Lochinvar 399 - Manual (Page 43)

Installation and
Service Manual
43
To Turn Off Gas To Appliance
1. Open the front access panel to access control panel.
2. Turn power switch to “OFF” position.
3. Turn the manual gas cock clockwise to the “OFF” position.
FIG. 45 Combination Gas Valve
PROGRAMMING TEMPERATURE
CONTROL
Note: The temperature controller is pre-programmed at the
factory with test settings. Stages per model may vary. These
pre-programmed values are as follows:
Standard Btu/hr Models
399,999 - 500,000
2-Stage (Capable)
650,000 - 990,000 3-Stage (Capable)
1,260,000 - 2,070,000 4-Stage (Capable)
Stage Set Point Differential
1 125°F (52°C) 8°F (5°C)
2 120°F (49°C) 8°F (5°C)
3 115°F (46°C) 8°F (5°C)
4 110°F (43°C) 8°F (5°C)
Re-program the set points and differentials to meet your
system requirements.
The temperature control uses a Liquid Crystal Display (LCD)
for interactive prompting during programming and display of
sensed and assigned values. Programming is accomplished
through the use of the three programming buttons.
Quick Programming Overview
Power Up
After turning the power switch to the “ON” position, the LCD
screen will come on to the “View” menu. The screen will show
the boiler outlet temperature setting (see FIG. 47, page 45).
ƽ
WARNING: Should overheating occur or
the gas fail to shut off, turn off the manual gas
control valve to the unit.
ƽ
WARNING: Return water temperatures
must not be less than 140°F. If lower return
water temperatures are required, follow the
instructions for Low Temperature Return Water
Systems, page 36.