Water used to fill the circuit may have to be
treated to ensure that the pH value is correct.
When two or more units are connected in parallel it is
recommended that the connections are made through a
“Reverse Return” circuit (see below) in order to balance
the pressure drop in each unit circuit.
Key
S
Gate valves
VG Regulating valves
Standard evaporators provided on YCAA units are
designed to chill mixtures of water and ethylene glycol
with a corrosion-inhibiting additive down to -10°C (R22)
and -8°C (R407C).
The amount of ethylene glycol to be added is as follows.
Amounts are shown as a percentage by weight of the
circuit design water content:
Operation from + 5 to 0°C : 20%
Operation from 0 to -5°C : 30%
Operation from -5 to -10°C : 40%
4.5
Water connections
The water inlet and outlet connections must
be connected correctly as shown on the labels
fitted next to the fittings.
Connect the external water supply lines to the water inlet
and outlet fittings at rear of the unit, refer to section 9 for
diameters and locations.
4.6
Hydro Kit Connection (Option)
The hydro kit can be field mounted directly to the water
inlet and outlet of the unit (models 60 - 150) or located
remotely (all models). Refer to Installation,
Commissioning, Operation and Maintenance manual
supplied with the kit for details.
(09/03)
035B09012-100 Rev. 4
4
-
3
S
S
VG
VG
S
S
UNIT 1
UNIT 2
YCAA
HYDRO KIT
(CHILLER SIDE)
HYDRO KIT
(SYSTEM SIDE)
FILL
LOAD
DRAIN
Summary of Contents for YCAA B 120
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