Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

Page: 105 / 315

Installation
‘19 • HM-T-340
Indoor unit installation
Relay output for emergency mode
NOTE
Mark up any junction boxes with warnings for
external voltage.
When the switch (SF1) is in " " mode (emergency mode) the
circulation pump is activated (EB101-GP12).
CAUTION
No hot water is produced when emergency
mode is activated.
The emergency mode relay can be used to activate external
additional heat. Between the port 2 and 4 is closed during
emergency mode. An external thermostat must be connected to
the control circuit (port 4) to control the temperature. Ensure
that the heating medium circulates through the external
additional heating.
E P 2 3 4
Externt
X1
External
RC-HY20-W
RC-HY20 -W X1
If the relay is to be used for control voltage, bridge the supply
from terminal block X1:1 to X1:2 and connect neutral and
control voltage from the external additional heat to X1:0 (N)
and X1:4 (L).
1 0 E P 2 3 4
Externt
N L
X1
External
RC-HY20-W
RC-HY20 -W
X1
Step controlled additional heat
NOTE
Mark up any junction boxes with warnings for
external voltage.
External step controlled additional heat can be controlled by up
to three potential-free relays in the control module (3-step
linear or 7-step binary). Alternatively two relays (2-step linear
or 3-step binary) can be used for step controlled additional
heat, which means that the third relay can be used to control
the immersion heater in the water heater/accumulator tank.
Step in occurs with at least 1 minute intervals and step outs
with at least 3 seconds intervals.
Step 1 is connected to terminal block X2:2 on the additional
relay board (AA7).
Step 2 is connected to terminal block X2:4 on the additional
relay board (AA7).
Step 3 or immersion heater in the water heater/accumulator
tank is connected to terminal block X2:6 on the additional
relay board (AA7).
The settings for step controlled additional heat are made in
menu 4.9.3 and menu 5.1.12.
All additional heat can be blocked by connecting a potential-
free switch function to the software controlled input on
terminal block X2 which is selected in menu 5.4.
E
6
1 0 PE
A1
A2
A1
A2
A1
-K1 -K2 -K3
A2
External
RC -HY 20-W
AA7-X2 X1
LEK
L N 1 1 0 2 3 4 PE
X1
1 1 N L 0 E P 2 3 4
-X2
1
12
34
56
2 3 4 5 6
-X1
AA7-X2
RC-HY20 -W
If the relays are to be used for control voltage, bridge the
supply from terminal block X1:1 toX2:1, X2:3 and X2:5 on
additional relay board (AA7). Connect the neutral from the
external additional heat to terminal block X1:0.
Use a cable with appropriate cross section.
For connection, see the installation manual for additional
heater.
- 103 -
#