66324-YIM-B-1004
Unitary Products Group 23
TROUBLESHOOTING
NOTE: Before troubleshooting, familiarize yourself with the
START-UP and CHECKOUT procedures.
FIGURE 15 - TROUBLESHOOTING
Troubleshooting of components necessarily
requires opening the electrical control box with the
power connected to the unit. Use extreme care
when working with the live circuits! Check the unit
nameplate for the correct line voltage and set the
volt meter to the correct range before making any
connections with line terminals.
If the variable speed motor found in DNH060 mod-
els operates erratically check the fan control board
for the presence of a break-off tab. Remove tab if
present.
The wire number or color and terminal designa-
tions referred to may vary. Check the wiring label
inside the control box access panel for the correct
wiring.
