Mitsubishi ACH1 Installation Manual

Water Heating Unit Control Box

ACH1

FOR INSTALLERS

INSTALLATION MANUAL

For safe and correct use, please read this installation manual thoroughly before installing the ACH1 control box.

0

2

[Fig. 2.1]

1 2

3

4

1 Thermistor x 3

2 ACH1 box

3 5 wire adapter

4 Installation manual

1

5

1 2 3 4 5 6 7 8 9 10 11 12

13 14 15 16 17 18 19 20 21 22

T1 (DHW)

T2 (UFH) T3 (UFC) DHW SELECT UFH SELECT UFC SELECT

+ 40°C**

+ 30°C

+ 10°C***

[Fig. 5.1]

A B

Switch ‘ON’
represents

Set Switches

using BCD

encoding*

‘8’
‘4’
‘2’
‘1’

DHW

SET

41-55

Set value =

BCD

setting

UFH
SET

30-45

Set value =

BCD

setting

UFC
SET

10-20

Set value =

BCD

setting

C

1

5

0v +

CN52

* See table 2.1 for more detailed explanation of BCD encoding
** All DHW switches OFF gives 45°C with Immersion Heater Signal
*** UFC settings above 20 are treated as 20

D

E

TH1H

IH Drive
5v 10mA

A Thermistors (5K NTC, R = 5K Beta = 3980 : at 25°C

B Mode select (require volt free inputs)

C 5 wire connector to CN52 on PQFY (1 = black)

D Immersion heater output

E Connection to TH1H on PQFY

2

5

[Fig. 5.1.1]

C

A

D

E

B

A Water pipe

B Thermistor

C Aluminium tape (field supply)

D Insulation

E Tie band

3

5

5

[Fig. 5.1.2.1]

A

B

C

D

E

(b)

B

T1

F

(a)

A PQFY water heater

B Centrifugal pump

C 3 way valve*

D Plate heat exchanger

E Immersion heater

F Water tank (Direct Cylinder)

DHW thermistor [(a) or (b)]

T1

*Only needed if using under floor system

[Fig. 5.1.2.2]

A

B

C

E

(b)

T1

D

F

(a)

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)

DHW thermistor [(a) or (b)]

T1

*Only needed if using under floor system

4