Mitsubishi Electric ACH1 User manual

0
Water Heating Unit Control Box
ACH1
FOR INSTALLERS
INSTALLATION MANUAL
For safe and orre t use, please read this installation manual thoroughly before installing the ACH1 ontrol box.

1
1 Thermistor x 3
2 ACH1 box
3 5 wire adapter
4 Installation manual
2
1 2
[Fig. 2.1]
3 4

2
A Thermistors (5K TC, R = 5K Beta = 3980 : at 25°C
B Mode select (require volt free inputs)
C 5 wire connector to C 52 on PQFY (1 = black)
D Immersion heater output
E Connection to TH1H on PQFY
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
TH1H
C 52
5 0v +
IH Drive
5v 10mA
T1 (DHW)
T2 (UFH)
T3 (UFC)
DHW SELECT
UFH SELECT
UFC SELECT
UFC
SET
10-20
DHW
SET
41-55
UFH
SET
30-45
A B
C D E
Set Switches
using BCD
encoding*
Switch ‘O ’
represents
‘8’
‘4’
‘2’
‘1’
Set value =
BCD
setting
+ 40°C**
Set value =
BCD
setting
+ 30°C
Set value =
BCD
setting
+ 10°C***
* See table 2.1 for more detailed explanation of BCD encoding
** All DHW switches FF gives 45°C with Immersion Heater Signal
*** UFC settings above 20 are treated as 20
[Fig. 5.1]

3
A Water pipe
B Thermistor
C Aluminium tape (field supply)
D Insulation
E Tie band
5
[Fig. 5.1.1]
A
B
C E
D

4
A PQFY water heater
B Centrifugal pump
C 3 way valve*
D Plate heat exchanger
E Immersion heater
F Water tank (Direct Cylinder)
T1 DHW thermistor [(a) or (b)]
B
A
B
C D
T1
(a)
(b)
[Fig. 5.1.2.1] E
F
B
A
D
C
T1
(b)
(a)
E
5
5
F
A PQFY water heater
B Centrifugal pump
C 3 way valve
D Internal cylinder heat
exchanger (coil)
E Immersion heater
F Water tank (Indirect Cylinder)
T1 DHW thermistor [(a) or (b)]
*Only needed if using under floor system
*Only needed if using under floor system
[Fig. 5.1.2.2]

5
A PQFY water heater
B Centrifugal pump
C 3 way valve*
D Under floor heating/cooling
pipe work
T2 UFH thermistor
B
T2
A
D
C
[Fig. 5.1.3]
B
T3
A
D
C
A PQFY water heater
B Centrifugal pump
C 3 way valve*
D Under floor heating/cooling
pipe work
T3 UFC thermistor
5
[Fig. 5.1.4]
*Only needed if using with domestic hot water
*Only needed if using with domestic hot water
5

6
A
C
D
E
F
B
DHW
SET
UFH
SET
UFC
SET
5
J
I L
K
H
G
A Thermistor
B Water pipe/cylinder (see fig 5.3… to see where to attach to)
C Thermistors
D Volt free contacts
E Dip switches (temperature set)
F ACH1 box
G Water pipe/cylinder (see B)
H 5 wire adapter (plug attaches to C 52 on PQFY)
I TH1H connection (attach to ‘inlet air’ TH1H on PQFY)
J PQFY water heater unit
K Immersion heater
L Water tank
[Fig. 5.2]

7
[Fig. 6.1]
1 = O
0 = OFF
* ote: DHW [0000] (all OFF) causes heat pump boiler to heat to 45°C, followed by signal for immersion heater to 60°C
Binary DHW temperature
(°C)
UFH temperature
(°C)
UFC temperature
(°C)
0000 45* 30 10
0001 41 31 11
0010 42 32 12
0011 43 33 13
0100 44 34 14
0101 45 35 15
0110 46 36 16
0111 47 37 17
1000 48 38 18
1001 49 39 19
1010 50 40 20
1011 51 41 20
1100 52 42 20
1101 53 43 20
1110 54 44 20
1111 55 45 20
6

8
Contents
1. Safety precautions.............................................................................................................................................................................8
1.1. Before installation and electric work.................................................................................................................................................8
1.3. Before installation ...........................................................................................................................................................................9
2. Accessories............................................................................................................................................................................................9
3. System components........................................................................................................................................................................10
4. Selecting an installation site ............................................................................................................................................................10
5. Electrical wiring ...............................................................................................................................................................................10
5.1. Connecting the thermistor cables....................................................................................................................................................10
5.1.2 Connecting the Domestic Hot Water (DHW) thermistor T1......................................................................................................11
5.3.3 Connecting the Under Floor Heating (UFH) thermistor T2.......................................................................................................11
5.3.4 Connecting the Under Floor Cooling (UFC) thermistor T3.......................................................................................................11
5.2. Connecting to the PQFY unit.........................................................................................................................................................12
5.3. Connecting the Immersion Signal..................................................................................................................................................12
5.4. Connecting the Mode Select .........................................................................................................................................................12
6. Setting up the Unit and Unit Logic ........................................................................................................................................................13
7. Initial setting and test run......................................................................................................................................................................14
1. Safety pre autions
1.1. Before installation and electric work
Symbols used in the text
Warning:
Des ribes pre autions that should be observed to prevent danger of injur y or death to the user.
Caution:
Des ribes pre autions that should be observed to prevent damage to the unit.
Warning:
• Ask the dealer or an authorised te hni ian to install the ontroller.
- Improper installation by the user may result in water leakage, electric shock, or fire.
• Use the spe ified ables for wiring. Make the onne tions se ur ely so that the outside for e of the able is not applied to the
terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
• Never repair the unit. If the ontroller must be repaired, onsult the dealer.
- If the unit is repaired improperly, electric shock, or fire may result.
• Install the ontroller a ording to this Installation Manual.
- If the unit is installed improperly, electric shock, or fire may result.
• Have all ele tri work done by a li ensed ele tri ian a ording to "Ele tri Fa ility E ngineering Standard" and "Interior Wire
Regulations" and the instru tions given in this manual and always use a spe ial ir ui t.
- If the power source capacity is inadequate or electric work is performed improperly, electric shock or fire may result.
• Keep the ele tri parts away from water (washing water et .).
- It might result in electric shock, fire or smoke.
• When moving and reinstalling the ACH1 unit, onsult the dealer or an authorised te hni ian.
- If the controller is installed improperly, electric shock, or fire may result.
• To dispose of this produ t, onsult your dealer.
Warning:
Carefully read the labels affixed to the main unit.
 Before installing the unit, make sure you read all the “Safety
pre autions”.
 The “Safety pre autions” provide very important points regarding
safety. Make sure you follow them.

9
1.3. Before installation
Caution:
• Do not install the unit where ombustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion may result.
• Do not use the ontrol box where food, pets, plants, pre ision instruments, or artwork are kept.
• Do not use the ontrol box in spe ial environments.
- Oil, steam, sulphuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its parts.
1.3.1. Before installation - ele tri al work
Caution:
• Do not wash the ontrol box.
- Washing them may cause an electric shock.
• Be very areful about produ t transportation.
• Safely dispose of the pa king materials.
- Packing materials, such as nails and other metal or wooden parts, may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children will not play with them - If children play with a plastic bag which has not
been torn apart, they face the risk of suffocation.
1.3.2. Before starting the test run
Caution:
• Do not tou h the swit hes with wet fingers.
- Touching a switch with wet fingers can cause electric shock.
• Do not operate the ontrol box with the panels and guards removed.
• Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise problems may occur.
.
2. A essories
The unit is provided with the following accessories:
[Fig. 2.1]
No A essories No supplied
1 Thermistor 3
2 5 wire adapter 1
3 ACH1 1

10
3. System omponents
• ACH1 Control box
• PQFY water heating unit
• Outdoor unit (any type)
• DHW thermistor
• UFH thermistor
• UFC thermistor
• 5 wire adapter
4. Sele ting an installation site
• Avoid locations in direct sunlight.
• Avoid locations exposed to stream or oil vapour.
• Avoid locations where combustible gas may leak, settle or be generated.
• Avoid installation near machines emitting high-frequency waves.
• Avoid places where acidic solutions are frequently handled.
• Avoid places where sulphur-based or other sprays are frequently used.
5. Ele tri al wiring
Pre autions on ele tri al wiring
Warning:
Ele tri al work should be done by qualified ele tri al engineers in a ordan e with "Engineering
Standards for Ele tri al Installation" and supplied installation manuals. Spe ial ir uits should also be
used. If the power ir uit la ks apa ity or has an installation failure, it may ause a risk of ele tri
sho k or fire.
• Install the unit to prevent any of the control circuit cables (remote controller, transmission cables) from direct contact with the power cable
outside the unit.
• Ensure that there is no slack on all wire connections.
• Some cables (power, remote controller, transmission cables) above the ceiling may be prone to be bitten by mice. Insert the cables into
metal pipes for protection.
• ever connect the power cable to leads for the transmission cables. Otherwise the cables could be broken.
Types of ontrol ables
Wiring transmission ables
• Types of transmission cables
Design wiring in accordance with the following table
• Cable diameter
More than 1.25 mm2
5.1. Connecting the thermistor cables
The ACH1 ontrol box is required for the Heat Pump Boiler (PQFY) to swit h between domesti hot water and under floor piping heating and
ooling modes. The extra interfa e, i.e., the ACH1 ontrol box is ne essary be ause when operating in heating, a different temperature must be
monitored often from a different position than when the system is operating in ooling. Thermistor ables (T1, T2, and T3) are atta hed to ‘A’
terminals [See figure 5.1]. Thermistors are atta hed to pipe/ ylinder [see figure 5.1.1]. For further details on setting up the unit and the unit logi ,
see se tion 6.
Caution:
Do not route the thermistor cables together with power cables.
Caution:
When the lead wire is too long, cut it to the appropriate length. Do not bind it in the box.
Caution:
Take proper measures not to miswire.

11
5.1.2 Conne ting the Domesti Hot Water (DHW) thermistor T1
Dire t ylinder with plate heat ex hanger
[Fig 5.1.2.1]
The thermistor an be atta hed to different parts of the system depending on the set up and the availability of onne tion points.
Note1: Thermistor (T1) attached to terminals 1 & on ACH1 unit [Fig 5.1].
Note : If the water heated from the HPB at 45°C is in a separate tank to the immersion heater taking the water temperature up to 60°C, the 45°C
water must be kept circulating to maintain legionella control.
• Type (a) – T1 attached to cylinder
o Set temperature to no more than 45°C (0101).
o Immersion function available – set temperature to 45°C (0000 – all OFF).
o When 44°C is achieved on T1, the immersion signal comes on and heats to 60°C. For more information see Unit Logic [se tion 6]*.
• Type (b) - T1 attached to inlet to the plate heat exchanger (cylinder water outlet)
o Set temperature to no more than 45°C (0101).
o o immersion heater function available.
Indire t Cylinder
[Fig 5.1.2.2]
The thermistor an be atta hed to different parts of the system depending on the set up and the availability of onne tion points.
Note: Thermistor (T1) attached to terminals 1 & on ACH1 unit [Fig 5.1].
• Type (a) – T1 attached to cylinder
o Set temperature to no more than 45°C (0101).
o Immersion function available – set temperature to 45°C (0000 – all OFF).
o *See as above.
• Type (b) - T1 attached to inlet to cylinder pipe (PQFY water outlet)
o Set temperature to 53°C (1101) on ACH1.
 In order to increase the output temperature of the water it is necessary to increase the condensing temperature of the
Heat Pump. This is achieved by setting a Dip Switch as follows.
• PUMY-P100/125/140YMH, PUMY-P100/125/140VMH, SW 6-6 to the O position.
• All City Multi P200 and above, SW3-7 to the O position.
o NLY USE WHEN TANK SURFACE IS INACCESSABLE.
o o immersion heater function available.
5.3.3 Conne ting the Under Floor Heating (UFH) thermistor T2
[Fig 5.1.3]
Note: thermistor (T ) attached to terminals 3 and 4 on ACH1 unit [Fig 5.1].
• T2 attached to water inlet to PQFY (return from under floor system)
o Set temperature to desired return temperature from under floor system.
o i.e. 35°C (0101) return temperature would typically mean an outlet temperature to under floor system of 45°C, giving at temperature
difference of 10°C.
5.3.4 Conne ting the Under Floor Cooling (UFC) thermistor T3
[Fig 5.1.4]
Note: thermistor (T3) attached to terminals 5 and 6 on ACH1 unit [Fig 5.1].
• T3 attached to water outlet from PQFY (outlet to under floor system)
o Set temperature to desired outlet temperature from under floor system, typically minimum allowable to avoid condensation on the
floor surface.
o i.e. no less than 18°C (1000) for laminate flooring.

12
5. . Connecting to the PQFY unit
5.2.1. Five Wire Adapter
[Fig 5.1 [C] and 5.2]
Attach the 5 wires on the adapter to ACH1 (C 52) starting with black to terminal 13, followed by red (14), white (15), yellow (16) and green (17). Insert plug
end to C 52 on the PQFY water heating unit PCB. Please note power to the ACH1 box is provided through the 5 wire adapter.
Note:
Ensure that the wiring is not pin hed when fitting the terminal box over . Pin hing the wiring may ut it.
Caution:
Install wiring so that it is not tight and under tension. Wiring under tension may break, or overheat and burn.
• After wiring is complete, make sure again that there is no slack on the connections, and attach the cover onto the control box in the reverse order
removal.
5.2.1. TH1H
[Fig. 5.2 [E] & 5.3]
Attach 2 core on-polarised 1.25mm shielded wire to both terminals 21 and 22, and then feed back to PQFY TH1H terminals ‘inlet air’ on PCB (see PQFY
manual).
Note:
Ensure that the wiring is not pin hed when fitting the terminal box over . Pin hing the wiring may ut it.
Caution:
Install wiring so that it is not tight and under tension. Wiring under tension may break, or overheat and burn.
• After wiring is complete, make sure again that there is no slack on the connections, and attach the cover onto the control box in the reverse order
removal.
5.3. Connecting the Immersion Signal
If immersion heating is required ( he k set up [Se tion 5.1.2]), then a onne tion has to be made between the ACH1 unit and the immersion
heater. When water has rea hed 44°C, the IH drive will be ome energised, and send a signal to the immersion heater to start.
Attach 2 core 1.25mm shielded wire to both terminals 18 and 19 on the ACH1 [Fig 5.1 [D]] and then to immersion heater, noting polarity.
Note:
Ensure that the wiring is not pin hed when fitting the terminal box over . Pin hing the wiring may ut it.
Caution:
Install wiring so that it is not tight and under tension. Wiring under tension may break, or overheat and burn.
• After wiring is complete, make sure again that there is no slack on the connections, and attach the cover onto the control box in the reverse order
removal.
5.4. Connecting the Mode Select
Attach 2 core 1.25mm shielded wire on the following terminal blocks on ACH1 [Fig 5.1 [B]].
o For DHW select, connect wires between terminals 7 and 8.
o For UFH select, connect wires between terminals 9 and 10.
o For UFC select, connect wires between terminals 11 and 12.
When a volt free connection is made, the mode will become selected and the unit will operate accordingly.
Note:
Ensure that the wiring is not pin hed when fitting the terminal box over . Pin hing the wiring may ut it.
Caution:
Install wiring so that it is not tight and under tension. Wiring under tension may break, or overheat and burn.
• After wiring is complete, make sure again that there is no slack on the connections, and attach the cover onto the control box in the reverse order
removal.
Notes:
• Che k that the bun h of wires do not ome off even if they are pulled strongly.

13
6. Setting up the Unit and Unit Logi
The ACH1 box an be used for different solutions. The unit an run all modes (DHW, UFH and UFC) on one PQFY system, but follows logi to
enable the best performan e possible from the system. There an be any ombination of modes. The next se tion details different s enarios and
explains how the unit responds.
Note: a PAR21 ontroller is needed along side the ACH1 and set to Auto mode
28°C. To see how this applies and is implemented please see the PQFY
manual.
6.1. DHW no Immersion Heater (IH)
Used when standalone immersion ontrol is available.
• Volt free connection is made between terminals 7 and 8 [Fig 5.3]
• Unit will sense temperature from T1 thermistor (connected on terminals 1 and 2)
• Desired temperature can be set on dipswitch (DHW) whereby O = 1, OFF = 0 (see table 6.1 for binary coding and corresponding temperatures in each
mode)
o Unit can be set from 41°C (0001) up to 55°C (1111)
• Unit will switch off when T1 senses the set temperature.
• Thermistors work to a diversity of ±1°C.
6. . DHW with Immersion Heater
Immersion an only be used when T1 is atta hed to the tank as in [5.3.2. type (a)] and when the immersion is submerged in the same tank as the
water heated from the PQFY.
• Volt free connection is made between terminals 7 and 8 [Fig 5.3]
• Unit will sense from T1 thermistor (connected terminals 1 and 2)
• Temperature set to 45°C (0000) all OFF on DHW dipswitch.
• When T1 reaches 44°C, a signal will be sent to the IH to come on and stay on until 60°C is sensed on T1 even if the DHW signal is lost on terminals 7
and 8.
• If T1 drops below 45°C, the PQFY will come on and the immersion will switch off. IH will then come on again at 44°C until T1 has achieved 60°C.
• If DHW signal is lost and T1 is below 45°C and 60°C hasn’t been achieved within one DHW cycle (i.e. signal is not renewed), immersion will come on and
heat the water to 60°C.
• Once 60°C is reached on T1 (legionella is controlled) in any case within one cycle (signal is not renewed), the immersion will not come on again. The
immersion will only be re-started if the DHW signal is lost, then renewed.
6.3. UFH
Used when under floor heating only is required.
• Volt free connection is made between terminals 9 and 10 [Fig 5.3]
• Unit will sense from T2 thermistor (connected terminals 3 and 4)
• Desired temperature can be set on dipswitch (DHW) whereby O = 1, OFF = 0 (see table 2.1 for binary coding and corresponding temperatures in each
mode)
o Unit can be set from 30°C (0000) up to 45°C (1111)
• Unit will switch off when T2 senses the set temperature.
6.4. UFC
Used when under floor ooling only is required.
• Volt free connection is made between terminals 11 and 12 [Fig 5.3]
• Unit will sense from T3 thermistor (connected terminals 5 and 6)
• Desired temperature can be set on dipswitch (DHW) whereby O = 1, OFF = 0 (see table 2.1 for binary coding and corresponding temperatures in each
mode)
o Unit can be set from 10°C (0000) up to 20°C (1011). ote anything above 1011 will equal a set temperature of 20°C.
• Unit will switch off when T3 senses the set temperature.

14
6.5. DHW and UFH
In this ase the DHW takes priority over the under floor heating. It is more important to have DHW than spa e heating, so until the water is up to
temperature (45°C), the system will ontrol to the DHW set point. This may mean that water slightly hotter than 45°C being applied to the under
floor heating system for a period of time.
• The system will operate as in 6.2, with the system being controlled from T1 until the set point has been achieved.
• After which point the UFH signal (T2) will take control as in 6.3.
• If using DHW with IH signal output; once DHW is heated to 45°C, IH will come on and stay on until 60°C at the same time UFH signal (T2) will take over.
6.6. DHW and UFC
The same priority takes pla e with DHW and UFC, DHW is more important than UFC.
• The system will operate as in 6.2, with the system being controlled from T1 until the set point has been achieved.
• After which point the UFC signal (T3) will take control as in 6.4.
• If using DHW with IH signal output; once DHW is heated to 45°C, IH will come on and stay on until 60°C at the same time UFC signal (T3) will take over.
6.7. UFH and UFC
Both will work when independently required. If both modes are requested simultaneously there will be NO operation.
7. Initial setting and test run
See PQFY manual for ommissioning and testing.

15
This product is designed and intended for use in the residential, commercial
and light-industrial environment.
The product at hand is based on the following EU regulations:
• Low Voltage Directive 73/23/EEC
• Electromagnetic Compatibility Directive 89/336/EEC
Please be sure to put the contact address/telephone number on
this manual before handing it to the customer.
MITSUBISHI ELECTRIC UK
MITSUBISHI ELECTRIC UK, TRAVELLERS LA E, HATFIELD, HERTDFORSHIRE, AL10 8XB