Troubleshooting; Ntc Temperature Sensor Chart - Greenheck 474706 Reference Manual

Display is hard to read.
Remote display panel
displays "NO LINK" or
is blank.
Red alarm button is
flashing.
Controller resets itself
or is not on.
Menus are locked with
a password.
Temperature sensor
failure.
120
110
100
90
80
70
60
50
40
30
20
10
0
4 6
28
DDC Controller for Tempered Air Products

Troubleshooting

Prg Esc
Unit Controller Display: Hold
pressing DOWN or
Prg Esc
Remote Display: Hold
pressing DOWN or
Prg Esc
Prg
Hold DOWN, UP and
to 32. The display requires a standard 24 AWG six conductor phone cable
connected to the unit controller.
Press the ALARM button to review and clear unit alarms. Enter the DATA
Prg Esc
LOGGER menu to view previous alarms.
Check the supply voltage to the controller at terminals G-G0. The board requires
24VAC. Check the 24VAC transformer in the unit control center.
The factory default Manufacturer Password = 1000.
The factory default Service Password = 1000.
Check the analog input terminal block (labeled terminals B1, B2, B3, etc) for loose
wires. Disconnect temperature sensors to check sensor resistance.

NTC Temperature Sensor Chart

8 10 12 14
Resistance (kΩ)
Prg Esc
Prg Esc
ESC and ENTER at the same time, while
Prg Esc
UP to adjust display contrast.
Prg Esc
ALARM, PRG, and
Prg Esc
Prg Esc Prg
UP to adjust display contrast.
Esc Prg Esc
ENTER for 4 seconds. Set the display address
16 18 20
ESC at the same time, while
Esc
22 24 26 28
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