Chapter 5 Water Connections 25
Liebert.CRV Series Air Conditioner User Manual
Chapter 5 Water Connections
This chapter introduces water connections of the Liebert.CRV air conditioner, including general warning, water
connections, chilled water connections for water/glycol-cooled (W) units and chilled water (C) units.
The options for water connections are listed in Table 5-1.
Table 5-1 Options for water connections
Options
Top connections
Down connections
Condensate pump
Available choice
Available choice
Nothing (drain only)
No
Single choice
Condensate pump must be selected and used for top connection of water pipes of the unit. Top connections: ‘e’ in
Figure 5-1 is the position of supply and drain water connection for all types unit. ‘f’ is the position of supply and drain
water connection for the chilled water (C unit) or cooling water (W unit).
f
e
Figure 5-1 Supply and drain water connection
5.1 General Warning
If the tubing is to run outdoors, add glycol to the circuit as described in Table 5-2.
Table 5-2 Glycol to be added to water
Item
Percentage in weight of total mixture added to water
0%
10%
20%
30%
40%
Freezing
temperature
Glycol*
0°C
-5°C
-11°C
-18°C
-27°C
Propylene glycol
0°C
-3°C
-7°C
-14°C
-
Note*:
Values are for Shell antifreeze 402. For different brands check manufacturer’s data
Notes:
To avoid stratification run the circulation pump for at least 30min. after adding any glycol.
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.
After any topping-up of water check the glycol concentration and add any glycol if necessary.
The hydraulic features of the system vary by adding glycol. Therefore check the head and the flow rate of the
pump to be used.
