Lochinvar 1.5 - Manual (Page 21)

21
ModBus Instructions
6
Troubleshooting
(continued)
Installation / Replacement Procedure
1
3
2
UNPLUG THREE (3) WIRE HARNESSES
Figure 6-1_MTR01 Control Board
1. Turn OFF the main electrical power to the appliance.
2. Turn OFF the main manual gas shutoff to the appliance.
3. Unplug the three (3) wire harnesses on the MTR01 control
board (see FIG. 6-1).
4. Unscrew the four (4) mounting nuts on the MTR01 control
board and set aside. Remove the MTR01 control board (see
FIG. 6-2).
5. Replace / install the new MTR01 control board.
6. Replace the four (4) mounting nuts removed in Step 4.
7. Reconnect all three (3) wire harnesses unplugged in Step
3.
8. Turn on the main electrical power and the main manual gas
shutoff to the appliance.
9. Confi gure the MTR01 control board and unit controls per
this manual and resume operation.
UNSCREW THE FOUR (4)
MOUNTING NUTS ON THE MODBUS
CONTROL BOARD (MTR01) AND SET
ASIDE TO SECURE THE
NEW MTR01 CONTROL BOARD
TO THE CONTROL PANEL
Figure 6-2_Control Panel w/MTR01 Control Board