HydraMaster CTS 403 Flex, Owner'S Manual

Page: 51 / 140

Machine Maintenance: 4-18
CLEANING OUT THE HEAT EXCHANGER OF THE CTS 403
During routine maintenance, and when the SERVICE HEAT EXCHANGER light is a
continuous red during operation, access to the heat exchanger assembly can be made by
removing the cover plates of the plenum. With the unit off, use a 5/16” nut driver or socket
to remove the left side panel of the inlet plenum. Remove the gasket underneath the plate
to expose the heat exchanger core.
The inlet side will collect debris like hair and carpet fiber, as well as engine carbon and
chemical residue. Using a radiator comb or similar brush, remove loose debris and clear
it from the heat exchanger.
Remove the second heat exchanger access plate from the right side of the unit and
check the condition of the core. With both plates and gaskets removed, a bright light can
be used to shine on one end and should be visible through the core’s veins. If not, or if
chemical and other debris is visible in the outlet side of the plenum, the heat exchanger
should be cleaned out with warm, soapy water, isopropyl alcohol, or other method.
Protect the van and the rest of the machine from debris by replacing one side cover of
the plenum access port and using low pressure to clean the core. Remove as much
fluid and residue as possible before replacing both cover plates and testing the unit’s
backpressure. Run the machine long enough to vaporize any water or other cleaner that
might have collected in the silencer, as any residual water in the silencer can result in
rusting and component failure.
It is highly suggested that a routine deep cleaning be performed every 1000 hours of use.
Very carefully remove the entire heat exchanger assembly from the machine, remove all
components and covers, and use a high-quality degreaser. It is recommended to check
the status of the soaking cores every few hours to ensure that there is no danger of
premature structural degradation or long-term damage. This method of deep cleaning
might take as long as overnight to get the best results.
Some recommended types of cleaning products are:
• Coli Safe Professional Grade Neutral pH Evaporator and Condenser Cleaner
• Air Conditioner Coil Foam Cleaner
• Evap Foam No Rinse Evaporator Coil Cleaner