Installation manual

22
Stop Unit or Defrosting signals
Frequency Limitation
3-way valve
The Aeromax Plus units drive a 3-way valve to manage a
Domestic Hot Water cylinder. The operating logic
provides that, in the case of a request for sanitary water
by a DHW cylinder, the system controls a 3-way valve to
direct the hot water only to the tank and to operate at
the maximum capacity to provide water at 60 °C
(compatible with the operating envelope).
The hot water request signal must be a Dry Contact type
(contact quality greater than 25mA @ 12V) that closes
the circuit between PINS 15 and 13 of the terminal strip
(see Fig. 13 page 21).
Attention: The hot water request has higher priority than
the programmed operating mode in heating.
To force the unit to operate at a lower maximum
frequency (to reduce noise) in the absence of a User
Comfort Interface, provide a Dry Contact (contact quality
greater than 25mA @ 12V) between PINS 13 and 14 of
the terminal strip. With the contact closed, the unit will
operate with a maximum frequency lower than the
standard one, otherwise it will operate in standard mode.
For correct operation, it is necessary to configure the
unit using parameters 5 and 6 from the User Interface
menu of the KHP0008. The maximum noise reduction
is about 3dB at 75% of the maximum operating
frequency of the compressor
There are several signals available on the terminal strip
to indicate particular conditions or the stop of the
external unit. The available signals are:
• Defrosting: When operating in Heating mode,
depending on the external environmental conditions,
the unit could perform defrosting cycles to clean the
external battery of any ice formations. Under these
conditions, it is not possible to guarantee the
requested temperature output water temperature,
which could reduce general comfort.
• Alarm: Indicates an alarm condition that stops the
compressor.
• Ambient Temperature Reached: If suitably
programmed using the User Comfort Interface, and
operating with this interface, a signal is provided that
indicates that the pre-set temperature has been
reached. This signal can be used as the contact
window normally implemented in the fan-coils.
Several outputs are used for more than one condition. It
is possible to configure these outputs through the User
Comfort Interface installation menu (refer to the
KHP0008 manual part number A9315). Refer to the
tables for the correct pin-outs and use of the signals.
External temperature probe
If the positioning of the external unit could induce a non-
representative reading of the external temperature by the
probe positioned on the machine, an additional remote
temperature probe can be provided (NTC 2 wire, 3kΩ @
25°C, Kingspan Part Number KHP0009). Connect the
terminals of the probe between PINS 23 and 24 of the
terminal strip (see Fig. 13).
Auxiliary accessories connection (Fig. 13)
Legionella Protection
Sanitization of the DHW cylinder is controlled by setting
the time on the 7 day programmer installed. To sanitise
the water in the cylinder set the hot water period to more
than 50 mins.
Example:
Heat pump programmed to heat water 4:00 am – 5:30
am. Heat pump will produce hot water for 50 mins to
approx 55°C. Immersion heater will activate for the
remaining 40mins to raise water temperature to 60°C+.
The immersion heater will stop when the immersion
heater thermostat activates.