HEX390 Installation & Commissioning Instructions September 2023 HEX390 Installation & Commissioning Instructions September 202314 15
1. Heater Kit Yes/No (default Yes)
If No - heater options are removed from all menus.
If Yes - heater options are available in User menu - Heater On/Off for continuous or night
heat (to times as set below) .
To set night heat option:
• press up arrow to select Yes, then:
• press mode to display ‘Heater Times’>display then changes automatically to show
the current settings (default: ) >display changes again to ‘Change Times’
Yes/No (default No).
• At this point, use then to select Yes & change the times.
• Select desired Heater ON time in Hours:Mins using or
• Select desired Heater OFF time in Hours:Mins using or
• Heater Test Yes/No (default No)
• change to Y, heater test will be performed. If there are any faults (including no
heater connected), ‘Heater Fault’ will display. (See menu item 3.Fan Speed Heat for
possible Heater Fault causes.) To reset Heater Fault display, turn unit off.
2. Max Fan Speed (default 60%) – Range is 35% to 100% adjustable in 1% increments using up
& down arrows. For a large house set to a max of 100%.
House size Max Setting
Up to 120m250%
120m2- 180m270%
180m2 - 250m2100%
280 + Two or more units recommended
3. Fan Speed Heat (default 45%) – Range is 30% to 60% adjustable in 1% increments using up &
down arrows.
Fan Speed Heat sets a minimum speed for the fan to ensure enough airow for the heater
to operate. There are many duct fan combinations, some more restrictive to airow than
others. Therefore, when setting up, the installer must check that the heater operates
without ‘Heater Fault’ ashing on the display. ‘Heater Fault’ is triggered when the heater
is operating but draws no current, this is most often due to insucient airow causing
the airow proving switch to cut off. If there is insucient airow, increase the ‘Fan Speed
Heat’ setting. Heater fault may also be caused by manual reset thermal cutouts which may
need to be reset.
4. Winter Mode Yes/No (default Yes). Winter mode shuts the system down when the outside air
temperature gets below eg 2°C. If Winter Mode is on, another menu item will appear to allow
adjustment of actual shut down temp: Range -2°C to +5°C.
Heater ON 19:00
Heater OFF07:00
Digital Controller - Commissioning Instructions - Menu Options
Digital Controller - Commissioning Instructions (continued)
5. Filter Timer Yes/No (default No) – Controller counts hours run by the fan and when lter is
due for a change the display ashes with ‘Swap Filter’. If lter timer is set to ‘Yes’, another
menu appears allowing lter period adjustment (240 day) (range 150 - 240 days). The lter
timer can be reset in the user menu at any time. The timer should be reset after the lters
have been cleaned or replaced.
6. I/Side Ref Temp (default 18°C) Range 16-24°C. This is the reference temperature for the
inside of the house, used for:
• Heating – when house temp (IS) is lower than 18°C (default) and outside temp (OS) is
lower than 12°C (default) the heater will operate (if tted).
• Summer – when house temp (IS) is higher than 18°C (default) and outside temp (OS) is
higher than 27°C (default) the unit will shut-down.
7. O/Side Ref Temp (default 12°C) Range 8-16°C. This is the reference temperature for the
outside air, below which heater operates (if tted).
8. O/Side Degree Offset (default 0°C) this allows unit to be calibrated in the unlikely event that
outside air temperature reads too high or low (adjustment range -10°C to + 10°C).
9. I/Side Degree Offset (default 0°C) - As above.
10. Heat P/band (default 5°C) Range 1-7°C. Heat Proportional Band - When heater is tted and
conditions call for its operation, heater will start heating at 20% when OS (outside) drops to
reference temp (default 12°C), and will operate at 100% when temperature has dropped by a
further (default) 5°C (ie when OS is 7°C).
11. Summer Temp S/down (default 27°C) Range 25°-35°C. When OS (outside temp) is greater
than 27°C and IS (inside temp) is greater than 18°C, the system shuts down.
12. User Sys Yes/No (default No) - when set to ‘Yes’, there is an option in the User menu to turn
the system On/Off. Once the system has been turned off, any key may be pressed to return
the unit to regular operation.
13. Factory Reset Yes/No (default No). ‘Yes’ resets all menu items to the factory default settings,
these default settings are shown in brackets above. This option will ask for conrmation to
‘Erase Sengs?’ before performing the factory reset.
• Optional Attic Damper Kit. A diverting branch can be attached to divert the intake from
outside air to the attic to utilise the heat gain from roof during winter months. Press mode
and up arrow together until ‘Damper is on’ or ‘Damper is off’ displays. The user can
then select between ‘Change damper? YES’ or ‘Change damper? NO’ then displays. Use the
up arrow to change between the two settings and press the mode key to select.
See p19 for User Instructions
Smooth-Ai
Smooth-Ai
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For assistance with commissioning, call Smooth-Air on 0800 SMOOTH (0800 766 684) or
email sales@smooth-air.co.nz
