Mitsubishi Heavy Industries HMK60, Installation Manual

Page: 53 / 288

51
Electrical installation
■Contact for activation of “temporary lux”
Temporary hot water production function “temporary lux” is
activated with this signal. Connect the terminals with a
potential-free switch and choose the function in menu 5.4.
“Temporary lux” is activated only when the switch is closed.
■Contact for activation of “external adjustment”
Target temperature offset for supply temperature or room
temperature can be done with this signal.
When a room sensor is connected and activated, the target
room temperature is offset in ℃ if the switch is closed.
When a room sensor is not connected, target supply water
temperature (heat curve) is offset instead. The degree of
off set can be set in menu 5.4.
■Switch for external alarm
Alarms from external devices can be connected to the control
and appear as an info alarm. Potential-free signal of NO or
NC type can be connected.
■Switch for external blocking
This function is used in case certain operation mode needs to
be prohibited. The operation at selected operation mode is
prohibited when the switch is closed. Following functions
can be managed.
Additional heat
compressor operation
heating mode
cooling mode
hot water mode
■ Temperature sensor, fl ow line cooling (BT64)
Temperature sensor BT64 is required in case 4-pipe system
is used for cooling operation. (see page 26-28 for diagram)
This option can be chosen only in case cooling function is
activated.
■ Contact for external tariff blocking
In cases where external tariff blocking is required it must be
connected to terminal block X2.
Tariff blocking means that the additional heat, the
compressor, heating and cooling are disconnected by
connecting a potential free switch function to the input
selected in menu 5.4.
A closed contact results in the electrical output being
disconnected.
■ Switch for “SG ready”
NOTE
This function can only be used in mains networks
that support the "SG Ready"-standard .
"SG Ready" requires two AUX inputs.
This function can only be used in power supply networks that
support the “SG Ready” standard. “SG Ready” requires two
AUX inputs.
“SG Ready” is a smart tariff management scheme in which
electricity supplier can aff ect indoor and hot water temperature
or simply prohibits additional heat and/or the compressor
operation in heat pump at certain period of the day. You can
choose which operation mode is affected by this function in
menu 4.1.5 after the function is activated.
Choose two external input circuits and connect potential-free
switches, and set “SG Ready A” and “SG Ready B” in menu
5.4. The system works diff erently according to the combination
of the circuit open/closed.
Blocking (A: Closed, B: Open)
“SG Ready” is active. Compressor operation and additional
heat is prohibited.
Normal mode (A: Open, B: Open)
“SG Ready” is not active. No eff ect on the system.
Low price mode (A: Open, B: Closed)
"SG Ready" is active. The system operates to provide higher
capacity than normal mode by using lower tariff electricity.
You can select the operation mode (heating/hot water/
cooling) aff ected by this function in menu 4.1.5.
Overcapacity mode (A: Closed, B: Closed)
“SG Ready” is active. The system supplies higher capacity
than Low price mode since the electricity price is supposed
to be very low in this mode. You can select the operation
mode (heating/hot water/cooling) aff ected by this function in
menu 4.1.5.