CSA ANSI Z83.18-2015 Recirculating direct gas-fired industrial air heaters

CSA ANSI Z83.18-2015 Recirculating direct gas-fired industrial air heaters.
3 Definitions
The following definitions shall apply in this Standard:
Accessible having access to, but first may require removal of a panel, door, or similar covering. Air shutter — an adjustable device for varying the size of the primary air inlet(s).
Appliances, automatically controlled — appliances equipped with automatic devices that:
a) accomplish complete “turn-on” or “shutoff” of the gas to the main burner(s); or b) graduate the gas supply to the burner(s) but do not effect complete shutoff of the gas.
Automatic gas ignition system — a system designed to ignite and reignite an appliance burner(s).
Such systems:
a) automatically ignite gas at the main burner, or gas at the pilot burner so the pilot can ignite the main burner;
b) prove the presence of either the ignition source, the main burner flame, or both; and
c) automatically act to shut off the gas supply to the main burner or to the pilot and main burner, when the supervised flame or ignition source is not proved.
Automatic gas ignition system timings
Flame-establishing period
Main burner flame-establishing period — the period of time between initiation of main burner gas flow and proof of the supervised main burner flame.
Pilot flame-establishing period — the period of time between initiation of pilot gas flow and proof of the supervised pilot flame.
Flame failure re-ignition time — the period of time between loss of the supervised ignition source of the supervised main burner flame and a re-ignition attempt. During this time period, the main burner gas supply is not shut off.
Flame failure response time — the period of time between the loss of the supervised ignition source or the supervised main burner flame and the action to shut off the gas supply.
Ignition activation period — the period of time between energizing the main gas valve and deactivation of the ignition means prior to the lockout time.
Lockout time — the period of time between energizing the system and lockout if the proof of the supervised main ignition source or the supervised main burner flame is not established.
Purge time — the period of time intended to allow for the dissipation of any unburned gas or residual products of combustion.CSA ANSI Z83.18 pdf download.