SERVICING
35
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
replaced. 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 building
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 (In
-
door 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 emer-
gency mode if the equipment cannot be immediately fixed.
Cycling power to the equipment may temporarily clear error
codes, but doing so may not fix the underlying problem.
Note: If after initial power up communication 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. Operation
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 normal
mode.
NOTE: In the emergency operation, the operating status will
not be shown in the thermostat status menu or on the out-
door 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 commu-
nication between the indoor unit and thermostat is not
functioning 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 dip switches 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
indoor 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 select
switches S-21 and S-22 from dip switch bank DS-6 on the
indoor control board depending on the heat level required
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).
