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3.4.2 Securing the Dryer
Mounting holes are provided in the feet of the dryer. Once the dryer has been
positioned in its final location ensure that it is securely fixed in place using
M15 fixing bolts.
3.4.3 Attach the Exhaust Silencer
The dryer is supplied with an exhaust silencer. If the dryer is to be located in a
noise sensitive area, exhaust air can also be remotely piped away. If the
exhaust is to be piped away then a minimum pipe size of 50mm (2 ins) should
be used initially, expanding to larger diameter the longer the piping run
becomes. As a rule of thumb a minimum bend radius of four times the radius
of the pipe should be employed. Failure to pipe away correctly results in back
pressure (indicated by a minimal pressure on the off-line pressure gauge)
which prevents full regeneration of the off-line bed and results in loss of
dewpoint.
3.4.4 Purge Settings
The nominal flow rates for CDAS HL / OFAS HL dryers are based upon an
operating pressure of 7 bar g (102 psi g). If the minimum operating pressure of
the site is higher or lower than the nominal pressure, the purge setting must
be reset for the minimum pressure into the dryer. Failure to correctly set purge
during commissioning will seriously affect dryer performance, operational
costs and will invalidate warranty
Before setting the purge, fully close the valve and ensure that the screwdriver
slot is aligned with the number 12 on the purge dial.
Purge settings comprise of a number of full turns of the adjusting screw plus a
partial turn to the numbered position on the dial. See the table below for the
correct settings.
Example: To set the purge for a CDAS HL 050 operating at 6 Bar g.
Fully close the valve
Turn the screw anti-clockwise 5 full turns
Turn the screw a further partial turn until the screwdriver slot is
half way between No. 1 and No. 2.
Unless otherwise specified, all dryers are factory set at 6 Bar g.
Purge Flow
CDAS /
OFAS
(m3/hr)
(L/m)
Full Turns
HL 050
11
183
+ dial No.
Full Turns
HL 055
14
233
+ dial No.
Full Turns
HL 060
18
300
+ dial No.
Full Turns
HL 065
22
367
+ dial No.
Full Turns
HL 070
30
500
+ dial No.
Full Turns
HL 075
37
617
+ dial No.
Full Turns
HL 080
44
733
+ dial No.
Full Turns
HL 085
60
1000
+ dial No.
16
Dial
4
5
Setting
6
5
6
10
1.5
6
6
11
7.5
1.5
7
7
4.5
0
7
7
8.5
4.5
1.5
8
7
4
11.5
8
8
9.5
4
0.5
9
8
3
9
4.5
10
9
3
7
1
1
2
3
Pressure (Bar g)
6
7
8
9
5
4
4
4
8.5
4.5
1.5
6
5
5
4
7
2
10
6
6
6
5
9
6
2
8.5
7
6
6
6
10.5
8
5.5
7
7
7
7
8
5
2
0
8
7
7
7
9.5
7
4.5
8
8
7
7
1.5
10.5
8
9
8
8
8
2
9
6
3
2
M15 fixing bolts (not supplied)
Exhaust Silencer
Adjustable Purge Dial
10
11
12
13
3
3
3
3
11.5
9.5
7.5
5.5
4
4
4
3
6.5
4
1
11
5
5
4
4
4.5
0.5
9
6.5
6
5
5
5
2
9.5
5
2
6
6
6
6
10
8.5
7
5
7
7
6
6
3
1
11
9.5
7
7
7
7
6
4.5
3
1.5
8
7
7
7
1
11
9
7.5
3
14
15
16
3
3
3
4.5
3.5
2.5
3
3
3
9.5
8
7
4
4
4
4.5
2.5
1.5
4
4
4
11
8.5
7
6
5
5
1.5
10
8
6
6
6
8
7
5
7
6
6
0
10.5
9
7
7
7
6.5
5
3.5
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