Daikin HCU4070PXB1 [81/169] Functions

ENG

pRack PR300T +0300018EN rel. 1.5 - 02.05.2017

6. FUNCTIONS

6.1 Schematic diagram and system

con gurations used

The schematic diagram of a transcritical system is shown in the  gure:

RPRV

HPV

Fig. 6.a

This shows the two medium and low temperature lines, the HPV valve,

which separates the high pressure part of the circuit from the medium

pressure part, and the RPRV valve which regulates the pressure in the

receiver. Both valves can be managed directly by the controller with built-

in driver (PRK30TD*).

Management of the system can be performed using one of the system

con gurations described hereafter.

Con guration 1: a pRack pR300T board for managing both suction lines

and control of the high pressure part (this con guration can be used also

as a backup controller):

pLAN 1

address

Fig. 6.b

Con guration 2: 1 a pRack pR300T board for each suction line and 1

pRack pR300T board for control of the high pressure part (gas cooler and

HPV, RPRV valves):

pLAN 1

address

pLAN 2

address

pLAN 3

address

Fig. 6.c

Con guration 3: a pRack pR300T board to manage the medium

temperature suction line and control of the high pressure part and a

board for managing the low temperature suction line:

pLAN 1

address

pLAN 2

address

Fig. 6.d

Page 81 of 169

P4367 Rev 01