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English
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RG66012647
8.8 - External water circulator for MCI__X unit
Units without an integrated pump allow driving an external
one. The signal (1ph ~ 230V, 2A max) is supplied between
PINS 16 and N of the terminal strip (see fig 17).
8.9 - External alarm input
On PIN 21 of the terminal strip (see Fig. 17) an alarm input
(dry contact) is available to force of the unit.
When the contact is closed (Between pin 21 and 3) the whole
system is turned OFF (Unit OFF, WP OFF, GMC alarm n° 2).
When the dry contact open the system turns ON and works
in the last configuration.
It is possible to use this feature connected with different
external control systems and/or safety devices. For example
in case of danger an external safety device could send an
output alarm signal to close the contact. So the outdoor unit
turns off and remains in that condition until the dry contact is
reopened.
8.10 - Backup heater needed for sanitary hot water
When OAT < Temperature set in NUI code 148 (default value
-20°C), if Par 108 is set to 1, on pin 11 of the terminal strip a
signal is available to activate a backup source for SHW
production.
8.7 - Signal for requesting an External Heat Source (EHS)
Between PINS 4 and N of the terminal strip (see Fig. 17), there
is an output (1ph ~ 230V, 2A max) that can be programmed
using the remote User Comfort Interface (see the control
manual, Installation Menu code 106).
Two different strategies are possible based on Outdoor Air
Temperature:
1) Turn off heat pump and activate backup heat source.
This function is activated when OAT < Temperature set
in NUI code 148 (default value -20°C). In this region heat
pump turns off and external backup is activated
following one of below logic (NUI CODE 154):
•
Output always on (NUI CODE 154=0) assumes
backup has its own regulation.
•
ON/OFF based on room temperature set point (NUI
CODE 154=1)
•
ON/OFF based on water temperature set point
(CODE 154=2) in case NUI is not installed/available.
2) Both heat pump and backup heat source activated in
case Heat Pump delivered power is not enough. This
function is activated when OAT < Temperature set in NUI
code 150 (but OAT > temperature set in NUI code 148).
In this region HP keeps working and backup heater turns
on if set point on water is not reached by 5°C (value can
be set with NUI CODE 152) for 10 minutes (value can be
set with NUI CODE 151). Backup heater turns off when
set point on water is reached again.
IMPORTANT NOTICE: In case of SHW activation (pins 13-15
closed) heat pump will turn on and backup heater will turn
off. This will happen in both the above strategies.
WARNING: In case of EHS installation, it is mandatory to
install a thermal switch on the water circuit to protect the
system from too high water temperatures. This protection
item has to be located immediately downstream the EHS.
8.11 - Terminal strip pin
MCI__H
Description
PIN
Signal
Limits
33AW-CS1B Installation Menu
Code
Additional external temperature probe
23 - 24
Input (NTC 3kΩ @25°C)
N.A.
126
Sanitary Water Request
13 - 15
Input (contact switch quality>25mA@12V)
N.A.
153
Maximum Frequency Reduction Compressor
13 - 14
Input (contact switch quality >25mA@12V)
N.A.
5 - 6
3-way valve
10 - 18 - N
Output 230Vac (18-N: Power supply, 10 signal)
1 ph ~ 230V, 2A
N.A.
1- External Heat Source Request
2- Defrost
4 - N
Relay Output Contact
1 ph ~ 230V, 2A
106 - 148 -150
-151 - 152 -154
-155
1- Alarm
2- Ambient temperature reached
5 - N
Relay Output Contact
1 ph ~ 230V, 2A
147
1- Backup heater needed for SHW
2- Humidifier
11 - N
Relay Output Contact
1 ph ~ 230V, 2A
107 - 108
1- Trace heater
2- Additional WP
12 - N
Relay Output Contact
1 ph ~ 230V, 2A
156 - 157
Alarm input
21 - 3
Input (contact switch quality >25mA@12V)
N.A.
N.A.
ON / OFF
6 - 3
Dry contact
N.A.
N.A.
NORMAL / ECO Mode
8 - 3
Dry contact
N.A.
N.A.
Heating / Cooling Mode
7 - 3
Dry contact
N.A.
N.A.