The Outdoor Crest - How It Works - Lochinvar Crest OFN0751 Supplemental Manual

The Outdoor Crest - How it works...

1. Front access panels
Provides access to the controls compartment.
2. Top access panel
Provides access to the burner compartment.
3. Optional outdoor air inlet hood assembly
separately with outdoor installation kits)
The hood assembly is required when installing outdoors for
combustion air to prevent rain and debris from entering the air
inlet.
4. Boiler drain connection
Location from which the heat exchanger can be drained.
5. Condensate drain connection
The condensate drain connection provides a connection
point to install a condensate drain line using flexible hose
provided.
6. Condensate trap box
installation kits)
The condensate trap box comes assembled inside the outdoor
installation kit. The condensate trap box is required for
outdoor installations to protect/house the condensate trap.
7. Control module (on control panel assembly)
The control module responds to internal and external signals
and controls the blower, gas valves, and pump(s), depending on
the application, to meet the heating demand.
8. Electronic display
Digital controls with SMART TOUCH screen technology, full
color display, and an 8" user interface screen.
9. Gas connection pipe
The gas connection pipe is a threaded black iron pipe
connection (see Gas Connections Section for specific model
pipe size requirements). This pipe should be connected to the
incoming gas supply to deliver gas to the boiler.
10. Gas shutoff valve (inside unit)
The manual gas shutoff valve is used to isolate the boiler gas
train from the gas supply.
11. Gas valves
The gas valves sense the negative pressure created by the
blower, allowing gas to flow only if the gas valves are powered
and combustion air is flowing.
12. Condensate trap
The condensate trap is sized for a 1" PVC outlet connection
pipe.
13. Line voltage junction box
The line voltage junction box contains the connection points
for the line voltage power to the boiler (and pumps if used).
14. Line voltage wiring connections
Conduit connection points for the high voltage junction box.
15. Low gas pressure switch
Monitors gas supply pressure to the boiler and shuts the boiler
down in the event a low gas pressure condition
occurs.
16. High gas pressure switch
Monitors gas supply pressure to the boiler and shuts the boiler
down in the event a high gas pressure condition
occurs.
17. Low voltage connection board(s)
Connection boards used to connect external low voltage
devices.
4
(shipped
(shipped separately with outdoor
Outdoor Crest Supplemental Manual
18. Low voltage wiring connections (knockouts)
Conduit connection points for the low voltage connection
boards.
19. Power switch
The On/Off power switch provides the ability to turn line voltage
power to the boiler on and off.
20. Relief valve
The safety relief valve protects the heat exchanger from an over
pressure condition. The boiler comes with a 50 PSI relief valve as
standard equipment. Optional settings are available.
21. Reset switch
Reset switch for the low water cutoff. Hold the switch for 10
seconds to reset.
22. Test switch
The test switch permits manual triggering of the LWCO
safety circuit to test the contacts and evaluate the integrity of the
circuit. Hold the switch for 10 seconds to test.
23. Firetube heat exchanger
High grade stainless steel WAVE
heat from flue gases and transfers it directly into boiler water.
24. Temperature and pressure gauge
Monitors the outlet temperature of the boiler as well as the system
water pressure.
25. Venturi (not shown)
The venturi controls air and gas flow into the burner.
26. Water inlet
An ANSI flange connects the return water from the system to the
heat exchanger.
27. Water outlet
An ANSI flange connects the hot water supply from the boiler to
the system.
28. Flame inspection window (not shown)
Two large high temperature quartz observation windows
provide views of the burner surface during firing.
29. Air metering valve
The air metering valve is used to control the amount of air used
when firing.
30. Air metering valve air pressure switch
The air metering valve air pressure switch is used to ensure the air
metering valve is open when firing gas valve 2.
31. Vent support
(shipped in the ship loose parts box with each
unit)
The vent support is required for outdoor installations to support
the vent piping.
32. Air pressure switch
The air pressure switch detects blocked flue/vent conditions.
TM firetube design that extracts