Domestic Hot Water Mode; Off Mode; Domestic Hot Water Function - Carrier 80AWX-065 series Installation, Operation And Maintenance Instructions

Pre-set climatic curves are shown in fig. 5 for heating and
fig. 6 for cooling.
If custom curves are used, the codes involved are shown in
fig. 7 for heating and fig. 8 for cooling.
If code 105.0 is set to 1 or 4 (see paragraph Zone Control
Settings), the water setpoint calculated through the
climatic curves is adjusted so that the room temperature
matches the room setpoint.
4.1.2 - Backup Heaters (heating mode only)
If the outdoor temperature is lower than code 129 and if
the difference between the water setpoint and the water
temperature is higher than code 130 for more than code
131 minutes, backup heater 1 is turned on.
If electric heater activation conditions are still valid after
code 131 minutes since backup heater 1 activation, backup
heater 2 and 3 (if available) and backup heater 1 are
turned off. If electric heater activation conditions are still
valid after code 131 minutes since backup heater 2 and 3
activation, backup heater 1 is turned on.
If the outdoor unit is not running because of failure, it is
possible to perform the heating operation through backup
heaters. See code 1.4 in the variable table.

4.2 - Domestic Hot Water Mode

Select the Domestic Hot Water mode on the user interface
by pressing the mode (M) button.
When this mode is selected, space heating/cooling is not
operating; the system is taking care of meeting only the
domestic hot water operation.
Water frost protection is active.
Home antifreeze protection is active if enabled (code 1.0).

4.3 - OFF Mode

When OFF mode is selected, space heating/cooling and
domestic hot water heating are not performed.
Water frost protection is active.
Home antifreeze protection is active if enabled (code 1.0).

4.4 - Domestic Hot Water Function

Domestic hot water can be managed by the system control
or by an external contact (code 133).
Domestic hot water is managed by the system control
when the unit is combined with a domestic hot water tank
listed in paragraph Accessories.
In this case the system control manages domestic hot
water production on the base of domestic hot water
temperature to optimise overall comfort (see priority logic
below), activates booster heater if needed and performs
disinfection function.
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Domestic hot water is managed by an external contact
when it is controlled by an ON/OFF contact (connected to
the domestic water input of the system control).
In this case overall comfort is not optimised, booster
heater is not activated and disinfection function is not
performed.
In all cases, domestic hot water valve is managed by the
system control.
If no domestic tank is connected, set code 133 to 3 and
code 106.0 to 0.
Domestic hot water production with outdoor unit or
backup boiler is based on priorities (fig. 9 and 10).
Note: Fig.10 refers to heat mode operation; in cool mode
E and F are added to C.
The system will switch from space heating/cooling to
domestic hot water production if:
• Domestic water priority is higher than room priority
for 15 minutes
• Room priority is 0 and there is a domestic water
demand.
The system will switch from domestic hot water
production to space heating/cooling if:
• Room priority is higher than domestic water priority
for 15 minutes
• Domestic water priority is 0 and there is a demand for
space heating/cooling
• Room priority is 1 for 2 minutes.
In Domestic Hot Water mode, room priority is set to 0.
If no room sensor is used, room priority is set to:
• 0.5, when there is no domestic hot water demand
• 0, when there is domestic hot water demand.
In case of boiler backup, priority lines are adjusted to
optimise energy efficiency.
4.4.1 - Domestic water input
Domestic water input has an effect on domestic hot water
priority.
Domestic hot water input can be connected to solar
control (set code 133 = 2), to stop domestic hot water
production from the system when solar source is available.
Domestic water input not active
When domestic water input is not active, domestic hot
water priority is set to 0 (see code 106.0).
Domestic water input is active
When domestic water input is active, if domestic hot water
is managed by system control (code 133=1 or 2), priority is
calculated normally; if it is managed by an external contact
(code 133=3), priority is set to 1.
If using a tank listed in the paragraph Accessories and
nothing is connected to this input, set code 106.0 = 1.