Steffes 612EXT Troubleshooting Guide - Manual (Page 7)

DISCHARGE AIR
TOO COOL
Check for adequate core
temperature.
Check for damper
jamming or
obstruction.
Refer to "Unit Charges
Improperly" flow chart
on Page 2 of this manual
to troubleshoot.
Check bimetallic coil
assembly (39) for
proper calibration (see
note below).
Repair or replace
fan assembly (47).
Problem
Present
Check unit for proper amperage
draw and refer to "Unit Charges
Improperly" flow chart on Page
2 of this manual to troubleshoot.
OK
MODEL: EXT
FUNCTION: Air Delivery
PROBLEM: Discharge Air too Cool
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
NOTE: To test the bimetallic coil assembly, it must be
completely cold. Either allow room unit to cool completely or
remove fan assembly and cool to room temperature. Once the
coil is cold, disconnect the damper linkage and let the bimetallic
coil go to its relaxed position. The bimetallic coil on units
equipped with air deflectors should be calibrated at a 90 degree
angle from the front of the fan assembly. The bimetallic coil of
units not equipped with an air deflector are calibrated at a 65
degree angle from the front of the fan assembly. Use the
cutout gauge on the left for checking this calibration. (To
determine whether the unit is equipped with an air deflector,
these deflectors would be located in fan assembly behind
bitmetallic coil.
OK
Page 6
Problem with
Core Charging
OK
Recalibrate
bimetallic coil.
Out
of Calibration