Page 14
TABLE 5 Continued
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
E 406
LSOM - Compressor open start circuit.
Required amount of current is not passing through
Start current transformer. Clears the error after cur
rent is sensed in START sensor, or after power re
set.
E 407
LSOM - Compressor open run circuit.
Required amount of current is not passing through
Run current transformer. Clears the error after cur
rent is sensed in RUN sensor, or 1 normal compres
sor run cycle, or after power reset.
E 408
LSOM - Compressor contactor is welded.
Compressor runs continuously. Clears the error
after 1 normal compressor run cycle or after power
reset.
E 409
LSOM - Compressor low voltage.
Secondary voltage is below 18VAC. After 10 min
utes, operation is discontinued. Clears the code
after voltage is higher than 20 VAC for 2 seconds or
after power reset.
DIP Switch Settings
NOTE -
All communicating are set at the communicating
thermostat. See thermostat installation instruction. In a
communication system all DIP switch and clippable link
settings are ignored. For conventional thermostats pro
ceed with DIP switch and clippable link settings as outlined
in the following.
Heating Operation DIP Switch Settings
Switch 1 -- Thermostat Selection --
This unit may be
used with either a single-stage or two-stage thermostat.
The thermostat selection is made using a DIP switch which
must be properly positioned for the particular application.
The DIP switch is factory-positioned for use with a two-
stage thermostat. If a single-stage thermostat is to be used,
the DIP switch must be repositioned.
a -
Select “OFF
” for two-stage heating operation con
trolled by a two-stage heating thermostat (factory set
ting);
b -
Select “ON
” for two-stage heating operation con
trolled by a single-stage heating thermostat. This set
ting provides a timed delay before second-stage heat
is initiated.
Switch 2 -- Second Stage Delay (Used with Single-
Stage Thermostat Only) --
This switch is used to deter
mine the second stage on delay when a single-stage ther
mostat is being used. The switch is factory-set in the OFF
position, which provides a 7-minute delay before second-
stage heat is initiated. If the switch is toggled to the ON
position, it will provide a 12-minute delay before second-
stage heat is initiated. This switch is only activated when
the thermostat selector jumper is positioned for SINGLE-
stage thermostat use.
Switches 3 and 4 -- Blower-Off Delay --
The blower-on
delay of 30 seconds is not adjustable. The blower-off delay
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switches 3
and 4 on the integrated control. The unit is shipped from the
factory with a blower-off delay of 90 seconds. The blower
off delay affects comfort and is adjustable to satisfy individ
ual applications. Adjust the blower off delay to achieve a
supply air temperature between 90° and 110°F at the exact
moment that the blower is de-energized. Longer off delay
settings provide lower supply air temperatures; shorter set
tings provide higher supply air temperatures.Table 6 pro
vides the blower off timings that will result from different
switch settings.
TABLE 6
Blower Off Delay Switch Settings
Blower Off Delay
(Seconds)
Switch 3
Switch 4
60
On
Off
90 (Factory)
Off
Off
120
Off
On
180
On
On
Indoor Blower Operation DIP Switch Settings
Switches 5 and 6 -- Cooling Mode Blower Speed --
The
unit is shipped from the factory with the dip switches posi
tioned for high speed (4) indoor blower motor operation
during the cooling mode. Table 7 provides the cooling
mode blower speeds that will result from different switch
settings. Switches 5 and 6 set the blower cfm for second-
stage cool. The integrated control automatically ramps
down to 70% of the second-stage cfm for first-stage cfm.
Refer to tables for corresponding cfm values.
TABLE 7
Cooling Mode Blower Speeds
Speed
Switch 5
Switch 6
Low
On
On
Medium Low
Off
On
Medium High
On
Off
High (Factory)
Off
Off
Switches 7 and 8 -- Cooling Blower Speed Adjustment
--
The unit is shipped from the factory with the dip switches
positioned for NORMAL (no) adjustment. The dip switches
may be positioned to adjust the blower speed by +10% or
