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Premium Commercial Controls
ERV
60
7.0 SPECIAL FEATURES
These features are not common but are available in the ERV controller.
7.1 FROST CONTROL
ERV units utilize the optional bypass damper to bypass the core when it is very cold outside.
This is usually used in northern states and Canada. To enable the frost control functionality
for these units the Enable Frost Cntl must be set to YES in the
Unit Configuration
(password
protected) screen.
SPECIAL FEATURES
The frost control function disables the supply fan and closes the OA damper when the following
conditions are met:
u
The OA temperature is less than the OA Below set point
u
The EA temperature (sensed at the inlet to the EA fan—average exhaust air temperature) is
below the EA Below set point.
For variable speed fans, an additional setting is required for the exhaust fan operation. While
the supply fan is off, a variable speed exhaust fan (ECM or VFD) will operate at the command
set by the FC Exh Command set point. This command allows the user to minimize the negative
space pressure that will be generated with the EF on and the SF off during frost control.
For fans that are not variable speed, the exhaust fan will run at the normal speed and this
setting will not be shown.
The frost control mode ends (OA damper is opened and the supply fan is enabled) when the EA
temperature increases to the EA Above set point. The unit then resumes the selected normal
operating mode. If the EA temperature then falls below the OA Below set point frost control
mode is enabled again.
There is a
Unit Status
screen that will appear if frost control function is enabled.
