070.750-IOM2 (JAN 21)
Page 13
HPS 273 ROTARY SCREW COMPRESSOR
OPERATION
Operation
Initial start-up
Before the start-up, complete the prestart check. See the
section for the
.
Initial start-up procedure
After performing the prestart check, the compressor unit
is ready for start-up. In low ambient conditions, have oil
heaters and heating wires on for 24 h before start-up. It is
important that an adequate gas load be available to load
test the unit at normal operating conditions. Keep the fol-
lowing points in mind during initial start-up:
1. For proper and safe operation, run the compressor at
the proper speed and discharge pressure. At any speed,
exceeding design conditions creates a potential hazard.
2. Immediately after start-up, adjust the oil cooling
system. After 1 h to 3 h, adjust it again after operating
conditions are within expected parameters.
3. Pull and clean suction strainer after 24 h of operation.
If it is excessively dirty, repeat every 24 h until the
system is clean. Otherwise, follow the normal mainte-
nance schedule.
4. Perform vibration analysis if preventive maintenance is
required. If performing a vibration analysis, it is neces-
sary to establish a baseline when the system is running
at normal conditions.
Normal start-up procedure
1.
Confirm system conditions permit starting the com
-
pressor.
Notice
Ambient temperatures need to be high enough to
prevent excessive condensing; otherwise, initiate oil
heaters and heat tracing 24 h before start-up.
2. Start the unit.
3. Observe the compressor unit for mechanical tight-
ness of the external piping, bolts, and valves. Ensure
that the machine has no oil and vapor leaks. If any of
these occur, shut down the compressor and correct the
problem as necessary using good safety precautions.
Control system
The HPS compressor and package requires a dedicated
control system, either Quantum or UNISAB. For details on
operation of these control systems, refer to the respective
IOM manuals.
Operation and start-up instructions
The Frick HPS 273 Rotary Screw Compressor is a com-
ponent in an integrated system. As such, the compressor
operation requires some specific conditions to ensure
trouble-free running.
The information in this section provides logical step by
step instructions to properly start up and operate the HPS
Rotary Screw Compressor in your unit. Only matters which
may influence the proper operation of the Frick HPS 273
compressor are included.
Note:
You must read the following subsections and ensure
you understand the information before attempting
to start or operate the unit.
Low ambient operation
Warning
Everything must be heat traced and insulated, even the
compressor.
Insulate the package oil separators, the oil piping, and the
oil filter as a minimum requirement. This can preserve the
heat generated by the oil heaters, prevent condensation,
and secure lubrication at start-up.
Always insulate the oil separator for heat pump and fuel
gas compression applications. It is often necessary to
insulate the complete suction line for heat pumps in order
to prevent condensation and possible slugging. In these
cases, heating wires are necessary.
With an automated valve, regulate oil flow to the main
oil port being used (SM-2 or SM-1) in order to continu-
ously achieve the highest possible discharge temperature
needed.
