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Monobloc Outdoor Unit Installation Manual
7.8.14 External electrical connections – additional outside air temperature (OAT) sensor
7.8.15 External electrical connections – Header / Follower system configuration
A header / follower installation permits connection of up to four units in parallel: one header unit can control from
one to three follower units.
This kind of installation must comprise:
•
same unit size (17kW or 21kW)
•
equipped with hydronic kit (variable or fixed speed kit).
If the unit is fitted with a variable speed hydraulic kit, the pump must be controlled by the adjustable constant
speed logic (no ΔT logic).The header / follower operation is
incompatible with Domestic Hot Water production.
Only the header unit can be fitted with remote controller and BACnet or LON gateway options.
An additional common leaving water temperature sensor must be installed on site, on the common piping.
NHC
NHC
NHC
NHC
Header 01
Follower 01
Follower 02
Follower 03
OAT
CHWST
If the unit is unfavourably located, leading to incorrect reading of OAT, it is possible to install an additional outdoor
air temperature sensor, located in an appropriate position. Follow the connection details as shown below. Use
parameter P511 to configure the OAT sensor.
This sensor is available as an accessory. For more details on its installation, refer to accessory document.
O
AT
Chiller water System Temperature
Outdoor Air Temp
Ground-Sensor [Ω]
Acc
