page no. 17 of 44
HEMNVx & HEMSL Range Users, Installation & Servicing Instructions Doc Ref M103 issue 3.6 Mar 2020.
IMPORTANT:
Not applicable for models 150, 175 & 200
For Type C flued installations, a concentric flue system
should be used of the appropriate orientation.
The total
calculated maximum
permitted length of flue
system for sizes
up to and including model 50 is 14m,
from model 60 to 125 is 16m.
Concentric flue terminals are
equivalent to 5m of flue length. If an offset is required two
sets of 45° bends should be used each set being equivalent to
0.5m of flue length. 90° bends may be used but each set will
be equivalent to 1.0m of flue length.
Exhaust flue outlet positions are shown in the previous
diagrams and tables.
Air inlet holes should be cut to the dimensions in the
following table to accept the silicone seals supplied.
(where ØD is the actual cut size in the casing/sheet metal).
Type C Flue and air inlet cut hole sizes and centres
distances. (refer to table below)
HEMNVx
HEMSL
A CRS
ØD
10-3
n/a
120
91
15-4
n/a
120
91
18-5
n/a
120
91
25-5
n/a
142
112
30-6
30-6
142
112
40-8
n/a
142
112
n/a
45-9
142
112
50-6
50-6
142
112
60-7
n/a
220
142
n/a
60-12
220
142
75-9
75-9
220
142
n/a
75-15
220
142
n/a
90-18
220
142
100-12
100-12
220
142
110-13
n/a
220
142
125-15
125-15
220
142
The silicone seals supplied are not water tight
and should not be used in external vertical
applications. A suitable water tight seal or
sealant must be used in these instances
Silicone
Seals
A CRS
The whole of the gas installation, including the meter,
should be inspected and tested for soundness and purged
in accordance with the recommendations of IM/16:1988.
Simulated enclosure
A CRS
ØD
ØD
