Lochinvar 000 - 500 - Manual (Page 20)

FIG. 26 Intermittent Pilot System F9/M9 Control Panel
FIG. 27 Control Panel Assembly 500,000 Btu/hr
Operating Temperature Control
Locating Temperature Control
Remove the control panel door on the front of the unit in
order to locate and access the temperature control.
Temperature Control Settings
There are three setting knobs on the temperature control
unless your unit is specified as a boiler only with an
outdoor air reset option. If your unit is a boiler only with an
outdoor air reset option, there are additional controls for
this option. They are explained under Outdoor Air Reset
Option, page 22.
The three setting knobs on the temperature control are for
Set point, Differential, and High-Fire Offset (see
Figure 28).
FIG. 28 Temperature Control
Maximum Set Point Determination
The maximum set point for the control is factory set.
Boilers can be set to 240°F max., water heaters are set to
190°F max., and specialty state and local codes to 200°F.
These maximum set points are established by cutting the
OJ1 and OJ2 jumpers located on the right side of the
temperature controller. The maximum set point is
determined as shown below in TABLE-K.
20
TEMPERATURE ADJUSTMENT
The temperature controller is pre-set at the factory with
test settings. You may need to adjust the settings to meet
your specific needs.
Return water temperatures must not be less than
140°F. If lower return water temperatures are
required, follow the instructions for
Low
Temperature Bypass Requirements or Three-Way
Valves, see page 35.
ƽ
WARNING
Max.
OJ1 OJ2 Set Point
Connected Connected 240°F
Cut Connected 190°F
Connected Cut 200°F
Cut Cut 160°F
TABLE K
Maximum Set point Determination
Anytime that OJ1 is the only jumper cut, a new
overlay is required under the Set Point knob on the
temperature controller because the scale has changed
to a maximum of 190°F.
Anytime the OJ2 jumper is cut (with or without OJ1),
a new overlay is required under the Set Point knob on
the temperature controller because the scale has
changed to a maximum of 200°F.
NOTE:
NOTE: