Gas Supply Installation Instructions - Modine Manufacturing MRL Series Installation And Service Manual

MRL Series

Gas Supply Installation Instructions

The gas supply to the unit heater must be connected and tested in accordance with national, state, 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. In Canada, refer to the latest edition of CAN/CGA B149.1 and .2.
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".
Gas pressure to the appliance controls must never exceed ½" 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).
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! Before connecting the gas supply to the burner control box:
• Verify that the heater's gas type (as listed on the rating plate) matches that of your application and
the installation complies with national and local codes and requirements of the local gas company.
• Unless otherwise noted on the rating plate, this infrared heater is designed and orificed to operate on
standard BTU gas. Contact the factory if utilizing non-standard BTU gas.
• Check that the gas piping and service has the capacity to handle the total gas consumption of all
heaters being installed, as well as any other gas appliances being connected to the supply line.
• Check that the main gas supply line is of proper diameter to supply the required fuel pressures.
• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas
supply lines in accordance with local codes.
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
3.0 Installation •
19
Gas Supply Installation Instructions