64659-001 REV. A 07/06/18
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SETUP
Proper setup of the burner system requires:
1.
Installing the proper orifice
2.
Setting the air shutter
3.
Calibrating the blower
4.
Setting the dip switches on the control board
5.
Adjusting the modulating valve
The orifice, air shutter, and dip switches may all be set before installation. Adjusting the modulating
valve and calibrating the blower require that power be connected to the burner system and gas be
connected to the inlet pipe.
Orifice
Proper burner setup requires selection of an orifice size and air shutter setting based on the expected
maximum Btu/hr required for the application using Table 5.The high-fire rate produced by the iHEAT
burner system in a given appliance will be determined by the size of the gas orifice installed in the
burner. The burner ships from the factory with a 1/8” orifice, which will fire natural gas at a maximum
firing rate of 50,000 Btu/hr. The iHEAT system is capable of a 5:1 turndown, thus the resulting low-fire
rate with this orifice would be 10,000 Btu/hr.
Selecting the proper gas orifice size is important for optimal system performance. If the selected orifice
produces a high-fire rate that is more than necessary for the appliance during loaded operation, the
iHEAT system will operate at the very low end of the firing rate a majority of the time. The best system
performance will be obtained when the selected orifice results in a firing rate that heats the appliance
from a cold start to temperature in the longest acceptable time, and is able to maintain appliance
temperature under max load conditions.
The air shutter settings given here are for use with dip switch settings 5 (natural gas) and 6 (propane
gas). These settings were determined based on lab testing and should give a good starting point for
adjustment in a new application. When commissioning an appliance, some adjustment of the air shutter
from these values is required for safe and efficient operation of the burner.
A qualified technician must use a combustion analyzer to properly set up any burner system.
Check flue gases for carbon monoxide. This check requires specialized equipment.
CARBON MONOXIDE HAZARD
