Carrier 30AW - External Heat Source (EHS) Request Signal; External Water Circulator for 30 AWH_X; External Alarm Input; Backup Heater for Sanitary Hot Water

23
English
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.
8.8 - External water circulator for 30AWH__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 g 17).

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 conguration.
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.

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.

(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.

30AWH__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-Humidier
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.