– 25 –
User Interface (UI) Board
User Interface (UI) Board Diagnosing
If a user interface (UI) board were to fail, the
Zoneline will not operate and the display will be
blank.
Verify Voltage to User Interface Board
Verify voltage by gaining access to the main
control board at the J402.
• Pin 1 (
gray
) to pin 2 (
orange
): 24 VAC
Verify Voltage to Main Control Board
208/230 VAC
Verify voltage on 208/230 VAC PTAC's by gaining
access to the main control.
• J102 (
green
) Ground to J306 (
red/black
) L1:
120 VAC
• J102 (
green
) Ground to J309 (
orange/black
)
L2: 120 VAC
• J306 (
red/black
) L1 to J309 (
orange/black
)
L2: 230 VAC
265 VAC
• J102 (
green
) Ground to J306 (
red/black
) L1:
265 VAC
• J102 (
green
) Ground to J309 (
orange/black
)
Neutral: 0 VAC
• J306 (
red/black
) L1 to J309 (
orange/black
)
Neutral: 265 VAC
Main User Interface Board Removal
1. Remove junction box cover and main control
board cover. Remove two 1/4-in. screws from
the top of the user interface display.
2. Push on all three retaining tabs to release the
user interface board from it cover.
1/4" Screws
Tabs
Tabs
Tabs
