30
Rev. 01.01
COMMISSIONING
5. COMMISSIONING
MENU 16 - FREECOOLING
The Freecooling function is designed to utilize cool
night air during warmer months to "pre-cool" the
building prior to occupancy. In this mode, the heat
exchanger core is bypassed fully (recuperation is
undesirable at this time) and the HRV runs at the
predetermined flow rate.
For the HRV to enter Freecooling mode, all of the
following conditions must be met:
• Freecooling enabled
• Time and date within permitted range
• T-EXT1< T-INT1 - 4°F
• T-EXT1 > Min. Bypass Temp
In order to accurately assess these conditions, a
Pre-Freecooling mode will activate:
• If within the permitted Freecool time frame
•
If there is no airflow through the unit
• In this mode, fan speed is increased for
ten (10) minutes each hour to circulate air
through the ducts and obtain an accurate
measurement of environmental conditions.
While functioning in Freecooling Mode, the HRV:
•
Runs fans at rate specified in settings menu
• Varies bypass damper as necessary to
maintain minimum duct temperature
If during Freecooling functionality, any of the fol-
lowing conditions are met, the mode will termi-
nate.
• Current time no longer within permitted
window
•
T-INT1 ≤ T-EXT1
(Building is same temp as ambient)
•
T-INT1 ≤ Temp in Freecooling settings
• User Intervention
(Resumes after 10 min inactivity if all
Freecooling conditions still met)
Outside
Air
Exhaust
Air
T-INT1
T-INT2
T-EXT1
T-EXT2
T-EXT3
Room
Air
Supply
Air
Thermistor Location
14 - Occupancy
15 - Boost
16 - Freecooling
17 - PID Parameters
18 - HW Test
Freecooling is assessed also if the unit is in
stand-by (at a selected time and date the unit
starts-up and assesses if the freecooling may
be activated - see Pre-freecooling above)
Set the time
window
Freecooling
is allowed
Date range
Freecooling is
allowed
Enable/disable
Freecooling
mode
Set the
desired
flow
Set the target temperature (measured
at the Extract duct sensor).
55°F
MENU 17 - PID PARAMETERS
15 - Boost
16 - Freecooling
17 - PID Parameters
18 - HW Test
20 - Modbus RTU
Setting control features. If the control is unsteady
or variable, this configuration can be done only
after consulting the manufacturer.
Preheater 1 - 68
°
F 60s 0min
Содержание VS1200 CMh/e
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