Hydraulic Connections; Limits Of Use - Johnson Controls YORK YLCC-42 Instrucciones De Instalación

Hydraulic connections

The hydraulic connections of the water
intake and outlet of the chiller should be
carried 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
accordance with a nominal flow that allows
an Δt 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 installed
to avoid operation without water circulation,
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
152 = 73,5 litres
82 = 38,2 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 ex-
changer.

Limits of use

Voltage
limits
Nominal
Model
at
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
installations, 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
42
62
82
102
122
152
Nevertheless, check, in every case, the mini-
mum volume needed for the installation.
Circulating pump
For proper operation of the units it is
essential 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
to coil
Operating cycle
Minimum °C
Máx. Cool / Heat
10 / -
436
10 / -10
LITRES
200
260
260
600 S
600 S
600 P
Water outlet temperature
Operating cycle
Maximum °C Minimum °C
Cool / Heat Cool / Heat
46 / - 5* / -
46 / 20 5* / 30
GB
Approx. flow
of the pump
YLCC
Δt 5°C
YLCC-H
unit
l/h l/s
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 or
342 -436 V.
- That the power supply cable
section is at least equal to the
section recommended 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.
Temp. differential
between the water
outlet and
intake
Maximum °C
Minimum
°C
Cool / Heat
15 / -
3
15 / 50
Minimum pressure
supplied by the
pump
m c.d.a. kPa
15 147
15 147
15 147
15 147
15 147
15 147
Maximum
°C
7