Troubleshooting; Recommended Maintenance Schedule; Control Box Maintenance; Condenser Coil Maintenance And Cleaning - Carrier AQUASNAP 30RAP010-150 Controls, Start-Up, Operation, Service, And Troubleshooting

MAINTENANCE
Recommended Maintenance Schedule —
lowing are only recommended guidelines. Jobsite conditions
may dictate that maintenance schedule is performed more often
than recommended.
Routine:
• Periodic clean water rinse, especially in coastal and
industrial applications.
• Check condenser coils for debris, clean as necessary.
Every month:
• Check moisture indicating sight glass for possible refrig-
erant loss and presence of moisture.
Every 3 months (for all machines):
• Check refrigerant charge.
• Check all refrigerant joints and valves for refrigerant
leaks, repair as necessary.
• Check chilled water flow switch operation.
• Check all condenser fans for proper operation.
• Check compressor oil level.
• Check crankcase heater operation if equipped.
Every 12 months (for all machines):
• Check all electrical connections, tighten as necessary.
• Inspect all contactors and relays, replace as necessary.
• Check accuracy of thermistors, replace if greater than
± 2° F (1.2° C) variance from calibrated thermometer.
• Check to be sure that the proper concentration of anti-
freeze is present in the chilled water loop, if applicable.
• Verify that the chilled water loop is properly treated.
• Check refrigerant filter driers for excessive pressure
drop, replace as necessary.
• Check chilled water strainers, clean as necessary.
• Check cooler heater operation, if equipped.
• Check condition of condenser fan blades and that they
are securely fastened to the motor shaft.
• Perform Service Test to confirm operation of all
components.
• Check for excessive cooler approach (Leaving Chilled
Water Temperature — Saturated Suction Temperature)
which may indicate fouling. Clean cooler vessel if
necessary.

Condenser Coil Maintenance and Cleaning

Recommendations

Routine cleaning of coil surfaces is essential to maintain
proper operation of the unit. See the following sections:
• MCHX condenser coils — See page 55.
• RTPF condenser coils — See page 55.
Control Box Maintenance —
30RAP100-150 208/230 v and 380 v units has two 24-v fans
installed at the right side of the panel to modulate the inside
temperature of the control box. These two fans are controlled
by a temperature switch. The temperature switch closes at 120
F and opens at 105 F. The inlet filter is located at the left side of
the control box. Inspect the inlet filter and fan outlet screen ev-
ery three months, clean as needed.

TROUBLESHOOTING

Complete Unit Stoppage and Restart —
ble causes for unit stoppage and reset methods are shown be-
low and in Table 35. Refer to Fig. 3-12B for component ar-
rangement and control wiring diagrams.
GENERAL POWER FAILURE — After power is restored,
restart is automatic through normal MBB start-up.
The fol-
The control panel for
Possi-
69

UNIT ENABLE-OFF-REMOTE CONTACT SWITCH IS

OFF — When the switch is OFF, the unit will stop immediate-
ly. Place the switch in the ENABLE position for local switch
control or in the REMOTE CONTACT position for control
through remote contact closure.
CHILLED FLUID PROOF-OF-FLOW SWITCH OPEN —
After the problem causing the loss of flow has been corrected,
reset is manual by resetting the alarm with the scrolling mar-
quee as shown in Table 36.
OPEN 24-V CONTROL CIRCUIT BREAKER(S) — De-
termine the cause of the failure and correct. Reset circuit break-
er(s). Restart is automatic after MBB start-up cycle is
complete.
COOLING LOAD SATISFIED — Unit shuts down when
cooling load has been satisfied. Unit restarts when required to
satisfy leaving fluid temperature set point.
THERMISTOR FAILURE — If a thermistor fails in either an
open or shorted condition, the unit will be shut down. Replace
EWT, LWT, or OAT as required. Unit restarts automatically,
but must be reset manually by resetting the alarm with the
scrolling marquee as shown in Table 36.
CAUTION
If unit stoppage occurs more than once as a result of any of
the safety devices listed, determine and correct cause
before attempting another restart.
LOW SATURATED SUCTION — Several conditions can
lead to low saturated suction alarms and the chiller controls
have several override modes built in which will attempt to keep
the chiller from shutting down. Low fluid flow, low refrigerant
charge and plugged filter driers are the main causes for this
condition. To avoid permanent damage and potential freezing
of the system, do NOT repeatedly reset these alert and/or alarm
conditions without identifying and correcting the cause(s).
COMPRESSOR SAFETIES — The 30RAP units with Com-
fortLink controls include a compressor protection board that
protects the operation of each of the compressors. Each board
senses the presence or absence of current to each compressor.
If there is a command for a compressor to run and there is
no current, then one of the following safeties or conditions
have turned the compressor off:
Compressor Overcurrent — All compressors have internal
line breaks or a motor protection device located in the com-
pressor electrical box.
Compressor Short Circuit — There will not be current if the
circuit breaker that provides short circuit protection has tripped.
Compressor Motor Over Temperature — The internal line-
break or over temperature switch has opened.
High-Pressure Switch Trip — The high pressure switch has
opened. Below are the factory settings for the fixed high pres-
sure switch.
CUTOUT
30RAP UNIT
SIZE
psig
010-090 650
ASTP Protection Trip — All non-digital Copeland compres-
sors are equipped with an advanced scroll temperature protec-
tion (ASTP). A label located above the terminal box identifies
models that contain this technology. See Fig. 45.
CUT-IN
kPa psig kPa
4482 500 3447