September 2020
7
Quest IQ Dry Cooler OMM
Labels and Stickers
: attached normally to indicate dry cooler external systems connections (piping, electrical etc.),
terminals designation, to display warning etc.
Wiring Diagrams
:
typically, attached to the interior side of the dry cooler main electrical panel, depicting control
and power wiring.
Operation and Control
Dry cooler rejects the heat, absorbed by the cooling media (water etc.) from the external system(s) that dry cooler
serves, to the outdoor air.
Operation and Media Flow
Dry cooler operation is quite simple:
•
Upon the command (when heat rejection is needed) dry cooler engages its fan(s) to establish the airflow
across the coil(s).
o
Depending on the type of fans (modulating EC-type or two-speed), control type and command
received, cooler total airflow is adjusted by varying fan(s) speed and/or number of operating fans.
•
Cooling media flow must be established also
–
either by separately controlled pump (part of the external
system) or by the built-in pump package pump. In latter case, pump would engage with the fan(s) and will stay
engaged while the command exists (while at least one fan is running).
•
Until call for heat rejection is satisfied and command to dry cooler is removed, fan(s) and pump will run; once
command removed, all fans and the pump will stop.
Pic. C.4 below shows schematic layout of dry cooler operation and media (air and water/glycol) flow.
For more details on dry cooler piping connection refer to Installation Manual, submittal documentation etc. as well
as local Codes and proper field practices.
Pic. C.4
