CXRC-SVX01J-EN
29
Annual Maintenance Checklist
☐ Perform all monthly maintenance inspections.
☐ Perform seasonal start up checks.
☐ Leak test refrigerant circuits. Inspect contacts of fan motor
contactors and relays. Replace all worn contacts.
☐ Clean condenser fans. Check fan assemblies for proper
orifice clearance, abnormal end play, and excessive
vibration or noise. Fan motor bearings are permanently
lubricated and do not require lubrication.
☐ Have a qualified service technician check condenser fan
pressure switches for proper operation (thermostat
controlled unit only).
☐ Clean and repaint any corroded surface.
Cleaning the Coil
Clean the coil at least annually, or more frequently if
located in a dirty environment, to help maintain proper
unit operating efficiency. High discharge pressures are
a good indication that the coil needs cleaning. Follow
the detergent manufacturer instructions as closely as
possible to avoid potential damage to the coil.
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To clean the refrigerant coil, use a soft brush and
sprayer, such as a garden pump up or high pressure
type. In addition, use a quality detergent; like SPREX
AC, OAKITE 161 or OAKITE 166 and COILOX.
NNoottee:: If detergent is strongly alkaline (i.e. has a pH
value greater that 8.5) after mixing, an aluminum
corrosion inhibitor must be added.
Coil Cleaning Procedure
1. Disconnect power to the unit.
2. Remove enough panels and components from the
unit to gain access to the coil.
3. Use a soft brush to remove loose dirt and debris
form both sides of the coil.
4. Straighten coil fins with fin comb as required.
5. Mix the detergent with water according to the
manufacturers instructions.
NNoottee:: Observe all recommendations of the cleanser
manufacturer. The coil cleanser manufacturer’s
recommendations, warnings and cautions will at
all times take precedence to these instructions.
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6. Place solution in the sprayer. Use the following
guidelines if using a high-pressure sprayer:
• Minimum nozzle spray angle is 15°.
1.
2. Spray solution at 90° to the coil face.
3. Keep sprayer nozzle at least six inches form the
coil.
4. Sprayer pressure must not exceed 600 psi.
7. Spray leaving air side of the coil first then spray the
entering air side of the coil. Allow the detergent and
water solution to stand on the coil for five minutes.
8. Rinse both sides of the coil with cool, clean water.
9. Inspect the coil. If it still appears dirty, repeat the
cleaning procedure.
10. Reinstall all unit components and panels, and
restore electrical power to the unit.
Low Ambient Damper Adjustment
DDC Controlled Units
Inspect damper blade for proper alignment and
operation. Dampers should be fully closed when
positioning signal from controller is 2 volts DC and
should be fully open when positioning signal from
controller is 10 volts DC. To adjust position remove
VDC signal from actuator and check dampers to ensure
full closure. Check the 90% position open by applying a
9-volt battery to the positioning signal. Dampers
should stroke 90% open when 9 VDC is applied to the
positioning signal inputs.
Thermostat Controlled Units
The same procedure can be used to inspect the
operation of the low ambient dampers on the
thermostat-controlled unit. The difference is that the
positioning signal on the thermostat-controlled unit
will come from the control panel in the CCRC/CIRC unit
not from the IntelliPak controller. Inspect the operation
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