Check Starter - Before starting the 19DA, check
starter as follows:
1. Remove the contactor arc chutes. Be sure con
tactors move freely, and that shipping string
has been removed. Replace arc chutes.
2. If starter has been left on jobsite for a consid
erable period of time, check contactors for
dirt and rust. Clean contact magnet surfaces
with emery cloth. Apply a very thin coating
of vaseline to magnet surfaces, then wipe it
off. If starter has been in a dusty atmosphere,
vacuum clean starter cabinet and wipe with a
lint-free cloth.
3. Remove fluid cups from magnetic overload
relays. Add dashpot oil to cups per instructions
on relay nameplate. Dashpot oil is shipped in
small vials usually attached to starter frame
near relays. Use only the dashpot oil shipped
with starter. Do not substitute. Overload re
lays are factory set for 111 percent of motor
full load amperage and resetting is not nor
mally required.
4. Check transfer timer for proper time setting.
On Star-Delta starters, timers have adjust
able ranges of ten seconds to three minutes
and are factory set for one minute. On Auto-
Transformer starters, timers have adjustable
ranges of ten to forty seconds and are factory
set for thirty seconds.
5. With main disconnect switch open, manually
open and close main control relay (ICR) to be
sure it operates freely.
Charge Oil - Use oil shipped with the machine.
Any substitute must meet Carrier's oil specifica
tion outlined in 19DA Operation and Maintenance
Instructions.
Charge oil thru the oil reservoir charging
valve (Fig. 1). With machine at vacuum, oil is
drawn from the oil container. Continue charging
until oil reaches middle of sight glass (Fig. 1).
CAUTION: After charging oil, energize the
oil heater to minimize absorption of refrig
erant by the oil. The oil heater indicator light
(Fig. 1) comes on when heater is energized.
Set oil heater thermostat (Fig. 1) to maintain s
a minimum oil reservoir temperature of 145 F i
at shutdown.
Charging Refrigerant - To charge the 19DA ma
chine, proceed as follows:
1. Install a charging valve on the 3/4-inch drum
opening as shown in Fig. 3. When the 3/4-inch
pipe nipple is screwed into the drum opening,
the nipple forces the bottle cap off its seat.
2. Connect a short piece of clear plastic hose or
copper tubing from drum valve to cooler charg
ing valve located beneath float chamber.
3/4 GLOBE
VALVE
5/8"SAE FLARE x
3/4"MPT ADAPTER
Fig. 3 - Drum Charging Valve and Fitting
3. Start chilled water pump and circulate chilled
water during charging process.
4. If machine pressure is eighteen inches of mer
cury (32 F) vacuum or lower, keep refrigerant
drum upright, open valves and admit refrig
erant gas to cooler. The machine under vacuum
will boil off liquid refrigerant, and raise ma
chine pressure, preventing possible freeze-up.
5. Charge the machine with the proper quantity
of refrigerant for the machine size given on
a tag attached to the cooler charging valve
(Fig. 1) or in Table 1.
NOTE: The refrigerant supplied v/ith this ?
machine is in excess of that required for ^
initial charging. Use the correct amount as
shown in T^>ie 1.
The machine under vacuum will draw refrig
erant from the drum.
6. After machine has been started, it may be
necessary to adjust refrigerant charge for
optimum machine performance.
NOTE: Refer to "Trimming Refrigerant
Charge” (pg II) for full load adjustment.
Table 1 - Charging Quantity
MACHINE
CHARGING
MACHINE
CHARGING
SIZE WT (lbs) SIZE
WT (lbs)
19DA-102
400
19DA-228
575
19DA-112 400
19DA-255
850
19DA-131
425
19DA-284
880
19DA-147 450
19DA-325
900
19DA-160 525 19DA-362
935
19DA-182 550 19DA-397
960
19DA-198 575
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