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8. INSTALLATION
8.1 PRODUCT INSTALLATION
As with natural ventilation smoke hatch units, our powered SMHA HATCH product can be installed onto a roof
or a car park deck in one lift, as the product is pre-assembled. It can be mounted directly onto a concrete slab or
a similar surface, or onto a specially designed base (builders upstand or suitable metal upstand). Ideally, a flat
surface is required for installation.
Integration of the roof structure and the Hatch product, including thermal and water insulation, is carried out in
accordance with the instructions of the structural engineer of the site. If our product is to be used for extracting
smoke from wet rooms, measures must be taken to prevent build-up of condensation. If the unit needs to draw
in air freely from the space below, the product should be equipped with an inlet safety guard. In this case, the
product can be mounted directly onto a flat surface. If the fan is to be connected to ductwork, it can be delivered
with an inlet counter flange to facilitate easy connection to ductwork.
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1
3
4
6
1
2
8
3
4
8
2
Figure 1
Figure 2
Fig. 1
Fig. 2
Attachment to the roof
Attachment to the roof
directly by the unit's
structure with angle
flanged base
brackets
Angle brackets should be fixed to the unit's base with a minimum
of four 5x40 screws or to the roof structure with a minimum of
four screws as follows:
- 4 to 6 HILTI HPS-1 screws 6/5x30 for concrete
- 4 to 6 wood screws 5x50 for wood
- 4 to 6 self-drilling screws 5.5x25 for steel-reinforced concrete
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7
1. Opening hatch
2. JMHT fan
3. Impeller
7
5
4. Motor
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5. Safety guard / counter flange
5
6. Hatch motors, 2 pcs.
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7. Safety guard on the outlet
8. Roof structure
9. Roof Installment Options - see figure 1 and 2.
10. Fan safety switch
11. Safety switch for hatch motors
12. Limit switch
Safety Switch
Safety switch
Viewed from the hinged side of the hatch, the safety
switches are on the right-hand side of the casing.
8.2. SAFETY REGULATIONS
DANGER!
Where the unit hatch is open for maintenance work, there is a risk of falling through the fan
opening, especially where the fan has been removed from the product. Special care should
be taken to prevent falling during the maintenance work.
8.3. ELECTRICAL CONNECTIONS
WARNING! All electrical connections must be wired by authorised personnel only.
The necessary electrical and safety precautions in this instruction manual must be followed.
The unit is equipped with 2 safety electrical isolator switches, one for the fan motor and one for the opening
motors. The product is equipped with a limit switch, which provides information on the opening or closing of the
hatch. Electrical connections as shown in the diagram below (see diagram under heading 8.4 Wiring Diagram).
The cable connection from fan terminal box to the fan motor must be made using a fire-resistant cable. Cable
entries in the casing must be sealed with fireproof sealant.
It is advisable to only use the hatch limit switch to provide a signal as an indication that the "hatch is closed"
(for information only). A motor start signal should be provided by a separate control circuit. To ensure correct
operation, the control logic must ensure that the fan starts at least 30 seconds after the linear actuator motors
(which open the hatch or lid) have been energised.
WARNING! Linear motors must not be exposed to the control voltage!
NOTE!
The approximate hatch closing time is 3 minutes, after which the
power must be turned off.
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