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The PAR 21 must be set to auto 28
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mode.
Where the PQFY is being used to produce domestic hot water, when connected to a heat pump, it should be registered on the system as the
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lowest addressed fan coil, thus making it automatically the master.
This means that if fan coils on the same refrigerant system required cooling they will not produce cooling until the PQFY has been
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switched off.
To avoid such conflict it is recommended that the PQFY be used to heat up domestic hot water during the night e.g. typically between 12am and
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7am.
This will also use the cheaper night time electricity (economy 7 electricity).
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(Be sure to install and wire with the main power turned OFF.)
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Setting the PQFY address:
[Fig 8.1.1] (P.6)
There are two types of rotary switch setting available: setting addresses 1 to 9 and over 10, and setting branch numbers.
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How to set addresses
Example: If Address is "3", remain SW12 (for over 10) at "0", and match SW11 (for I to 9) with "3".
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How to set branch numbers SW14 (Series R2 only)
Match the indoor unit's refrigerant pipe with the BC controller's end connection number. Remain other than R2 at "0".
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The rotary switches are all set to "0" when shipped from the factory. These switches can be used to set unit addresses and branch
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numbers at will.
The determination of indoor unit addresses varies with the system at site. Set them referring to technical data.
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8.2. Setting unit size - Indexing
In the case of the connection of a heat pump to the PQFY-P140/250, if the PQFY is the only unit designed to run in heating at one time then
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measures should be taken to ensure the other water heating or air heating fan coils are not switched on at the same time. This is to ensure that
sufficient capacity is available to heat the water.
If other water heating or air heating fan coils are designed to run at the same time as the PQFY then the heat pump should be sized to cope with
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all of the heat loads at the design condition. It is recommended that no diversity be used in this design as poor heat capacity will result if the
outdoor unit is under sized.
In the case of the connection of a heat recovery heat pump to the PQFY-P140/250, if the PQFY is the only unit designed to run in heating at one
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time measures should be taken to ensure the other water heating or air heating fan coils are not switched on at the same time. This is to ensure
that sufficient capacity is available to heat the water.
If other water heating or air heating fan coils are designed to run at the same time as the PQFY then the heat pump should be sized to cope with
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all of the heat loads at the design condition. It is recommended that no diversity be used in this design as poor heat capacity will result if the
outdoor unit is under sized.
The dip switches (SW2) on the control board should be set from the factory as shown in the chart below.
Type
Unit size
Capacity
P140
14 kW
PQFY
P250
25 kW
o
C degrees and then installed within the outer cover of the PQFY to avoid any changing of the set point or
Index
Setting switches (SW2)
ON
20
OFF
ON
200
OFF
15
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