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3.0
Installation
•
Gas Supply
• Test and confirm that inlet pressures are correct. Refer to the heater rating plate for gas type and
the required minimum and maximum pressures (see Chart 3.8). The gas supply pipe must be of
sufficient size to provide the required capacity and inlet pressure to the heater (if necessary,
consult the local gas company). Do not exceed the maximum allowed pressures for the heater,
the space, or the gas piping system.
Gas Supply Installation Instructions
The gas supply to the tube heater must be connected and tested in accordance with national, state,
provincial, and local codes along with guidelines in this manual. In the United States refer to the latest
edition of the ANSI Z223.1 (NFPA54) Standard and in Canada refer to the latest edition of the CAN/
CGA B149.1 Standard.
Supply gas piping to the unit should conform with the local and national requirements for type and
volume of gas handled, and pressure drop allowed in the line. Avoid pipe sizes smaller than 1/2".
The installation must conform with local building codes or, in the absence of such codes, the National Fuel
Code (NFPA 54) and in conjunction with ANSI Z21.24/CSA 6.10 "Connectors for Gas Appliances".
Gas pressure to the appliance controls must never exceed 1/2 PSI (14" W.C.).
Damage to the controls may result.
Gas lines should be purged of air as described in ANSI Z223.1 (NFPA 54) or CSA-B149.1– latest
version. Installation of the piping must also conform with the local building codes, or in the
absence of local codes, with the latest edition of the National Fuel Gas Code (NFPA 54). In
Canada, installation must be in accordance with CSA-B149.1
The total input to the appliance must fall within +/- 5% of the rated input as indicated on the rating
plate. Otherwise the heat exchanger may prematurely fail.
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. A flexible gas
connection of approved type is required. Flexible Type 1 gas connectors installed in one plane, without
any sharp bends, kinks or twists.
WARNING
!
Improperly connected gas lines may result in serious injury and death,
explosion, poisonous fumes, toxic gases or asphyxiation. Connect gas lines in
accordance to national, state, provincial and local codes.
CAUTION
!
NOTICE
38
DX2
Series
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