Maintenance; Recommended Maintenance Schedule; Microchannel Heat Exchanger (Mchx); Recommendations - Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

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.
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.
Microchannel Heat Exchanger (MCHX) Con-
denser Coil Maintenance

Recommendations

CAUTION
Do not apply any chemical cleaners to MCHX condenser
coils. These cleaners can accelerate corrosion and damage
the coil.
Routine cleaning of coil surfaces is essential to maintain
proper operation of the unit. Elimination of contamination and
removal of harmful residues will greatly increase the life of the
coil and extend the life of the unit. The following steps should
be taken to clean MCHX condenser coils:
1. Remove any foreign objects or debris attached to the
coreface or trapped within the mounting frame and
brackets.
2. Put on personal protective equipment including safety
glasses and/or face shield, waterproof clothing and
gloves. It is recommended to use full coverage clothing.
3. Start high pressure water sprayer and purge any soap or
industrial cleaners from sprayer before cleaning condens-
er coils. Only clean, potable water is authorized for clean-
ing condenser coils.
4. Clean condenser face by spraying the core steady and
uniformly from top to bottom while directing the spray
straight toward the core. Do not exceed 900 psig or
The fol-
and Cleaning
65
30 degree angle. The nozzle must be at least 12 in. from
the core face. Reduce pressure and use caution to prevent
damage to air centers.
CAUTION
Excessive water pressure will fracture the braze between
air centers and refrigerant tubes.
Control Box Maintenance —
30RAP100-150 units has two 24-v fans installed at the right
side of the panel to modulate the inside temperature of the con-
trol 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 every 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 33. 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.

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 34.
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 34.
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.
The control panel for
Possi-