SERVICING
69
EMERGENCY MODE FOR EEV APPLICABLE INDOOR
UNIT
Emergency mode is to only be used in a situation where
communication between equipment (broken wires) or a
failed thermostat cannot be immediately corrected or re-
placed. This mode will allow for cooling or heating to be
activated without the need of communication wires or a
thermostat. Once corrections have been made to wiring or
the thermostat, emergency mode must be turned off and
the system returned to normal operation (this applies to
both the indoor and outdoor units). Note: Emergency mode
does not control to a specific room temperature set point.
Exact room temperature achieved is related to the build-
ing load at the time emergency mode is activated. This is
only a temporary solution.
At first inspection, if the outdoor unit is displaying one of
the following error codes: E51 (outdoor communication
error), Eb0 (no indoor airflow), Eb9 (low indoor airflow),
Ed2 (Indoor unit is too small and cannot provide airflow of
outdoor unit) or the indoor unit is displaying error code
E77 (no thermostat communications) it is acceptable to
use emergency mode if the equipment cannot be imme-
diately fixed. Cycling power to the equipment may tem-
porarily clear error codes but doing so may not fix the un-
derlying problem. Note: If after initial power up commu-
nication issues occur due to faulty wires or a thermostat
these error codes may not be displayed.
In emergency mode, the unit will function according to
the mode selected on the appropriate dip switches. Op-
eration in emergency mode must be limited to a minimum
and should be viewed as a temporary solution before the
issue with the unit is resolved and system operates in nor-
mal mode.
NOTE: In the emergency operation, the operating status
will not be shown in the thermostat status menu or on the
outdoor 7-segment displays. The 7-segment displays on
indoor control board will display “EE”.
1.
HEATING EMERGENCY MODE
Emergency Heating mode is to be used when communica-
tion between the indoor unit and thermostat are not func-
tioning properly. This mode will run the electric heat strips
independently of any thermostat in one of two modes:
High Heat Level or Low Heat Level. Dip Switch Bank DS-6
(specifically dipswitches S-21 and S-22) on the indoor con-
trol is used to engage emergency heating mode. Default
setting for these two dip switches are in the OFF position
(S21 set to ON and S22 set to ON will enable Low Heat
Level Emergency Mode. S21 set to OFF and S22 set to ON
will enable High Heat Level Emergency Mode). Note: once
equipment has been fixed, these dip switches must be
placed back in the OFF position. During operation, the in-
door fan and electric heater kit will be turned on and off at
following intervals based on the Heat Level selected. 2
stage electric heater kits will be energized in stage 2.
Heating On
Heating Off
8 minutes
8 minutes
7 minutes
15 minutes
High Heat Level
Low Heat Level
Emergency Heat Mode Airflow: DIP switches S-9, S-10, S-
11 and S-12 must be set to the correct size electric heat kit
that has been installed. These are located on dip switch
bank DS-3 of the indoor control. See the Switch Bank DS-3
Indoor Control Board Settings table to properly select
heater kit size.
To activate heating emergency mode, appropriately, se-
lect switches S-21 and S-22 from dip switch bank DS- 6 on
the indoor control board depending on the heat level re-
quired in accordance with the Switch Bank DS-6 Indoor
Control Board Settings table.
NOTE: During the heating emergency mode, outdoor unit
must stop operation. Once the communication is estab-
lished, heating emergency mode must be terminated so
that the system resumes operation in normal mode. To
eliminate the heating emergency mode, dip switches S-21
and S-22 from dip switch bank DS-6 on the indoor control
board must be set back to default factory settings (normal
operating mode).
