RKHBRD011~Y1
Indoor unit for air to water heat pump system
4PW61218-1C – 2012.06
Installation manual
8
Switch box main components
V1 unit types (1-phase)
Y1 unit types (3-phase)
1.
Main PCB
The main PCB (Printed Circuit Board) controls the functioning of
the unit.
2.
Control PCB
3.
Inverter PCB
4.
Inverter control PCB (only Y1)
5.
QA PCB (only V1)
6.
Filter PCB
7.
Digital I/O PCB (optional)
8.
Demand PCB (optional)
9.
Terminal block X1M
Main terminal block which allows easy connection of field wiring
for power supply.
10.
Terminal block X3M
Field wiring terminal block for DC connections.
11.
Terminal block X2M
Field wiring terminal block for AC connections.
12.
DC connector X1Y
13.
Pump connector X2Y
14.
AC connector X3Y
15.
Cable tie mountings
The cable tie mountings allow to fix the field wiring with cable
ties to the switch box to ensure strain relief.
16.
Power wiring entry
17.
AC field wiring entry
18.
DC field wiring entry
19.
Compressor cable entry
20.
Interface relay K1A
21.
Wiring bridges
22.
Fuse F1 (only Y1)
23.
Fuse F2 (only Y1)
Functional diagram
8
12
20
19
14
13
1
3
5
9
16
17
18
10
11
6
7
21
2
8
1 2
2 0
1 9
1 4
1 3
1
2
3
4
6
16
17
18
10
9
11
2 3
21 22
7
NOTE
The electrical connection diagram can be found on the
inside of the switch box cover.
1
Outdoor unit
16
Fill valve (field supply)
2
Indoor unit
17
Shut-off valve water inlet
3
Refrigerant-refrigerant
heat exchanger
18
Shut-off valve water outlet
19
Domestic hot water tank
(optional)
4
Accumulator
5
Compressor
20
Motorized 3-way valve
(optional)
6
Service port
7
Refrigerant-water heat
exchanger
21
Thermal cut-out (Q2L)
22
High pressure switch (S1PH)
8
Drain valve
23
High pressure sensor (B1PH)
9
Electronic expansion
valve
24
Low pressure sensor (B1PL)
25
Discharge thermistor (R6T)
10
Pressure relief valve
26
Leaving water thermistor (R5T)
11
Pump
27
Returning water thermistor
(R4T)
12
Air purge valve
13
Manometer
28
Liquid thermistor R134a (R7T)
14
Expansion vessel
29
Liquid thermistor R410A (R3T)
15
Water filter
M
1
2
3
8
9
28
29
12
27
11
21
6
4
7
14
15
17
19
16
25
5
6
22
23
24
26
20
18
13
10
