Lochinvar 399 - Manual (Page 45)

Installation and
Service Manual
45
STG MODE
Used to distinguish between single and dual ignition module
appliances. Applies ONLY on 650,000, 750,000, and 990,000
Btu/hr models.
OUTDR DSGN
Design outdoor air temperature used in the heat loss
calculations.
BOIL START
Starting temperature of the boiler heating curve at outdoor
starting temperature.
BOIL DSGN
Design heating supply water temperature.
WWSD
Set temperature for warm weather shut down.
BOIL MIN
Set minimum boiler target supply temperature.
BOIL MASS
Set boiler’s thermal mass. The lower the value, the shorter the
interstage delay.
BOIL DIFF
Set boiler differential during outdoor reset operation.
Set Point TARGET
Set point target whenever a reset override is present.
Ignition Systems and Stages
The 399,999 - 500,000 Btu/hr models have one ignition system
and 2 stages of operation. The 650,000 - 750,000 Btu/hr
models have one ignition system and 3 stages of operation. On
the 990,000 Btu/hr model, there are two ignition systems and
3 stages of operation.
Note: For Stage Mode Delay on the 650,000 - 750,000 Btu/hr
models set Stage Mode to 1. On the 990,000 Btu/hr model, set
Stage Mode to 2.
The 1,260,000 - 2,070,000 Btu/hr models have two ignition
systems and 4 stages of operation
On models with two ignition systems, ignition system 1
controls stages 1 and 2 and ignition system 2 controls stages 3
and 4. Stage 2 is tied to stage 1 and stage 4 is tied to stage 3.
You can program the control to operate each ignition system
independently. You can also program the ignition stage
sequence as 1, 2, 3, and 4, or 3, 4, 1, and 2. This allows greater
programming flexibility to meet your individual needs.
Note: One ignition system controls 1 - 3 stages on the 399,999
- 750,000 Btu/hr models.
Operating Modes
There are three operating modes on the temperature control:
Mode 1 - Boiler Operation
Mode 2 - Water Heater Operation
Mode 3 - Sequenced Operation
You can program the different values within each mode to
control the operation, stages, differentials, water temperature,
and pump operation.
Programming Buttons
Program and navigate the temperature control using the three
programming buttons located under the LCD screen. The
buttons are labeled “SELECT”, “+”, and “–” (see FIG. 46).
FIG. 46 Programming Buttons
View Menu
This is the default screen that appears after start up. The word
“View” appears in the upper right part of the screen (FIG. 47).
The View Menu provides current operational information.
To view the operational information, press the “Select” button
to scroll through the different areas. TABLE–R, page 44 shows
the various View Menu information areas.
To view the various settings without reprogramming the
controller, press and hold the “Select” button for at least three
seconds. The controller will display in one-second intervals
each setting currently programmed into the controller.
FIG. 47 View Menu
Adjust Menu
The Adjust Menu allows you to change settings or modes. The
word “Adjust” appears in the upper right part of the screen. The
unit will shut down while in the Adjust mode.
To activate the Adjust Menu, press in and hold all three
programming buttons for three seconds. The LCD screen will
change from the “View” menu to the “Adjust” menu. The
operating mode will appear as either the number 1, 2, or 3, just
under the word “Adjust” (see FIG. 48).
FIG. 48 Adjust Menu