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How to Install the P-749 Controller
1. Retrieve and record any settings desired from the old controller, if possible. Enter Installer
Setup mode as per step 13 below. Settings can be recorded in the column provided in Fig. 3.
2. Remove any call for heat, and remove power from the boiler / water heater.
3. Remove cabinet front door panel.
4. Pull forward the bottom tray which holds the controller.
5. Disconnect the electrical connections from the old board: the three white plugs require
unlatching their clips to be lifted out. The green terminal strips can be removed by pulling
upward. Needlenose pliers are recommended for removing the five ground connectors.
6. Note that the entire tray can now be easily removed from the boiler if desired. Undo and
set aside for re-use the two Phillips screws on the underside of the controller tray. Remove old
controller from tray.
7. Place the replacement board in the original board’s position, so buttons are centred in their
holes and mounting holes align. Install the two screws for the board chassis. Confirm that the
front panel buttons engage with the new controller (you should feel and hear that the buttons
click when pressed).
8. Reinsert boiler tray if necessary. Attach the grounding wires, terminal strips and plugs as
the original board was wired. Make sure plugs are fully engaged.
9. Close the tray, power up the board and wait ten seconds. The board will display dashes.
10. Press the service button [wre and the reset buttons con] simultaneously to get zeros in the
Main and Service windows. Press the + button below the main window repeatedly until a “25”
is displayed. Press the service button once to enter Model Setup menu.
11. The main window will display “PA”; by pressing the + button, choose the appropriate PA
type according to the model of the boiler. See Figure 2. Save the choice by pressing the Reset
button . A “P” will display for about 5 seconds.
12. The boiler controller is now set up for the correct model. The final step will be to enter
operational parameters in the User and Installer menus. The user menu is accessible simply by
pressing the Thermometer icon for two seconds. The LED by the radiator icon indicates
the +/- buttons can be used to adjust the Space Heating water temperature (see publication
DC /HC Controller Manual for more information). Toggle to enter the DHW temperature setup.
Saving changes is done by pressing the Reset button .
13. Enter the Installer menus by pressing the service on] and the reset buttons [on]
simultaneously to get zeros in the display windows. Press the + button until a “15” is displayed
in the Main window. Press the service button to enter Parameter 1, System Type. See
Figure 3 for a complete list of parameters. A column is provided for the Installer to record
settings. Use the service button to scroll through the parameters, the +/- buttons to
adjust values, and the Reset button to save all changes. If further information is required
see the IBC publication DC / HC Controller Manual.
Note: after installation, upon powering up the boiler, the board will briefly display r 2.10 and a PA x-.
This is the software revision number and the first digit of the selected PA type .
Better
Boilers
INSTRUCTIONAL
NOTE
P-749 Controller Replacement Kit
DC / HC Series (All Models)
Figure 2: Parameter
Types by Model
PA 46
DC 33-124
PA 45
HC 33-124
PA 44
DC 29-106
PA 43
HC 29-106
PA 42
DC 23-84
PA 41
HC 23-84
PA 31
HC 13-50
PA 22
DC 33-160
PA 21
HC 33-160
PA 12
DC 20-125
PA 11
HC 20-125
PA 62
DC 15-96
PA 61
HC 15-96
PA 52
DC 15-95
PA 51
HC 15-95
