Quick Test 1 - Carrier HS070-160 Troubleshooting Manual

NOTE: The control does not detect circuit breaker
failures. If a circuit breaker trips on the lead compressor
in a circuit, a low oil pressure failure will be indicated;
on the other compressors, no failure will be indicated.
power to the unit. Turn on control power, then step
through the Quick Test to the proper compressor number
(i.e., failure code S3 is step CBT). Next, energize the
step. If the step works correctly, then the failure code
is due to:
. HPS open
l Ix-r
l
Ground wire and 24-volt feeds reversed on one or more
l
points on 2.t.3. The 24-volt ground wire (brown)jumps
terminals 2, 4, 6 and 8. Feeds from compressors Al,
A2, Bl and 82 connect to pins I, 3, 5 and 7.
The processor closes the contacts between 255 ter-
minals 12 and 1 I to start the
safeties shown to the right of 2.15 must be closed for
power to reach the compressor c<)ntroX
the feedback input (terminal t ~I"I 2,13).
Failure of power to terminal t OLI 2J3 when contacts
Terminal 2 on 293 is the other leg of the compressor Al
feedback channel. It is connected to the 24-volt ground.
Code 59 and 60, Loss of Refrigerant Charge ~ A loss-of-
charge switch is connected to the high-pressure side of
the refrigerant system. The microprocessor monitors this
switch directly; if it opens, all the compressors in the
circuit will be locked off, the alarm will be energized and
the display code will appear when the alarm display is
accessed. To reset, use the manual reset method (move
the RUN/STANDBY switch to STANDBY,
to RUN).
Following are some possible causes for this alarm:
charge is very low, the microprocessor will detect this
through the switch and indicate the error.
Failure - If the switch f&s open, the micro-
processor will detect this and indicate an error.
Wiring Error - If there is a wiring error that causes an
open circuit, the microprocessor wikk treat this as an open
switch and indicate an error.
cessor module fails in a manner that the switch cannot
be read properly, an error may be indicated.
Code 61, No Cooler
tains logic that prutects the cooler against loss of cooler
sensors are used for this purpose. The leaving thermistor
is located in the leaving water nozzle and the entering
sensor is located in the first cooler baffle space in close
proximity to the cooler tubes as shown in Fig. 4. When
there is no cooler water flow and the compressors are
operating, the leaving water temperature thermistor will
indicate no temperature change. But the temperature of
the entering water will drop rapidly and the entering
water thermistor will detect this. When the entering water
temperature drops to 5 F (2.8 C) below the leaving water
temperature,
no. 61 will be displayed. To correct, use manual reset
method (after cooler water Row is resumed).
The error will be caused either by no cooler flow or
if the water is flowing in the wrong direction through the
cooler or if the thermistors have been interchanged.
Fig. 3 - Compressor Al Control Wiring (Typical)
(See Fig. 3.) The
Code 63 and 64, Low Oil Pressure ~~ A low oil pressure
relay (CR 1) and
switch is installed on the lead compressor in each circuit.
If the switch opens during operation of the compressor,
all the compressors
light will be energized and the appropriate display code
shown. The switch will be bypassed for one minute during
start-up and for 45 seconds during normal operation. The
manual reset method must be used to reset this safety.
Possible causes for failure are:
psig (34.5 & 6.9 kpa), the switch will open.
indicated.
wiring Errur
open circuit, an error will occur.
then back
processor module fails in a manner that the switch cannot
be read properly, an error may be indicated.
Code 65, Cooler Freeze Protection ~ If the leaving water
temperature is below 35 F (1.7 C) for a water chiller or
is 6'F (3.3 C) below the set point for brine applications,
matically reset when the water temperature is 6 F (3.3 C)
above the set point.
Code 66 and 67, High Suction Superheat - The micro-
processor contains the following logrc and ifit is satisfied,
all the compressors in the circuit will be stopped:
saturated cooler suction is iess than 55 F (12.8 C) and
these 2 conditions have been true for more than5 minutes.
Causes
not allow the correct amount of refrigerant to be fed to
the evaporator, which will result in a high superheat.
becomes plugged, it can result in not enough refrigerant
being fed to the evaporator, which results in a high super-
heat failure.
the proper amount of refrigerant, the error will occur.
hardware that controls the EXVs fails, the valve
not move.
in
the circuit will be shut off, the alarm
Oil
The causes for this failure are usually due to low cooler
Suction superheat is greater than 75 F (4f.7 C), and
To reset this, use the manual reset method.
for this failure are:
Filter Drier - If the liquid line filter drier
will