Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

Page: 112 / 315

Installation
'19 • HM-T-340
Indoor unit installation
AUX inputs
Up to 6 other external inputs are available on RC-HY40 -W .
AUX1 through 3 correspond to the port 9/10, 11/12, 13/14
respectively on X6 terminal on AA3 board. AUX4 through 6
correspond to the port 1, 2 and 3 on X2 terminal on RC-HY40.
Port 4 on X2 terminal is GND and is common to AUX4
through 6. Connect a sensor or switch between AUX and GND
with a 2 cores cable with a minimum cross section of 0.5mm
2
.
AUX1
AUX2
AUX3
RC-HY40 -W
AUX4 A
UX5
GND
A
UX6
AA3-X6
X2
Select the appropriate function in menu 5.4.
block heating
activate temp lux
not used
soft in/outputs 5.4
not used
not used
not used
■ Temperature sensor, external supply at additional heat before
reversing valve (BT63)
Temperature sensor BT63 is applied in case additional heater
is placed before 3-way valve (see page 287 for diagram)
The following functions are available. For details, see AUX
inputs for RC-HY20 -W .
■ Temperature sensor, cooling/heating (BT74)
■ Temperature sensor, external return line (BT71)
■ Temperature sensor, fl ow line cooling (BT64)
■ Contact for external tariff blocking
■ Switch for “SG ready”
■Contact for activation of “temporary lux”
■Contact for activation of “external adjustment”
■Switch for external alarm
■Switch for external blocking
AUX outputs
External output is available on the port NC, NO and C on X7
terminal on AA3 board on RC-HY40 -W . The relay output
can have a max load of 2A at resistive load.
Following functions are available. Select the function in menu
5.4.
Indication of buzzer alarm
When an alarm occurs, the circuit becomes closed between
the port NO and C. During normal operation, the port NC
and C is closed.
Cooling mode indication / Active cooling mode (4-pipe
cooling)
When the system turns into cooling mode, the circuit
becomes closed between the port NO and C. By using this
signal, it is possible to switch 3-way valve for 4-pipe cooling
or to assemble a display circuit indicating cooling mode. For
details of connecting the 3-way valve, refer to pages 98 and
99.
External pump control (GP10)
External pump (GP10) is used in case additional heater is
placed after 3-way valve that switches heating/hot water
(refer to page 288 for diagram).
Connect the circulation pump using the port NO and C on
X7 terminal on AA3 board as shown below.
C N O N C
Externt
L
PE
N
N
PE
L
External
AA3-X7
AA3-X7
RC-HY40 -W
Hot water circulation pump control (GP11)
In case the distance between hot water tap and hot water
storage tank is far, the hot water supply line temperature is
likely to drop and it may take time to supply hot water from
the tap. In that case, hot water circulation pump (GP11) is
applied to maintain hot water supply line temperature warm
(refer to pages 86, 87 for diagram).
For details of connecting the pump, refer to External pump
control (GP10).
NOTE
Mark up any junction boxes with warnings for external
voltage.
- 110 -
R C-HY40-W
#