9
14_09. 5641250_01
NRL free cooling 0280-0750 60Hz
EN
4.
OPERATING LIMITS
Note:
1 - In summer mode the unit can be started
with external air 46°C/114,8°F and water inlet
35°C/95°F. In winter mode the unit can be started
with external air -15°C/5°F and water inlet
20°C/68°F. Operate in such conditions is permit
-
ted only for a short time and to bring the system
up to temperature. To reduce the time of this
operation, it is recommended to install a three-
way valve that allows bypassing water from the
system utilities, until the conditions that allow
the unit to work within the permitted operation
limits are achieved.
The devices in their standard configurations are not
suitable for installation in salty environments.
For
the operating limits, refer to diagram, valid for
AHRI
standard conditions.
Wind breaks should be implemented if the unit is
installed in particularly windy areas, to prevent a
malfunction of the unit.
4.1.
DESIGN SPECIFICATIONS
ATTENTION
Contact our technical sales depart-
ment if the unit needs to operated
outside the operating limits.
ATTENTION
When the unit is installed in particularly
windy areas, we recommend installing
wind barriers if wind speed exceeds 2.5 m/s”
REFRIGERANT SIDE
High pressure
side
Low pressure
side
Acceptable maximum pressure
bar/PSI
45/653
30/435
Acceptable maximum temperature
°C / °F
120 / 257
51 / 131
Acceptable minimum temperature
°C / °F
-30 /- 22
-30 / -22
WATER SIDE
Acceptable maximum pressure
bar/PSI
6/87
Hydarulic circuit safety valve
(only in version with storage tank or with pump)
Calibrated at 6/87 bar/PSI and with piped discharge, which intervents
by discharging overpressure if abnormal work pressure occur.
Ex
ternal air t
emper
atur
e b.s.
Temperature of the water produced EVAPORATOR
Thermostatic valve °
Thermostatic valve Y
Thermostatic valve X
5
14
23
32
41
50
59
68
77
86
95
104
113
114,8 °F
46 °C
36 °C
96,8 °F
122
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
°C
°C
°F
°F
-6
-7
-8
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
17,6
19,4
21,2
23,0
24,8
26,6
28,4
30,2
32,0
33,8
35,6
37,4
39,2
41,0
42,8
44,6
46,4
48,2
50,0 51,8
53,6
55,4
57,2
59,0
60,8
62,6
64,4
66,2
68,0
STANDARD
functioning
Functioning only with "I" funs
Functioning with
glycoled water
Functioning only with "I"
funs
+
water glycoled