Sealed Combustion Installation Requirements; Combustion Air Checklist - Nortec GS Installation Manual

5.7.2.1 Sealed Combustion Installation Requirements

In addition to the requirements of the applicable national and local codes for sealed combustion air sup-
ply installations, the following requirements must also be satisfied:
– The intake vent must not exceed an equivalent length of 100 ft (30 m), except for the Nortec GS 50
using propane gas which is limited to 50 ft (15 m).
Note: Each 90° bend is equal to 10 ft (3 m) of straight pipe, and each 45° bend is equal to 5 ft (1.5 m)
of straight pipe. The intake vent should not have more than six bends.
– The intake vent diameter is listed in
over the entire run.
– Intake vent pipes can be made of ABS, PVC, CPVC or poly-propylene. All joints and seams must
be sealed with an appropriate sealant.
IMPORTANT! Route the intake vent so that it does not obstruct access to any of the services to
the humidifier. On the compact unit, make sure that the maintenance access for the drain pump
is not obstructed.
– The intake vent must be supported every 5 ft (1.5 m), and at every pipe bend.
– An intake (elbow) terminal must be installed on the outside termination of the air intake vent, with the
elbow facing down – refer to
must be located on an exterior surface. The location and spacing between the terminals must comply
with all local and national regulations, with at least a minimum spacing of 3 ft (1 m) between them.
– At low temperatures, water condensation can occur on the outside of the air intake vent. To prevent
this, Nortec suggests adding in-line heating and insulation on the intake vent.
5.7.3

Combustion Air Checklist

Check the following to ensure that the combustion air connection for the humidifier has been installed
correctly:
… Combustion air requirements for the specific type of installation selected meet all national and local
regulations?
Space Air Installation
… Fresh combustion air requirements for the room/space
regulations) satisfied?
… Elbow installed at the intake air inlet (on Nortec GS 150-600 units)?
Sealed Combustion Installation
… All relevant national and local regulations for sealed combustion installation satisfied?
… Intake vent length does not exceed an equivalent length of 100 ft (30 m)? If unit is a Nortec GS 50
using propane gas, is it limited to 50 ft (15 m)? Maximum six bends?
… Vent diameter as listed in
… All joints and seams sealed with appropriate sealant?
… Intake vent supported?
… Spacing between air intake terminal and exhaust vent terminal minimum 3 ft (1 m)?
… Intake vent heated and insulated in cold climates?
Installation
42
Table 15 on page
Figure 19 on page 41. The air intake terminal and exhaust vent terminal
Table 15 on page 41, and uniform over the entire run?
2583703_EN_1608
41. The vent diameter must remain uniform
(Table 14 on page 40 and all national and local
Nortec GS