Steffes 612EXT Owner & Installers Manual - Manual (Page 25)

Unit discharges improperly.
FANS RUN
INTERMITTENTLY
DISCHARGE
AIR
TOO WARM
DISCHARGE AIR
TOO COOL
Check for damper jamming and
bimetallic coil assembly (39)
calibration.
Check bimetallic coil
assembly (39) for proper
calibration (see note).
PROBLEM WITH
CORE CHARGING
See Core Charging, Unit
Will Not Charge, flow
chart to troubleshoot.
PROBLEM
PRESENT
OK
Install damper clearancing
bracket, Steffes ETS item
#1140209
If problem persists, replace fan
high limit switch (56).
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
o angle from the front of the fan assembly. The
bimetallic coil of units not equipped with an air
deflector are calibrated at a 65
o 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
bimetallic coil.)
Check unit for proper
amperage draw.
Repair or replace fan
assembly (47).
PROBLEM
PRESENT
OK
Recalibrate bimetallic coil
assembly (39), or repair or
replace fan assembly (47).
Model: S Series Only
Function: Air Delivery
Problem: Improper Air Discharge.
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
Note: For cross reference to number coded components, see figure 7.
Check for damper
jamming or obstruction.
Check for adequate
core temperature
OK