Daikin HXHD125A7V1B, Installation Manual, Page: 21 / 52

HXHD125A7V1B
VRVIII system indoor unit
4PW62584-1A – 11.2010
Installation manual
19
8.2. Internal wiring – Parts table
Refer to the wiring diagram sticker on the unit. The abbreviations
used are listed below:
A1P............................ Main PCB
A2P............................ User interface PCB
A3P............................ Control PCB
A4P............................ Inverter PCB
A5P............................ QA PCB
A6P............................ Filter PCB
A7P......................* .... Digital I/O PCB
A8P......................* .... Demand PCB
A9P............................ Multi tenant PCB
A10P....................* .... Thermostat PCB
A11P....................* .... Receiver PCB
B1PH ......................... High pressure sensor
B1PL.......................... Low pressure sensor
C1~C3 ....................... Filter capacitor
C1~C3 (A4P) ............. PCB capacitor
DS1 (A*P) .................. Dip switch
F1U............................ Fuse (T, 3.2 A, 250 V)
F1U (A1P,A3P,A9P) ... Fuse (T, 3.15 A, 250 V)
F1U (A6P).................. Fuse (T, 6.3 A, 250 V)
F1U,F2U (A7P) ....* .... Fuse (5 A, 250 V)
F3U,F4U ..............* .... Fuse (T, 6.3 A, 250 V)
HAP (A*P).................. PCB LED
IPM1 .......................... Integrated power module
K1A~K3A ................... Interface relay
K1E~K3E ................... Electronic expansion valve
K*R (A*P)................... PCB relay
K1S~K3S ................... 3-way valve
K4S..................... # .... 2-way valve
M1C ........................... Compressor
M1F ........................... Switch box cooling fan
M1P,M2P ................... DC inverter pump
PC (A11P) ...........* .... Power circuit
PHC1 ...................* .... Optocoupler input circuit
PS (A*P) .................... Switching power supply
Q1DI,Q2DI.......... # .... Earth leakage protector
Q2L............................ Thermal protector water piping
R1,R2 (A4P) .............. Resistance
R1L ............................ Reactor
R1H (A10P) .........* .... Humidity sensor
R1T (R10P) .........* .... Ambient sensor
R2T......................* .... Domestic hot water tank thermistor
R2T......................* .... External sensor (floor or ambient)
R3T............................ Liquid thermistor R410A
R4T............................ Returning water thermistor
R5T............................ Leaving water thermistor (heating)
R6T............................ Discharge thermistor
R7T............................ Liquid thermistor R134a
R8T............................ Fin thermistor
R9T............................ Leaving water thermistor (cooling)
R10T.......................... Liquid thermistor (cooling)
R11T.......................... Suction thermistor (cooling)
RC (A*P) .................... Receiver circuit
S1PH ......................... High pressure switch
S1S ..................... # .... Benefit kWh rate power supply contact
S3S ..................... # .... Input multiple setpoint 1
S4S ..................... # .... Input multiple setpoint 2
SS1 (A1P).................. Selector switch (emergency)
SS1 (A2P).................. Selector switch (master/slave)
SS1 (A7P)............* .... Selector switch
TC (A*P) .................... Transmitter circuit
T1R,T2R (A*P) .......... Diode bridge
T3R ............................ Power module
V1C~V8C................... Ferrite core noise filter
X1M~X3M.................. Terminal strip
X1Y~X4Y ................... Connector
X*M (A*P) ............* .... PCB terminal strip
Z1F~Z5F (A*P) .......... Noise filter
* .... Included in option kit
# .... field supplied
8.3. System overview of field wiring
Field wiring consists out of power supply, multi tenant power supply,
indoor-outdoor communication (=transmission) wiring, wiring of the
user interface, wiring for connection of options and field supply
accessories.
INFORMATION
The wiring diagram on the indoor unit is only for the indoor
unit.
For the outdoor unit refer to the wiring diagram of the
outdoor unit.
CAUTION
■
Carefully install multi tenant power supply.
This power supply will guarantee correct outdoor unit
operation if one tenant shuts of power supply. If the
multi tenant power supply is not installed, the outdoor
unit will stop operating if one tenant shuts off the main
power supply.
■
If during service the main power supply is cut off for
safety of electric shock, make sure that also the multi
tenant power supply is cut off.