
Menus/control for selected system
Installation and maintenance manual supplied to customer
Check and filling, heating system
Information on fine adjustments
Alarm information
Functional test of safety valves fitted
Warranty and insurance
Information on how to report a fault
______________________________________ ______________________________________
Date / Customer Date / Installer

7CTC EcoPart XL
General
Don't forget!
Double check the following points at the time of delivery and installation:
• The product must be transported and stored upright.
• Remove the packaging and check before installation that the product
has not been damaged in transit. Report any transport damage to the
carrier.
• Place the product on a firm surface, preferably made of concrete.
If the product will be standing on a soft carpet, soft pads must be
placed under the adjustable feet.
• Remember to leave a service area of at least 1 metre in front of the
product.
• The product must not be placed below floor level either.
• Avoid placing the product in rooms with thin walls, as people in the
adjoining room may be disturbed by the compressor and vibrations.
• Ensure that the dimensions of pipes used between the heat pump and
the heating system are adequate.
• Ensure that the circulating pump that pumps water to the heat pump
has sufficient capacity.
Safety precautions
The following safety precautions must be observed when handling, installing
and using the product:
• Turn off the safety (power) switch before doing any work on the
product.
• The product should not be flushed with water.
• When handling the product with a lifting eye or similar device, ensure
that the lifting equipment, eyebolts and other parts are not damaged.
Never stand under the hoisted product.
• Never jeopardise safety by removing bolted covers, hoods or other
parts.
• Never jeopardise safety by deactivating safety equipment.
• Any work on the product's cooling system may only be performed by a
qualified professional.
• This product is intended exclusively for indoor installation.
!If these instructions are not followed during installation, operation and
maintenance, Enertech's obligation under the applicable warranty terms is not
binding.

8CTC EcoPart XL
General
1. Technical data
1.1 Table 400 V 3N ~
EcoPart 424 EcoPart 434
kW 10.1 14.8
A 18.2 23.0
IPX1
EcoPart 424 EcoPart 434
kg 2 x 2.5 2 x 2.9
MPa 3.1 (31 bar)
kg 315 332
mm 596 x 1424 x 670
EcoPart 424 EcoPart 434
l 4.07 x 2
°C -5/20
bar 0.2/3.0
l/s 2 x 0.44 2 x 0.63
l/s 2 x 0.73 2 x 1.05
2 x 6.4 (17 kPa) 2 x 7.7 (24 kPa)
TOP-S 25/10
3
Stratos Para 25/12
EcoPart 424 EcoPart 434
°C 110
l/s 2 x 0.28 2 x 0.40
2 x 5.5 (3.5 kPa) 2 x 5.9 (6 kPa)
l/s 2 x 0.56 2 x 0.81
EcoPart 424 EcoPart 434
@ -5/45 kW 2 x 9.88 2 x 14.05
COP 1) @ -5/45 - 3.24 3.19
@ 0/35 | 0/45
0/55
kW 2 x 11.75 | 2 x 11.24
2 x 10.97
2 x 16.76 | 2 x 16.14
2 x 15.87
COP 1) @ 0/35 | 0/45
0/55
- 4.54 | 3.64
2.95
4.55 | 3.61
3.07
@ 5/35 | 5/45
5/55
kW 2 x 13.53 | 2 x 12.95
2 x 12.57
2 x 19.25 | 2 x 18.42
2 x 18.16
COP 1) @ 5/35 | 5/45
5/55
- 5.13 | 4.11
3.28
5.02 | 4.05
3.38
A 18.3 23.0
dB(A) 53 57
Electrical data
Rated power
Rated current
IP class
Other data
Refrigerant quantity (R407C)
Interrupt value switch HP
Weight
Width x Height x Depth
Brine system
Water volume (V)
Brine system min./max. temp. (TS)
Brine system min./max. pressure (PS)
Brine system min. flow, Δt = 5 K
Brine system nominal flow, Δt = 3 K
Kvs value Δt = 3 K, at nominal flow
Brine system pump, standard
Brine system pump speed adjustment
Brine system pump LEP*
Brine system pump LEP*speed adjust to Δt = 2-4 K
Pump capacity see diagram in the Pipe installation chapter
*Low Energy Pump
Heating system
Max temperature heating medium (TS)
Heating medium system min flow 2)
Kvs value Δt = 10 K, at min flow
Heating medium system nominal flow 3)
2) At Δt = 10 K and 0/35 °C heat pump operation.
3) At Δt = 5 K and 0/35 °C heat pump operation.
Operational data for heat pump
Output from compressor 1)
Output from compressor 1)
Output from compressor 1)
Max. operating current Compressor
Sound effect according to EN 12102
1) EN14511:2007, inclusive:
Heating medium pump (EP406/408 - Stratos Tec 25/6 and EP410/412 - Stratos Tec 25/7)
Brine system pump (EP406/410 - Wilo Stratos Para 25/8 and EP412 - Wilo Stratos Para 25/12)

9CTC EcoPart XL
General
1. Compressor
2. Evaporator
3. Condenser
4. Drying filter
5. Expansion valve
6. High pressure switch
7. Terminal block
8. High pressure sensor
9. Low pressure sensor
10. Drain valve cold side/Brine
11. Drain valve hot side/Water
12. Adapter for pump installation*
13. Circulation pump cold side
14. Adjustable feet
15. Conduit for communication cable
16. Conduit for mains power cable
17. Brine in Ø28 mm (from bedrock)
18. Brine out Ø28 mm (to bedrock)
19. Heat medium out Ø28 (from HP)
20. Heat medium in Ø28 (to HP)
21. Hot gas sensor
22. Brine sensor in
23. Brine sensor out
24. Condenser sensor in
25. Condenser sensor out
26. Service outlets
27. CTC Basic Display for CM 2
28. CTC Basic Display for CM 1 (accessory)
29. Cooling module 2
30. Cooling module 1
* The picture shows a CTC EcoPart XL
without heating medium pumps.
1
7
16
6
21
8
24
29
30
14
22
325 21528 27
4
5
9
23
13
17
17
18
18
19
19
20
20
10
11
1.2 Component locations
12
26

10 CTC EcoPart XL
General
1.3 Dimensional drawing




 

 


 



11CTC EcoPart XL
General
13 24
5
8
6
7
91011
12 13
1514
16
17
1. Brine (heat source)
2. Water
3. Evaporator
4. Condenser
5. Compressor
6. Expansion valve (electronic)
7. Drying filter
8. Refrigerant exchanger
9. Low pressure sensor
10. High pressure sensor
11. High pressure switch
12. T suction gas
13. T hot gas
14. T brine
15. T water out
16. T water in
17. Expansion valve control
1.4 Refrigerant system
1.5 Operating range
The operating range of the heat pump is defined by the test standard EN 14511
and is given by the flow and return temperatures. The CTC EcoPart monitors
the operating range continuously through pressure sensors. In many cases, the
CTC EcoPart can achieve a higher flow temperature than that indicated by the
operating range.
Operating range (flow/return in °C) according to EN 14511
-5/25
-5/61
+20/25
+20/59

12 CTC EcoPart XL
General
2. Operation and maintenance
3. Troubleshooting/appropriate action
The CTC EcoPart XL is designed to provide reliable operation and a high level
of comfort, as well as having a long service life. Here are some tips that may be
helpful and guide you in the event of an operational malfunction.
If a fault occurs, you should always contact the installer who carried out the
installation. If the installer believes the malfunction is due to a material or design
fault, then they will contact Enertech AB to check and rectify the fault. Always
quote the product's serial number.
3.1 Air problems
If you hear a rasping sound from the heat pump, check that it has been bled
properly. Top up with water if necessary, so that the correct pressure is achieved.
If this noise happens again, get a professional to investigate the cause.
3.2 Alarms
Any alarms and information texts from the CTC EcoPart XL are displayed on the
product used to control it or on the CTC Basic Display; for this reason you should
consult the appropriate manual for alarm codes.
When the installer has installed your new heat pump, you should check together
with the installer that the system is in perfect operating condition. Let the installer
show you where the power switch, controls and fuses are so that you know
how the system works and how it should be maintained. Bleed the radiators
(depending on system type) after about three days of operation and top up with
water if necessary.
2.1 Periodic maintenance
After three weeks of operation, then every three months in the first year. Then
once a year:
• Check that the installation is free of leaks.
• Check that the product and the system are free of air; bleed if necessary, see
the section Connecting the brine system.
• Check that the brine system is still pressurised and the fluid level in the brine
vessel is adequate/correct.
2.2 Operational stoppages
The heat pump is turned off with the power switch. If there is a risk of the water
freezing, drain out all the water from the CTC EcoPart XL.
2.3 Service mode

13CTC EcoPart XL
General
4. Installation
This chapter is aimed at anyone responsible for one or more of the
installations required to ensure that the product works in the way the
property owner would like.
Take your time going through the functions and settings with the property
owner and answer any questions they may have. Both you and the pump
benefit from a user who fully understands how the system operates and
should be maintained.
The installation shall be carried out in accordance with current standards
within the relevant country, see building, water and electrical, regulations
and governing bodies for the installation of renewable technologies within
your region. The product must be connected to an expansion vessel in
an open or closed system. Do not forget to flush the radiator systems
clean before connection. Apply all the installation settings based on the
description in the chapter called First start.
The heat pump operates with a flow/return temperature across the
condenser of up to 65/58°C.
Transportation
Transport the product to the installation site before removing the packaging.
Handle the product using one of the following methods:
• Forklift truck
• Lifting straps around the pallet. Note: Can only be used with the
packaging on.
Removal of packaging
Take off the packaging when the heat pump is next to its installation site.
Check that the product has not been damaged in transit. Report any
transport damage to the carrier. Also check that the delivery is complete
according to the list below.
Scope of delivery:
• 1 x CTC EcoPart XL heat pump
• 1 x safety valve (½" 3 bar)
• 4 x check valves (1¼")
• 4 x dirt filters (1¼")
• 4 x rubber grommets (D=60)
• 4 x edge mouldings (186 mm)
• Additional cable for CTC Basic Display (cooling module 1)
!The product must
be stored and
transported upright.

14 CTC EcoPart XL
General
!It is very important that
the branch pipes are
exactly the same length
when they go into the
collection pipe.
!When the lower cooling
module is connected on
the side, the rim must
be insulated with the
rubber strip to prevent
it rubbing against the
hose.
Dirt filter
Control valve
Check valve
Shut-off valve
4.1 Connection
Connection can be on the right, left, top and rear of the heat pump. Cut
away the cover plate on the side where the hoses are to be connected.
When a hole has been made in the side plate, carry out the installation as
follows:
1. Place the protective edging provided around the edge of the hole in the
insulation plate in order to protect the hoses. If necessary, adjust the
length of the edging so that it fits in the hole.
2. Pass the hoses through the hole in the side cover plate and connect
them. Ensure that the insulation covers all parts of the brine connection
to prevent ice and condensation forming.
3. Then install the collector system.
It is also possible to connect the flow on one side and the return on the
other. See Measurement information for measurements and dimensions. The
dimension of the pipe between the heat pump and brine loop must not be
less than Ø35 mm.
Branch pipe
minimum Ø35 mm
Connection point Ø28 mm
Collection pipe
flow
Collection pipe
return
Heat pump 1
Heat pump 2
Flow heating medium side
Flow heating medium side
Return heating medium side
Return heating medium side
19
19
20
20
4.1.1 Heating medium side
The heat pump is connected with at least Ø35 mm and can then be taken
into a collection pipe. The check valve and dirt filter are 1¼". The collection
pipe is dimensioned according to the installation in question.
Route the pipes so that there is no other highest point where air can
accumulate and prevent circulation. If this is unavoidable, provide this
highest point with an automatic bleeder.

15CTC EcoPart XL
General
Wilo Stratos Tec 25/7
(Only CTC EcoPart 424 4xLEP)
Grundfos UPM GEO 25-85
(Only CTC EcoPart 434 4xLEP)
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 Q [m³/h]
0
1
2
3
4
5
6
7
8
9
[m]
H
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
[ft]
H
0 2 4 6 8 10 12 14 16 18 Q [US GPM]
UPM2 / UPM Geo
UPM Geo 25-85
XX-75
XX-70
XX-60
XX-50
XX-40
0 0,5 1,0 1,5 2,0 2,5 3,0 3,5
0
1
2
3
4
5
6
0
10
20
30
40
50
60
max.
Q/m³/h
p/kPa
H/m Wilo-Stratos TEC RS
15/7, 20/7, 25/7
1~230 V - Rp 1
n=1/min/ % PWM 1
4450/ ≤ 5PWM1
3880/19PWM1
3480/29PWM1
3120/38PWM1
1200/85PWM1
min.
4.1.2 Charge pumps
The CTC EcoPart XL is available in three different versions:
• CTC EcoPart XL
Standard brine pumps
No charge pumps
• CTC EcoPart XL LEP (low energy pump)
Low energy brine pumps
No factory-fitted charge pumps
• CTC EcoPart XL 4xLEP (low energy pump)
Low energy brine pumps
Low energy charge pumps
The selection of charge pump depends on the type of system. To ensure proper
operation, the flows in the heating medium circuit should not be lower than the
values in the table under Technical data. Ensure that the circulating pump fitted
is large enough, so that there is sufficient flow through the heat pump. If the flow
is too low, there is a risk that the high pressure switch will be triggered.
The charge pump can be connected either to the CTC EcoPart XL (provided it
is installed internally) or to the product used to control it. For internal installation
one of the following is normally selected:
CTC EcoPart 424 Stratos Tec 25/7 CTC item no.: 58 50 33 301
CTC EcoPart 434 Grundfos UPM GEO 25-85 CTC item no.: 58 59 33 301

16 CTC EcoPart XL
General
4.1.3 Control/power supply
CTC EcoLogic Pro
Up to 10 heat pumps can be connected to a CTC EcoLogic Pro, i.e. five
EcoPart XL units. The charge pumps in heat pumps 1 and 2 can then be
connected to the CTC EcoLogic Pro. A charge pump for heat pumps 3–10
must be installed and connected to the CTCEcoPart XL.
CTC EcoZenith v3
The PWM pump is connected to the CTC EcoPart XL and controlled by the
heat pump. If a 0–10 V pump from CTC or a non-speed-controlled pump is
used, see the manual for a CTC EcoZenith.
Standalone mode
The charge pump is connected to the CTC EcoPart XL and controlled using
the CTC Basic Display.

17CTC EcoPart XL
General
4.2 Connecting the brine system
The installation and connection of the brine system, i.e. collector to bedrock
or ground, shall be carried out by a qualified professional in accordance with
current regulations.
Take all precautions to ensure that no debris gets into the collector hoses,
which must be flushed clean before being connected. Always leave the
cover plugs in place during any work.
The temperature of the brine system can fall below 0°C. This is why it is
important not to use water-based lubricants etc. during installation. It is also
important for all parts to be insulated against condensation to prevent ice
forming.
!We recommend
that you follow
the installation
instructions from
the local heat pump
association.
!It is very important that
the branch pipes are
exactly the same length
when they go into the
collection pipe.
Dirt filter
Control valve
Check valve
Shut-off valve
Branch pipe
minimum Ø35 mm
Connection point
Ø28 mm
Collection pipe
brine out
Collection pipe
return
Brine out
Brine out
Return brine
Return brine
18
18
17
17
Heat pump 1
Heat pump 2
Exp.
vessel

18 CTC EcoPart XL
General
105
103
104
98d
100
101
102
99
97
96
98c
98a
cTc
98b
96 Level/expansion vessel
97 Filling kit
98 Shut-off valve
99 CTC filter
100 3-way valve
101 External filling pump
102 Mixing vessel
103 Brine/refrigerant pump
104 Evaporator
105 3 bar safety valve
Schematic diagram, filling
The filling equipment is represented by the parts drawn with dashed lines.
Note: It must be possible to bleed the collector pipes wherever air pockets
can form. Always check the filter (99) when filling and bleeding the brine
system.
!The mixing vessel
and pump should be
a good size.
Valves
To make it easier to service the cooling unit, shut-off valves must be fitted to
both the incoming and outgoing connections. Fit bifurcated valves so that
you can fill and bleed the collector loop later on.
Bleeding
The collector loop should not contain any air. Even very small amounts
of residual air can jeopardise the heat pump's operation. See Filling and
bleeding below.
Insulation against condensation
All pipes in the brine system must be insulated against condensation,
otherwise heavy ice and condensation may form.

19CTC EcoPart XL
General
Topping up and bleeding
Mix water and antifreeze solution in an open vessel. Connect the hoses
to the shut-off valves (98a and 98b) as shown in the diagram. Connect a
powerful external pump (101) for filling and bleeding. Then reset the three-
way valve (100) and open the valves (98a and 98b) so that the brine passes
through the mixing vessel (102). Also make sure that the valve (98d) is open.
For brine pump start-up, see the relevant manual for the EcoPart control
system.
Allow the brine to circulate in the system for a long period of time until it is
completely free of air. There may still be pockets of air even if no air comes
out with the fluid. Reset the three-way valve (100) so that any remaining air
can come out.
Bleed the level vessel (96) by loosening the plug at the top of the level vessel.
Now close the valve (98a) while the filling pump is still running. The filling
pump (101) now pressurises the system. Also close the valve (98b) and turn
off the filling pump.
If the level in the level vessel is too low, close the valves (98c and 98d).
Unscrew the plug and fill the vessel to about 2/3 full. Screw the plug back in
and open the valves (98c and 98d).
Checking the brine system after installation
After a few days, you should check the fluid level in the vessel. Top up if
necessary and then close the valves (98c and 98d) when filling.
Expansion vessel
The vessel should be fitted to the incoming pipe from the bedrock or ground
source, at the system's highest point. Remember that the vessel can
produce condensate. Fit the safety valve (105) as shown in the schematic
diagram and fit a suitable plug to the top of the vessel.
If the vessel cannot be fitted at the highest point, a closed expansion vessel
must be fitted.
Filling kit with dirt filter
Arrows on the valve housing indicate the direction of flow. When cleaning
the filter, close the valves (98c and 100). Unscrew the filter cap and flush the
filter clean. When refitting, the pin under the filter holder should be pushed
into the designated hole in the filter housing. Top up with a little brine, if
necessary, before fitting the cap.
After a short period of operation, the filter should be checked and cleaned.
Brine
The brine circulates in a closed system. The fluid consists of water and
antifreeze solution. Ethanol is recommended, e.g. Svedol or Brineol. The
alcohol is mixed to a concentration slightly lower than 30%, which is
equivalent to fire risk class 2b and a freezing point of approx. -15°C.
You should allow for approx. 1 litre of ready-mixed brine per meter of
collector hose, i.e. approx. 0.3 litres of antifreeze solution will be needed per
metre of hose, for a hose diameter of 40 mm.
!Check the dirt filter
once bleeding is
complete.
!The fluid must be
mixed thoroughly
before the heat
pump is started.

20 CTC EcoPart XL
General
Air pockets
To avoid air pockets, make sure that the collector hoses constantly rise
towards the heat pump. If this cannot be done, it must be possible to bleed
the system at the high points. The filling pump usually manages smaller local
height discrepancies.
Checking brine difference
When the heat pump is running, regularly check that the temperature
difference between the incoming and outgoing brine temperature is not too
high. If the difference is quite high, one of the reasons for this may be air in
the system or a blocked filter. If this is the case, the heat pump triggers the
alarm for this.
The factory setting for the alarm is 7 °C, but 9 °C is permitted for the first
72hours that the compressor is in operation, as microbubbles in the system
can reduce brine flow.
Brine pump, standard
The brine pump has three speeds. A different speed can be set depending
on the length of the brine hose being used. With ground source heat, for
example, the hose is longer than for geothermal (bedrock) heat, which can
therefore mean a greater need for a higher speed. The speed of the brine
pump is set so that the difference in temperature between brine in and brine
out is approx.: 3 °C.
Brine pump – low energy pump (LEP)
The brine pump can be set to two different control settings: pressure-
regulated speed or constant speed. Since the brine system has a fixed
pressure drop, constant speed must be set. See the diagram showing
setting of the brine pump. The pump setting is affected by the pressure
drop in the circuit. For this reason, the setting should be reviewed at each
installation. In general, constant operating pressure (option 2) must be
selected. Try different settings to find one that is suitable.
To attain good system performance, the pump must be adjusted. Try to
achieve a temperature difference of approx. 2–4 K.
Set the red button to setup option 2. Adjust so that the correct temperature
difference is obtained.