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English
Liebert HPM --- A/W/F/D/H
S The required water flow at different temperatures is given
in our catalogues or on request.
S If necessary (very low water temperature) insulate both
pipes using Armaflex insulation.
5.4.2 --- Notes for closed circuit applications
S The installation in Fig. e is indicat ive only; for individual
installations follow the project diagram.
S Install a pump system calculated on the basis of the
flow and total head of the system (see project data), and
controlled by the compressor running (see label on
the unit).
S Insulate both pipes using Armaflex insulation.
S VERY IMPORTANT: Add water and ethyleneglycol tothe
circuit, when the ambient temperature is below zero (re-
ferring also to para. 5.5). Do not exceed the nominal op-
erating pressure of the circuit components.
S Bleed air out of the circuit.
5.5 -- Adding ethylene glycol
Tab. f --- Ethylene glycol to be added to water
freezing temperature
(_C)
0 --- 5 --- 1 1 --- 1 8 --- 2 7 --- 3 9
ethylene glycol to add
to water (% in weight of
total mixture)
0 10 20 30 40 50
N.B. Values are for Shell antifreeze 402. Fo r different brands
check manufacturer’s data.
NOTES:
S To avoid stratification run the circulation pump for at least
30 min. after adding any glycol.
S After adding water to the water circuit, disconnect the
unit from the sanitary water piping system; in this way
the water mixed with glycol won’t return into the same
piping system.
S After any topping---up of water check the glycol concen-
tration and add any glycol if necessary.
S The hydraulic features of the system vary by adding
glycol. Therefore check the head and the flow rate of the
pump to be used.
Fig. e --- Advised Dry cooler Installation
APPLIANCE
TSHTC
Stand ---by pump
disconnect
after charge
filling
water
(optional)
HTC
TS
shut ---off valve
pump
non---return valve
manometer
thermostat
Variex (opt.)
safety valve
expansion tank
air separator
charge group (filter,
reducer, non---return valve)
filling meter
drain (at lowest point)
}(*)
Stand ---by pump
p r e s s u r e --- o p e r a t e d b y --- p a s s
See hydraulic drawings in the Enclosures D.
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