Witt HRP Series User manual

HRP
h
ermeti
c
refrigerant pump
quick start guide

2
Installation
Check the approved dimensions of the suction line.
Align the HRP 3232, 5050 90 and 8050 90 exactly vertically.
Align the HRP 5040 to 10080 up to 40bar exactly horizontally.
Connect the pump stress free. Do not use the flange screws to align or stretch the
piping.
Connect the cables with a loop (see photos on the back).
Safety devices
The overload protection device must always be connected.
Connect the temperature protection (PTC) at terminals 1 and 2 to the INT69.
A differential pressure switch is recommended. The time delay should be set to 30s.
Venting
The shut off valve in the suction line must be open during standstill, in order to allow
the pump to vent. If this is not possible, a vent line must be installed.
For horizontal HRP models in CO
2
refrigeration systems, as well as when the suction
shut off valve is closed during standstill, one degassing line per refrigerant pump must
always be installed upstream of the pressure side non return valve. (see separate
WITT information).
Minimum flow line
In CO2 refrigeration systems, a permanently open minimum flow line is required if the
control system permits operation against closed or heavily throttled evaporators (see
separate WITT information).
For all other refrigerants, a differential set overflow valve has proven effective.
ommissioning
Provide sufficient time for the refrigerant pump to cool down / vent so that the
evaporating temperature T
0
is approximately reached.
Check the proper direction of rotation of the refrigerant pump.
Check the settings of the differential pressure Pressostat and minimum flow line.
Operation
Clean the conical filter after 2 weeks after commissioning at the latest and then at
regular intervals, depending on the degree of contamination.
If the refrigerant pump has been switched off by a safety device, the cause must be
identified and documented before restarting.
ontrol system
The control system should include a warning and switch off the refrigerant pump if the
refrigerant level in the separator falls below the minimum level (see page 2).
Do not switch the refrigerant pump on and off frequently. Observe a minimum running
time of 5 minutes.
Allow sufficient venting time after switching off the refrigerant pump (20 min for CO
2
refrigeration systems without vent line, approx. 5 minutes in all other cases).
Frequency converters
Do not use frequency converters below 40 Hz to ensure that the minimum volume flow
is maintained.
Select a steep start up/shut down ramp so that the check valve in the discharge line
opens quickly enough (a setting of 1 sec. has been proven).
The orifice in CO
2
refrigeration systems must be designed for the max. possible
frequency.
HINWEIS
The quick start guide is not a substitute for the operating manual.
It is essential to observe the complete operating manual for installation and commissioning.

3
Necessary suction line
Ø
Required minimum flow
Orifice for
O
2
HRP
DN
inch
50 Hz
60 Hz
HRP
Frequen
cy
Part
-
N
o
.
50 Hz
60 Hz
m3/h
gal/min
m3/h
gal/min
3232
50 Hz
4.419.020.104
3232
80
3
0,6
2.6
0,7
3.1
60 Hz
4.419.020.114
5040
100
5
1,2
5.3
1,5
6.6
5050
50 Hz
4.419.020.103
5050
125
5
3
13.2
3,5
15.4
60 Hz
4.419.020.113
8050
150
8
5
22
5,5
24
8050
50 Hz
4.419.020.101
10080
250
10
8
35
9,6
42
60 Hz
4.419.020.111
10080
50 Hz
4.419.020.102
60 Hz
4.419.020.112
Setting of the differential operated
overflow valve
(required when the required minimum flow into the system cannot be maintained at all times)
50 Hz, 4 x 400V
60 Hz, 3 x 460V
Set point
Δ p
t0 NH3 R404 a / R507 R134 a NH3 R404 a / R507 R134 a
°
°F
[bar]
[psi]
[bar]
[psi]
[bar]
[psi]
[bar]
[psi]
[bar]
[psi]
[bar]
[psi]
HRP 3232
0
32
1,6
22
2,8
41
3,1
22
2,5
36
4,5
65
5
73
1
0
14
1,6
23
2,9
42
3,2
47
2,5
37
4,6
68
5,2
76
4
0
40
1,7
24
3,1
45
3,4
50
2,7
39
5
73
5,5
80
HRP 5040
0
32
1,9
27
3,4
49
3,8
55
2,8
40
5,1
73
5,7
83
10
14
1,9
28
3,4
51
3,9
56
2,8
42
5,2
76
5,8
85
4
0
40
2
29
3,7
54
4,1
60
3
44
5,6
82
6,2
90
HRP
5050
0
32
2,8
41
5,1
73
5,7
82
3,7
54
6,7
98
7,6
110
HRP 8050
10
14
2,8
42
5,2
76
5,8
85
3,8
56
7
102
7,8
114
HRP 100
80
40
40
3
44
5,6
82
6,2
90
4
59
7,5
109
8,3
120
Settings for different/lower evaporating temperatures, please have a look in the WITT manual.
Required nut torque
Nut size Torque
M12 85 Nm
M16 210 Nm

TH. WITT Kältemaschinenfabrik GmbH
Lukasstraße 32
52070 Aachen
[phone] | [e-mail]