Liebert himod - Water Connections; General Warnings; Auxiliary Water Connections; Chilled Water Connections

English
8
HIMOD−C
4 − Water connections
4.1 − General warnings
ENSURE THAT THE TUBING DOES NOT OB-
STRUCT THE AIR FLOW(Under only).
IF THE TUBING IS TO RUN OUTDOORS, ADD
ETHYLENE GLYCOL TO THE CIRCUIT AS DE-
SCRIBED IN PARA. 4.4.
4.2 − Auxiliary water connections
− Condensate drain (Fig. 1):
S Use galvanized steel, PVC or flexible polythene
tubing.
S Allow a 2% gradient towards the drain outlet.
S There must be a drain trap (1) placed at least 30
mm below the drain tray (2).
S Fill the drain trap with water (3).
Fig. 1 − Condensate drain
BRACKET
to be
connected
by user
2
3
min.
30 mm
1
− Humidifier (optional): See App. A.
− Hot water (optional):
S Use copper or steel (Mannesmann) tubing.
S Insulate both tubes using Armaflex insulation.
4.3 − Chilled water connections
S Use copper or steel (Mannesmann) tubing.
S Place the tubing on supporting saddles (1).
S Insulate both tubes using Armaflex insulation (2).
S Place shut−off ball valves (3) at the conditioner in-
let and outlet to allow easy maintenance.
S It is useful to install a thermometer (4) and a ma-
nometer (5) at the conditioner inlet and outlet.
S Install a water drain tap (6) at the lowest point in
the circuit.
S Place a control valve (7) in the outlet water tubing.
S Fill the circuit with water/glycol (see below), up to
a maximum pressure of 7 bar.
Fig. 2 − Chilled water circuit
Air
1 6
7 3
4 5
2
conditioner
4.4 − Adding ethylene glycol
Tab. 2 − Ethylene glycol to be added to water
freezing temperature
(_C)
0 −5 −11 −18 −27 −39
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. For 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
concentration 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.