SERVICING
51
If external static pressure is being measured on a furnace to de-
termine airflow, supply static must be taken between the "A" coil
and the furnace.
TOTAL EXTERNAL STATIC
S-204 COIL STATIC PRESSURE DROP
1. Using a draft gauge (inclined manometer), connect the posi-
tive probe underneath the coil and the negative probe above
the coil.
2. A direct reading can be taken of the static pressure drop across
the coil.
3. Consult proper table for quantity of air.
STATIC PRESSURE DROP
If the total external static pressure and/or static pressure drop
exceeds the maximum or minimum allowable statics, check for
closed dampers, dirty filters, undersized or poorly laid out duct
work.
EMERGENCY MODE
HIGH VOLTAGE !
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
When the system shows error code E51, Eb0, Eb9 and Ed2, outdoor
unit is allowed to run the emergency mode disregarding the error
code as the temporary solution. To set the emergency mode, please
change DS2 dipswitch in OFF position as below and reboot the
outdoor unit. In this mode, the system repeats a cycle of 8 minutes
of cooling operation and stops for 10 minutes. During the emer-
gency mode, the outdoor unit doesn’t send the airflow demand to
the indoor unit. Integrated control module must be connected
jumper between R, G, Y1 and Y2.
Note: The emergency mode is not a permanent solution. The sys-
tem should not operate in this mode for a long time.
DS2-1 DS2-2
ON ON Norma l Operation
ON OFF Emergency Mode (Cooling)
OFF ON Emergency Mode (Cooling)
OFF OFF Emergency Mode (Cooling)
Dipswitch Position
Function
Cooling
Start Up
Cooling
8 min
OFF
10 min
100%
OFF
COOLING LOAD
1
2 R
C
G
O
Indoor Unit Integrated Control Module
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