Hydraulic Connections; Limits Of Use; Circulating Pump - Johnson Controls YORK YLCC-42 Hinweise Zum Einbau

Hydraulic connections

The hydraulic connections of the water in-
take and outlet of the chiller should be car-
ried out respecting the intake and outlet
directions indicated. (Fig. 8)
Iron (non galvanized) or copper tubing can
be use, with dimensions no lower than
those indicated, and keeping in mind the
pressure drops at said connections and at
the internal exchanger of the installation.
Pump sizing should be carried out in ac-
cordance with a nominal flow that allows
an ∆t of 5°C.
It is convenient that the tubing connection
be carried out by means of antivibratory
couplings.
In all cases, a flow switch should be in-
stalled to avoid operation without water cir-
culation, as well as a water filter. These two
requirements are obligatory for application
of the warranty.
An expansion vessel should be installed in
the water return tubing. This vessel must be
adequate for the total water volume of the
installation.
Chiller water volume is as follows:
SIZE
42 = 25 litres 102 = 38.2 litres
62 = 28 litres 122 = 78.5 litres
82 = 38.2 litres 152 = 73.5 litres
During the winter season, with outdoor tem-
peratures below 0°C, precautions should
be taken to avoid the water from freezing
in the tubing networks and inside the chiller
exchanger.

Limits of use

Voltage
limits
Nominal
Model
400
Mín.
YLCC
342
YLCC-H
* At water temperatures below the nominal values, it is recommended to always use glycol type antifreeze mixtures.
16
EE
The following solutions are usually applied:
a) Always keep the circulator running.
b) Fill the circuit with an antifreeze mixture
(glycol).
c) Empty the circuit.
GH hydro kit
To avoid discomfort caused by a drop in
water temperature during the defrost cycle,
or the unit turning off due to the antifreeze
thermostat tripping in small volume instal-
lations, it is necessary to use a collector
tank to increase the thermal inertia of the
installation.
The water volumes of the GH hydro kits and
their compatibility with the YLCC/YLCC-H
chillers are as follows:
YLCC / YLCC-H
Nevertheless, check, in every case, the mini-
mum volume needed for the installation.

Circulating pump

For proper operation of the units it is es-
sential to select an adequate pump that
provides sufficient flow and pressure to the
hydraulic circuit. For this purpose, use the
data in the following table.
DB air inlet temperature
Operating cycle
at
Minimum °C
Máx. Cool / Heat
10 / -
436
10 / -10
LITRES
42 200
62 260
82 260
102 600 S
122 600 S
152 600 P
Water outlet temperature
to coil
Maximum °C Minimum °C
Cool / Heat Cool / Heat
46 / - 5* / -
46 / 20 5* / 30
GB
Approx. flow
of the pump
YLCC
∆t 5°C
YLCC-H
unit
l/h
42 6 700 1,86
62 10 100 2,8
82 13 500 3,75
102 17 200 4,77
122 19 900 5,53
152 25 800 7,16
Prior to final approval of the
installation
Check:
- That voltage is always between 342
- 436 V.
- That the power supply cable section
is at least equal to the section recom-
mended in the corresponding wiring
diagrams.
- - That operating instructions have been
given to the user.
- That information has been given on the
need to clean the air filter regularly.
- That the guarantee card has been
filled out.
- That maintenance instructions have
been given, or a periodical revision
contract has been signed.
Operating cycle
Maximum °C
Minimum
°C
Cool / Heat
15 / -
3
15 / 50
Minimum pressu-
re supplied by the
pump
l/s m c.d.a. kPa
15 147
15 147
15 147
15 147
15 147
15 147
Temp. differential
between the
water outlet and
intake
Maximum
°C
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