Mitsubishi Heavy Industries HMK60, Installation Manual

Page: 244 / 288

38
Electrical installation
• AUX outputs
External output is available on the port 15 to 17 on X4 terminal
on AA2 board on RC-HY20. The relay output can have a max
load of 2A at resistive load.
4 1 5 1 6 1 7 1
SMO
Externt
External
RC-HY 20
AA2-X4
LEK
L N 1 1 0 2 3 4 PE
AA2-X4
RC-HY20
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 15 and 16. During normal operation, the port 15 and
17 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 15 and 16. 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 page 32, 33.
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 24 for diagram).
Connect the circulation pump as shown below using the port
15 and 16 on X4 terminal.
4 1 5 1 6 1 7 1
SMO
Externt
L
L
N
N
PE
PE
External
RC-HY 20
AA2-X4
LEK
L N 1 1 0 2 3 4 PE
AA2-X4
RC-HY20
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 page 20 for diagram).
■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