3
Operating Range
3 -- 1
Liebert HPC---S 006---022---PD---273571---01.03.2012
Operating Range
Working Limits
Minimum temperature of outdoor air entering condenser coils (with standard operating unit):
---25 ° C for Freecooling models;
---10 ° C for Chiller models.
Maximum outdoor air temperature is in relation to each model, as indicated in the following tables.
High water flow values (corresponding to a thermal difference at the evaporator lower than 3.5° C --- 4° C)
may cause corrosions and vibrations inside the plate heat exchanger and in the hydraulic circuit.
The Minimum water flow allowed corresponds to a maximum temperature difference of 8° C.
More extreme operating conditions would active safety devices and the unit would be stopped.
The outlet water temperature must range from 4° C to 15° C.
The maximum allowed water return temperature, when the unit is in full operation, is 20° C; return temper-
atures over 20° C are allowed only during start---up.
The “G” version with EC fans 900mm (digit 11 = C) admit Maximum Outlet Water Temperature of 20 ° C
and Maximum Water Return Temperature of 26° C when the units are at full power.
The maximum permitted glycol percentage is 50% (35% with standard pump groups fitted).
The necessary minimum glycol percentage depends on the minimum ambient air temperature condi-
tions referred to the place of installation.
The maximum hydraulic working pressure is 6 barg (safety valve set at 6 barg, optional).
Nominal power supply tolerance: 400V
+
/
---
10%; max. voltage unbalance: 2%.
See “Operation range” table reporting the limits for each model; for different values ask your agent.
All the working limits indicated in both diagrams and tables refer to steady---state operation mode.
Unit storage conditions:
D
between ---10 ° C and + 45 ° C for all models; humidity: 80% R.H. non-condensing.
60
Average HPC---S 006---022 Working Limits
Ambient Temperature (
_
C)
LW
T
(
_
C)
25
55
50
45
40
35
30
25
20
15
10
5
0
---5
---10
---15
---20
---25
---30
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Only
G models
All models
Freecooling
only
G models
Freecooling
only
All models
This diagram shows the average working limits of all the products family.
Refer to table 3 for the working limits of each unit.
Summary of Contents for HPC-S 006
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