Carrier 19DA - Manual (Page 4)

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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