Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 7)

7
3.1 Component Listing - Refer to diagrams on
following pages.
1. User Interface Displays information regarding boiler
condition. Allows adjustment of boiler operating
parameters. NOTE: Does not replace thermostat used
to control central heating space.
2. Combustion Air Inlet (2"/3") See section 6.
3. Return Water From Heating System (In)
Connection supplied at bottom of boiler. See section 5.
4. Low Voltage Terminal Strip Connection of all low
voltage wiring, including thermostat.
5. Igniter
6. Flame Sensor
7. Sight Glass Permits observation of burner flame.
8. Burner (see page 40)
9. Heat Exchanger
10. Condensate Collector
11. Return Water Temperature Sensor
12. Drain Valve (see page 14)
13. Internal Primary Loop Ball Valve
14. Supply Water Outlet to Heating System (Out)
Connections supplied for connecting from bottom of
boiler. See section 5.
15. Vent Temperature Sensor
16. Condensate Drain Boiler produces a liquid
(condensate) as a by-product of combustion. Condensate
must be piped to appropriate drain. See section 6.
17. Heat Exchanger Pump
18. Gas Shutoff Valve Fuel supply isolation during
servicing. See section 7
19. Combustion Air Blower Delivers proper quantity of
combustion air, receives fuel from gas valve, mixes air
and fuel sending mixture to burner for combustion.
20. Gas (Control) Valve Delivers proper quantity of fuel
to Combustion Air Blower. See section 7.
21. Supply Water Temperature Sensor and High Limit
Switch
22. Low Water Cutoff Senses inadequate quantity of
water. Turns off boiler before damage can occur.
23. Safety Relief Valve Factory supplied, Field installed.
See section 5.
24. High Voltage Junction Box For connection of 120V
components. See section 8.
25. Vent Connector See section 6.
26. Gas Connection See section 7.
27. Wall Hanging Support Bracket (see page 12)
Integral to boiler. Allows wall mounting when used
with supplied wall mounting bracket. See section 4.
28. Air Vent
29. Boiler Control Module
30. Lower Jacket Panel Gently pull upward then forward
to access.
31. Transformer Supplies 24V power to low water cutoff.
32. Flue Air Mixture Pressure Test Port - Not available
on all models.
33. Combustion Analysis Test Port
34. Internal Pump Relay - Not available on all models.
35. Heat Exchanger Surface Temperature Switch
36. ASME Plate
3 - COMPONENT LISTING