Mitsubishi Heavy Industries HMK60, Installation Manual

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48
Electrical installation
Optional connections
RC-HY20
Room sensor BT50
Room sensor can be connected to controller.
The room temperature sensor has up to three functions:
1. Show current room temperature in the control module
display.
2. Option of changing the room temperature in °C.
3. Makes it possible to change/stabilise the room temperature.
Install the sensor in a neutral position where the set temperature
is required. A suitable location is on a free inner wall in a hall
approx. 1.5 m above the fl oor.
Do not install the sensor where correct room temperature
cannot be detected such as in a recess, between shelves, behind
a curtain, above or close to a heat source, in a draft from an
external door or in direct sunlight.
Closed radiator thermostats can also cause problems.
The control module can operate without the sensor, but if user
wants to read off the accommodation's indoor temperature in
controller display, the sensor must be installed.
Connect the room sensor to the port 7 and 10 on X2 terminal.
If the sensor is to be used to change the room temperature in
°C and/or to change/stabilise the room temperature, the sensor
must be activated in menu 1.9.4.
If the room sensor is used in a room with underfl oor heating, it
should only have an indicatory function, not control of the
room temperature.
9
10
11
6
8
7
External RC-HY 20
X2
BT50
RC-HY20
X2
CAUTION
Changes of temperature in accommodation
take time. For example, short time periods in
combination with underfloor heating will not
give a noticeable difference in room temperature.
Use two-core cable with a minimum 0.5mm
2
cross section.
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.
SMO
E
6
1 0 PE
A1
A2
A1
A2
A1
-K1 -K2 -K3
A2
External
RC-HY
20/40
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-HY20/40
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.