Mitsubishi Electric PUHZ-W50VHA Technical Manual page 92

(2)-1. Space heating by under fl oor heating
with split outdoor unit+HYDROBOX + FTC
*variable capacity request signals for Heat Pump is calculated by FTC.
1) System outline
Split
O/U
Refrigerant pipe
temp.themistor
(Liquid side)
2) Wiring / Switch setting
Flow temp.thermistor
Refrigerant pipe (liquid) temp.thermistor
Analog signal(1-5V)setting temp.input
PAR-W21MAA
Remote Controller
(for initial parameter
setting: not always
necessary)
Cooling
System controller
Set temperature
(user interface)
SW1
ON
1 2 3 4
System select
<Analog temp. system>
•ON/OFF, operation mode by
external input
•Set temp. by external analog
input
Prohibition of cooling mode
OFF: permit
Fixed OFF
HYDRO BOX (locally supplied)
FTC
(PCB)
Refrigerant pipe
* *
(Gas)
Refrigerant pipe
(Liquid)
Flow temp.
thermistor
(outlet side)
TB61
1
2
3
4
5
6
1
2
1
TB62
2
3
4
5
6
TB142
2 4 6 8 10
1 3 5 7 9 11 13
(External Input)
X12
X11
Heating
Pump Valve
(ON/OFF) (ON/OFF)
SW2
ON
1 2 3 4 5 6
5 6 7 8
Set temp. by DIP switch
(not in use in this case)
Set temp. rarge
Heating mode.
max55:: O/U is split type.
Set temp. by DIP switch
OFF: by R/C or Analog signal
TH2(liquid pipe thermistor) connection
OFF: nead to connect(split O/U)
*system
controller
*pump
*Valve
Flow sensor
(to prevent
pipes from
freezing)
FTC board
SW1 SW2 SW3
1 1 1
8 8 8
OFF/ON OFF/ON OFF/ON
SW6
OFF/ON
12 14
Flow sensor
Forced Comp. OFF →
Cooling mode →
Heating mode
Auxiliary heater
(ON/OFF)
SW3
ON
7 8 1 2 3 4 5 6 7
Fixed OFF FTC
Logic of forced comp OFF input
by external signal(TB142: 5-6)
OFF: short→comp OFF
ON: open→comp OFF
92
* Under Floor Heating
Auxiliary
heater
* locally supplied
CNS2
1 2
TO OUTDOOR UNIT
S1 S2 S3
TB6
L N
To metal chassis
At site FTC
TB142
1
2
3
4
5
6
7
8
X11
9
10
→ 11
X12
12
13
14
SW6
ON
1 2
8
Fixed OFF
Analog input setting
1:OFF 2:ON→1-5V
1:ON 2:ON→4-20mA
1:OFF 2:OFF→0-10V