Lochinvar 999 - 750 Programming For Mode 2, Water Heating Operation, Remote Mounting of Sensors

Hydronic Heating Boilers and Domestic Water Heaters

OPERATION Continued

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 Remote Mounting of Sensors on page 48 for more information 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.

TABLE-S

Programming Worksheet

Stage 1:
Set Point 1_________	Off at_________
Differential 1_________	On at_________
Stage 2:
Set Point 2_________	Off at_________
Differential 2_________	On at_________
Stage 3:
Set Point 3_________	Off at_________
Differential 3_________	On at_________
Stage 4:
Set Point 4_________	Off at_________
Differential 4_________	On at_________

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.

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