Carrier 69NT40-561-019, Operation And Service Manual

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T-359 7–16
Carrier Transicold has identified a fully biodegradable and environmentally safe alkaline cleaning agent (Tri-Pow'r®
HD) for the unit. This will assist in helping to remove the corrosive fumigation chemicals and dislodging of the cor-
rosive elements.
This cleaner is available from the Carrier Transicold Performance Parts Group (PPG) and can be ordered through
any of the PPG locations; Part Number NU4371-88.
As a general safety precaution, before using this product, refer to and retain the Material Safety Data (MSDS)
sheet. This document can be found at:
http://www.nucalgon.com/products/coil-cleaners/condensers/tri-powr-hd
Prior to Cleaning:
• Always wear goggles, gloves and work boots.
• Avoid contact with skin and clothing, and avoid breathing mists.
• When mixing, add water to the sprayer first, then the cleaner.
• ALWAYS provide for proper ventilation when cleaning indoor evaporator coils (rear doors must be open).
• Be aware of surroundings - food, plants, etc., and the potential for human exposure.
• Always read directions and follow recommended dilution ratios. More is not always better. Using non-diluted
cleaner is not recommended.
Cleaning Procedure:
a. Remove the upper evaporator access panel inside of the unit.
b. Spray the surface with water before applying the cleaning solution. This helps the cleaner work better.
c. Liberally apply the prepared cleaner solution (5 parts water and 1 part cleaner).
d. Allow the cleaner to soak in for 5 to 7 minutes.
e. Assess area for rinsing. Follow all local regulations regarding disposal of waste water.
f. Thoroughly rinse the cleaner and surrounding area, floor, etc. When rinsing where heavy foaming solution is
present, it is very important to take the time to thoroughly rinse the equipment and surroundings.
g. Always rinse the empty coil cleaner bottle, cap tightly and dispose of properly.
7.12 ELECTRONIC EXPANSION VALVE
The electronic expansion valve (EEV) is an automatic device which maintains required superheat of the refrigerant
gas leaving the evaporator. The valve functions are:
(a) automatic response of refrigerant flow to match the evapo-
rator load and (b) prevention of liquid refrigerant entering the compressor. Unless the valve is defective, it seldom
requires any maintenance. See Figure 7.9 .