The quick start guide does not replace
the HRP instruction manual!
Always check the full instructions before installation and operation!
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HRP quick start guide
Installation
Safety devices
Venting
Minimum flow
Start-up
Operation
Control system
Frequency converters
Check suction line size
Align HRP3232 in a vertical and HRP5040 to HRP10080 in a horizontal
position
Do not use flange bolts to align or “stretch” pipe, maintain a stress-free
installation.
Cable connection with loop (see photos)
Always install a current overload protections.
PTC resistor at connections # 1 and 2 must be connected with INT69.
A pressure differential switch is recommended and should be set with a
delay of 30s.
The downleg shut off valve must be open during stand-still to allow for pro-
per venting of the pump, or alternatively a vent line is required.
For each individual installed horizontal pump in CO
2
-systems, and when
the downleg is closed during stand-still (stand.by), a vent line is required
in front of the discharge check (see separate WITT instructions).
In CO
2
-systems a permanent open minimum flow line is required when it
is possible to operate against closed or throttled evaporators (separate
instructions available).
For all other refrigerants a differential set overflow valve has proven good
practice.
Provide sufficient time delay for venting/cool down prior to start up, so the
pump can reach evaporation temperature.
Check proper direction of rotation.
Check pump differential set overflow valve or minimum flow line.
Clean the conical filter within 2 weeks after start-up, and then in planned
intervals.
When the pump is stopped by a safety device re-start is only permitted
after investigation of the cause of stoppage.
The control system should include a low level refrigerant warning and
pump cut-out. For minimum allowed level see drawing above.
Pump starts-stops should be limited as much as possible. Minimum running
time is 5 min. After the pump has stopped sufficient time for venting must
be provided (20 min in CO
2
-systems without vent line, 5 min for all other
refrigerants and CO
2
-systems with vent line).
When using frequency converters the frequency should never be less than
40 Hz to ensure the minimum required refrigerant flow is maintained.
The start/stop ramp should be set steep enough, so the check valve on the
discharge side can open fast enough (from experience the ramp should be
set at 1s).
The orifice in CO
2
-systems has to be chosen for the max. possible frequency.
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