- 10 -
2
87.29
104.58
124.69
141.69
159.78
157.92
2.25
86.20
103.36
123.60
140.60
158.33
156.29
2.5
85.11
102.13
122.51
139.51
156.88
154.65
2.75
84.02
100.90
121.42
138.42
155.43
153.02
3
82.93
99.68
120.33
137.33
153.98
151.38
3.25
-
98.45
119.24
136.24
152.52
149.75
3.5
-
97.22
118.15
135.15
-
148.11
3.75
-
-
117.07
134.07
-
-
4
-
-
115.98
132.98
-
-
5.9 Accessory Items
5.9.1 Filter
Air handling units can be supplied with flat
filters and/or bag filters. There are 2 types
of filter frame, sliding frame or universal
clip. Insert the filter into the frame by
following airflow arrow indicated.
5.9.2 Mixing Box
Fresh air and return air dampers can be
linked together and drives by the same
actuator if both are same size. Care must
be taken to ensure dampers are in open
position while the fan is running whether
they are integral with central plant control
or associated ductwork under negative
pressure condition.
5.9.3 Variable Pitch Pulley
Modifications of the pulley diameter must
be done when stationery by moving the
adjustable flange. Each complete rotation
of one of the two disks results in a
variation of the pulley diameter. (See
Table 2 & Figure 27) When the required
diameter is obtained, adjustable flange is
locked by tighten the four clamp screws.
To get the same diameter in the two
grooves of pulleys, screw the two mobile
flanges on the central flange. Then
unscrew the two mobile flanges by the
same number of turnings to get the
required diameter.
Note that the belt centre line shifts when
diameter changes. Driven pulley may need
realignment.
Figure 27 – Variable Pitch Pulley
5.9.4 Heat Wheel
Follow
Heat
Wheel
manufacturer
recommendations for proper installation
procedure. Apply silicone to air leak spots
at baffle plates. (If applicable)
Refer to assembly of heat wheel baffle
plates at Appendix 9.1 when the heat
wheel section not able to ship in complete
build up.
5.9.5 Heat Pipe
After installation of Heat Pipe with refers
to manufacturer recommendations, site
installer to install heat pipe baffle plates at
site, this is to avoid air bypass heat
pipe/main cooling coil from top and side.
(If applicable)
5.9.6 Electric Heater
Power supply to electric heater and
electric connection is in accordance with
wiring diagram in terminal box of electric
heater.
The rated voltage of electric heater is
240V, single phase.
IMPORTANT
IT IS ADVICED TO INTERLOCK
ELECTRICAL
HEATER
WITH
BLOWER TO ENSURE HEATER IS
NOT ENERGIZED WHEN THERE IS
NO AIR FLOW.
