5 Preparation
Installer and user reference guide
10
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
4.2.4
About the indoor unit
The SEHVX indoor units are intended for indoor installation and can
be used for air conditioning purposes or for supplying water for
process cooling applications.
The units are available in 4 standard sizes with nominal capacities
ranging from 21.2 to 63.3 kW.
The unit is designed to work in heating mode at ambient
temperatures from –15°C to 35°C and in cooling mode at ambient
temperatures from –5°C to 43°C.
The main component is the water heat exchanger.
The indoor unit is connected to the outdoor unit by field refrigerant
piping and the compressor in the outdoor unit circulates refrigerant
into the heat exchangers.
▪ In cooling mode, the refrigerant transports the heat taken from the
water heat exchanger to the air heat exchanger where the heat is
released to the air.
▪ In heating mode, the refrigerant transports the heat taken from the
air heat exchanger to the water heat exchanger where the heat is
released to the water.
4.2.5
About combining units and options
The indoor unit can be combined with fan coil units and is intended
for R410A use only.
4.2.6
Operation range
Cooling
43
–5
0
0
5
20
25
LWE
T
A
A
B
T
A
Ambient temperature (°C DB)
LWE
Leaving water evaporator temperature (°C)
A
Standard water operation range
B
Pull down area
Heating
0
35
25
5
–15
5 (EWC)
20 25
35
50
LWC
T
A
A
B
T
A
Ambient temperature (°C DB)
LWC
Leaving water condenser temperature (°C)
EWC
Entering water condenser temperature (°C)
A
Pull up area
B
Standard water operation range
4.3
Combining units and options
4.3.1
Possible options for the split system
INFORMATION
Refer to the technical engineering data for the latest option
names.
Remote controller (EKRUAHTB)
A second remote controller to control the unit from 2 locations.
Demand PCB (EKRP1AHTA)
To enable the power saving consumption control by digital inputs
you must install the demand PCB.
For installation instructions, see the installation manual of the
demand PCB. In case of 64BAW, 2 sets of this option
are required.
External control adaptor (DTA104A62)
To instruct specific operation with an external input coming from a
central control, the external control adaptor can be used. Instructions
(group or individual) can be given for low noise operation and power
consumption limitation operation. In case of 64BAW, 2
sets of this option are required.
4.4
System layout
RC
RT1
M1
RT2
M2
RT3
M3
FC1
FC2
FC3
a
c
e
f
f g
g
g
h
d
b
a
Outdoor unit
b
Indoor unit
c
Plate heat exchanger
d
Pump
e
Expansion vessel
f
Shut-off valve
g
Motorized valve
h
Bypass valve
FC1…3
Fancoil unit (field supply)
RC
User interface
RT1…3
Room thermostat
5
Preparation
5.1
Overview: Preparation
This chapter describes what you have to do and know before going
on-site.
It contains information about:
▪ Preparing the installation site
▪ Preparing the refrigerant piping
▪ Preparing the water piping
▪ Preparing the electrical wiring
