"MACKRIDGE AND KENSTACK" ROOF VENTILATORS
OPERATION, SERVICE AND MAINTENANCE SCHEDULE
GENERAL DESCRIPTION
Mackridge and Kenstack Roof Ventilators can be either ridge (Mackridge) or slope (Kenstack) mounted. The units can be supplied with or without
an internally mounted operating damper, controlled by a series of options, ie: manual cable operation, pneumatic controls or electric actuators.
TESTING
Where the unit is part of a system providing day-to-day ventilation only, we recommend that the units be tested on a monthly basis.
Units should not be left for long periods without testing as this may affect the functioning of the unit.
OPERATING INSTRUCTIONS (TESTING ONLY)
ELECTRO-MAGNET TYPE
TO OPEN:
Interruption of the power supply will cause the damper to open by the action of the internally mounted springs.
TO CLOSE:
Reinstate the power supply, then pull down on re-set cable until the magnet faces meet and the louvres stay closed.
Note:
Care must be taken to ensure that the manual reset cable is unobstructed and free running.
230 VOLT-24 VOLT MOTOR
TO OPEN:
Interruption of the power supply will de-activate the electro-magnet built into the tubular motor, thereby allowing control cable to unwind
and the damper to open by the action of the internally mounted springs attached to the control bar.
TO CLOSE:
Re-instate the power suppl
y and then turn the operating switch to the “close” position. This will re-activate the magnet contained in
the motor and the motor will activate and rewind the control cable to close the damper. (The motor will stop turning when the control bar makes
contact with the limit switch). 24 volt supply must be maintained to hold blades in the closed position.
MANUALLY OPERATED (CLAM CLEAT)
TO OPEN:
Pull cord/cable in a downwards and outwards direction to disengage the clam cleat cable grip and release the cable to open the unit.
TO CLOSE:
Pull cord/cable in a downwards direction until damper is closed then allow cord/cable to engage into the clam cleat assembly to hold
the damper
in the closed position.
OPERATING CABLE - IMPORTANT
Care must be taken to ensure that the manual operating cable is installed in accordance with our recommended fixing instructions and is
unobstructed and free running. Pulleys must be used when direction of cable run is changed, with number of direction changes kept to
a minimum with no acute angles.
PNEUMATICALLY OPERATED
TO OPEN:
Turn control panel switch to open.
TO CLOSE:
Turn control panel switch to close.
ELECTRIC ACTUATOR
TO OPEN:
Turn switch on control panel to “open”.
TO CLOSE:
Turn switch on control pane
l to “close”.
MANUALLY OPERATED (WINCH TYPE)
TO OPEN
: Turn handle anti-clockwise.
TO CLOSE
: Turn handle clockwise.
RESET CABLE - IMPORTANT
Care must be taken to ensure that the manual reset cable located on units with electro-magnet controls, is unobstructed and free
running. The cable must not be tied to the wall or restricted in any way which may prevent the unit opening.
