on relay nameplate. 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 relays are factory
set for 108 percent of motor full load amper
age. Resetting is not normally required.
4. Check transfer timer for proper time setting.
On Star-Delta starters, timers have adjustable
ranges of 10 seconds to 3 minutes and are
factory set for one minute. On Auto-
Transformer starters, timers have adjustable
ranges of 0 to 60 seconds and are factory set
for 30 seconds.
5. With main disconnect switch open, manually
open and close main control relay (ICR) to be
sure it operates freely.
Oil Charge is shipped in the oil reservoir. Check
sight glass (14) to be certain oil is visible. If oil
must be added, it must meet Carrier’s oil specifi
cation. Charge oil thru the oil reservoir charging
valve (19). Use a hand pump to charge the oil
against machine pressure.
Oil Heater — Energize the oil heater to minimize
absorption of refrigerant by the oil. A light (16)
indicates when the heater is energized. Set the oil
heater thermostat to maintain a minimum
temperature of 145 F at shutdown.
Refrigerant Charge is shipped in the utility vessel.
If refrigerant must be added, charge it thru the
refrigerant charging valve (6).
WARNING; Never charge liquid refrigerant into
the unjshell if the pressure is helow 35 psig.
Bek>w 35 psig, R-12 will flash to a gas at a
temperature heiow the freezing pomt of water.
With cooler and condenser water fiownng,
charge the refrigerant as a gas tmiil the vessel
pressure is above 35 psig.
Refer to Trimming Refrigerant Charge for full
load adjustment.
Check Operation of Safety Controls — As the
following checks are made, the panel lights
should appear as shown in the diagrams.
CONTROL LIGHTS
□ -OFF
■
l-ON
□
□ □
□ □
■
ON-STOP
□
□ □
□ □ □
START
□ □
■
□
□
□
OIL PUMP
□
■ ■
■ ■
■
POWER
□ □
□
□ □
■
SAFETY CIRCUIT
□ □ □
□
□ ■
LOAD RECYCLE
□
□
□ □
□ □
PROGRAM TIMER
1
2
3A
3B 4 5
(SEE BELOW)
STEP
1. Disconnect main motor leads in starter.
2. Energize the control circuit.
3a. With water pumps off, press oil pump button
for several seconds to determine oil pressure
on differential gage. With pump running,
confirm that circuit between terminals
<Q> and ^ is closed by using an
ohmmeter.
b. Release the oil pump button. Circuit between
terminals ^ and must open.
4. Start the chilled water and condenser water
pumps. Confirm that circuit between terminals
and is closed with pumps run
ning, and opens when pumps stop and flow
switches open.
5. Press ON-STOP button. If safety circuit light is
off, check resets on the condenser high-
pressure safety, cooler low-pressure safety,
bearing and motor high-temperature circuit
breakers and compressor motor overloads in
starter. Check 3-amp fuse in control center. If
safety circuit light is on but load recycle light
is off, check the automatic resetting chilled
water recycle switch. If both lights are on,
manually trip and then reset bearing and
motor high-temperature circuit breakers and
compressor motor overloads to be sure they
cut off the safety light. Tripping the chilled
water recycle switch will cut off the load
recycle light only.
CONTROL LIGHTS
□ -OFF B-ON
N
■
■
m
■
■
□
□
□
■
□
□
■
■
■
■
■
■
□
■
■
■
□
■
■
□
\m
□
ON-STOP
START
OIL PUMP
POWER
SAFETY CIRCUIT
LOAD RECYCLE
PROGRAM TIMER
STEP
6A 6B 6C
8 {SEE BELOW)
6a. Press machine START button. (Motor leads
disconnected and water pumps running.)
b. Oil pump starts within 30 seconds.
c. Compressor motor start contacts will close 30
seconds later. Starter will transfer to its run
condition 30 to 60 seconds after starter is
energized.
7. Open the oil pump main disconnect. Starter
must de-energize. Close disconnect.
8. In approximately 15 minutes, the program
timer will complete the antirecycle portion of
its cycle and the machine may be started.
9. Open circuit breaker and reconnect main
motor leads.
START-UP
Preliminary Checks
1. Power on to main circuit breaker, control
circuit, water pumps and tower fan.
2. Cooling tower water level.
3. Oil reservoir level and refrigerant level.
4. Oil reservoir temperature 145 F or warmer.
5. All isolation valves open. See (27), (28), (29)
and (30) of Fig. 1. If valves are closed, follow
isolation valve procedure on page 3.
6. Oil cooler plug cock, (36) Fig. 1, cracked open,
and any other valves in oil cooler line fully
open.
