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010.4150.0720 08.21
4. MECHANICAL INSTALLATION
4.1 GENERAL
WARNING
Failure to install, maintain and/or operate the
VHX-DR Heat Recovery Center in accordance
with the manufacturer’s instructions may result
in conditions which can produce bodily injury
and property damage.
The VHX-DR must be installed by a qualified installer in
accordance with these instructions and all local codes, or in
their absence, with the latest edition of The National Fuel Gas
Code (NFPA54/ANSI223.1), NFPA 211, NFPA 31 or Canada
CAN/CSA-B149.1-05 National Gas and Propane Installation
Code when applicable. The VHX-DR must be mounted so
the clearance to combustibles is at least 18 inches.
Preferably, the VHX-DR should be installed as close to the
heating appliance as possible — vertically or horizontally in
the breeching. It can also be installed near the termination
or on a roof. In addition, it can be used for sidewall
vented applications where it discharges through a wall. A
condensate drain is provided with the VHX-DR to be installed
by the user.
The VHX-DR is for indoor and outdoor installation. If installed
outdoors, steps must be take to prevent freezing of water
in the VHX-DR housing and pipes (see Section 4.3). The
vent pipe must be installed and supported according to the
chimney manufacturer’s instructions and/or in accordance
with NFPA54, NFPA211 and Canada CAN/CSA-B149.1-05.
4.2 POSITIONING
Consult “2. Specifications” for specific weights and
dimensions to ensure a well designed and safe installation
when either hanging or supporting the exchanger. The
exchanger is shipped ready to be mounted in the vertical or
horizontal position. Make sure to check the actual number of
lugs and their positions on the spec drawings before planning
the installation.
For existing retrofit installations, ensure that the combustion
source has been turned off and has cooled. A condensate
drain connection is provided at the bottom of the unit.
Header manifold inlet/outlet connections for water supply and
return are optional. For retrofit installations the economizer is
installed in line with the existing exhaust stack or duct unless
otherwise noted
Generally a section of the exhaust stack is removed to
accommodate the insertion of the economizer. The remaining
portion of the exhaust stack above the cut should not exceed
a static load of 500 lbs. or exert any moments on the outlet
flange, and must be adequately supported.
In some cases the economizer may be placed directly on top
