EHPT20X-VM2HA SM1

CYLINDER UNIT
July 2011
No. OCH507
SERVICE MANUAL
R410A
[Model name]
[Service Ref.]
EHST20C-VM6HA
EHST20C-VM6HA.UK
EHST20C-YM9HA.UK
EHST20C-VM6A.UK
EHST20C-YM9A.UK
EHST20C-VM6SA.UK
EHPT20X-VM2HA.UK
EHPT20X-VM6HA.UK
EHPT20X-YM9HA.UK
EHPT20X-VM6A.UK
EHPT20X-YM9A.UK
EHST20C-YM9HA
EHST20C-VM6A
EHST20C-YM9A
EHST20C-VM6SA
EHPT20X-VM2HA
EHPT20X-VM6HA
EHPT20X-YM9HA
EHPT20X-VM6A
EHPT20X-YM9A
Note:
• This manual describes only
service data of cylinder unit.
• RoHS compliant products have
<G> mark on the spec name
plate.
CONTENTS
1. REFERENCE MANUAL. .................................. 2
2. SAFETY PRECAUTION................................... 3
3. SPECIFICATIONS. ........................................... 7
4. PART NAMES AND FUNCTIONS ................... 8
5. OUTLINES AND DIMENSIONS. .................... 10
6. WIRING DIAGRAM.......................................... 11
7. FIELD WIRING. .............................................. 21
8. WATER SYSTEM DIAGRAM. ........................ 25
9. CONTROLS.................................................... 28
10. TROUBLESHOOTING. .................................. 43
11. DISASSEMBLY PROCEDURE....................... 56
12. SUPPLEMENTARY INFORMATION.............. 72
CYLINDER UNIT
MAIN CONTROLLER
13. SERVICE AND MAINTENANCE.................... 73
PARTS CATALOG (OCB507)
1
REFERENCE MANUAL
OUTDOOR UNIT'S SERVICE MANUAL
Service Ref.
Service Manual No.
PUHZ-RP35/50/60/71VHA4
PUHZ-RP100/125/140VKA
OCH451
PUHZ-RP100/125/140YKA
PUHZ-HRP71/100VHA
PUHZ-HRP71/100VHA2
PUHZ-HRP71/100VHA2R1
PUHZ-HRP100VHA2R2
OCH425
PUHZ-HRP100/125YHA
PUHZ-HRP100/125YHA2
PUHZ-HRP100/125YHA2R1
PUHZ-W50/85VHA
PUHZ-W50/85VHA-BS
PUHZ-W85VHAR1
OCH439
PUHZ-W85VHAR1-BS
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK
OCH465
PUHZ-HW112/140YHA
PUHZ-HW112/140YHA-BS
PUHZ-HW112/140YHA2
PUHZ-HW112/140YHA2-BS
PUHZ-HW140VHA
OCH439
PUHZ-HW140VHA-BS
PUHZ-HW140VHA2
PUHZ-HW140VHA2-BS
PUHZ-HW140VHA2R1-BS
2
SAFETY PRECAUTION
Please read the following safety precautions carefully.
WARNING:
Precautions that must be observed to prevent injuries or death.
CAUTION:
Precautions that must be observed to prevent damage to unit.
This installation manual along with the user manual should be left with the product after installation for future reference.
Mitsubishi Electric is not responsible for the failure of locally or field-supplied parts.
• Be sure to perform periodical maintenance.
• Be sure to follow your local regulations.
• Be sure to follow the instructions provided in this manual.
WARNING
Mechanical
The cylinder unit and outdoor units must not be installed, disassembled, relocated, altered or repaired by the user. Ask an authorised installer or technician. If
the unit is installed improperly or modified after installation by the user, water leakage, electric shock or fire may result.
The outdoor unit should be securely fixed to a hard level surface capable of bearing its weight.
The cylinder unit should be positioned on a hard vertical surface capable of supporting its filled weight to prevent excessive sound or vibration.
Do not position furniture or electrical appliances below the outdoor unit or cylinder unit.
The discharge pipework from the emergency/safety devices of the cylinder unit should be installed according to local law.
Only use accessories and replacement parts authorised by Mitsubishi Electric and employ a qualified technician to fit the parts.
Electrical
All electrical work should be performed by a qualified technician according to local regulations and the instructions given in this manual.
The units must be powered by a dedicated power supply and the correct voltage and circuit breakers must be used.
Wiring should be in accordance with national wiring regulations. Connections must be made securely and without tension on the terminals.
Earth unit correctly.
General
Keep children and pets away from both the cylinder unit and outdoor units.
Do not use the hot water produced by the heat pump directly for drinking or cooking. This could cause illness to the user.
Do not stand on the units.
Do not touch switches with wet hands.
Annual maintenance checks on both the cylinder unit and the outdoor unit should be done by qualified person.
Do not place items containing liquid in on top of the cylinder unit. If they leak or spill onto the cylinder unit, damage to the unit and/or fire could occur.
Do not place any heavy items on top of the cylinder unit.
When installing or relocating, or servicing the cylinder unit, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other
refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant
line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
CAUTION
Use clean water that meets local quality standards on the primary circuit.
The outdoor unit should be installed in an area with sufficient airflow according to the diagrams in the outdoor unit installation manual.
The cylinder unit should be located inside to minimise heat loss.
Water pipe-runs on the primary circuit between outdoor and indoor unit should be kept to a minimum to reduce heat loss.
Ensure condensate from outdoor unit is piped away from the base to avoid puddles of water.
Remove as much air as possible from water circuit.
Refrigerant leakage may cause suffocation. Provide ventilation in accordance with EN378-1.
Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.
Never put batteries in your mouth for any reason to avoid accidental ingestion.
Battery ingestion may cause choking and/or poisoning.
Install the unit on a rigid structure to prevent excessive sound or vibration during operation.
If power to the cylinder unit is to be turned off (or system switched off) for a long time, the water should be drained.
Preventative measures should be taken against water hammer, such as installing a Water Hammer Arrestor on the primary water circuit, as directed by the manufacturer.
WARNING (SPLIT MODELS ONLY)
Do not discharge refrigerant into the atmosphere. If refrigerant leaks during installation, ventilate the room.
Use appropriate tools for high pressure refrigerant.
When pumping down refrigerant , stop the compressor before disconnecting the refrigerant pipes.
During installation securely fasten the refrigerant pipes before starting the compressor.
Check that refrigerant gas does not leak after the completion of installation.
Use R410A refrigerant only. Do not allow air to enter the lines. Failure to observe these instructions will cause mechanical failure, system failure or, in the worst
case, serious breach of product safety.
CAUTION (SPLIT MODELS ONLY)
<Using R410A refrigerant heat pumps>
Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and
do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specified thickness. Note the following if reusing existing pipes that carried R22 refrigerant.
- Replace the existing flare nuts and flare the flared sections again.
- Do not use thin pipes.
Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing. (Leave elbow joints, etc. in their packaging.) If dust, debris, or moisture enters the refrigerant lines, oil deterioration or compressor breakdown may result.
Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections. If mineral oil is mixed in the refrigeration oil, oil deterioration may result.
Do not use refrigerant other than R410A refrigerant. If another refrigerant is used, the chlorine will cause the oil to deteriorate.
Use the following tools specifically designed for use with R410A refrigerant. The following tools are necessary to use R410A refrigerant. Contact your nearest
dealer for any questions.
Tools (for R410A)
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Flare tool
Size adjustment gauge
Vacuum pump adapter
Electronic refrigerant charging scale
Be sure to use the correct tools. If dust, debris, or moisture enters the refrigerant lines, refrigeration oil deterioration may result.
Do not use a charging cylinder. If a charging cylinder is used, the composition of the refrigerant will change and system efficiency will be reduced.
CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Use new refrigerant pipes.
If using the existing R22, be careful of the followings.
· For RP100, 125 and 140, be sure to perform replacement
operation before test run.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
Contamination inside refrigerant piping can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Tools for R410A
Flare tool
Size adjustment gauge
Vacuum pump adaptor
Electronic refrigerant
charging scale
Handle tools with care.
Store the piping to be used indoors during
installation, and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
If dirt, dust or moisture enters into refrigerant cycle, it can
cause deterioration of refrigerant oil or malfunction of compressor.
Do not use a charging cylinder.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amounts of mineral oil enters, it can cause deterioration of refrigerant oil etc.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use the specified refrigerant only.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Only use R410A refrigerant.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Unit
Gravimeter
[3] Service tools
Use the service tools below as exclusive tools for R410A refrigerant.
No.
Tool name
1
Specifications
· Only for R410A
Gauge manifold
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2
Charge hose
· Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3
Electronic scale
4
Gas leak detector
· Use the detector for R134a, R407C or R410A
5
Adaptor for reverse flow check
· Attach on vacuum pump.
6
Refrigerant charge base
7
8
Refrigerant cylinder
—
—
· Only for R410A
·Top of cylinder (Pink)
· Cylinder with syphon
Refrigerant recovery equipment
—
DHW tank
Booster heater
Water circuit
(Primary)
Optional extras
• Wireless Remote Controller
• Wireless Receiver
• Immersion heater (1 Ph 3kW)
• EHPT Accessories for UK
Solar (ancillary) connection
Electrical data
Tank performance *2
Operating ambient condition
Connections
Primary circuit circulating Pump
Safety device
Unvented expansion vessel
(Primary heating)
Plate heat exchanger
Heating
1.0 MPa
(10 bar)
1.0 MPa
(10 bar)
119 kg
90°C/
0.7 MPa
(7 bar)
9.52 mm
3~, 400 V,
50 Hz
15.88 mm
9.52 mm
~/N, 230 V,
50 Hz
15.88 mm
9.52 mm
3~, 400 V,
50 Hz
15.88 mm
9.52 mm
32 A
Breaker
PAR-WT40R-E
PAR-WR41R-E
PAC-IH03V-E
PAC-WK01UK-E
13 A
16 A
Current
Breaker
PAC-SE41TS-E
PAC-SH50RJ-E
PAC-SH30RJ-E
3 kW
Capacity
• Remote sensor
• Joint pipe (15.88 → 12.7)
• Joint pipe (9.52 → 6.35)
16 A
13 A
~/N, 230 V, 50 Hz
26 A
32 A
26 A
—
—
—
—
16 A
13 A
32 A
26 A
2 kW+4 kW 3 kW+6 kW 2 kW+4 kW 3 kW+6 kW 2 kW+4 kW
Current
Capacity
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
16 A
9A
2 kW
1.0 MPa
(10 bar)
119 kg
1.0 MPa
(10 bar)
332 kg
118 kg
1.0 MPa
(10 bar)
331 kg
118 kg
1.0 MPa
(10 bar)
331 kg
3~, 400 V,
50 Hz
—
~/N, 230 V,
50 Hz
—
3~, 400 V,
50 Hz
—
32 A
26 A
32 A
26 A
—
—
—
—
16 A
13 A
*3 Do not fit immersion heaters without thermal cutout.
*2 Tested under BS7206 conditions .
*1 The environment must be frost-free.
16 A
13 A
3 kW
16 A
13 A
2 kW+4 kW 3 kW+6 kW 2 kW+4 kW 3 kW+6 kW
~/N, 230 V,
50 Hz
—
~/N, 230 V, 50 Hz
~/N, 230 V,
50 Hz
10A
Breaker (*when powered
from independent source)
Power supply
(Phase, voltage, frequency)
~/N, 230 V, 50 Hz
Power supply
(Phase, voltage, frequency)
Immersion heater Power supply
*3
(Phase, voltage, frequency)
Booster heater
—
0 (*1) - 35°C ( 80 % RH)
15.88 mm
23 min
Gas
20.5 min
9.52 mm
15.88 mm
Liquid
Time to reheat 70% of DHW tank to 65°C
Control board
119 kg
332 kg
28 mm compression primary circuit/ 22 mm compression DHW circuit/22 mm compression solar thermal (Ancillary heating) circuit
Grundfos UPSO 25-70 180
1.0 MPa
(10 bar)
Time to raise DHW tank temp 15 - 65°C
Refrigerant
(R410A)
Water
Temp & pressure relief valve
40 - 70°C
90°C
121°C
Thermal Cut Off (for dry run prevention)
Control thermistor
80°C
Manual reset thermostat
Min flow 5.5 l/min
Flow switch
Control thermistor
0.3 MPa (3 bar)
1 - 80°C
332 kg
Pressure relief valve
Control thermistor
12 L
1 bar
346 kg
131 kg
Charge pressure
1.0 MPa
(10 bar)
345 kg
Nominal volume
1.0 MPa
(10 bar)
345 kg
130 kg
130 kg
Weight (full)
346 kg
131 kg
346 kg
Weight (empty)
131 kg
1600 x 595 x 680 mm (Height x Width x Depth)
200L
EHST20C- EHST20C- EHST20C- EHST20C- EHST20C- EHPT20X- EHPT20X- EHPT20X- EHPT20X- EHPT20XVM6HA
YM9HA
VM6A
YM9A
VM6SA
VM2HA
VM6HA
YM9HA
VM6A
YM9A
Overall unit dimensions
Nominal domestic hot water volume
Model name
3
SPECIFICATIONS
Product specification
4
PART NAMES AND FUNCTIONS
<EHST20C-*M*HA/*M*A> (Split model system)
Number
B
A
F
2
1
Automatic air vent
2
Pressure relief valve
3
Expansion vessel
4
Main controller
5
Control and electrical box
7
Immersion heater (Only for EHST20C-*M*HA)
8
DHW tank
9
3-way valve
10
Water circulation pump
11
Manual air vent
12
Booster heater
13
Drain cock (Booster heater)
14
Strainer valve
15
Flow switch
12
16
Drain cock (Primary circuit)
17
Drain cock (DHW tank)
7
18
Plate heat exchanger
19
Manometer
1
19
E
J
K
3
4
5
8
9
11
10
17
13
15
14
18
Component
16
Figure 4-1
A
DHW outlet
B
Cold water inlet
E
Inlet from space heating
F
Outlet to space heating
J
Refrigerant (Gas)
K
Refrigerant (Liquid)
Number
<EHST20C-VM6SA> (Solar split model system)
Component
1
Automatic air vent
2
Pressure relief valve
3
Expansion vessel
4
Main controller
5
Control and electrical box
8
DHW tank
9
3-way valve
10
Water circulation pump
11
Manual air vent
12
Booster heater
13
Drain cock (Booster heater)
14
Strainer valve
15
Flow switch
16
Drain cock (Primary circuit)
17
Drain cock (DHW tank)
18
Plate heat exchanger
17
19
Manometer
A
DHW outlet
14
B
Cold water inlet
C
Outlet to solar
D
Inlet from solar
E
Inlet from space heating
F
Outlet to space heating
J
Refrigerant (Gas)
K
Refrigerant (Liquid)
B
C
D
A
F
2
1
19
E
J
K
3
4
5
8
9
11
10
12
13
15
18
16
Figure 4-2
<EHPT20X-VM2HA> (UK Packaged model system)
B
A
F
Number
2
Automatic air vent
2
Pressure relief valve
3
Expansion vessel
4
Main controller
5
Control and electrical box
6
Temperature and pressure relief valve (not visible)
7
Immersion heater
8
DHW tank
9
3-way valve
10
Water circulation pump
11
Manual air vent
12
Booster heater
13
Drain cock (Booster heater)
14
Strainer valve
7
15
Flow switch
16
Drain cock (Primary circuit)
13
15
17
Drain cock (DHW tank)
19
Manometer
A
DHW outlet
B
Cold water inlet
E
Inlet from space heating
F
Outlet to space heating
G
Inlet from heat pump
H
Outlet to heat pump
1
19
E
G
H
3
4
5
6
8
9
11
10
12
17
14
Component
1
16
Figure 4-3
<EHPT20X-*M*HA/*M*A (except EHPT20X-VM2HA)> (Packaged model system)
B
A
F
2
Number
Automatic air vent
2
Pressure relief valve
3
Expansion vessel
4
Main controller
5
Control and electrical box
7
Immersion heater (Only for EHPT20X-*M*HA)
8
DHW tank
9
3-way valve
10
Water circulation pump
11
Manual air vent
12
Booster heater
13
Drain cock (Booster heater)
12
14
Strainer valve
15
Flow switch
7
16
Drain cock (Primary circuit)
17
Drain cock (DHW tank)
19
Manometer
A
DHW outlet
B
Cold water inlet
E
Inlet from space heating
F
Outlet to space heating
G
Inlet from heat pump
H
Outlet to heat pump
1
19
E
G
H
3
4
5
8
9
11
10
17
13
15
14
Component
1
16
Figure 4-4
5
OUTLINES AND DIMENSIONS
(Unit: mm)
5-1. Technical Drawings
595
G1/2
Main controller
100±20
Air vent
Pressure relief valve
79
680
30
445
Temperature and
pressure relief valve
and its access plate
(EXPT20X-VM2HA only)
183
50
156
1600
1
950
1095
Terminal block
Front panel
<Left side>
<Right side>
<Front>
C
D
E
47.1
0
550.2
541.1
522.8
492.2
470.8
Letter
0
63.3
67.8
123
A
Pipe description
Connection size/type
A
DHW outlet connection
22 mm/Compression
B
Cold water inlet connection
22 mm/Compression
C/D
Solar (ancillary heat source) connection
22 mm/Compression
E
Space heating return connection
28 mm/Compression
F
Space heating flow connection
28 mm/Compression
G
Flow from heat pump connection
(No plate heat exchanger)
28 mm/Compression
H
Return to heat pump connection
(No plate heat exchanger)
28 mm/Compression
J
Refrigerant (GAS)
(With plate heat exchanger)
15.88 mm/Flare
K
Refrigerant (LIQUID)
(With plate heat exchanger)
9.52 mm/Flare
L
Electrical cable inlets
—
* The leftmost hole is for
wireless receiver (option)
(PAR-WR41R-E)
B
G/J
F
449.7
491.1
509.7
561.7
H/K
L
<Top>
5-2. Service access diagrams
a
Service access
Parameter
a
b
c (distance behind unit not visible
in the figure on the right)
d
Dimension (mm)
300
150
b
10
b
500
Sufficient space MUST be left for the provision of discharge pipework as
detailed in National and Local building regulations.
The cylinder unit must be located indoors and in a frost-free environment,
for example in a utility room, to minimise heat loss from stored water.
d
Service access
10
6
WIRING DIAGRAM
6-1. EHST20C-VM6HA
* See Chapter 6-10.
11
6-2. EHST20C-YM9HA
* See Chapter 6-10.
12
6-3. EHST20C-VM6A
EHST20C-VM6SA
* See Chapter 6-10.
13
6-4. EHST20C-YM9A
* See Chapter 6-10.
14
6-5. EHPT20X-VM2HA
* See Chapter 6-10.
15
6-6. EHPT20X-VM6HA
* See Chapter 6-10.
16
6-7. EHPT20X-YM9HA
* See Chapter 6-10.
17
6-8. EHPT20X-VM6A
* See Chapter 6-10.
18
6-9. EHPT20X-YM9A
* See Chapter 6-10.
19
6-10. Dip switch setting
<Dip Switch Functions>
Located on the FTC3 printed circuit board are 4 sets of small white switches
known as Dip switches. The Dip switch number is printed on the circuit board
next to the relevant switches. The word ON is printed on the circuit board and on
the Dip switch block itself. To move the switch you will need to use a pin or the
corner of a thin metal ruler or similar.
SW1
SW2 SW4
Dip switch settings are listed below in the table below.
SW3
Dip switch
SW1
SW1-1
Default (Indoor unit Ref.)
OFF
SW1-3
WITHOUT DHW tank
WITH DHW tank
SW1-4
Immersion heater
WITHOUT immersion heater
WITH immersion heater
SW1-5
Booster heater
WITHOUT booster heater
WITH booster heater
OFF:EH*****-*M**
ON :EH*****-*M*H*
ON
SW1-6
Booster heater function
For heating only
For heating and DHW
ON
SW1-7
Outdoor unit type
Split type
Packaged type
SW1-8
Wireless remote controller
SW2-1
Room thermostat input (IN1) logic change
WITHOUT wireless remote con- WITH wireless remote controller
troller
Operation stop at thermostat short Operation stop at thermostat open
OFF:EHS****-*M**
ON :EHP****-*M**
OFF
SW2-2
Flow switch input (IN2) logic change
Failure detection at short
Failure detection at open
ON
SW2-3
Booster heater capacity restriction
Inactive
Active
OFF
ON: EHPT20X-VM2HA
OFF
—
—
OFF:EHS****-*M** ( 1)
ON :EHP****-*M**
ON
—
Automatic switch to backup heater only op- Inactive
eration (When outdoor unit stops by error)
Active ( 3)
OFF
OFF
SW2-6
—
—
—
OFF
SW2-7
—
—
—
OFF
SW2-8
—
—
—
OFF
SW3-1
—
—
—
OFF
SW3-2
—
—
—
OFF
SW3-3
—
—
—
OFF
SW3-4~8
—
—
—
OFF
SW4-1~4
—
—
—
OFF
SW4-5
SW4-6
Notes:
—
60 °C
SW2-5
SW4
ON
—
55 °C
SW2-4
SW3
OFF
—
Heat pump maximum outlet water
temperature
DHW tank
SW1-2
SW2
Function
Emergency mode (Heater only operation)
Emergency mode (Heater only operation) OFF ( 2)
(To be activated only when powered ON)
OFF
—
Normal
—
—
1. For packaged model system, the max outlet water temperature is always 60°C so default Dip switch SW1-2 is ON.
For split model system, the max outlet water temperature is usually 55°C except in the case of PUHZ-HRP outdoor model where the max
outlet water temperature is 60°C and DIP switch SW1-2 should be changed to ON.
2. If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning SW4-5 to OFF position.
3. For safety reasons, this function is not available for certain errors. (System operation must be stopped and only pump keeps running.)
External output (OUT11) will be available.
Automatic switch to backup heater only operation
Back-up heater operation (*1) will automatically run when the indoor unit stops abnormally.
To enable the function, switch Dip SW 2-5 to ON.
During the back-up operation, an error code(s) and the contact number will be displayed alternately.
External output (OUT11) will be available.
To clear the fault(s), reset the power breakers on the indoor and outdoor units.
<Applicable error codes (*2)>
E6 to E9, Ed, P8, U1 to U8, Ud, UE, UF, UL, UP
(*1) Prolonged running of the back-up operation may affect the life of the heater.
(*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)
20
7
FIELD WIRING
Option 1: Cylinder unit powered via outdoor unit
<1 phase>
Cylinder unit
TB1
L
Outdoor unit
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
breaker
N
L
S1
N
S2
S2
S3
S3
S1
ECB1
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
L
N
ECB2
L
N
To control
board
ELB for
booster
heater
(Primary circuit)
ELB for
immersion
heater
(DHW tank)
* Installer MUST affix label A that is included with the manuals near each wiring diagram for cylinder and outdoor units.
<Figure 7-1>
Electrical connections 1 phase
Description
Power supply
Capacity (Indoor unit Ref.) Breaker
~/N 230 V 50 Hz
Cylinder unit - Outdoor unit
*2
3 × 1.5 (polar)
Cylinder unit - Outdoor unit earth
*2
1 × Min. 1.5
Cylinder unit - Outdoor unit S1 - S2
*3
AC230V
Cylinder unit - Outdoor unit S2 - S3
*3
DC24V
Circuit
rating
× size (mm²)
Immersion heater (DHW tank)
2 kW (E******-VM2**)
6 kW (E******-VM6**)
3 kW (E******-VM*H*)
Wiring
~/N 230 V 50 Hz
Wiring No.
Booster heater (Primary circuit)
16 A *1
32 A *1
16 A *1
Wiring
2.5 mm²
6.0 mm²
2.5 mm²
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes:
1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in
chattering of load contactor(s).
21
<3 phase>
Cylinder unit
TB1
L
Outdoor unit
Power
supply
3N~
400V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
breaker
N
L1
S1
L2
S2
S2
L3
S3
S3
S1
To control
board
N
ECB1
Power
Supply
3~
400V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Power
Supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
L1
L2
L3
ECB2
L
N
ELB for
booster
heater
(Primary circuit)
ELB for
immersion
heater
(DHW tank)
* Installer MUST affix label A that is included with the manuals near each wiring diagram for cylinder and outdoor units.
<Figure 7-2>
Electrical connections 3 phase
Description
Circuit
rating
Wiring
Wiring No.
× size (mm²)
Booster heater (Primary circuit)
Immersion heater (DHW tank)
Power supply
Capacity (Indoor unit Ref.) Breaker
3~ 400V 50Hz
~/N 230 V 50 Hz
9 kW
3kW (E******-VM*H*)
Cylinder unit - Outdoor unit
*2
3 × 1.5 (polar)
Cylinder unit - Outdoor unit earth
*2
1 × Min. 1.5
Cylinder unit - Outdoor unit S1 - S2
*3
AC230V
Cylinder unit - Outdoor unit S2 - S3
*3
DC24V
16 A *1
16 A *1
Wiring
2.5 mm²
2.5 mm²
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes:
1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in
chattering of load contactor(s).
22
BLACK
L
N
S1
CNO1
• Cylinder unit electrical box connector connections changed (see Figure 7-3)
• Outdoor unit DIP switch settings changed to SW8-3 ON
• Turn on the outdoor unit before the cylinder unit.
YELLOW
Initial settings
(Power supplied
by outdoor unit)
YELLOW
If the cylinder and outdoor units have separate power supplies, the following
requirements MUST be carried out:
BLACK
Option2: Cylinder unit powered by independent source.
S2
Black
CNO1
Cylinder unit
control board
S3
N
S2
CNO1
BLACK
S1
YELLOW
Modified settings
(Separate power
supply to
the cylinder unit)
BLACK
YELLOW
L
Black
CNO1
Cylinder unit
control board
S3
<1 phase>
<Figure 7-3>
Cylinder unit
TB1
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
breaker
L
N
Outdoor unit
Power
supply
~/N
230V
50Hz
Earth
leakage
breaker
Wiring
circuit
breaker
or
Isolating
switch
L
S1
S1
N
S2
S2
S3
S3
ECB1
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
L
N
ECB2
L
N
To control
board
ELB for
booster
heater
(Primary circuit)
ELB for
immersion
heater
(DHW tank)
* Installer MUST affix label A that is included with the manuals near each wiring diagram for cylinder and outdoor units.
<Figure 7-4>
Electrical connections 1 phase
Description
Power supply
Capacity (Indoor unit Ref.)
Breaker
Wiring
Booster heater (Primary circuit)
~/N 230 V 50 Hz
Immersion heater (DHW tank)
~/N 230 V 50 Hz
2 kW (E******-VM2**)
6 kW (E******-VM6**)
3kW (E******-VM*H*)
16 A *1
32 A *1
16 A *1
2.5 mm²
6.0 mm²
2.5 mm²
Circuit
rating
Wiring
Wiring No.
× size (mm²)
Cylinder unit power supply
Cylinder unit input capacity
Main switch (Breaker)
Cylinder unit power supply
Cylinder unit power supply earth
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit L - N
Cylinder unit - Outdoor unit S1 - S2
Cylinder unit - Outdoor unit S2 - S3
~/N 230 V 50 Hz
*1
*2
*3
*3
*3
16 A
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
AC230V
—
DC24V
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 120 m
*3. The values given in the table above are not always measured against the ground value.
Notes:
1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in
chattering of load contactor(s).
23
<3 phase>
Cylinder unit
TB1
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
breaker
L
N
Outdoor unit
Power
supply
3N~
400V
50Hz
Earth
leakage
breaker
Wiring
circuit
breaker
or
Isolating
switch
L1
S1
S1
L2
S2
S2
L3
S3
S3
To control
board
N
ECB1
Power
supply
3~
400V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker
or
Isolating
switch
L1
L2
L3
ECB2
L
N
ELB for
booster
heater
(Primary circuit)
ELB for
immersion
heater
(DHW tank)
* Installer MUST affix label A that is included with the manuals near each wiring diagram for cylinder and outdoor units.
<Figure 7-5>
Electrical connections 3 phase
Description
Power supply
Capacity (Indoor unit Ref.)
Breaker
Wiring
Booster heater (Primary circuit)
Immersion heater (DHW tank)
3~ 400V 50Hz
~/N 230 V 50 Hz
9 kW
3kW (E******-VM*H*)
16 A *1
16 A *1
2.5 mm²
2.5 mm²
Circuit
rating
Wiring
Wiring No.
× size (mm²)
Cylinder unit power supply
Cylinder unit input capacity
Main switch (Breaker)
Cylinder unit power supply
Cylinder unit power supply earth
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit L - N
Cylinder unit - Outdoor unit S1 - S2
Cylinder unit - Outdoor unit S2 - S3
~/N 230 V 50 Hz
*1
*2
*3
*3
*3
16 A
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
AC230V
—
DC24V
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 120 m
*3. The values given in the table above are not always measured against the ground value.
Notes:
1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in
chattering of load contactor(s).
24
8
WATER SYSTEM DIAGRAM
EHST20C-*M*HA / *M*A
EHST20C-VM6SA
25
EHPT20X-VM2HA
EHPT20X-*M*HA / *M*A
26
Filling the cylinder unit
1. Check all connections including factory fitted ones are tight.
2. Insulate pipe work between cylinder and outdoor unit.
3. Thoroughly clean and flush, system of all debris. (see section 4.2 of Installation Manual for detailed instructions.)
4. Fill cylinder with potable water. Fill primary heating circuit with water and suitable anti-freeze and inhibitor as necessary. Always use a filling loop with double
check valve when filling the primary circuit to avoid back flow contamination of water supply.
• Anti-freeze should always be used for package systems. It is the responsibility of the installer to decide if anti-freeze solution should be used in split systems
depending on each site’s conditions. Corrosion inhibitor should be used in both split and package systems.
• When connecting metal pipes of different materials insulate the joints to prevent a corrosive reaction taking place which will damage the pipework.
5. Check for leaks. If leaks are found, retighten the screws on the connections.
6. Pressurise system to 1 bar.
7. Release all trapped air using air vents during and following heating period.
8. Top up with water as necessary. (If pressure falls below 1 bar)
Filling the cylinder unit (Potable/DHW circuit)
Initial fill procedure:
1. Ensure all pipe joints and fittings are tight and secure.
2. Open the most distant DHW tap/outlet.
3. Slowly/gradually open the mains water supply to begin filling unit and DHW pipework.
4. Allow most distant tap to run free and release/purge residual air from installation.
5. Close tap/outlet to retain fully charged system.
Initial flush procedure:
1. Energise system to heat-up cylinder contents to a temperature of approx. 30 – 40°C.
2. Flush/drain the water contents to remove any residue/impurities resulting from the installation works. Use the cylinder drain cock to safely discharge the warmed
water to drain via a suitable hose.
3. On completion, close drain cock, re-fill system and resume system commissioning.
Draining the cylinder unit
WARNING: DRAINED WATER MAY BE VERY HOT
1. Before attempting to drain the cylinder isolate from the electrical supply to prevent the immersion and booster heaters burning out.
2. Isolate cold water feed to tank.
3. Attach a hose to the tank drain cock (No. 17 on Figure 4-1 to 4-4). The hose should be able to withstand heat as the emptied water could be very hot. The hose
should drain to a place lower than the tank bottom to encourage siphoning.
Open a hot water tap to start draining without a vacuum.
4. When the tank is drained close drain cock and hot tap.
5. Attach hose to booster heater drain cock and water circuit drain cock (No.13 and No. 16 on Figure 4-1 to 4-4). The hose should be able to withstand heat as the
emptied water could be very hot. The hose should drain to a place lower than the booster heater drain cock to encourage siphoning. Open the pump valves and
the strainer valves.
6. Water remains in the strainer still after the cylinder unit was drained.
Drain the strainer by removing the strainer cover.
27
9
CONTROLS
9-1. Main Controller
<Main controller parts>
A
F1
F3
F2
C
Name
Function
A
B
Screen
Menu
C
D
E
Back
Confirm
Power/Holiday
F1-4
Function keys
Screen in which all information is displayed
Access to system settings for initial set up and
modifications.
Return to previous menu.
Used to select or save. (Enter key)
If system is switched off pressing once will turn system on. Pressing again when system is switched on
will enable Holiday Mode. Holding the button down
for 3 secs will turn the system off. (*1)
Used to scroll through menu and adjust settings.
Function is determined by the menu screen visible
on screen A.
F4
*1
When the system is switched off or the power supply is disconnected, the
cylinder protection functions (e.g. freeze stat. function) will NOT operate.
Please beware that without these safety functions enabled the water circuit
is exposed to risk and may, potentially, be damaged.
E
B
Letter
D
<Main screen icons>
Icon
Description
2
Legionella
prevention
Heat pump
3
Electric heater
4
Target
temperature
When this icon is displayed ‘Legionella prevention
mode’ is active.
When this icon is displayed the ‘Heat pump’ is in
use.
When this icon is displayed the ‘Electric heaters’ are
in use.
Target flow temperature
1
12
11
2
1
3
10
4
9
5
OPTION
6
7
8
+
Information
9
Space heating
mode
DHW mode
Holiday mode
10
11
12
Target room temperature
Compensation curve
Pressing the function button below this icon will display the quick view menu.
Increase desired temperature.
Decrease desired temperature.
Pressing the function button below this icon displays
the information screen.
Heating mode
Normal or ECO mode
When this icon is displayed ‘Holiday mode’ activated.
Timer
Prohibited
8
7
6
5
Stand-by
Stop
Operating
28
<Main Controller Menu Tree>
Initial
Unrestricted access
Installer only
Main screen F1
Information
Option
F4
F1
F2
F3
F4
Forced DHW
DHW
Heating
Holiday
ON/OFF
ON/OFF/Timer
ON/OFF/Timer
Active/Non active
Set time
Main menu
DHW
Normal
Eco
Edit
DHW max. temp
DHW max. temperature drop
DHW max. operation time
DHW mode restriction
Legionella
Active/Non active
Edit
Hot water temp.
Frequency
Start time
Max. operation time
Duration of max. temp.
Heating mode
Heating
F2 (PREVIEW)
F3 (EDIT)
Flow temp
Room temp
Compensation curve
Compensation curve preview
Compensation curve edit
F2, F3
F4
Schedule timer menu
Heating
DHW
}
Curve parameters
Adjustment
Schedule timer preview
Day select
Time select
Time setting
Temp. setting
Holiday setting
F1
F2
F3 (EDIT)
DHW active /non active
Heating active/non active
Holiday menu
Heating room temp.
Heating flow temp.
Initial settings
Date/Time
Language
°C/°F
Temp. display
Contact number
Time display
Room sensor setting
Service menu
yyyy/mm/dd/hh:mm
ENG/GER/FR/NL/SP/IT/PT/DA/SW/NOR/FIN
°C/°F
ON/OFF
hh:mm/hh:mm AM/AM hh:mm
Sensor setting
Select Time/Zone
TH1/Main controller/Room RC1-8/Time/Zone
(Password protected)
Manual operation
Function setting
Thermistor adjustment
Auxiliary setting
Heat source setting
Operation setting
Running information
Thermistor reading
Summary of setting
Error history
Password protection
Manual reset
29
Economy setting for pump
ON
Delay
Freeze stat function
Flow t.
Ambient
Electric heater (Heating)
ON
Delay
Electric heater (DHW)
ON
Delay
Standard (Heat pump & electric heaters)
Heater (Electric heaters only)
Simultaneous operation
Cold weather function
Room temp. control (Heating)
Temp. control interval
Flow temperature range
Main controller
FTC3
Yes/No
Yes/No
9-2. Service Menu
The service menu provides functions for use by installer or service engineer. It
is not intended the home owner alters settings within this menu. It is for this
reason password protection is required to prevent unauthorised access to the
service settings.
rom the main setting menu use F2 and F3 to highlight the service icon then
1. F
press CONFIRM.
. You will be prompted to enter a password. THE FACTORY DEFAULT PASSWORD IS 0000.
3. Press CONFIRM.
(It takes approx. 30 secs to load the service menu.)
Screen 1 of service menu
The service menu is navigated using the F1 and F2 buttons to scroll through the
functions. The menu is split across two screens and is comprised of the following
functions;
1. Manual operation
. Function setting
3. Thermistor adjustment
4. Auxiliary setting
5. Heat source setting
6. Operation setting
7. Running information
8. Thermistor reading
9. Summary of setting
10. Error history
11. Password protection
1. Manual reset
In this Installation Manual instructions will be given only for the following functions;
1. Auxiliary setting
. Manual operation
3. Heat source setting
4. Password protection
5. Manual reset
Screen 2 of service menu
Information on the other functions can be found by consulting the technical or
service manuals.
<General operation>
Many functions can not be set whilst the indoor unit is running. The installer
should turn off the unit before trying to set these functions. If the installer attempts to change the settings whilst the unit is running the main controller will
display a reminder message prompting the installer to stop operation before continuing. By selecting Yes the unit will cease operation and changes can be made
to the service settings.
If text is displayed in white on a black background CONFIRM button must be
pressed to save this choice.
System off prompt screen
Action requires confirmation
30
Action is confirmed
Auxiliary Setting
This function is used to set the parameters for any auxiliary parts used in the system.
From the service menu use F1 and F2 buttons to highlight Auxiliary setting then
press CONFIRM.
Auxiliary setting menu screen
<Economy settings for pump>
1. From the Auxiliary setting menu highlight Economy Settings for pump.
. Press CONFIRM.
3. The economy settings for pump screen will be displayed.
4. Use button F1 to switch the pump ON/OFF.
5. Use buttons F3 and F4 to adjust the time the pump will run. (3 - 60 mins)
Economy settings for pump screen
<Frost prevention>
1. From the Auxiliary setting menu highlight Freeze Stat Function.
. Press CONFIRM.
3. The freeze stat function screen will be displayed.
4. Use buttons F3 and F4 to adjust the minimum outdoor temperature which
freeze stat function will begin to operate, (3 - 20 °C) or choose .
If asterisk ( ) is chosen freeze stat function is deactivated/disabled (i.e. freeze
risk).
Freeze stat function screen
<Electric heater (Heating)>
1. From the Auxiliary Setting menu highlight Electric heater (Heating).
. Press CONFIRM.
3. The Electric heater (Heating) screen is displayed.
4. Press F1 button to switch the function ON/OFF.
5. Use F3 and F4 buttons to adjust the time period of Heat pump only operation
before the booster heater will assist in space heating. (5 -180mins)
Electric heater (Heating) screen
<Electric heater (DHW)>
1. From the Auxiliary Setting menu highlight Electric heater (DHW).
. Press CONFIRM.
3. The Electric heater (DHW) screen is displayed.
4. Press F1 button to switch the function ON/OFF.
5. Use F3 and F4 buttons to adjust the time period of Heat pump only operation
before the booster heater and the immersion heater (if present) will assist in
DHW heating. (15 -30mins)
Electric heater (DHW) screen
31
<Manual operation>
During the filling of the system the pump and 3-way valve can be manually overridden using manual operation mode.
When manual operation is selected a small timer icon appears in the screen. The
function selected will only remain in manual operation for a maximum of 2 hours.
This is to prevent accidental permanent override of the FTC3.
rom the service menu use F1 and F2 buttons to scroll through list until Manu1. F
al Operation is highlighted.
. Press CONFIRM.
3. Manual operation menu screen is displayed.
4. To activate manual operation press the function button under the desired part.
5. To return to service menu press MENU or BACK button.
Manual operation menu screen
►Example
Pressing F3 button will switch manual operation mode ON for the main 3-way
valve. When filling of the tank is complete the installer should access this menu
again and press F3 to deactivate manual operation of the part. Alternatively after
2 hours manual operation mode will no longer be active and FTC3 will resume
control of the part.
NOTE:
Manual operation and heat source setting can not be selected if the system
is running. A screen will be displayed asking the installer to stop the system before these modes can be activated.
The system automatically stops 2 hours after last operation.
The OUT13 output of the 2-way valve 2 constitutes an inversion of the OUT4
output of the 2-way valve 1.
System off prompt screen
<Function Setting>
Function Setting allows the setting of auto recovery after power failure only.
1. From the service menu use F1 and F2 to highlight Function Setting.
2. Press CONFIRM.
3. Ensure the Ref address and unit number are displayed to the right.
4. Press CONFIRM.
NB Changes can ONLY be made to Mode 1.
6. Use F3 and F4 to highlight either 1/2/3 (see below).
7. Press CONFIRM.
Mode 1 Setting number meanings
1 - Power failure automatic recovery NOT available
2 - Power failure automatic recovery AVAILABLE
(Aprox 4-minute delay after power is restored.)
3 - NO FUNCTION
<Thermistor Adjustment>
This function allows adjustments to be made to the thermistor readings from
-10 – 10 °C in 0.5 °C intervals.
1. From the Service menu highlight Thermistor Adjustment
2. Press CONFIRM.
3. Use F1 and F2 to select thermistor.
4. Press CONFIRM.
5. Use F2 and F3 to change the thermistor temperature.
6. Press CONFIRM.
32
<Heat source setting>
The default heat source setting is heat pump and all electric heaters present in
the system to be operational. This is referred to as Standard operation on the
menu.
1. F
rom the service menu use F1 and F2 buttons to scroll through list until Heat
Source Setting is highlighted.
. Press CONFIRM.
3. Heat source setting menu screen is displayed.
4. Press F3 button until preferred heat source is displayed.
5. Press CONFIRM.
6. To return to service menu press MENU or BACK button.
7. If you wish to return to the service menu without saving the setting press return button. You will be asked if you are sure you wish to cancel the changes.
Choose Yes or No as appropriate.
Heat source setting screen
Cancel last action screen
Operation Setting Menu
1. T
o access the Operation setting menu use F1 and F2 buttons to scroll through
the service menu until Operation setting is highlighted.
. Press CONFIRM.
3. Operation setting menu is displayed.
Operation setting menu screen
<Simultaneous Operation>
For periods of very low outside temperature this mode can be used. Simultaneous operation allows both DHW and space heating to be provided simultaneously
by using the heat pump to provide space heating whilst only the immersion heater
(if fitted) provides heating for DHW. This operation is only available if BOTH a
DHW tank AND immersion heater are present on the system.
rom the Operation setting menu use F1 and F2 buttons to scroll through the
1. F
list until Simultaneous operation is highlighted.
. Press CONFIRM.
3. Simultaneous operation screen is displayed.
4. To switch simultaneous operation ON/OFF press F1.
5. To alter the temperature at which simultaneous operation starts use F3 and F4.
Note: Range of ambient (outdoor) temperature is -15°C to 10°C (default -15°C).
6. To return to Operation setting menu press BACK.
Simultaneous operation screen
<Cold weather function>
For extremely low outdoor temperature conditions when the heat pump’s capacity is severely restricted the heating or DHW is provided by only the electric
booster heater (and immersion if present). This function is intended for use during
extreme cold periods only. Extensive use of direct electrical heaters ONLY will
result in higher electric usage and may reduce working life of heaters and related
parts.
rom the Operation setting menu use F1 and F2 buttons to scroll through the
1. F
list until Cold weather function is highlighted.
. Press CONFIRM.
3. Cold weather function screen is displayed.
4. To switch Cold weather function ON/OFF press F1.
5. To alter the temperature at which heater switching function starts use F3 and F4.
Note: Range of ambient (outdoor) temperature is -15°C to -10°C (default -15°C)
6. To return to Operation setting menu press BACK.
33
Cold weather function screen
<Room Temp Control (Heating)>
This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC3 collects and processes data for
the auto adaptation mode.
rom the Operation setting menu use F1 and F2 buttons to scroll through the
1. F
list until Room temp. control (HEATING) is highlighted.
. Press CONFIRM.
3. Room temp. control (HEATING) screen is displayed.
4. To alter the time period at which date will be collected use F1 and F2 buttons
to highlight ‘Temp. control interval’.
5. Press CONFIRM.
6. Use F3 and F2 buttons to alter the time interval.
Note: Range 10 – 60 minutes at 10 minute intervals (default 10 minutes).
7. To alter the flow temperature limits, use F1 and F2 buttons to highlight ‘Flow
temperature range’.
8. Press CONFIRM.
Flow temperature range screen is displayed.
9. To alter minimum flow temp. use F1 and F2 buttons.
Note: Range of minimum flow temp. is 25°C to 40°C (default 30°C).
10. To alter maximum flow temp. use F3 and F4 buttons.
Note: Range of maximum flow temp. is 35°C to 60°C (default 50°C)
11. To return to Operation setting menu press BACK twice.
Room temp. control (HEATING) screen
<Running Information>
This function shows current temperature and other data of main component parts
of both the indoor and outdoor units.
1. From the Service menu highlight Running information.
2. Press CONFIRM.
3. Use the function buttons to enter index code for the component to be viewed.
(See the Table 9-2-1 for component index codes.)
4. Press CONFIRM.
<Table 9-2-1>
Request
code
154
162
163
164
165
175
176
190
191
340
512
Request content
Range
Indoor unit pump - Accumulated operating time (after reset)
Indoor unit - Dip SW1 setting information
Indoor unit - Dip SW2 setting information
Indoor unit - Dip SW3 setting information
Indoor unit - Dip SW4 setting information
Indoor unit - Output signal information
Indoor unit - Input signal information
Indoor unit - Software version 1st 4 digits
Indoor unit - Software version last 4 digits
Indoor unit pump - Accumulated operating time reset
Indoor unit - Booster heater temp. (THW3)
0 - 9999
Refer to detail contents described hereinafter
Refer to detail contents described hereinafter
Refer to detail contents described hereinafter
Refer to detail contents described hereinafter
Refer to detail contents described hereinafter
Refer to detail contents described hereinafter
Refer to Note below
Refer to Note below
—
3 - 217
Unit
10 hours
—
—
—
—
—
—
—
—
—
°C
Note
Refer to outdoor unit service manual for request code 0 to 149.
As only four digits can be displayed at one time the software version number is displayed in two halves.
Enter code 190 to see the first four digits and code 191 to see the last four digits.
For example software version No. 5.01 A000, when code 190 is entered 0501 is displayed, when code 191 is entered A000 is displayed.
<Thermistor reading> shows all the thermistor temperature except THW3.
34
Indoor unit switch setting display (Request code: 162 to 165)
0: OFF
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0: OFF
1: ON
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SW1, SW2, SW3, SW4
3
4
5
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Display
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
00 00
00 01
00 02
00 03
00 04
00 05
00 06
00 07
00 08
00 09
00 0A
00 0B
00 0C
00 0D
00 0E
00 0F
00 10
00 11
00 12
00 13
00 14
00 15
00 16
00 17
00 18
00 19
00 1A
00 1B
00 1C
00 1D
00 1E
00 1F
00 20
00 21
00 22
00 23
00 24
00 25
00 26
00 27
00 28
00 29
00 2A
00 2B
00 2C
00 2D
00 2E
00 2F
00 30
00 31
00 32
00 33
00 34
00 35
00 36
00 37
00 38
00 39
00 3A
00 3B
00 3C
00 3D
00 3E
00 3F
35
1: ON
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SW1, SW2, SW3, SW4
3
4
5
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Display
00 40
00 41
00 42
00 43
00 44
00 45
00 46
00 47
00 48
00 49
00 4A
00 4B
00 4C
00 4D
00 4E
00 4F
00 50
00 51
00 52
00 53
00 54
00 55
00 56
00 57
00 58
00 59
00 5A
00 5B
00 5C
00 5D
00 5E
00 5F
00 60
00 61
00 62
00 63
00 64
00 65
00 66
00 67
00 68
00 69
00 6A
00 6B
00 6C
00 6D
00 6E
00 6F
00 70
00 71
00 72
00 73
00 74
00 75
00 76
00 77
00 78
00 79
00 7A
00 7B
00 7C
00 7D
00 7E
00 7F
Indoor unit switch setting display (Request code: 162 to 165)
0: OFF
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0: OFF
1: ON
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SW1, SW2, SW3, SW4
3
4
5
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Display
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
00 80
00 81
00 82
00 83
00 84
00 85
00 86
00 87
00 88
00 89
00 8A
00 8B
00 8C
00 8D
00 8E
00 8F
00 90
00 91
00 92
00 93
00 94
00 95
00 96
00 97
00 98
00 99
00 9A
00 9B
00 9C
00 9D
00 9E
00 9F
00 A0
00 A1
00 A2
00 A3
00 A4
00 A5
00 A6
00 A7
00 A8
00 A9
00 AA
00 AB
00 AC
00 AD
00 AE
00 AF
00 B0
00 B1
00 B2
00 B3
00 B4
00 B5
00 B6
00 B7
00 B8
00 B9
00 BA
00 BB
00 BC
00 BD
00 BE
00 BF
36
1: ON
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SW1, SW2, SW3, SW4
3
4
5
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Display
00 C0
00 C1
00 C2
00 C3
00 C4
00 C5
00 C6
00 C7
00 C8
00 C9
00 CA
00 CB
00 CC
00 CD
00 CE
00 CF
00 D0
00 D1
00 D2
00 D3
00 D4
00 D5
00 D6
00 D7
00 D8
00 D9
00 DA
00 DB
00 DC
00 DD
00 DE
00 DF
00 E0
00 E1
00 E2
00 E3
00 E4
00 E5
00 E6
00 E7
00 E8
00 E9
00 EA
00 EB
00 EC
00 ED
00 EE
00 EF
00 F0
00 F1
00 F2
00 F3
00 F4
00 F5
00 F6
00 F7
00 F8
00 F9
00 FA
00 FB
00 FC
00 FD
00 FE
00 FF
Output signal display (Request code: 175)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
0: OFF
1: ON
0: OFF
OUT
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1: ON
OUT
Display
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
xx 00
xx 01
xx 02
xx 03
xx 04
xx 05
xx 06
xx 07
xx 08
xx 09
xx 0A
xx 0B
xx 0C
xx 0D
xx 0E
xx 0F
xx 10
xx 11
xx 12
xx 13
xx 14
xx 15
xx 16
xx 17
xx 18
xx 19
xx 1A
xx 1B
xx 1C
xx 1D
xx 1E
xx 1F
xx 20
xx 21
xx 22
xx 23
xx 24
xx 25
xx 26
xx 27
xx 28
xx 29
xx 2A
xx 2B
xx 2C
xx 2D
xx 2E
xx 2F
xx 30
xx 31
xx 32
xx 33
xx 34
xx 35
xx 36
xx 37
xx 38
xx 39
xx 3A
xx 3B
xx 3C
xx 3D
xx 3E
xx 3F
37
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Display
xx 40
xx 41
xx 42
xx 43
xx 44
xx 45
xx 46
xx 47
xx 48
xx 49
xx 4A
xx 4B
xx 4C
xx 4D
xx 4E
xx 4F
xx 50
xx 51
xx 52
xx 53
xx 54
xx 55
xx 56
xx 57
xx 58
xx 59
xx 5A
xx 5B
xx 5C
xx 5D
xx 5E
xx 5F
xx 60
xx 61
xx 62
xx 63
xx 64
xx 65
xx 66
xx 67
xx 68
xx 69
xx 6A
xx 6B
xx 6C
xx 6D
xx 6E
xx 6F
xx 70
xx 71
xx 72
xx 73
xx 74
xx 75
xx 76
xx 77
xx 78
xx 79
xx 7A
xx 7B
xx 7C
xx 7D
xx 7E
xx 7F
Indoor unit switch setting display (Request code: 175)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
0: OFF
1: ON
0: OFF
OUT
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1: ON
OUT
Display
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
xx 80
xx 81
xx 82
xx 83
xx 84
xx 85
xx 86
xx 87
xx 88
xx 89
xx 8A
xx 8B
xx 8C
xx 8D
xx 8E
xx 8F
xx 90
xx 91
xx 92
xx 93
xx 94
xx 95
xx 96
xx 97
xx 98
xx 99
xx 9A
xx 9B
xx 9C
xx 9D
xx 9E
xx 9F
xx A0
xx A1
xx A2
xx A3
xx A4
xx A5
xx A6
xx A7
xx A8
xx A9
xx AA
xx AB
xx AC
xx AD
xx AE
xx AF
xx B0
xx B1
xx B2
xx B3
xx B4
xx B5
xx B6
xx B7
xx B8
xx B9
xx BA
xx BB
xx BC
xx BD
xx BE
xx BF
38
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Display
xx C0
xx C1
xx C2
xx C3
xx C4
xx C5
xx C6
xx C7
xx C8
xx C9
xx CA
xx CB
xx CC
xx CD
xx CE
xx CF
xx D0
xx D1
xx D2
xx D3
xx D4
xx D5
xx D6
xx D7
xx D8
xx D9
xx DA
xx DB
xx DC
xx DD
xx DE
xx DF
xx E0
xx E1
xx E2
xx E3
xx E4
xx E5
xx E6
xx E7
xx E8
xx E9
xx EA
xx EB
xx EC
xx ED
xx EE
xx EF
xx F0
xx F1
xx F2
xx F3
xx F4
xx F5
xx F6
xx F7
xx F8
xx F9
xx FA
xx FB
xx FC
xx FD
xx FE
xx FF
Output signal display (Request code: 175)
Input signal display (Request code: 176)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
Please refer to Table 1 on relevant wiring diagram whilst using the following.
0: OFF
0: OFF (open)
9
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1: ON
10
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
11
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
OUT
12
13
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1: ON (short)
IN
Display
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
00 xx
01 xx
02 xx
03 xx
04 xx
05 xx
06 xx
07 xx
08 xx
09 xx
0A xx
0B xx
0C xx
0D xx
0E xx
0F xx
10 xx
11 xx
12 xx
13 xx
14 xx
15 xx
16 xx
17 xx
18 xx
19 xx
1A xx
1B xx
1C xx
1D xx
1E xx
1F xx
39
2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Display
00 00
00 01
00 02
00 03
00 04
00 05
00 06
00 07
00 08
00 09
00 0A
00 0B
00 0C
00 0D
00 0E
00 0F
00 10
00 11
00 12
00 13
00 14
00 15
00 16
00 17
00 18
00 19
00 1A
00 1B
00 1C
00 1D
00 1E
00 1F
<Thermistor Reading>
This function shows the current readings of thermistors located on the water and refrigerant circuit
Thermistor Description
TH1
Room temperature
Refrigerant return temperature
TH2
THW1
Water flow temperature
Water return temperature
THW2
TH5A
—
TH5B
Tank temperature
TH5C
—
TH7
Ambient (outdoor) temperature
<Summary of Settings>
This function shows the current installer/user entered settings.
Abbreviation
HWtemp
HWdrop
HWtime
NO HW
HWset
Explanation
DHW max temp
DHW temperature drop
DHW max operation time
DHW mode restriction
DHW operation mode (Normal/Eco)
Ltemp
Lfreq
Lstart
Ltime
Lkeep
Legionella hot water temp
Legionella operation Frequency
Legionella mode start time
Legionella max. operation time
Duration of max (Legionella) hot
water temp
Abbreviation Explanation
mode
Operation mode
- HER (Heating room temp)
- HE (Heating flow temp)
- HCC (Heating compensation curve)
- COR (—)
- CO (—)
Hroom
Heating target room temp
Hflow
Heating target flow temp
Croom
—
Cflow
—
Freeze stat function flow temp
FSflow
FSout
Freeze stat function ambient temp
<Error History>
Error history allows the service engineer to view previous Error codes, the unit
address and the date on which they occurred. Up to 16 Error codes can be stored
in the history the most recent Error event is displayed at the top of the list.
1. From the service menu select Error history
. Press CONFIRM.
Please see chapter 10-4. for error code diagnosis and actions.
To delete an Error history item;
1. From Error history screen press F4 button (Rubbish bin icon)
. Then press F3 button (Yes).
40
<Password protection>
Password protection is available to prevent unauthorised access to the service
menu by untrained persons.
1. F
rom the service menu use F1 and F2 buttons to scroll through list until Password protection is highlighted.
. Press CONFIRM.
3. When password input screen is displayed use buttons F1 and F2 to move left
and right between the four digits, F3 to lower the selected digit by 1, and F4 to
increase the selected digit by 1.
4. When you have input your password press CONFIRM.
5. The password verify screen is displayed.
6. To verify your new password press button F3.
7. Your password is now set and the completion screen is displayed.
8. To return to service menu press MENU or BACK button.
Password input screen
<Resetting the password>
If you forget the password you entered, or have to service a unit somebody else
installed, you can reset the password to the factory default of 0000.
rom the main settings menu scroll down the functions until Service Menu is
1. F
highlighted.
. Press CONFIRM.
3. You will be prompted to enter a password.
4. Hold down buttons F3 and F4 together for 3 secs.
5. You will be asked if you wish to continue and reset the password to default setting.
6. To reset press button F3.
7. The password is now reset to 0000.
Password verify screen
Completion screen
<Manual reset>
Should you wish to restore the factory settings at any time you should use the
manual reset function. Please note this will reset ALL functions to the factory default settings.
rom the service menu use F1 and F2 buttons to scroll through list until Manu1. F
al Reset is highlighted.
. Press CONFIRM.
3. The manual reset screen is displayed.
4. Choose either Manual Reset for FTC3 or main controller.
5. Press F3 button to confirm manual reset of chosen device.
41
<Emergency operation>
In Emergency operation mode the outdoor heat pump unit will not operate. Heating for DHW and space heating is provided by the booster heater and the tank
immersion heater (if installed). Space heating flow temp is restricted 40°C if an
immersion heater is not present on the DHW tank then the booster heater will
also indirectly heat the DHW.
When in Emergency operation the main control has NO control functions. It's only
function is to display the Main screen and Information screen by pressing F1, all
other buttons are disabled.
• Activating Emergency operation mode
To activate Emergency operation see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
. Change DIP switch SW4-5 to ON.
3. Switch ON the breaker(s).
4. Emergency Operation is now activated.
F1
• Deactivating Emergency operation mode
To deactivate Emergency operation see the following:
1. Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
. Change DIP switch SW4-5 to OFF.
3. Switch ON the breaker(s).
4. Emergency operation is now deactivated.
WARNING
Do not attempt to change the DIP switches whilst the breaker(s) are ON as
this could result in Electrocution.
42
F2
F3
F4
10
TROUBLESHOOTING
10-1. Troubleshooting
<Summary of self diagnosis based on Error Codes and Service Procedures>
Present and past Error codes are logged and displayed on the main controller or control board of the outdoor unit.
Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field.
Unit Condition
Reoccurring problem
Error Code
Displayed
Not Displayed
Non reoccurring problem
Action
Use table 10-4. "Self diagnosis and action" to identify fault and correct.
Use table 10-5. "Troubleshooting by inferior phenomena" to identify fault and correct.
Logged
1. Check temporary causes of defects such as the operation of safety devices on the refrigerant/water
circuit including compressor, poor wiring, electrical noise etc. Re-check the symptom and the installation environment, refrigerant amount (Split systems only), weather conditions at time of fault etc.
2. Reset Error code logs, Service the unit and restart system.
Not Logged
1. Recheck the abnormal symptom
2. Identify cause of problem and take corrective action according to Table 10-5. "Troubleshooting by
inferior phenomena"
3. If no obvious problem can be found continue to operate the unit.
NOTE
Electrical components should only be replaced as a final option. Please follow instructions in Tables 10-4. and 10-5. Error Codes and Inferior Phenomena fully before resorting to replacing parts.
10-2. Test Run
Before a test run
• After installation of outdoor unit, pipework and electrical wiring, recheck that there is no water leakage, loosened connections or miswiring.
• Measure impedance between the ground and the power supply terminal block (L,N) on the outdoor and indoor units with suitable (500V) ohmmeter. Resistance
should be ≥ 1.0MΩ .
• Read the Installation and Operation Manuals fully especially the safety requirements before carrying out any test runs.
10-3. Malfunction diagnosis method by main controller
If during start up or operation a malfunction occurs the error code screen may be displayed on the main controller.
The error code screen shows the following; code, unit, ref. address, and telephone number of installer (only if previously entered by the installer)
Please not in the case of some malfunctions an error code is not generated please refer to table 10-5. for more details.
To reset
1. To reset the main controller press F4 button (Reset).
2. Then press F3 (Yes) to confirm.
43
10-4. Self diagnosis and action
Check if Dip SW is set correctly. (Refer to Chapter 6-10.)
Error code
L1
Title and display conditions
Possible Cause
Booster heater overheat detection
1 Insufficient system head
<DHW/Heating/LP/FS/OS>
Error code displayed when THW3 detects
temp. of ≥ 85ºC for 10 consecutive seconds.
2 Reduced flow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insufficient air purge, blockedstrainer, leak in water circuit.
3 Valve operation fault
DHW : Domestic hot water mode
Heating : Heating mode
LP
: Legionella prevention mode
FS
: Freeze stat
OS
: Operation stop
: Room temp. thermistor
TH1
TH2
: Liquid refrigerant temp. thermistor
THW1 : Flow water temp. thermistor
THW2 : Return water temp. thermistor
THW3 : Booster heater temp. thermistor
THW5B : Tank water temp. thermistor
if system pump meets requirements.
If more head required either add an pump
of the same size or replace existing pump
with capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2 Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3 Check valves on primary water circuit are
installed level.
4 2-way valve (Locally supplied) actuator fault
4 Electrically test to determine fault.
5 3-way valve actuator fault
5 1) Electrically test to determine fault.
7 Power supply voltage increase
7 Check the supply voltage.
2) Operate 3-way valve manually using
the main remote controller. (Refer to
<Manual operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure 6 in “11. DISASSEMBLY PROCEDURE.”
6 Booster heater relay (BHC1, BHC2, BHCP) 6 Electrically test the relays (BHC1, BHC2,
operating fault
BHCP) to determine fault.
See 10-6. for how to check
8 THW1 has become detached from its holder. 8 Visually inspect location and reattach as
necessary.
9 Check resistance of thermistor against table
9 THW3 fault
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
0 FTC3 board failure
L2
Diagnosis and action
1 Refer to table in section 10-6. to determine
Booster heater thermistor (THW3) failure 1 Connector/terminal wire has become
<DHW/Heating/LP/FS>
detached or loose wiring.
Error code displayed when THW3 is at open
(≤ 1.31ºC) or short (≥ 219.42ºC).
Exceptions
Error code will not be displayed if;
During defrost and 10 mins after defrost
operation,
For 10 mins after pump1 is switched on, 2 THW3 fault
When THW1 < 10deg.
0 Replace board.
1 Visually check the terminals and connections
and reattach as appropriate.
2 Check resistance of thermistor against table
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
3 FTC3 board failure
44
3 Replace board.
Error code
L3
Title and display conditions
Circulation water temperature overheat
protection
<DHW/Heating/LP/FS/OS>
Error code displayed when THW1 detects
a temp. ≥ 80ºC for 10 consecutive seconds
or THW2 detects a temp ≥ 80ºC for 10
consecutive seconds.
Possible Cause
Diagnosis and action
1 Insufficient system head
1 Refer to table in section 10-6. to determine if
system pump meets requirements.
If more head required either add an pump of
the same size or replace existing pump with
capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2 Reduced flow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insufficient air purge, blockedstrainer, leak in water circuit.
3 Valve operation fault
2 Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the recommended range.
3 Check valves on primary water circuit are
installed level.
4 2-way valve (field supply) actuator fault
4 Electrically test to determine fault.
5 3-way valve actuator fault
5 1) Electrically test to determine fault.
7 Power supply voltage increase
7 Check the supply voltage.
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual
operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
6 Booster heater relay (BHC1, BHC2, BHCP) 6 Electrically test the relays (BHC1, BHC2,
operating fault
BHCP) to determine fault.
See 10-6. for how to check.
8 THW1 or THW3 or THW5B has become 8 Visually inspect location and reattach as
detached from its holder.
necessary.
9 Check resistance of thermistor against table
9 THW1 or THW2 fault
L4
L5
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
0 FTC3 board failure
0 Replace board.
Tank water temperature overheat protection 1 3-way valve actuator fault
1 1) Electrically test to determine fault.
<DHW/Heating/LP/FS/OS>
2) Operate 3-way valve manually using the
Error code display when THW5B detects a
main remote controller. (Refer to <Manual
temp. ≥ 75ºC for 10 consecutive seconds.
operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
2 Immersion heater relay (IHC) operating fault 2 Check immersion heater relay (IHC)
Indoor unit temperature thermistor
(TH1, TH2, THW1, THW2, THW5B) failure
<DHW/Heating/LP/FS/OS>
Error code displayed when thermistor is at
open or short (see table).
3 THW5B fault
3 Check resistance of thermistor against table
4 FTC3 board failure
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
4 Replace board.
1 Connector/terminal wire has become
1 Visually check the terminals and connections
2 Thermistor fault
2 Check resistance of thermistor against table
detached or loose wiring.
and reattachas appropriate.
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
3 Replace board.
3 FTC3 board failure
Exceptions
Error code will not be displayed for TH2;
During defrost and for 10 mins after defrost 4 The thermistor on the wireless remote con- 4 Replace wireless remote controller or main
troller or the main remote controller may be
remote controller
operation.
defective. (when Room temp. is chosen for
the Heating operation and when Main Controller or Room RC 1-8 is chosen for the
Room Sensor setting in the Initial setting)
5 Incorrect setting of the Dip switch(es)
5 Check the Dip switch setting(s).
Thermistor
Symbol
TH1
TH2
THW1
THW2
THW5B
Name
Room temperature thermisitor
Liquid temperature thermisitor
Flow water temperature thermisitor
Return water temperture thermisitor
Tank water temperture thermisitor
45
Open detection
Short detection
-39ºC or below
-39ºC or below
-39ºC or below
-39ºC or below
-39ºC or below
88.5ºC or above
88.5ºC or above
88.5ºC or above
88.5ºC or above
88.5ºC or above
Error code
L6
Title and display conditions
Circulation water freeze protection
<DHW/Heating/LP/FS/OS>
Error code displayed when THW1 detects
a temp. ≤ 1ºC for 10 consecutive seconds
or THW2 detects a temp. ≤ 3ºC for 10 consecutive seconds.
Exception
Error code will not be displayed if;
FS function is disabled,
For 10 mins after water circulation pump1 is
switched on.
Possible Cause
1 Insufficient system head
Diagnosis and action
1 Refer to table in section 10-6. to determine if
system pump meets requirements.
If more head required either add an pump of
the same size or replace existing pump with
capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2 Reduced flow in primary water circuit. Due to 2 Check circulation pump (See 10-6. for how
1 or more of the following;
Faulty pump, insufficient air purge, blockedstrainer, leak in water circuit.
3 Valve operation fault
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3 Check valves on primary water circuit are installed level.
4 2-way valve (field supply) actuator fault
4 Electrically test to determine fault.
5 3-way valve actuator fault
5 1) Electrically test to determine fault.
7 THW1 or THW2 fault
7 Check resistance of thermistor against table
8 FTC3 board failure
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
8 Replace board.
1 3-way valve actuator fault
1 1) Electrically test to determine fault.
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual
operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
6 THW1 has become detached from its holder. 6 Visually inspect location and reattach as
necessary.
L7
3-way valve failure (Valve direction
defaults to DHW circuit)
<Heating/FS>
If a) and b) occur, L7 is displayed;
a) No change on THW1 (under 1 °C for 20
minutes from unit starts operation)
b) THW5B goes up in Heating (or FS)
mode. (over 1 °C for 20 minutes)
Exception
If simultaneous Heating and DHW operation
is selected error code will not be displayed.
2 THW1 or THW5B fault
3 FTC3 board failure
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual
operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
2 Check resistance of thermistor against table
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
3 Replace board.
The thermistor on the wireless remote controller or the main remote controller may be
defective.
4 Incorrect setting of the Dip switch(es)
4 Check the Dip switch setting(s)
5 THW1 or THW5B has been detached from 5 Visually inspect location and reattach as
its holder.
L8
necessary.
Heating operation error
1 THW1 has become detached from its
<Heating/FS>
holder.
If a), b) and c) occur, L8 is displayed;
a) N
o change on THW1 and THW5B
2 Booster heater fault
(under 1 °C for 20 minutes from unit starts
operation)
b) N
o change on THW1
3 THW1 or THW2 or THW5B fault
(under 1 °C for 10 minutes from booster
heater starts operation)
c) T
HW1 - THW2 < -5 °C
(for 10 minutes continuously)
4 FTC3 board failure
46
1 Visually inspect location and reattach as
necessary.
2 Electrically test to determine fault.
See 10-6. for how to check.
3 Check resistance of thermistor against table
in section 10-6.
Compare FTC3 detected temperature to
hand held detector.
4 Replace board.
Error code
Title and display conditions
L9
Low primary circuit flow rate detected by
flow switch
<DHW/Heating/LP/FS>
Error code displayed when flow switch
detects low flow rate for 10 seconds.
Exception
For 3 mins after water circulation pump1 is
switched on.
Possible Cause
1 Insufficient system head
Diagnosis and action
1 Refer to table in section 10-6. to determine
if system pump meets requirements.
If more head required either add an pump
of the same size or replace existing pump
with capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
Check valves on primary water circuit are
installed level.
Electrically test to determine fault.
2 Reduced flow in primary water circuit
2
3 Valve operation fault
3
4 2-way valve (field supply) actuator fault
5 Connector/terminal wire has become
4
5 Visually check the CN2F connector and IN2
6 Flow switch fault
6 Electrically test to determine fault.
7 FTC3 board failure
7 Replace board.
Due to 1 or more of the following;
Faulty pump, insufficient air purge, blocked
strainer, leak in water circuit.
detached or loose wiring.
terminal and reattach if necessary.
See 10-6. for how to check.
Incorrect setting of SW2-2.
E0/E4
Main controller communication failure
(Reception error)
Error code E0 is displayed if main controller
does not receive any signal from the indoor
unit for ref. address "0" for 3 mins.
Error code E4 is displayed if indoor unit
does not receive any data from the main
controller for 3 mins or indoor unit does not
receive any signal from the main controller
for 2 mins.
8 Incorrect setting of the SW2-2
1 Contact failure with transmission cable
2
3
4
5
E3/E5
Main controller communication failure
(Transmission error)
Error code E3 is displayed if the main
controller an not find an empty transmission
path and thus fails to transmit for 6 secs
or the data received bythe main controller
is different to what was sent (by the main
controller) 30 consecutive times.
1
connections at the FTC3 and main controller
terminals.
Wiring procedure not observed.
2 Check main controller and FTC3 common
(Cable length/cable diameter/number of
wiring max cable length 500 m.
indoor units/number of main controllers)
Only use 2 core cable.
Only connect 1 main controller to 1 FTC3
indoor unit board.
Fault on the indoor unit FTC3 board section 3 to 5
controlling Ref. address "0"
If the problem is not solved by the above
Fault with the main controller circuit board
measures then:
Turn the power to the indoor unit OFF and
Electrical noise causes interference with
then ON.
transmission/reception of data for main
Power to both the indoor unit and outdoor
controller.
units should be switched OFF then ON. (This
may require switching 1 or 2 breakers depending if the unit is powered independently
from the outdoor unit).
If the E4 code is still displayed the FTC3
and/or the main controller circuit board
should be replaced.
2 or more main controllers have been
1 Only connect 1 main controller to 1 FTC3
connected to the FTC3.
indoor unit board.
2 Fault with main controller transmission/
receiving circuit board
3 Fault with the main controller circuit board
4 Electrical noise causes interference with
transmission/reception of data for main
controller.
Error code E5 is displayed if the FTC3 can
not find an empty transmission path for 3
mins and thus cannot transmit or the data
sent by the FTC3 is different to what was
expected 30 consecutive times.
E6
Indoor/outdoor communication failure
(Reception error)
Error code E6 is displayed if after the power
is switched ON to the indoor unit, the FTC3
board does not receive any signal or the
signal receivedis not complete for 6 mins, or
after a period of operation the FTC3 board
does not receive any signal or the signal
received is not complete for 3 mins.
8 Check the SW2-2 setting.
1 Check connection cable for damage or loose
1 Contact failure/short circuit/miswiring
2 Fault with outdoor unit transmission/
receiving circuit board
3 Fault with FTC3 transmission/receiving
circuit board
4 Electrical noise causes interference with
FTC3-Outdoor unit transmission cable.
47
2 to 4
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E3/E5 code is still displayed the FTC3
and/or the main controller circuit board
should be replaced.
Check the LED display on the outdoor unit
circuit board.
(Connect the A-control service tool, PACSK52ST to test.) Refer to the outdoor unit service manual for explanation of EA-EC codes.
1 Check the connections on the indoor and
outdoor units have not become loose and
that the connecting cable is not damaged.
2 to 4
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E6 code is still displayed the FTC3
and/or the outdoor unit circuit board should
be replaced.
Error code
Title and display conditions
Possible Cause
E7
Indoor/outdoor communication failure
(Transmission error)
Error code E7 is displayed if despite the
FTC3 board sending signal "0", signal "1" is
received 30 consecutive times.
1 Fault with FTC3 transmission/receiving
circuit board
2 Electrical noise causes interference with
power supply.
3 Electrical noise causes interference with
FTC3-outdoor unit transmission cable.
1 to 3
Main controller control board failure
Error code E1 displayed if main controller
can not access it's non volatile (non power
dependent) memory.
Error code E2 is displayed when there is a
fault with the main controller's internal clock.
Indoor unit/wireless receiver communication failure
Error code J0 is displayed when the FTC3
can not receive data from the wireless receiver for 1 min.
1 Fault with the main controller circuit board
1 Replace main controller circuit board.
E1/E2
J0
FTC3 connection
2 Fault with FTC3 receiving circuit board
3 Fault with wireless receiver's transmission
circuit board
wireless receiver communication cable.
Wireless remote controller/wireless
receiver communication failure
(Reception error)
Error code displayed if wireless receiver
receives no/incomplete data from
the wireless remote controller for 15
consecutive minutes.
The digit after the J refers to the address of
the wireless remote controller that has the
error.
E.g. Error code "J3" refers to a
communication fault between the wireless
receiver and wireless remote control with
address 3.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E7 code is still displayed the FTC3 circuit board should be replaced.
1 Connection fault with wireless receiver- 1 Check the connections to the wireless re-
4 Electrical noise causes interference with
J1 to J8
Diagnosis and action
ceiver and FTC3 have not become loose and
that the connecting cable is not damaged.
2 to 4
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the J0 code is still displayed the FTC3 and/
or the wireless receiver circuit board should
be replaced. replaced.
1 Battery on wireless remote control may be 1 Check and replace the battery if necessary
flat
the wireless remote controller battery.
2 The wireless remote controller is out of
range of the wireless receiver.
3 Fault with wireless remote controller
transmission circuit board
4 Fault with wireless receiver's reception
circuit board
Note: To cancel error codes please switch system off (press button F4 (RESET) on main controller).
48
2 to 4
Reposition the wireless remote control closer
to the receiver and perform a communication
test.
For procedure refer to wireless remote
controller installation manual.
If "OK" is displayed then the cause of the J1 to
J8 error was the controller was out of range of
the receiver.
The wireless remote controller should be
installed within range of the receiver.
If "Err" is displayed replace wireless remote
controller with a new controller and perform
the pairing procedure.
If after this procedure the "Err" code is still
displayed the fault is with the receiver unit
(attached to the indoor unit).
The receiver unit should be replaced with a
new part and the original remote control can
be reconnected.
If "OK" is displayed then the fault is with the
remote control and this should be replaced.
10-5. Troubleshooting by inferior phenomena
No.
Fault symptom
Possible cause
1
Main controller display
does not work.
1. There is no power supply to main controller.
Explanation - Solution
2. Power is supplied to main controller,
however, the display on the main controller
is not visible.
1. "Please Wait" is displayed for up to 6 mins.
2. Communication failure between the main
controller and FTC3.
3. Communication failure between FTC3 and
outdoor unit.
2
“Please Wait” remains
displayed on the main
controller.
3
When pressing the
"ON" button, the main
screen is shown briefly
then disappears.
If whilst changing the settings in the service
menu, the system is shut down.
When you return to the main screen you may have
to wait a short while before the "ON" button will work.
4
LED2 on FTC3 is off.
When LED1 on FTC3 is also off.
<FTC3 powered via outdoor unit.>
1. Power supply of rated voltage is not supplied
to outdoor unit.
2. Defective outdoor controller circuit board.
3. Power supply of AC 220~240V is not
supplied to FTC3.
4. Defective FTC3.
5. There are problems in the method of
connecting the connectors.
1.
Check LED2 on FTC3.
(i) When LED2 is lit.
Check the main controller wiring for damage or contact failure.
(ii) When LED2 is blinking.
Refer to No.5 below.
(iii) When LED2 is not lit.
Refer to No.4 below.
Check the following.
2.
• Failure of main controller if “ Please Wait” is not displayed.
• Refer to No.2 below if “Please Wait” is displayed.
1.
Normal operation.
2, 3. Main controller start up checks/procedure.
(i) If main controller - FTC3 can not communicate the number displayed
under "Please Wait" is 0%, or 50-99%.
• Check wiring connections on main controller
• Replace main controller or FTC3 boards.
(ii) If 1-49% is displayed there is a communication errorbetween the outdoor
unit's and FTC3's boards.
• Check the wiring connections on the outdoor unit and FTC3 boards.
(Ensure S1, S2 are not cross wired and S3 is securely connected and not
damaged.)
• Replace the outdoor unit's and/or the FTC3's boards.
Normal operation.
The unit is processing the recent service menu changes and will be operational
shortly.
1. Check the voltage of outdoor power supply terminal block (L,N) or (L3,N).
• When AC220~240V is not detected, check the power wiring to outdoor
unit and the breaker.
• When AC 220~240V is detected, check 2 (below).
2. Check the voltage between outdoor terminal block S1 and S2.
• When AC 220~240V is not detected, check the fuse on outdoor controller
circuit board, check the wiring connection.
• When AC 220~240V is detected, check 3 (below).
3. Check the voltage between indoor terminal block S1 and S2.
• When AC 220~240V is not detected, check FTC3/outdoor unit connecting
wire for miswiring.
• When AC 220~240V is detected, check 4 (below).
4. Check the fuse on FTC3.
• Check the wiring conection.
If no problems are found, FTC3 board is defective.
5. Check that there is no problem in the method of connecting the connectors.
• When there are problems in the method of connecting the connectors,
connect the connector correctly referring to below.
BLACK
BLACK
S1
YELLOW
YELLOW
L
FTC3 powered
via outdoor unit.
CNO1
N
S2
Black
CNO1
Cylinder unit
control board
S3
<FTC3 powered from independent source>
1. Power supply of AC 220~240V is not
supplied to FTC3.
1. Check the voltage of indoor power supply terminal block (L,N).
• When AC220~240V is not detected, check the power supply wiring.
• When AC220~240V is detected, check 2 (below).
2.
2. There are problems in the method of
connecting the connectors.
Check that there is no problem in the method of connecting the connectors.
• When there are problems in the method of connecting the connectors,
connect the connector correctly referring to below.
S1
S2
CNO1
FTC3 powered
from independednt
source.
BLACK YELLOW
YELLOW BLACK
L
N
Black
CNO1
Cylinder unit
control board
S3
• When there is no problem in the method of connecting the connectors,
check 3 (below).
3. Defective FTC3.
When LED1 on FTC3 is lit.
Miss-setting of refrigerant address for
outdoor unit.
(None of the refrigerant address is set to "0".)
49
3. Check the fuse on FTC3.
• Check the wiring connection.
If no problems are found, FTC3 board is defective.
Recheck the refrigerant address setting on the outdoor unit.
Set the refrigerant address to “0”.
(Set refrigerant address using SW1(3~6) on outdoor controller circuit board.)
No.
Fault symptom
Possible cause
5
LED2 on FTC3 is blinking.
When LED1 on FTC3 is also blinking.
Connection failure of FTC3/outdoor unit
connecting wire
When LED1 on FTC3 is lit.
1. Miswiring of main controller wires
Multiple indoor units have been wired to 1
outdoor unit.
2. Miss-setting of refrigerant address for
outdoor unit
(Outdoor unit refrigerant address should be
set to "0")
3. Short-circuit of main controller wires
4. Defective main controller
6
No water at hot tap.
7
Cold water at tap.
8
9
It takes long for water
to heat.
Water in tank is not
used, but the water
temperature of the tank
decreases.
1.
2.
1.
2.
Hot or warm water from
cold tap.
1.
2.
1.
2.
1.
2.
5. Booster heater breaker (ECB1) has tripped.
6. The booster heater thermal cut-out has
operated and can not be reset using the
manual reset button.
7. Immersion heater cut out has triggered.
5.
6.
8. Immersion heater breaker (ECB2) has tripped.
9. 3-way valve fault
8.
9.
1. Heat pump not working.
2. Booster heater cut out has triggered.
1.
2.
3. Booster heater breaker (ECB1) has tripped.
4. The booster heater thermal cut-out has
operated and can not be reset using the
manual reset button.
5. Immersion heater cut out has triggered.
3.
4.
6. Immersion heater breaker (ECB2) has tripped.
The water temperature decreases to a certain
degree as the tank heat radiates when DHW
or Heating operation is not running. If the
temperature decreases excessively and
reheating occurs frequently, check for the
following.
1. Water leakage through the pipes that
connect to the tank
6.
Peeling off of insulation
3-way valve fault
If tap runs cold after a minute or so the pipe is
picking up heat from heating pipe work.
Check the connection of main controller wires.
Only 1 indoor unit should be wired to 1 outdoor unit.
Supplementary indoor units should each be wired to a separate outdoor unit.
Recheck the refrigerant address setting on the outdoor unit.
Set the refrigerant address to “0”.
(Set refrigerant address using SW1(3~6) on outdoor controller
circuit board.)
3, 4.
Cold main off
Strainer (field supply) blocked.
All hot water used.
Prohibit, schedule timer or holiday mode
selected.
3. Heat pump not working.
4. Booster heater cut out has triggered.
2.
3.
10
Explanation - Solution
Check FTC3/outdoor unit connecting wire for connection failure.
3.
4.
7.
5.
Remove main controller wires and check LED2 on FTC3.
• If LED2 is blinking check the main controller wires are not short circuiting.
• If LED2 is lit, connect main controller wires again and:
- if LED2 is blinking, main controller is defective;
- if LED2 is lit, connection failure of main controller terminal block etc. has
returned to normal.
Check and open stop cock.
Isolate water supply and clean strainer.
Ensure DHW mode is operating and wait for tank to re-heat.
Check settings and change as appropriate.
Check heat pump – consult outdoor unit service manual.
Check booster heater thermostat and press reset button if safe.
Reset button is covered with white rubber cap see component parts diagram
section 10-6. for position.
Check the cause of the trip and reset if safe.
Check the resistance of the thermal cut out, if open then the connection is
broken and the booster heater will have to be replaced.
Please contact your Mitsubishi Electric dealer.
Check immersion heater thermostat and press reset button,
located on immersion heater boss, if safe. If the heater has been operated
with no water inside it may have failed, so please replace it with a new one.
Check the cause of the trip and reset if safe.
Check plumbing/wiring to 3-way valve.
(i) Operate 3-way valve manually using the main remote controller. (Refer to
<Manual operation> in 9.2).
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve. (Refer to Procedure 6 in “11. DISASSEMBLY
PROCEDURE.”
Check heat pump – consult outdoor unit service manual.
Check booster heater thermostat and press reset button if safe.
Reset button is covered with white rubber cap see component parts diagram
section 10-6. for position.
Check the cause of the trip and reset if safe.
Check the resistance of the thermal cut out, if open then the connection is
broken and the booster heater will have to be replaced.
Please contact your Mitsubishi Electric dealer.
Check immersion heater thermostat and press reset button,
located on immersion heater boss, if safe. If the heater has been operated
with no water inside it may have failed, so please replace it with a new one.
Check the cause of the trip and reset if safe.
Take the following measures.
• Retighten the nuts holding the pipes onto the tank.
• Replace seal materials.
• Replace the pipes.
2.
Reattach insulation.
3.
Check plumbing/wiring to 3-way valve.
(i) Operate 3-way valve manually using the main remote controller. (Refer to
<Manual operation> in 9.2).
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve. (Refer to Procedure 6 in “11. DISASSEMBLY
PROCEDURE.”
Insulate/re-route pipe work.
1.
50
No.
12
Fault symptom
Heating system does
not get up to set temperature.
13
After DHW operation
room temperature
rises a little.
14
The room temperature
rises during DHW
operation.
15
Water discharges from
pressure relief valve.
(Primary circuit)
16
Water discharges from
pressure relief valve.
(Sanitary circuit)
17
Water discharges
from temperature and
pressure relief valve
(EHPT20X-VM2HA
only) (Sanitary circuit)
Possible cause
Explanation - Solution
1. Prohibit, schedule timer or holiday mode selected.
2. Check settings and change as appropriate.
3. The room in which the temperature sensor is located is at
a different temperature to the rest of the house.
4. Heat pump not working.
5. Booster heater cut out has triggered.
1. Check settings and change as appropriate.
2. Check the battery power and replace if flat.
3. Reposition the temperature sensor to a more suitable room.
4. Unit is being back pressurised.
4. With cylinder cold, check pressure in cylinder. If this is the
same as the incoming mains pressure then you are getting
back feed. Install a balanced cold supply.
1. If continual – field supplied pressure reducing valve not working.
1. Check function of pressure reducing valve and replace if
necessary.
2. Remove cartridge – check seat and renew if necessary.
3. Check pressure in expansion vessel.
Recharge to correct precharge pressure if necessary.
If bladder perished replace vessel.
4. With cylinder cold, check pressure in cylinder. If this is the
same as the incoming mains pressure then you are getting
back feed. Install a balanced cold supply.
5. Switch off power to the heat pump and immersion heaters.
Leave water supply on.
Wait until discharge stops. Isolate water supply and replace if
faulty.
Use manual and automatic air vents to remove air from system.
Top up water if necessary to achieve 1bar on primary circuit.
Install extra pipe fastening clips.
4. Check heat pump – consult outdoor unit service manual.
5. Check booster heater thermostat and press reset button if
safe.
Reset button is covered with white rubber cap see component
parts diagram section 10-6. for position.
6. Booster heater breaker (ECB1) has tripped.
6. Check the cause of the trip and reset if safe.
7. The booster heater thermal cut-out has operated and can 7. Check the resistance of the thermal cut out, if 0 then the
not be reset using the manual reset button.
connection is broken and the booster heater will have to be
replaced.
Please contact your Mitsubishi Electric dealer.
8. Incorrectly sized heat emitter.
8. Check the heat emitter surface area is adequate
Increase size if necessary.
9. 3-way valve fault
9. Check plumbing/wiring to 3-way valve.
(i) Operate 3-way valve manually using the main remote controller. (Refer to <Manual operation> in 9.2).
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve. (Refer to Procedure 6 in “11. DISASSEMBLY PROCEDURE.”
10. Battery problem *wireless control only
10. Check the battery power and replace it flat.
At the end of the DHW mode operation the 3-way valve diverts hot Normal operation no action necessary.
water away from the cylinder into space heating circuit.
This is done to prevent the cylinder unit components from overheating.
The amount of hot water directed into the space heating circuit
is dependent on the type of system and the pipe run between
the plate heat exchanger and the cylinder unit.
3-way valve fault
Check the 3-way valve.
(i) O perate 3-way valve manually using the main remote
controller. (Refer to <Manual operation> in 9.2.)
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve.
(Refer to Procedure 6 in “11. DISASSEMBLY
PROCEDURE.”)
1. If continual – pressure relief valve seat may be damaged.
1. Remove cartridge – check seat and renew if necessary.
2. Check pressure in expansion vessel.
2. If intermittent – expansion vessel charge may have
reduced/bladder perished.
Recharge to 1 bar if necessary.
If bladder perished replace vessel.
1. If continual – field supplied pressure reducing valve not working. 1. Check function of pressure reducing valve and replace if
necessary.
2. If continual – pressure relief valve seat may be damaged.
2. Remove cartridge – check seat and renew if necessary.
3. Check pressure in expansion vessel.
Recharge to correct precharge pressure if necessary.
3. If intermittent – expansion vessel charge may have
If bladder perished replace vessel.
reduced/bladder perished.
2. If continual – pressure relief valve seat may be damaged.
3. If intermittent – expansion vessel charge may have
reduced/bladder perished.
4. Unit is being back pressurised.
5. Unit has overheated – thermal controls have failed.
18
Noisy pump
Air in pump.
19
Noise during hot water
draw off typically
worse in the morning.
Mechanical noise
heard coming from the
cylinder unit.
Pump runs for a short
time for no reason.
Milky/Cloudy water
(Sanitary circuit)
Loose airing cupboard pipework.
Heaters switching on/off.
20
21
22
1.
2.
Heaters switching on/off.
3-way valve changing position between DHW and heating mode.
Normal operation no action necessary.
Pump jam prevention mechanism to inhibit the build up of scale.
Normal operation no action necessary.
Oxygenated water
Water from any pressurised system will release oxygen bubbles
when flowing. The bubbles will settle out.
51
No.
Fault symptom
Possible cause
Explanation - Solution
23 Heating mode has been
on standby for a long
time (does not start
operation smoothly.)
Duration is set to excessively short time at “Economy setting for
pump”. (Go to “Service menu” → “Auxiliary setting” → “Economy
setting for pump”).
Set “Economy setting for pump” longer.
24 Heating emitter is hot
in the DHW mode.
(The room temperature
rises.)
The 3-way valve may have foreign objects in it, or hot water
may flow to the heating side due to malfunctions.
Manually override the 3-way valve several times to check whether
the problem will be solved. (Refer to the service manual.) If the
problem persists replace the 3-way valve coil with a new one. If
still no change replace the entire 3-way valve with a new one.
25 The cylinder unit that
was running in the
heating mode before
power failure is running
in the DHW mode after
power recovery.
The cylinder unit is designed to run in an operation mode with a
higher priority (i.e. DHW mode in this case) at power recovery.
• Normal operation.
• After the DHW max. operation time has elapsed or the DHW
max. temperature has been reached, the DHW mode switches
to the other mode (ex. Heating mode).
10-6. Checking Component Parts' Function
Part Name
Check Points
Measure the resistance between the terminals with a tester.
(Winding temperate 20 °C)
Water circulation pump
Terminal
L-N
L
Normal
121Ω
Abnormal
Open or Short
N
M
1~
External static pressure
[kPa]
<Water circulation pump characteristics>
80
70
60
50
40
30
20
10
0
Speed3
(Default setting)
Speed1
0
10
Speed2
20
30
Flow rate [L/min]
40
<Recommended water flow rate range>
Outdoor heat pump unit
Packaged
PUHZ-W50
PUHZ-W85
PUHZ-HW112
PUHZ-HW140
Split
PUHZ-RP35
PUHZ-RP50
PUHZ-RP60
PUHZ-(H)RP71
PUHZ-(H)RP100
PUHZ-(H)RP125
PUHZ-RP140
Water flow rate range [L/min]
7.1 - 14.3
10.0 - 25.8
14.4 - 27.7
17.9 - 27.7
7.1 - 11.8
7.1 - 17.2
8.6 - 20.1
10.2 - 22.9
14.4 - 27.7
17.9 - 27.7
20.1 - 27.7
* If the water flow rate is less than 7.1 L/min, the flow switch will be activated.
If the water flow rate exceeds 27.7 L/min, the flow speed will be greater than
1.5 m/s, which could corrode the pipes.
Immersion heater
Measure the resistance between the terminals with a tester.
(Winding temperate 20°C)
Terminal
A-B
Normal
19.2 Ω
Abnormal
Open or Short
To reset the immersion heater use a pin or similar to press the reset button
located on the top of the immersion boss.
See diagram on the left.
52
Part Name
Check Points
Measure the resistance between the terminals with a tester.
Booster heater
Thermostat (90 °C) and thermal cut out (121 °C)
90 °C
Manual reset
water
thermostat
121 °C
Thermal
cut-out
Normal
110(±35)mΩ
Abnormal
Open or Short
Terminal
1-2
Normal
26.5(+3/-1.3)Ω
Abnormal
Open or Short
Terminal
1-2
3-4
Normal
26.5(+3/-1.3)Ω
13.3(+1.5/-0.6)Ω
Abnormal
Open or Short
Open or Short
Terminal
1-2=2-3=1-3
4-5=5-6=4-6
Normal
105.8(+11.8/-5)Ω
52.9(+5.8/-2.5)Ω
Abnormal
Open or Short
Open or Short
AWG18
AWG18
Terminal
9-10
9
10
2kW heater (230V, 1 phase)
AWG15 FEP
WHITE
AWG15 FEP
WHITE
2kW
2
1
2 + 4kW heater (230V, 1 phase)
2kW
2kW
AWG13 FEP
BLUE
AWG13 FEP
BLUE
AWG15 FEP
WHITE
AWG15 FEP
WHITE
2kW
3
4
1
2
3 + 6kW heater (400V, 3 phase)
1kW
2kW
4
5
2
3
If a short circuit occurs on the booster heater, immersion heater, or each power line, a short-circuit
breaker will trip and power source will be blocked.
Eliminate the causes of short circuit and then turn on the breaker again.
Earth leakage breaker for heater
Relay for heater
Flow switch
R
S
T
U
V
W
When the applied voltage is not 230V AC across the terminals A1-A2, check the terminals R-U,
S-V, and T-W are open.
When the applied voltage is 230V AC across the terminals A1-A2, check the terminals R-U, S-V,
and T-W are short.
A1 A2
1
2
Flow
3
Thermistors
AWG13 FEP
BLUE
AWG13 FEP
BLUE
AWG15 FEP
WHITE
1
6
1kW
AWG13 FEP
BLUE
1kW
2kW
AWG15 FEP
WHITE
AWG15 FEP
WHITE
2kW
Measure the resistance between the terminals with a tester.
State of moving part
Normal
Abnormal
Paddle vertical (Flow < 5.5 l/min)
Open
Other than open
Paddle inclined (Flow > 5.5 l/min)
Short
Other than short
Disconnect the connector then measure the resistance with a tester.
(At ambient temperatures of 10 - 30°C.)
Thermistor
TH1
TH2
THW1
THW2
THW5B
THW3
53
Normal
4.3 - 9.5 kΩ
160 - 410 kΩ
Abnormal
Open or short
<Thermistor Characteristics Charts>
• Room temperature thermistor (TH1)
• Liquid refrigerant temperature thermistor (TH2)
• Flow water temperature thermistor (THW1)
• Return water temperature thermistor (THW2)
• DHW tank temperature thermistor (THW5B)
50
Thermistor R0 = 15kΩ ± 3%
B constant = 3480 ± 2%
1
1
Rt = 15exp {3480 ( 273+t – 273 )}
Resistance (k)
0°C
10°C
20°C
25°C
30°C
40°C
40
15kΩ
9.6kΩ
6.3kΩ
5.2kΩ
4.3kΩ
3.0kΩ
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature ()
500
• Booster heater temperature thermistor (THW3)
400
20°C
30°C
40°C
50°C
60°C
250kΩ
160kΩ
104kΩ
70kΩ
48kΩ
70°C
80°C
90°C
100°C
110°C
Resistance (k)
Thermistor R120 = 7.465kΩ ± 2%
B constant = 4057 ± 2%
1
1
Rt = 7.465exp {4057( 273+t – 393)}
34kΩ
24kΩ
17.5kΩ
13.0kΩ
9.8kΩ
300
200
100
0
54
25
50
75
Temperature ()
100
120
10-7. Test point diagram
FTC3 (Controller board)
F3
6.3A/250V
F4
6.3A/250V
F2
6.3A/250V
CNP/OUT1 (TBO.1 1-2)
Water circulation pump1
(230V AC)
F1
6.3A/250V
CNV1/OUT4 (TBO.1 7-9)
3-way valve (7-8:230V AC)
OUT2 (TBO.1 3-4)
Water circulation pump2
(field supply)
(230V AC)
CN01
Power supply
(230V AC)
CN3C
Transmission
(Indoor/outdoor)
(0~24V DC)
CNBHT/BHT (TBO.2 1-2)
Thermostat input for
booster heater
CNBC/BC (TBO.2 3-4)
Signal output for booster
heater protection (230V AC)
OUT8 (TBO.2 9-10)
Signal output for booster
heater2+ (230V AC)
OUT11 (TBO.2 11-12)
Signal output (Error)
(230V AC)
VDD 5V
(DC5V ± 0.25V)
VDD 13V
(DC13V ± 0.6V)
CNIHT/IHT (TBO.3 1-2)
Thermostat input for
immersion heater
LED1
Power supply
(FTC3)
OUT12 (TBO.2 13-14)
Signal output (Defrost)
(230V AC)
LED3
Transmission
(Indoor/outdoor)
CNBH(5-7)/OUT7 (TBO.2 7-8)
Signal output for booster
heater2 (230V AC)
CNBH(1-3)/OUT6 (TBO.2 5-6)
Signal output for booster
heater1 (230V AC)
LED2
Power supply
(Main controller)
CNIH/OUT9 (TBO.3 5-6)
Signal output for immersion
heater (230V AC)
IN4
(TBI.2 13-14)
Heat source
OFF input
TH1/TH1 (TBI.1 1-2)
Thermistor
(Room temperature)
TH2/TH2 (TBI.1 3-4)
Thermistor
(Ref. liquid temperature)
THW12(3-4)/
THW2(TBI.1 7-8)
Thermistor
(Return water
temperature)
THW12(1-2)/
THW1(TBI.1 5-6)
Thermistor
(Flow water temperature)
THW3/
THW3(TBI.2 3-4)
Thermistor (Booster
heater temperature)
THW5(3-4)/
THW5B(TBI.1 11-12)
Thermistor
(Tank water temperature)
55
CN2F/IN2(TBI.2 7-8)
Flow switch input
IN1(TBI.2 5-6)
Room thermostat
input
CN22/RC(TBI.2 11-12)
Main controller
(10.4 - 13.7 V DC)
IN5
(TBI.3 7-8)
Outdoor thermostat
input
11
DISASSEMBLY PROCEDURE
<Preparation for the repair service>
● Prepare the proper tools.
● Prepare the proper protectors.
● Provide adequate ventilation.
● After stopping the operation of the cylinder and outdoor unit, turn off the power-supply breaker and remove the
power plug.
● Discharge the condenser before the work involving the electric parts.
● Allow parts to cool.
● Do not expose the electric parts to water.
● When replacing or servicing water circuit parts, drain system first.
EHST20C-VM6HA, EHST20C-YM9HA, EHST20C-VM6A, EHST20C-YM9A, EHST20C-VM6SA,
EHPT20X-VM2HA, EHPT20X-VM6HA, EHPT20X-YM9HA, EHPT20X-VM6A, EHPT20X-YM9A
Check individual illustrations and positions of the parts by referring to the parts catalog included in this manual.
Some lead wires and pipes are bundled with bands. Cut the bands to undo the fastened pipes and lead wires if necessary.
When bundling the lead wires and pipes again, use new commercially available bands.
When removing the parts associated with water pipe work, drain the cylinder unit as necessary .
When draining the cylinder unit, keep water from splashing on the internal parts (mainly electric parts and insulations).
PHOTOS & ILLUSTRATION
DISASSEMBLY PROCEDURE
1. How to remove the front panel
(1) R
emove the 2 painted screws at the bottom of the cylinder unit.
(Photo 1-1)
(2) Slightly lift and pull out the front panel from the cylinder unit. (Photo
1-1)
(3)Disconnect the relay connector connecting from the main
controller. (Photo 1-2)
Photo 1-1
Main controller
Front panel
Photo 1-2
Connector
Front panel fixing painted screws
2. How to remove the main controller
(1) Remove the front panel. (Refer to Procedure 1).
(2) Turn the front panel over and remove the 4 screws retaining the
controller support. (Photo 2-1)
(3) Remove the main controller from the case while moving up the
claw at the top of the case. (Figure 2-1)
Photo 2-1
Screws
Figure 2-1
56
Controller support
Front panel
PHOTOS
DISASSEMBLY PROCEDURE
3. How to remove the electrical parts
Photo 3-1
(Steps (1) through (3) are applied to all the following parts.)
Control box cover
fixing screws
<Control box cover> (Photo 3-1)
(1) Remove the front panel. (Refer to Procedure 1).
(2) Remove the 4 screws holding the control box cover.
(3) Slightly lift and pull out the control box cover.
<Earth leakage breaker> (Photo 3-2)
(4) Disconnect all the lead wires from the earth leakage
breaker.
(5) Remove the 2 screws on the earth leakage breaker.
Note:
To avoid dropping of the breaker, hold the breaker by
hand when removing the last screws.
Control box
cover
<Contactor> (Photo 3-2)
(4) Disconnect all the lead wires from the contactors.
(5) Remove the 2 screws on each contactor.
Note:
To avoid dropping of the contactors, hold the contactors by hand when removing the last screws.
Control box cover
fixing screws
Photo 3-2
Control box
<Terminal block> (Photo 3-2)
(4) Disconnect all the lead wires from the terminal block. (To
disconnect the S1, S2 and S3 lead wires, disengage the
locks by pressing on the claws.)
(5) Remove the screw on the terminal block.
Note:To avoid dropping of the terminal block, hold the
terminal block by hand when removing the screw .
Earth leakage breakers
(ECB1, ECB2)
Controller
board
CNBHT
connector
THW3
connector
Terminal block (TB1)
Contactors
w The photos shown are of the EHST20C-VM6HA model.
<Controller board> (Photo 3-3)
(4) Disconnect all the lead wires from the controller board.
(5) Remove the controller board from the 7 board supports.
Photo 3-3
Controller
board
57
PHOTOS
DISASSEMBLY PROCEDURE
4. How to remove the control box
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect only the lead wires in the control box that
connect to the components in the cylinder unit.
Photo 4-2 shows the control box after the related lead
wires are disconnected.
(4) Remove the 2 screws on the brackets (R) and disengage
the tabs on the 2 control box brackets from the right hand
frame. (Photo 4-1)
(5) Disengage the 2 tabs on the control box bracket (L) from
the left hand-side frame. (Photo 4-1)
(6) Slightly lift and pull out the control box from the cylinder
unit while tilting the control box backward.
Photo 4-1
Bracket (L)
CNP1 connector
Earth cable
Bracket
(R)
Bracket
tab
Cable
clamps
Cable
strap
Screws
Bracket
tab
<When swinging the control box to the front>
(3) Remove the 2 screws on the brackets (R) . (Photo 4-1)
(4) Remove the 2 cable straps (under the control box). (Photo
4-1)
(5) Disengage the 2 control box brackets (R) from the righthand side frame and pull the control box by lifting the
right- hand side to swing the control box. (Photo 4-3)
Bracket
(R)
Side
frame
Side
frame
CN2F connector
Note:
Disconnect the field wiring as necessary.
Cable straps
(under the control box)
w The photos shown are of the EHST20C-VM6HA
model.
Photo 4-2
Photo 4-3
Control box
Swing
58
PHOTOS
DISASSEMBLY PROCEDURE
5. How to remove water pump/ pump valve
Photo 5-1
<Water pump>
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNP1 connector on the controller board
and release the lead wire from the 3 cable clamps and
the 2 cable straps in the control box, and the 3 bands
and the 2 cable straps below the control box, and
disconnect the earth cable in the control box. (Photos 4-1
10-1, 10-2)
(4) Close (OFF) the 2 pump valves and remove the water
pump by removing the two 1-1/2" nuts using two
spanners: one to hold the pump and the other to turn the
individual nuts. (Photo 5-1)
w When either of the pump valve handles is stiff, remove
the individual handles and turn the individual stems 90
degree mainly by using a spanner. (Photo 5-2)
w When reinstalling the 1-1/2" nuts, use new 1-1/2"
gaskets. (Photo 5-4)
w Set the water pump in the orientation of the arrow
printed on the water pump and in the way that the
terminal box faces to the front.
<Pump valve>
(5) Remove the pump valves by removing the 1" nuts using
two spanners: one to hold each valve and the other to
turn each 1" nut.
w When reinstalling the 1" nuts, use new 1" gaskets.
(Photo 5-3)
w When either of the pump valve handles is stiff, remove
the individual handles and turn the individual stems 90
degree mainly by using a spanner. (Photo 5-2)
w When reinstalling the pump valves, face the individual
handles to the right-hand side of the valve as
specified.
Note: S
kip Steps (2) and (3) above when replacing the pump
valves only.
When replacing both the water pump and the pump
valves, skip Step (4) above.
Nut (1")
Gasket(1")
Pump valve
(upper)
Pump valve
handle (upper)
Nut (1-1/2")
Gasket(1-1/2")
Terminal
box
Water pump
Nut (1-1/2")
Pump valve
(lower)
Pump valve
handle (lower)
Gasket(1-1/2")
Nut (1")
Gasket(1")
Photo 5-2
Pump valve
(upper)
Stem
Photo 5-3
Gasket (1")
Photo 5-4
Gasket (1-1/2")
59
PHOTOS
DISASSEMBLY PROCEDURE
6. How to remove the 3-WAY VALVE / 3-WAY VALVE MOTOR
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box. (Refer to Procedure 4.)
(3) Remove the 3-way valve motor from the 3-way valve
while pressing the button on the back of the motor (viewed
from the front of the cylinder unit). (Photo 6-2)
w Press the button also when reinstalling the 3-way valve
motor.
Photo 6-1
B
Nut (1")
Gasket(1")
(4) Remove the 3-way valve by removing the three 1" nuts
in the order of the bottom, middle and top using two
spanners: one to hold the 3-way valve and the other to
turn each nut. (Photo 6-2)
w When reinstalling the 1" nuts, use new 1" gaskets.
A and B shown represent the bottom and the top
directions of the 3-way valve, respectively.
Nut (1")
Gasket(1")
Gasket(1")
Nut (1")
Note:
Before replacing the motor, be sure to power off the
cylinder unit.
Failure to do so may cause electric shock or cause the
3-way valve to malfunction.
A
3-way valve motor
3-way valve
Photo 6-2
Button
3-way valve
motor
3-way valve
Place to hold the 3-way valve with a spanner
60
DISASSEMBLY PROCEDURE
PHOTOS
7. How to remove the flow switch
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CN2F connector on the controller board.
(Photo 4-1)
(4) Release the lead wire from the 5 bands and 2 cable
straps. (Photos 10-1, 10-2)
(5) Close (OFF) the strainer valve handle (under).
(Photo 10-2)
wW
hen the valve handle is stiff, remove the handle and
turn the vertical stem 90 degree mainly by using a spanner. (Photo 5-2)
(6) Remove the flow switch by loosening the nut. (Photo 7-1)
w When reinstalling the flow switch, use a new O-ring.
(Photo 7-2)
Photo 7-1
Flow switch
Lead wire
Nut
Flow direction
Photo 7-2
Note:To ensure the correct functioning of the flow switch,
check the following when installing it:
▪ The flow switch paddle is set perpendicularly to the
water flow. (Photos 7-2)
▪ The lead wire of the flow switch points toward the lefthand. (Photo 7-1)
▪ The lead wire runs parallel to the water pipe.
(Figure 7-1)
O-Ring
Figure 7-1
Flow switch
Pipe
Flow
Lead wire
OK
Flow switch
Pipe
Flow
NG
Flow switch
Pipe
Flow
NG
61
Flow switch paddle
DISASSEMBLY PROCEDURE
8. How to remove the booster heater
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNBHT connector and the THW3
connector on the controller board, and the 4 booster
heater lead wires wired to the BHC1 and BHC2
contactors and release the lead wires from the 7 bands
and the 2 cable straps. (Photos 8-1, 10-1, 10-2)
w THW3 will be used later.
(4) Close (OFF) the pump valve (lower) to stop flow. (Photo
8-2)
(5) Remove the two 1" nuts. (Photo 8-3)
w When reinstalling the 1" nuts, use new 1" gaskets.
(6) Remove the flare nut using two spanners: one to hold
the flare joint and the other to turn the flare nut.
(Photo 8-3)
(7) Remove the two screws on the heater stay. Lift the
booster heater slightly and remove the booster heater
from the heater stay. (Photo 8-4)
(8) Remove the flare joint from the booster heater.
(Photo 8-3)
w When reinstalling the flare joint, use a new 3/8" gasket.
(9) Remove the drain cock from the booster heater.
(Photo 8-3)
w Replace the removed drain cock (primary circuit).
The reused drain cock could cause water leakage.
(10) Remove the THW3 thermistor from the booster heater.
(Refer to Procedure 20. )
PHOTOS
Photo 8-1
Control box
Earth leakage breakers
(ECB1, ECB2)
Controller
board
CNBHT
connector
THW3
connector
Terminal block (TB1)
Contactors
w The photos shown are of the EHST20C-VM6HA model.
Photo 8-2
Pump valve
handle (lower)
Pump valve
(lower)
Photo 8-4
Photo 8-3
Flare nut
Flare joint
Gasket (3/8")
Nut (1")
Gasket (1")
Screw
Booster
heater
Heater stay
Nut (1")
Screw
Gasket(1")
Drain cock
62
DISASSEMBLY PROCEDURE
PHOTOS
9. How to remove the thermostat/immersion heater
Photo 9-1
<Thermostat>
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Peel off the water-proof tapes on the plastic head of the
thermostat in order to reveal the thermostat terminals,
and disconnect the lead wires from the terminals.
(Photo 9-1)
w Use new commercially available water-proof tapes to
cover the terminals again.
(3) Pull out the thermostat.
<Immersion heater>
(4) Remove the tab cover and remove the back nut (1-3/4")
using the tool included with the immersion heater. (Photo
9-2)
(5) Pull out the immersion heater.
w When reinstalling the immersion heater, use a new
1-3/4" gasket.
Water-proof tapes
Photo 9-2
Note:When replacing the immersion heater only, skip Step (2)
and cut the band shown. (Photo 9-3)
After reinstalling the back nut with the tab cover onto
the tank, insert the immersion heater straight into the
tank through the back nut in order to provide adequate
sealing. Failure to do so may cause water leakage.
Always check for water leakage after installation.
Back nut
(1-3/4")
Tool (*2)
(*2) When the model is the cylinder unit including immersion heater,
the tool is included with the unit. The tool is also included with
the immersion heater of optional parts.
Photo 9-3
Back nut
Band
63
Lead wires
Thermostat/
Immersion heater
DISASSEMBLY PROCEDURE
PHOTOS
10. How to remove the plate heat exchanger
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Pump down the refrigerant circuit and close the
stop valve at the outdoor unit side. (Refer to 12.
SUPPLEMENTARY INFORMATION.)
(3) Remove the control box. (Refer to Procedure 4.)
(4) Cut the bands and remove the pump frame. (Photo 10-1)
(5) Cut the bands bundling the pipes. (Photos 10-2, 10-3)
(6) Remove the 2 flare nuts on the refrigerant piping on top
of the cylinder unit. (Photo 10-3)
(7) Close (OFF) the strainer valve handle (under).
w When the valve handle is stiff, remove the handle and
turn the vertical stem 90 degree mainly by using a
spanner. (Photo 5-2)
(8) Remove the 1" nut at the booster heater side of the
flexible hose. (Photo 10-2)
w When reinstalling the 1" nut, use a new 1" gasket.
(9) Remove the 1" nut under the strainer valve. (Photo 10-2)
w When reinstalling the 1" nut, use a new 1" gasket.
(10) Remove the 4 screws fixing the plate heat exchanger.
(Photo 10-2)
Photo 10-1
Pump frame
Bands
Screw
Screw
Cable straps
Photo 10-2
Bands
Screws
plate heat
exchanger
Flare nuts
strainer
valve
handle
(under)
Photo 10-3
strainer
valve
Gasket (1")
Top panel
Screws
Nut (1")
(under the strainer valve)
Bands
64
Band
Nut (1")
Band
Gasket (1")
DISASSEMBLY PROCEDURE
PHOTOS
10. How to remove the plate heat exchanger
(10) D
isplace the plate heat exchanger together with the
refrigerant pipes, the water pipe and the flexible hose to
the front of the cylinder unit while feeding the top ends
of the 2 refrigerant pipes though the openings in the
top panel and remove the heat exchanger unit from the
cylinder unit. (Photos 10-3, 10-4, 10-5)
(11) Loosen the 1" nut on the water pipe and remove the
water pipe form the plate heat exchanger.
w When reinstalling the nut, use a new 1" gasket.
w When reinstalling the plate heat exchanger, reuse the
water pipe.
Photo 10-5
Photo 10-4
Refrigerant pipes
Nut on the flexible hose
Nut on the water pipe (1")
Gasket (1")
Plate heat
exchanger
Flexible hose
Water pipe
Nut under the strainer valve
11. How to remove the strainer
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Close (OFF) the 2 strainer valves.
wWhen either of the strainer valve handles is stiff,
remove the individual handles and turn the individual
stems 90 degree mainly by using an adjustable
spanner. (Photo 5-2)
(3) Remove the two 1" nuts using two spanners: one to hold
the strainer and the other to turn the individual 1" nuts.
w When reinstalling the 1" nuts, use new 1" gaskets.
<Removal of the strainer cover (debris recovery)>
(3) Remove the cover using two spanners: one to hold the
strainer and the other to turn the cover.
wBe sure to reattach the mesh after washing it.
w When placing the strainer back into place, use a new
O-ring. (Photo11-2)
Nut (1")
Gasket(1")
Strainer valve handle
Strainer
Cover
Strainer valve handle
Nut (1")
Photo 11-2
Cover
Strainer mesh
Photo 11-1
O-ring
65
Gasket(1")
DISASSEMBLY PROCEDURE
PHOTOS
12. How to remove the pressure relief valve / manometer / air
vent (automatic)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
Photo 12-1
<Manometer>
(3) Remove the 2 screws on the manometer stay on top of
the cylinder unit. (Photo 12-1)
(4) Remove the 1/4" nut from the pressure relief valve and
remove the capillary tube from the pressure relief valve.
wWhen reinstalling the 1/4" nut, use a new 1/4" gasket.
(Photo 12-2)
(5) Remove the manometer assembly from the cylinder unit.
(6) Remove the manometer from the manometer stay while
pressing on the claws. (Photo 12-3)
w Beware not to put strain on the root of the capillary
tube as the capillary tube is easy to break at the root.
(Photo 12-3)
Manometer
stay
Screws
Photo 12-2
Pressure relief valve
Air vent
Manometer stay
<Pressure relief valve>
(3) Remove the field piping from the pressure relief valve.
(4) Remove the 1/4" nut and remove the capillary tube from
the pressure relief valve. (Photo 12-2)
wWhen reinstalling the 1/4" nut, use a new 1/4" gasket.
(Photo 12-2)
(5) Remove the pressure relief valve with a flare joint using
two spanners: the one to hold the flare joint and the other
to turn the flare nut under the top panel. (Photo 12-4)
(6) Remove the pressure relief valve using two spanners:
one to hold the adaptor and the other to turn the
pressure relief valve. (Photo 12-5)
(7) Eliminate locktite on the thread surfaces using remover.
(Photo 12-5)
wBefore reinstallation, apply locktite over the thread
surface on the pressure relief valve.
wFor more details about the locktite and the remover,
refer to Page 71.
Photo 12-5
Manometer
Nut (1/4")
Photo 12-3
Capillary tube
Pressure
relief valve
Gasket (1/4")
Claw
Root
Claw
Adaptor (3/8") Flare joint
Photo 12-4 (Under the top panel)
Flare nut for pressure
relief valve
Threads for application of loctite
Flare joint for pressure relief valve
Gasket (3/8")
<Air vent (automatic)>
(3) Remove the air vent (automatic) using two spanners: one to
hold the flare joint and the other to turn the flare nut under
the top panel. (Photos 12-2 and 12-4)
(4) Remove the air vent with the flare joint. (Photo 12-4 and
12-6)
(5) Remove the flare joint from the air vent. (Photo 12-6)
Photo 12-6
Flare joint
Tape
Air vent
Flare nut for air vent
Flare joint for air vent
66
DISASSEMBLY PROCEDURE
PHOTOS
13. How to remove the expansion vessel
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the flare nut using two spanners: one to hold the
flare joint and the other to turn the flare nut.
(4) Displace the pipe slightly downward and pull out the
expansion vessel.
(5) Remove the flare joint from the expansion vessel.
w When reinstalling the flare joint, use a new 3/8" gasket.
Note: To avoid dropping of the expansion vessel, hold it
by hand when removing it.
Photo 13-1
Expansion vessel
Flare joint
Flare nut
Pipe
Flare joint
Photo 13-2
Gasket (3/8")
14. How to remove the temperature and pressure (T&P)
relief valve (EHPT20X-VM2HA only)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the field piping from the temperature and
pressure relief valve.
(4) Turn the back nut (1-3/4") using a specified tool and remove
the temperature and pressure relief valve. (Photo 14-2)
(5) Eliminate locktite on the thread surfaces using remover.
(Photo 14-3)
w Before
reinstallation, apply locktite over the thread surface
on the temperature and pressure relief valve and install the
temperature and pressure relief valve with the T&P joint
and the back nut.
w When reinstalling the T&P relief valve, point the nut to the
bottom as specified. (Photo 14-1) w For more details about the locktite and the remover, refer
to Page 71.
w When reinstalling the T&P, use a new 1-3/4" gasket.
Photo 14-1
Photo 14-2
JIG (for back nut) (*2)
T&P relief valve
Nut
Back nut (1-3/4")
(*2) The JIG is set as a service part.
Photo 14-3
T&P joint
Back nut
T&P relief valve
Threads for application of loctite
15. How to remove the air vent (manual)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the air vent (manual) with a flare joint using two
spanners: one to hold the flare joint and the other to turn
the flare nut.
(3) Remove the flare joint from the air vent.
Photo 15-1
Flare joint
Air vent (manual)
67
Flare nut
PHOTOS
DISASSEMBLY PROCEDURE
Photo 16-1
16. How to remove the drain cock (primary circuit)
(1) Remove the front panel. (Refer to Procedure 1.)
Drain cock
(booster heater side)
Booster heater side
(2) Remove the drain cock from the booster heater by
turning the drain cock.
Pipe side
(2) Remove the drain cock from the pipe using two spanners:
one to hold the flare joint and the other to turn the flare
joint nut.
(3) Remove the flare joint from the drain cock.
Drain cock
(Pipe side)
17. How to remove the drain cock (sanitary circuit)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the drain cock by removing the nut.
w When reinstalling the nut, use a new 3/4" gasket.
Photo 17-1
Flare joint
Flare nut
Drain cock (sanitary circuit)
Nut (3/4")
Gasket
(3/4")
18. How to remove the flexible hose
Photo 18-1
Between the plate heat exchanger and the booster heater
(1) R
emove the plate heat exchanger from the cylinder unit.
(Refer to Procedure 10.)
(2) Remove the flexible hose from the plate heat exchanger
by removing the 1" nut. (Photo 18-2)
w When reinstalling the 1" nuts, use new 1" gaskets.
Flexible hose
Booster heater
Nut (1")
DHW tank side
(1) Remove the left-hand side panel.
(Refer to Procedure 21.)
(2) Disconnect the flexible hose by turning the nuts on the
hose ends.
w When reinstalling the nuts, use new 3/4" gaskets.
Gasket (1")
Photo 18-2
Photo 18-3
Nut (1")
Nut (3/4")
Gasket (3/4")
Flexible hose
Plate heat
exchanger
Gasket
(1")
Flexible hose
Gasket (3/4")
Plate heat exchanger
Nut (3/4")
(Side view)
68
PHOTOS
DISASSEMBLY PROCEDURE
19. Remove the liquid refrigerant temp. thermistor (TH2)
/ flow water temp. & return water temp. thermistor
(THW1,THW2) / tank water temp. thermistor (THW5B)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the following thermistor connectors on the
controller board and release the lead wires from cable
clamps and bands.
• TH2 (TH2) (1 cable clamp, 2 cable straps and 3 bands)
• THW1 (THW12) (1 cable clamp, 2 cable straps and 1 band)
• THW2 (THW12) (1 cable clamp, 2 cable straps and 2 bands)
• THW5B (THW5) (2 cable clamps, 2 cable straps and 4 bands)
(4) Remove the thermistors from the thermistor holders.
Photo 19-1
Thermistor <THW1>
Thermistor
<THW2>
Photo 19-2
Thermistor
<TH2>
Thermistor
connectors
<TH2>
<THW1>
<THW2>
<THW3>
<THW5B>
Thermistor <THW5B>
Cable
clamps
Cable straps
Bands
Band
69
PHOTOS
DISASSEMBLY PROCEDURE
20. How to remove the booster heater temp. thermistor
(THW3)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Remove the THW3 connector on the controller board.
(Photo 19-2)
(4) Cut the band bundling the THW3 cable.
(5) Run the thermistor cable out the bottom of the booster
heater and remove the THW3 thermistor.
Photo 20-1
Booster heater
Thermistor
<THW3>
<Booster heater>
THW3
cable
Band
21. How to remove the side panels
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the side panel by removing 12 screw fixing the
side panels (6 screws each on the right and left panels).
Note:
Photo 21-1 shows the right side panel only. The left side
panel will be removed by the same procedure.
Photo 21-1
Side panel (Right)
Screws
(Top panel)
Side panel (Left)
Screws
Screws
22. How to remove the back panel
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the side panels. (Refer to Procedure 21.)
(3) Remove the 4 screws (2 each at the front and back) on
the top panel .
(4) Remove the 2 screws on the back panel, and pull out the
back panel while lifting the top panel.
Photo 22-1
Screws (Top panel)
Top panel
Handles
Note:
The handles are removed by pushing them up.
Screws
(Back panel)
70
Notes on replacing the parts
Replacement of the parts listed below requires the following procedure.
After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified
tightening torques below. For details about recommended loctite and loctite remover, refer to Table 11-1, and for details about the replacement parts and
their tightening torques, refer to Table 11-2.
Table 11-1
Recommended
Manufacturer
No.
Note
Loctite
Henkel
Loctite 577
Apply loctite all over from the end of external thread to the second
ridge. After installing the parts, fix the parts for at least 30 minutes
Loctite remover
Henkel
Loctite 7200 Gasket Remover
Spray loctite remover over sealant on the threads, let the sealant
sit until soft, and then eliminate it with a wire brush.
Note: When using the products above, refer to the appropriate manuals that come with the individual products.
Table 11-2
PARTS CATALOG
Page
No.
Part No.
Recommended tightening
torque [Nm] *2
Part name *1
3, 5, 7, 9
1
S70 C18 404
PRESSURE RELIEF VALVE 3bar
15 ± 1
11
15
S70 C19 404
TEMPERATURE AND PRESSURE RELIEF VALVE
15 ± 1
11
8
S70 C11 525
STAT POCKET ASSEMBLY
12 ± 1
*1. For more details about the listed parts refer to the parts catalogue included in this manual.
*2. Undertightening and overtightening the parts affect water seal life. Tighten the parts to the appropriate tightening torques.
When installing the parts that are not listed above, observe the tightening torques in accordance with Table 11-3.
Always use a new O-ring or gasket.
Table 11-3
Size
[inch]
Gasket
O-ring
1/4"
Recommended tightening torque
[Nm]
8±1
3/8"
15 ± 1
3/4"
36 ± 2
1"
42 ± 2
1 1/2"
42 ± 2
1 3/4"
10 ± 1
Strainer cover
45 ± 4.5
Flow switch
Air vent (Automatic)
Drain cock (primary circuit)
Attached packing
Air vent (manual)
Flare joint (for water circuit parts)
8±1
15 ± 1
15 ± 1
15 ± 1
35 ± 2
After the procedure is complete, ensure that no water leaks.
71
12
SUPPLEMENTARY INFORMATION
Refrigerant recovery (pump down) for split systems only
For split system the following procedures should be followed to recover system refrigerant:
Note) Pump down operation can not be activated by switching the pump down switch (SWP) or test run switch on the outdoor unit PCB.
Ensure both the outdoor unit and the indoor unit are in emergency mode before carrying out the following.
For pump down operation in split systems both the indoor and the outdoor unit must be in emergency mode.
Please see the following instructions on how to activate emergency mode.
Before carrying out the pump down, ensure the water pump is functioning correctly and L9 error code is not displayed on the main controller.
If there is insufficient water circulation, the circuit may freeze causing damage to the plate HEX.
If there is a fault with the pump or L9 error code is displayed on the main controller, do not attempt pump down operation.
In this case a refrigerant recovery machine must be used.
1. Isolate outdoor unit from power supply by switching OFF relevant circuit breaker.
If the indoor unit is powered independently to the outdoor unit, ensure that both units are isolated from the power supply.
2. Fully close the stop valve on the refrigerant (liquid) pipe and attach the pressure gauge to the port on the low pressure side of the compressor refrigerant pipe work.
Change the position of the connector CN31 to ON and change DipSW4-2 to OFF on the outdoor unit PCB.
Change the DipSW4-5 on the indoor unit to ON.
3. Switch ON power to the outdoor unit.
If the indoor unit is powered independently, switch on power to the indoor unit first, then switch on power to the outdoor unit.
Outdoor and indoor unit will start operating in emergency mode.
Note) If the outdoor unit is operated whilst the indoor unit is switched off, this could cause serious damage to the plate HEX.
Always ensure the indoor unit power supply is ON and water pump is operating before switching ON power to the outdoor unit.
After reconnecting power supply, ensure the water pump is operating correctly.
If the water pump is not operating normally, then this could cause the water circuit to freeze damaging the plate HEX.
4. When the pressure gauge reads close to 0MPa (G), close the valve on the refrigerant (gas) pipe and then switch power to outdoor unit OFF.
If the indoor unit is powered independently ensure power supply for unit is OFF.
Note) It is important that after closing the valve on the refrigerant (gas) pipe the power supply is quickly switched OFF.
If the system is running at a pressure of 0MPa (G) or lower, it may cause damage to the compressor.
5. After completing the pump down operation, return the position of the connector CN31 on the outdoor unit PCB to OFF.
Change the Dip SW4-5 on the indoor unit to OFF.
72
13
SERVICE AND MAINTENANCE
Engineers form
The main controller settings changed from the default settings are reset by replacing the controller board. To facilitate reselecting settings on the main controller, it is
recommended to write down the changes in the sheet below before replacement.
Commissioning/Field settings record sheet
Parameters
Main
Setting
Option
Forced DHW operation
DHW
Heating
Holiday mode
DHW
Operation mode
DHW max. temp
DHW temperature drop
DHW max. operation time
DHW mode restriction
Legionella prevention
Active
Hot water temp
Frequency
Start time
Max. operation time
Duration of maximum temperature
Heating
Operation mode Heating
Heating room temp
Heating flow temp
Compensation Lo set point Outdoor ambient temp
curve
Flow temp
Hi set point Outdoor ambient temp
Flow Temp
Adjust
Outdoor Ambient Temp
Flow temp
Schedule timer
Active
Holiday
DHW
Heating
Heating room temp
Heating flow temp
Initial settings
Language
°C/°F
Temp display
Time display
Room sensor setting
Service menu
Manual operation
Thermistor adjustment
Auxiliary setting
Economy setting for
pump
Freeze stat function
Electric heater
(Heating)
Electric heater
(DHW)
Heat source setting
Operation setting Simultaneous
operation
Cold weather function
On/Off
On/Off/Timer
On/Off/Timer
Active/Non active/Set time
Normal/Eco
40°C – 60°C
5°C – 30°C
30 – 120 mins
30 – 120 mins
Yes/No
60°C – 70°C
1 – 30 days
00.00 – 23.00
1 – 5 hours
1 – 120 mins
Flow temp/Compensation curve/Room temp
10°C – 30°C
25°C – 60°C
-15°C – 35°C
25°C – 60°C
-15°C – 35°C
25°C – 60°C
-14°C – 34°C
25°C – 60°C
Yes/No
Active/Non active
Active/Non active
10°C – 30°C
25°C – 60°C
ENG/PT/NOR/FIN/NL/DA/IT/SP/SW/GER/FR
°C/°F
On/Off
hh:mm/hh:mm AM/AM hh:mm
TH1/Main RC/Room RC1-8/(Time/Zone)
Supplementary pump or 3 way valve On/Off
-10°C — +10°C
Active/Not active
Time before pump switched off (3 – 60 mins)*1
Outdoor ambient temperature (3 – 20°C)
Space heating: Used/Not Used
Electric heater delay timer (5 – 180 mins)
DHW: Used/Not Used
Electric heater delay timer (15 – 30 mins)
Standard/Heater
Active/Inactive
Outdoor ambient temperature (-15 – 10°C)
Active/Inactive
Outdoor ambient temperature (-15 – -10°C)
Room temp control Temperature control interval (10 – 60 mins)
(Heating)
Flow temperature range (Maximum temp.)
(35 – 60°C)
Flow temperature range (Minimum temp.)
(25 – 40°C)
*1 Decreasing “time before pump switched off” may increase the duration of stand-by in Heating mode.
73
Default
setting
Off
On
On
Non active
Normal
50°C
10°C
60 mins
30 mins
Yes
65°C
15 days
03.00
3 hours
30 min
Room temp
20°C
45°C
35°C
25°C
-15°C
50°C
—
—
No
Non active
Active
15°C
35°C
ENG
°C
Off
—
TH1
Off
0°C
Active
10 mins
5°C
Used
30 mins
Used
15 mins
Standard
Inactive
-15°C
Inactive
-15°C
10 mins
50°C
30°C
Field
setting
Notes
Annual Maintenance Log Book
Engineer name
Site number
Contractor name
Site name
Cylinder maintenance record sheet
Warranty number
No.
Mechanical
Turn OFF water supply, drain tank, remove mesh from strainer clean and
replace in strainer. *1
Keep water supply OFF, open hot water taps and check the expansion
2
vessel charge pressure. Top up if necessary (1 bar).
Turn water supply ON, open the pressure relief valve and then the
expansion valve in turn. Check for unrestricted discharge to the tundish
3
and that the valves reseat correctly. Check there are no blockages in the
tundish and associated pipe work.
4
In hard water areas de-scaling of the immersion heaters may be required.
Drop the primary/heating system pressure to zero check and if neces5
sary top up the expansion vessel (1 bar). Air valve of expansion vessel is
TR-412.
Check and if necessary top up the concentration of anti-freeze/inhibitor (if
6
used in the system).
Top up the primary/heating system using an appropriate filling loop and
7
re-pressurise to 1 bar.
Heat system and check pressure does not rise above 3 bar and no water
8
is released from the safety valves.
9
Release any air from the system.
To check the 3-way valve for inside leaks, confirm that the temperature of
10
the heat emitter does not rise when running the DHW mode.
Refrigerant SA models only
1
Refer to outdoor unit manual.
Electrical
1
Check condition of cables.
2
Check rating and fuse fitted on the electricity supply.
Controller
1
Check field settings against factory recommendations.
2
Check operation of motorized valves ensure they reseat correctly.
3
Check battery power of wireless thermostat and replace if necessary.
Outdoor heat pump unit maintenance record sheet
Model number
Mechanical
1
Inspect grill, heat exchanger fins air inlet for trapped debris/damage.
2
Check condensate drain provision.
3
Check integrity of water pipe work and insulation.
4
Check all electrical connections.
5
Check and record the operation voltage.
Model number
Serial number
Frequency
Notes
Frequency
Notes
Frequency
Notes
Frequency
Notes
Serial number
Frequency
Notes
1
* All the above checks should be carried out once a year.
*1. Be sure to reattach the mesh after washing.
Note:
Within the first couple of months of installation, remove and clean the strainer. This is especially important when installing on an existing system.
In addition to annual servicing it is necessary to replace or inspect some parts after a certain period of system operation. Please see tables below for detailed instructions. Replacement and inspection of parts should always be done by a competent person with relevant training and qualifications.
Parts which require regular replacement
Parts
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary circuit)
Flexible hose
Manometer
Inlet control group (ICG)*
Parts which require regular inspection
Replace every
Possible failures
Parts
Check every
Water leakage due to
brass/copper corrosion
(Dezincification)
Immersion heater
2 years
6 years
Pump
20,000 hrs (3 years)
Possible failures
Earth leakage causing
circuit breaker to activate
(Heater is always OFF)
Pump failure
Parts which must NOT be reused when servicing
* O-ring
* Gasket
* OPTIONAL PARTS for UK
Note:
Always replace the gasket for pump with a new one at each regular maintenance (every 20,000 hours of use or every 3 years).
74
75
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2011 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed inJul.2011 No. OCH507
Made in Japan
New publication, effective Jul. 2011
Specifications subject to change without notice