Pumpout System Operation; Lubrication; Control Description; Control Setting - Carrier 17DA Start-Up, Operation And Maintenance Instructions Manual

2. If the machine will be exposed to freezing temperatures,
drain all water from cooler and condenser. Blow out oil
cooler lines to remove all traces of water. Leave water
box drains open until time to refill.
3. Deenergize the drive controls and refrigeration machine
control panels.
4. If refrigerant charge is to be left in machine, the shutdown
seal bleed valve must be left open to seal off the refriger-
ant side of machine. Best practice is to remove liquid re-
frigerant and pump vapor pressure down to be equal with
atmospheric pressure.
5. Protect drive equipment as outlined in drive manufactur-
er's instructions. Before putting machine back into opera-
tion after an extended shutdown period, it may be wise to
flush condenser and cooler water circuits with clean wa-
ter to remove soft rust which may have formed.
Pumpout System Operation —
tem operation permits transfer of refrigerant (liquid or gas)
from cooler to storage tank (or reverse). It can also be used for
machine evacuation and removal of contaminants.
Machines not containing refrigerant may be pressurized
with the pumpout unit. Since the pressurizing agent is unproc-
essed air, some moisture and contaminants can be introduced to
the machine by this method. Pressurizing with dry air or nitro-
gen is recommended. Procedures are based on typical piping
arrangements. See Fig. 4 for a typical piping schematic and
valve number designations.
The system consists of storage tank, pumpout compressor,
condenser, valves, and piping. Liquid refrigerant drains by
gravity if storage tank is below cooler. If tank is above cooler,
liquid is forced up by compressed refrigerant gas pressure. Gas
remaining in cooler is pumped out, condensed, and passed
through a high-pressure trap into the tank. Pressures may then
be equalized, by valve adjustment, permitting gravity flow of
refrigerant in opposite direction.
Compressor must rotate per arrow on crankcase for proper

lubrication.

NOTE: Numbers in schematic correspond to valve numbers in Pumpout System
Operation section and are used in conjuction with the tables and text to specify which
valves should be open and closed.
The pumpout sys-
Fig. 4 — Pumpout System Schematic
11
LUBRICATION — Pumpout
charged with oil. The 5F20 open-drive is charged with 5 pints
plus 1 pint for the oil separator. Use Carrier oil part no.
PP23BZ103-001. This is a one gallon container. The oil level
should be at the center of the sight glass when the compressor
is not running. Always check the oil level before operating the
compressor.
CONTROL DESCRIPTION — The
equipped with a low pressure safety, a high pressure safety, and
a time delay low oil pressure safety.
CONTROL SETTING — Set the safety switches using a me-
tered air supply. The high-pressure switch setting can be
checked by operating the pumpout compressor while throttling
the pumpout condenser water. Exercise care when performing
the check in this manner. Watch the discharge pumpout dis-
charge pressure gage to prevent exceeding the specified cutout
pressure.
Safety Device
Low Oil Pressure
Low Suction Pressure
High Discharge Pressure
The pumpout compressor is operated by a ON-OFF-AUTO
switch. The AUTO position enables the Low Suction Pressure
switch. This position is used to prevent a freeze-up when ap-
plying suction to a heat exchanger containing liquid refrigerant.
Otherwise, the ON position is used.
MACHINE AND STORAGE TANK EVACUATION (No
Refrigerant in System) — Perform the following procedure.
See Fig. 4 for valve numbers.
1. Place the control switch in the OFF position.
2. Close valves 2, 4, 9, 10, and 13.
3. Open valves 1, 3, 5, 6, 7, 8, 11, and 12.
Valve 1 2 3 4
Condition O C O C O O O O C
compressors are factory
pumpout unit
Setting
14 psig (96 kPa)
31 psig (214 kPa)
165 psig (448 kPa)
5 6 7 8 9 10 11 12
C O O
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is
13
C