page no. 18 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Maximum 12m
80Ø - 1480mm
100Ø - 1560mm
130Ø - 1860mm
Terminal
Lengths
Adjustable
length
Flashing
Flue
socke t
Condensate drain
length
Combustion air entry
(fitted with inlet grille
Fig 2b Exhaust only system - vertical
Type B22 installation
2.2.4. Condense Length
Note: NVS heaters are NOT fitted with an
internal trap and must be fitted with an
external trap similar to drawing that is shown
below. The trap can be fabricated using
standard domestic 32mm waste water fittings.
Ensure that the dimensions shown are adhered to.
Fit the condensate drain trap to the drain pipe at the rear of
the heater (15mm). Connect the condense drain length (or
condense drain Tee) (15mm) to the same trap assembly. See
Fig 3. The traps must be filled with water after installation
and before the heater is commissioned.
If the condensate outlet from the heater is blocked for any
reason e.g. freezing, and consequently condensate builds
up in the heater a float switch will operate and shut the
heater down.
The outlet from the trap must be run to a local drain point.
As NVS heaters will generally be mounted at high level
drainage under gravity will be adequate. Where this is
not possible a proprietary condensate pump should be
used. Install following the instruction provide with the
condensate pump.
Notes:
Trap must be positively connected to both the
heater andthe flue condense outlets.
Two separate traps may be used if required.
Access points and/or unions must be included to allow for
trap cleaning.
The approximate amount of condensate the units will
produce per hour is:
Natural Gas G20
Model
l/h
l/m
NVS30
2.3
0.038
NVS60
3.4
0.056
NVS90
6.0
0.098
NVS140
8.8
0.147
Propane LPG
Model
l/h
l/m
NVS30
1.2
0.020
NVS60
1.7
0.028
NVS90
3.0
0.050
NVS140
4.4
0.073
Where it is necessary to route some, or all, of the drain
pipe external to the building precautions must be taken
to prevent the condensate freezing in low temperature
conditions. The drain pipe must be insulated and, if
necessary, fitted with a trace heating cable.
