Electro Industries EM-MC Series, Инструкция по установке и эксплуатации, Страница: 26 / 34

07/29/2019 24 EI915
Troubleshooting Solution
Display is blank and nothing
is turning on

This unit includes a 2A fuse located on the control board, verify it is
in good working condition.

If 2A fuse is open, replace.

If 2A fuse is not open, check the primary and secondary side of the
transformer to ensure power is available.
 If good primary and secondary voltage is detected, disconnect all
low voltage wires (not including 24VAC secondary side of
transformer) from the control module (make sure there no
load/current through any monitoring / connected CTs).

If screen is still blank, replace board.

If screen illuminates and displays “FAN OFF”, there is an
issue with low voltage wiring.
Unit is not producing heat  Check unit display. Display should show “FAN OFF” or
temperature screen.

If screen is blank, check 2A fuse.
 If screen displays the “FAN OFF” screen, unit is not being told to
turn on.

Verify field low voltage wiring is correct
o
CT or R & W

If screen displays temperature screen, compare the OUT and DT, if
ST > DT, this Make-Up Air unit will not engage the electric
elements.
 Check the “message” LED. If blinking, see section labeled Start
Up Inspection & Observations – Message Center for further
instruction.

Manual reset limit may be open.

Manual reset limit switch located in control box.
 Remember the heating is locked out when entering air temperature
is greater than 55°F (12.7°C). This cannot be bypassed.
Unit is not delivering
adequate warm air
temperature
 Clean the filter (lack of airflow will cause the unit to reduce its
heating output).
 Check the “message” LED. If blinking, see section labeled Start
Up Inspection & Observations – Message Center for further
instruction.
 Verify correct system setup which includes but is not limited to the
below:

SET POINT DIAL/HI LO Jumper

CONFIGURATION DIAL

See the Setup and Programming Instructions for further setup
details
 Check source amp draw to verify all elements are working correctly
The “Status LED” is
blinking  See section labeled Start Up Inspection & Observations –
Message Center for further instruction.