Start-up – Lochinvar 800 User Manual

Page 54

Installation & Operation Manual

Start-up

Check flame and combustion

(continued)

Place the boiler into the active position by pressing the
SHUTDOWN button on the display board (FIG. 11-1,
page 61) until BLR:Standby appears in the display
window.

5. Locate the pinhole button above the “T” in the Knight

XL logo on the display board (FIG. 11-1). Insert a thin
wire (such as a paper clip) into the hole and press the
button once and hold for 5 seconds to place the boiler
into Service Mode. In Service Mode the boiler will fire
at ignition speed and will then modulate up to full fire.

6. Insert the probe from a combustion analyzer into the

hole left by the removal of the flue temperature sensor.

7. Once the boiler has modulated up to full fire, measure

the combustion. The values should be in the range
listed in Table 10A below. The CO levels should be less
than 150 ppm for a properly installed unit.

If the combustion is not within the specified range,
reference the Troubleshooting Section of the Knight XL
Service Manual for possible causes and corrective
actions.

Set space heating operation

Determine controlling sensor

For space heating systems, the temperature control can be
based on one of three sensors; the inlet, outlet, or system
supply sensor. The SMART SYSTEM control is programmed
at the factory to control the temperature of the outlet sensor.
The control will automatically switch to the system supply
sensor once it is connected. If it is desired to base the
temperature control on the inlet sensor, the appropriate
parameter must be changed in the control. See the Knight XL
Service Manual for a detailed explanation of this procedure.

Verify space heat circulator mode

The Space Heating Mode controls both the system (primary)
pump (if connected), and the boiler (secondary) pump.
When the SMART SYSTEM control receives a space heating
call for heat, it turns on the system pump. If the boiler is not
heating an indirect DHW (Domestic Hot Water) tank, it also
turns on the boiler pump. After the space heating call for heat
ends, the system pump continues to run for a short period of
time. If the boiler pump was running, it continues to run for
a short period of time as well. These pump delays are factory
set to 30 seconds. If different delays are desired, the
appropriate parameters in the control must be changed. See
the Knight XL Service Manual for a detailed explanation of
this procedure.

Set space heating set point temperature

The UP and DOWN keys may be used during normal
operation to adjust the space heating set point temperature.
Once the desired temperature is displayed, press the
ENTER/RESET key to save the new setting. If the
ENTER/RESET key is not pressed, the new setting will be
used for the current heating cycle only. The old setting will
become active after the current heating cycle ends.

Table 10A Flue Products Chart

Once the combustion analysis is complete, test the
safety shutoff device by turning the manual shutoff
valve to the OFF position and ensuring that the boiler
shuts down and registers an alarm. Open the manual
shutoff valve, reset the control, and return to Service
Mode.

Turn the main power off to the boiler and replace the
flue temperature sensor into the flue pipe connection.

10. Place the boiler back into normal operation.

You must replace the flue gas
temperature sensor to prevent flue gas
spillage into the room. Failure to
comply could result in severe personal
injury, death, or substantial property
damage.

ƽ WARNING

Natural Gas

Propane

8.0% - 10%

3.0% - 6.5%

9.0% - 11%

4.1% - 6.9%