Lochinvar 399 Installation And Service Manual page 48

Hydronic Heating Boilers and
Domestic Water Heaters
OPERATION
To program settings for Mode 1 operation, press in and hold
the three programming buttons for 3 seconds. The screen will
change from the View Menu to the Adjust Menu. "Adjust" will
appear in the upper right corner of the screen. Just under the
word "Adjust" will be either the number 1, 2, or 3. Press the
"+" or "–" button to select the number "1". This places the
control into Mode 1.
Press the "Select" button to scroll through the menu offerings.
Press the "+" or "–" button to change values within each
offering.
See TABLE–Q , page 44 for Mode 1 Adjust Menu settings.
Programming For Mode 2, Water Heating
Operation
Mode 2 is for base water heating operation. A tank sensor is
supplied with the unit. You must connect the supplied tank
sensor to the control and install the sensor into the water
storage tank. If you do not, the controller will default to either
inlet or outlet control (whichever is setup as the controlling
sensor). Once the tank sensor is connected, the controller
automatically selects that sensor as the controlling sensor. See
on installing the tank sensor.
To program settings for Mode 2 operation, press in and hold
the three programming buttons for 3 seconds. The screen will
change from the View Menu to the Adjust Menu. "Adjust" will
appear in the upper right corner of the screen. Press the "+" or
"–" button until the number "2" appears under the word
"Adjust". This places the control into Mode 2.
Press the "Select" button to scroll through the menu offerings.
Press the "+" or "–" button to change values within each
offering.
See TABLE–Q, page 44 for Mode 2 Adjust Menu settings.
Continued
on page 48 for more information
TABLE-S
Programming Worksheet
Stage 1:
Set Point 1_________
Differential 1_________
Stage 2:
Set Point 2_________
Differential 2_________
Stage 3:
Set Point 3_________
Differential 3_________
Stage 4:
Set Point 4_________
Differential 4_________
Programming For Mode 3, Sequenced
Operation
Mode 3 is for sequenced operation. A Building Management
System will sequence the operation of the unit. Most of the
control of the unit will be handled by the Building
Management System.
To program settings for Mode 3 operation, press in and hold
the three programming buttons for 3 seconds. The screen will
change from the View Menu to the Adjust Menu. "Adjust" will
appear in the upper right corner of the screen. Press the "+" or
"–" button until the number "3" appears under the word
"Adjust". This places the control into Mode 3.
Press the "Select" button to scroll through the menu offerings.
Press the "+" or "–" button to change values within each
offering.
See TABLE–Q, page 44 for Mode 3 Adjust Menu settings.
Refer to FIG. 42 for various mode terminal strip connection
options.
Remote Mounting of Sensors
You must mount the outside air temperature sensor outside the
building. To mount remote sensors, follow the guidelines below.
Take care to correctly wire sensors to the unit. Erratic
temperature readings can be caused by poor wiring practices.
Twist the wires between the unit and the remote sensor. Turn
wires at least three or four turns per linear foot of wiring. This
provides common mode rejection of some types of electrical
interferences.
1. Do not route temperature sensor wiring with building power
wiring.
2. Do not locate temperature sensor wiring next to control
contactors.
48
Off at_________
On at_________
Off at_________
On at_________
Off at_________
On at_________
Off at_________
On at_________