Carrier AquaSnap Plus 30AWH008XB - Additional Auxiliary Accessories

10 30AWH
Auxiliary accessories connection (Fig. 17)
External water circulator for 30AWH__X unit
External Alarm Input
Units without an integrated pump allow driving an external
one.
OnPIN21oftheterminalstrip(seeFig.17)analarminput(dry
contact) is available to force o 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.
Thesignal(1ph~230V,2Amax)issuppliedbetweenPINS
16andNoftheterminalstrip(seeg.17).
It is possible to use this feature connected with dierent
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 o and remains in that condition until the dry contact
is reopened.
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 dierent strategies are possible based on Outdoor Air
Temperature:
1) Turn o 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 o 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 o 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 o. 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.
Additional Water pump (ADD WP )
It is possible to connect an additional water pump through the
pins 12 and N. It is managed in the following way:
IfOAT>temperaturesetinNUI code 148.
The additional water pump activation depending by the NUI
code 156.
1. ON/ OFF depending on the outdoor unit water pump logic,
incaseofSHWactivationADDWPisON;
2. ON/ OFF depending on the outdoor unit water pump logic,
incaseofSHWactivationADDWPisOFF;
If OAT < temperature set in NUI code 148.
The additional water pump activation depending by the
NUI code 157 (0. always o, 1. on/o depending by EHS, 2.
always on).
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