SECTION ONE – Heater Design and Function
1. The Blower draws ambient air into the Burner
System by negative pressure through the AAAAiiiirrrr
OOOOrrrriiiiffffiiiicccceeee.
2. The Blower at the same time is drawing Natural or
Propane Gas into the Burner System by negative
pressure through the GGGGaaaassss OOOOrrrriiiiffffiiiicccceeee.
3. The air and gas are thoroughly mixed in the MMMMiiiixxxxiiiinnnngggg
TTTTuuuubbbbeeee.
4. The BBBBlllloooowwwweeeerrrr then forces the air/gas mixture into the
FFFFllllaaaammmmeeee HHHHoooollllddddeeeerrrr in the CCCCoooommmmbbbbuuuussssttttiiiioooonnnn CCCChhhhaaaammmmbbbbeeeerrrr under a
slight positive pressure.
5. The mixture is ignited in the CCCCoooommmmbbbbuuuussssttttiiiioooonnnn
CCCChhhhaaaammmmbbbbeeeerrrr, around the circumference of the
FFFFllllaaaammmmeeeehhhhoooollllddddeeeerrrr. Combustion continues until the pre-
set water temperature is reached.
6. The HHHHeeeeaaaatttt EEEExxxxcccchhhhaaaannnnggggeeeerrrr tubes surrounding the
Burner/Flameholder extract heat from the hot flue
gases and heat the water flowing through the
tubes.
7. The cooled exhaust is collected in a sealed EEEExxxxhhhhaaaauuuusssstttt
PPPPlllleeeennnnuuuummmm, then is discharged out the VVVVeeeennnntttt BBBBooooddddyyyy.
1-5
Gas
Air
1
2
5
3
4
7
6
Exhaust
Gas and Air Flow Through the Heater
Figure 1-5: Air and Gas Flow
SSSSaaaaffffeeeettttyyyy PPPPrrrreeeeccccaaaauuuuttttiiiioooonnnnssss::::
Risk of fire or explosion.
If Combination Gas Control Valve does not open or if
fuel does not ignite properly, DO NOT attempt to over-
ride safety interlocks to force combustion.
Find and
fix fault before operating heater.
