Appendix
Heat Transfer Fluid Preheater Information
Function
•
The design intention for
the HTF preheater is to
ensure a smooth start in
cold environments. The
preheater heats the
glycol in the heat
exchanger which in turn
sends heated glycol to
DRYAIR’S patented air
and fuel preheater to
provide a controlled
constant air and fuel
temperature thus
providing smooth start
operations in cold weather.
•
While using the HTF preheater it is recommended to have a supply temperature to be
between 140°F and 150°F (60°C to 65°C) before turning on the pump and burner
switch. The time line before these temperatures can be achieved will depend on the
ambient temperature outside. Basically, the colder environment outside the longer it
will take to achieve the recommended supply temperature.
Pros of Using HTF Preheater:
•
Using the HTF preheater according to recommendations will ensure a smooth start in
all weather conditions thus providing a superior product to all users.
•
Allows the machine to operate in even the coldest environments with fewer
combustion issue.
•
Less down time and reduced fuel costs as units will start and run at maximum
efficiency.
•
Having warm glycol reduces initial load to the glycol circulating pump at start up.
•
Increase heat exchanger longevity and efficiency.
•
Decreases maintenance costs due to the reduced stress on all components during cold
startups.
Cons of Not Using HTF Preheater:
•
Burner may not fire which in turn will create down time on job locations. For
competitor’s units that do not have a preheater option, this typically means bringing
the unit off site to a heated shop to allow the unit to thaw out before it will fire.
Again, it will depend on the ambient temperature inside the shop as to how long this
Figure 60-HTF Preheater
9-7
Summary of Contents for 600 GTS Series
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