5
Energy Recovery Ventilation System
(7) When an electric heater is installed, it should be interlocked with the ventilator. That is, the electric
heater will work only when the ventilator has been started. Ducts within a distance of 800mm with
the electric heater and ducts which go through a room where there is a re source, they should be
made of non-inammable materials.
(8) The ltering element should be replaced periodically. Therefore, a certain distance should be kept
at one side for maintenance.
(9) A steel hanger frame should be pre-embedded before installation. Its type and specification
depends on the weight of the ERV to ensure stability. For the retrotting project, drill holes at a
ceiling for the hanger frame, as shown in the gure 6(a). When hole drilling is unavailable, locate
the reinforcing steel inside a concrete ceiling and take it as the hanger frame, as shown in gure
6(b). Note that installation should be based on the eld-supplied equipment.
Reinforcing steel
Hanger frame
Ceiling
Hanger hook Ceiling
Figure 6 (a) Figure 6 (b)
(10) When the ceiling is damaged during installation, it should be repaired before completion of this
project.
2.3 Installation diagram
Discharge air duct
Fresh air duct
Fresh air inlet
Insulation
Return air outlet
Return air inlet
Fresh air outlet
Return air
Supply ai
r
Figure 7
Note: the installation arrangement is based on the actual structures and unit design.
NOTE
Outdoor ducts connected with the fresh air inlet and polluted air (return air) outlet should be
insulated, so do indoor ducts when temperature and humidity is quite high inside the ceiling. Besides,
the indoor ducts should keep a certain gradient (1/50~1/30) to prevent water entering inside.
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