Trane Modular 20 to 35 Tons Installationshandbuch PDF herunterladen (Seite 26)

Maintenance

26 CXRC-SVX01F-EN

addition, use a quality detergent; like SPREX AC, OAKITE

161 or OAKITE 166 and COILOX.

Note: 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.

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.

6. Place solution in the sprayer. Be sure to follow these

guidelines if using a high-pressure sprayer:

a. Minimum nozzle spray angle is 15°.

b. Spray solution at 90° to the coil face.

c. Keep sprayer nozzle at least six inches form the coil.

d. 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

Intellipak 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 of the pressure switches.

The switches should be open when sensing pressures less

that 170 psig and should be closed when sensing

pressures greater than 265 psig.

Troubleshooting

If operational difficulties are encountered, perform these

preliminary checks before calling a service technician.

• Check the system thermostat to ensure that all

setpoints are set correctly and that thermostat is

getting control power.

• Verify that the unit is receiving electrical supply power

and that all fuses are intact.

• Check the condenser for proper air flow and take

temperature readings across the condensing coils.

After completing the preliminary checks above, inspect the

unit for other obvious problems such as broken or

disconnected wires clogged grills or coils. If everything

appears to be in proper working order and the unit fails to

operate properly, contact a qualified service technician.

WARNING

Hazardous Pressures!

Coils contain refrigerant under pressure.When cleaning

coils, maintain coil cleaning solution temperature

under 150°F to avoid excessive pressure in the coil.

Failure to follow these safety precautions could result

in coil bursting, which could result in death or serious

injury.

WARNING

Live Electrical Components!

During installation, testing, servicing and

troubleshooting of this product, it may be necessary to

work with live electrical components. Have a qualified

licensed electrician or other individual who has been

properly trained in handling live electrical components

perform these tasks. Failure to follow all electrical

safety precautions when exposed to live electrical

components could result in death or serious injury.

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