All of the following parameters are controlled by a storage tank temperature sensor:
• Setpoint
= Target Temperature (120°F) Low fire only above this point
• Offset
= Off Setpoint (3) = 123°F off
• Hysterese
= On Setpoint (8) (120 + 3 - 8 = 115°F)
• Proportional Band
= Modulation range (4) (120 - 4 = 116°F, modulation begins)
The appliance turns on at 115°F and when the temperature reaches 116°F the flame will begin to modulate down
(approximately 25% of the modulation range per degree F of increase in this example). At 120°F, it will be at low
fire and will remain there unless the temperature drops below 120°F and it will modulate back up. If it continues to
increase, it will shut down at 123°F.
WATER HEATER OPERATING SAMPLE
Modulation Range
Setpoint
Se Offset
Se Offset - Hysterese
Bandwidth
Burner On
Burner Off
115°
119°
120°
121°
122°
123°
124°
125°
126°
116°
118°
117°
Temperature
Low Fire
53
PART 6. START-UP PROCEDURES
Summary of Contents for XL800
Page 6: ...6 PART 1 GENERAL INFORMATION As a Stand Alone Appliance HOT CONTROL MENU NAVIGATION ...
Page 7: ...7 PART 1 GENERAL INFORMATION Appliance as Part of a Cascade HOT CONTROL MENU NAVIGATION ...
Page 19: ...19 PART 2 ELECTRICAL B INTERNAL WIRING CONNECTION continued XL BCB LAYOUT ...
Page 21: ...21 PART 2 ELECTRICAL XL CASCADE BOX ...
Page 31: ...31 PART 4 VENTING Direct Vent Terminal Clearances ...
Page 33: ...33 PART 4 VENTING Other Than Direct Vent Terminal Clearances continued ...
Page 69: ...69 PART 10 PARTS BREAKDOWN 1A 1B PART 10 PARTS BREAKDOWN 2 ...
Page 70: ...70 PART 10 PARTS BREAKDOWN 3 4 5 6 7 8 9A 9B 9C 10 4 ...