901-10113 - 34 - 9/16/2024
5.5 Clean and Wax Fiberglass
The Cold Plate system condensing unit has a durable fiberglass (FRP) cover, or cowl. All exterior
surfaces of the Johnson Truck Body are of similar construction. Their beautiful, natural gloss gel-coat
finish will stay attractive for many years if the following steps are taken:
1. Wash periodically with ordinary car-washing soap and water.
(NOTE: Do not clean regularly with acetone or lacquer thinner)
High caustic soaps and solutions will cause premature color fade and panel surface
deterioration.
Hot Water Pressure Washing is normally acceptable for fiberglass parts, though an improperly
aggressive spray nozzle can damage the finish. It is best to use the White 40° washing nozzle.
However, pressure washing it is not recommended for the refrigeration cowl due to the risk of
damaging the fins of the condenser coil with too much water force. If pressure washing the
truck, do not direct the nozzle into the condenser coil. (See Figure 5 and Figure 6 for reference)
2. For best finish protection, we recommend applying a coat of wax one or two times a year.
Waxing helps protect against everyday elements and ultraviolet rays which cause surface
oxidation of the gelcoat. Many automotive, RV, or fiberglass boat waxes can be used. Look for a
product formulated to protect against gelcoat oxidation and follow the instructions on its label.
5.6 Prohibited Adjustments
The following tasks should never be conducted unless directed to do so by Johnson Truck Bodies.
Failure to obtain authorization and directions for refrigeration adjustments could result in warranty
revocation, refrigeration system failure, and possible injury to the operator.
1. Tampering with expansion valve settings.
2. Adjusting the high and low pressure cut in and cut out settings.
3. Other adjustments to the condensing unit.
4. Adjustments or modifications to electrical components and wiring inside the control box covers.
WARNING: Unauthorized maintenance, adjustments, or replacement of electrical components within
the electrical control box could cause major failure to the refrigeration system as well as electrical
hazards.
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