Detroit Radiant Products Company HLV Series - Manual (Page 40)

40
HLV Series
IMPORTANT! The heating system will expand and contract during operation. Allowances for
expansion must be made between the connection to the heater and the gas supply. Excessive
bending, kinks, twists or vibration must be avoided. A flexible gas connection of approved type is
required. Flexible stainless steel gas connectors installed in one plane, and without sharp bends, kinks
or twists is recommended.
3.0 Installation • Gas Supply
WARNING
!
An approved connector, suitable for the environment of equipment usage, is required.
Visible or excessive swaying, flexing and vibration of the gas connections
must be
avoided to prevent failure. In no case shall the gas or electrical supply support the
weight of the heater.
The gas pipe and connection must be supported independently. Do not install gas supply line in a manner
that bears the weight of the heater. Connect the main gas supply line with an approved flexible connector
(Figures 3.26-3.27) or, if national or local codes require rigid piping, a swing joint. Heater shall not be
connected to the building piping system with rigid pipe or semi-rigid metallic tubing, including copper.
When using such material, an intermediate connection device that allows for heater expansion must be
used.
The gas outlet must be in the same room as the appliance and accessible. It may not be concealed within
or run through any wall, floor or partition. When installing the heater in a corrosive environment (or near
corrosive substances), use a gas connector suitable for the environment. Do not use the gas piping
system to electrically ground the heater.
1
Install a sediment trap / drip leg if condensation may occur at any point of the gas supply line or as
required. This decreases the possibility of loose scale or dirt in the supply line entering the heater’s
control system and causing a malfunction. NOTE: High pressure gas above 14 Inches W.C.. (water
column pressure) requires a high pressure regulator and ball valve.
2 Form the stainless steel flexible connector into a smooth C-shape allowing 12 in. between the flexible
connector’s end nuts (Figures 3.26-3.27).
3 Attach the ball valve to the gas supply pipe. Apply pipe compound to NPT adapter threads to seal the
joint. Use only a pipe compound resistant to LP.
NOTE: Provide a 1/8 in. NPT plugged tapping accessible for test gauge connection immediately
upstream of gas connection to the heater (provided on ball valve).
4 Attach the flexible connector to the adapter and burner control box inlet. Seal the joints.
Note: Excessive torque on the manifold may misalign the orifice. Always use two wrenches to tighten
mating pipe connections.
5 Final assembly must be tested for gas leaks according to NFPA 54 and all local codes and/or Standards.
WARNING
!
Testing for gas leaks with an open flame or other sources of ignition may lead to a fire or
explosion and cause serious injury or death. Test in accordance with relevant codes of
practice.