Page 495 - General Catalogue

INTRODUCTION

Selection

Pair application selection
AIR PURIFIER

› the outdoor unit is connected to ONE COIL (with single circuit
or maximum 3 interlaced circuits) using up to 3 control boxes
› indoor unit combination is not allowed
HEATING
› only works with X, W, Y control

Step 1: Required AHU capacity Step 3: Control box selection

An AHU with double flow, heat recovery and 100% fresh air is to In this particular case, the control will work with precise air
be installed in Europe where the outdoor sizing temperature is 35 temperature control. Only W or X control allow this. Since the SPLIT
ºCDB and the target supply air temperature for fresh air is 25 ºCDB. consultant wants to use an “off-the-shelf” DDC module, the
Load calculations point to a required capacity of 45kW. EKEQFCBA box with W control allows easy set-up due to pre-set
By checking on the EKEXV capacity table, for cooling operation, factory values.
40kW falls within the 400 class valve. Since 40kW is not the nominal
capacity, a class adjustment has to be done. 40/45=0,89 and
0,89x400=356. So the capacity class of the expansion valve kit is SKY AIR
356.
Step 2: Outdoor unit selection

For this AHU, a VRV IV heat pump model with continuous heating is
going to be used (RYYQ-T series). For a capacity of 40kW at 35 ºCDB, VRV
an outdoor of 14HP (RYYQ14T) is selected. The capacity class of the
14 HP outdoor unit is 350.

Total connection ratio of the system is 356/350=102% hence it falls
VENTILATION & BID- DLE AIR CURTAINS
within the range 90-110%.

MARINE TYPES

Multi application selection

› the outdoor unit can be connected to MULTIPLE COILS
(and their control boxes)
› indoor units are also connectable but not mandatory CHILLERS
› only works with Z control

Step 1: Required AHU capacity Step 2: Outdoor unit selection
FAN COIL UNITS
An AHU with double flow, heat recovery and 100% fresh air is to For this system where a AHU is connected with indoor units,
be installed in Europe where the outdoor sizing temperature is it is mandatory to use a heat recovery unit. By consulting the
35 ºCDB and the target supply air temperature for fresh air is 25 engineering databook for REYQ-T, the total required capacity of 42,5
ºCDB. On top of this, for this building, 5 round-flow cassette units kW requires a 16HP model REYQ16T. Which will deliver 45kW at the
FXFQ50A will also be connected to this OU. design temperature of 35 ºCDB. This unit has a capacity class of 400.
Load calculations point to a required capacity of 20kW for the AHU Total connection ratio of the system is 428/400=107% hence it falls AIR HANDLING UNITS
and 22,5 kW for the indoor untis. within the range 50-110%.
By checking on the EKEXV capacity table, for cooling operation,
20kW falls within the 200 class valve. Since 22,4 kW is the nominal
capacity, a class adjustment has to be done. 20/22,4=0,89 and
0,89x200=178. So the capacity class of the expansion valve kit is Step 3: Control box selection
178. Total capacity class of the indoor unit system is 178+250=428 REFRIGERATION
In this particular case, the only available control is Z control and the
combination of AHU and VRV DX indoor units requires EKEQMCBA
control box.
CONTROL SYSTEMS

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