Series Premier VS-VH
Page 42
LT135 Dec 2019
4.
Where condensing designs are specified, a Condensate Drain may be installed as shown in Figure 37.
Ensure connection to Drain Pipe is flexible to allow for system movement / expansion during operation, and
that an appropriate Neutralization Device is installed as required.
Figure 37: Condensate Drain Detail – Optional
3. Optional Combustion Air Supply
An air supply at atmospheric pressure of 40 CFM per 100,000 BTU/hr. to each Burner and the end of each Radiant
Branch (at the End Vent Cap) is usually sufficient.
Under certain circumstances of very dirty or wet environments, or extremely negative building pressure, a
Combustion Air Supply System that is connected to the fresh air outside the building may be recommended. The
Combustion Air Supply System must be designed with accepted HVAC design methods to ensure adequate supply
of air to each Burner and Radiant Branch. This Combustion Air can be supplied using a Blower. Supply at the
Burner must be at atmospheric pressure therefore it may be necessary for the Installer to insert Damper Couplings
to allow adjustment of pressure just before the connection to each Burner and at the end of each Branch.
The
Blower must be electrically interlocked with the Vacuum Pump, details can be found in “Electrical
Connections”.
Combustion Air Supply Duct Connections
1.
Install Blower if required.
2.
Install Combustion Air Supply ductwork and Damper Couplings as required.
3.
Each Burner can be fitted with a 4” dia. fitting to accept 4” dia. Type C-Duct or 4” PVC pipe. Provision for
thermal expansion of the System must be made when considering Combustion Air Supply Ducting. Ensure
that the System movement/expansion does not restrict the supply of fresh air to the Burners or the Radiant
Branches. (Refer to Figure 38 for clearance requirements)
As required, connect the Supply Ductwork in the same manner as for the Burner. (Refer to Figure 38 for details),
DO NOT remove the End Vent Cap from the Radiant Branch to make this connection.
