OPERATING THE SYSTEM WITH QT CONTROLS
Blizzard
Tur
bo Split System Manual
20
L-3448 ENGLISH
H
IGH
F
AN
S
PEED
A
DJUSTMENT
Factory Default: 85
The high fan speed adjustment allows the user to set the maximum high-speed voltage to the threshold of the blower high-
speed response.
To adjust the high fan speed:
While in OFF mode, enter program mode by pressing MODE and minus (-) keys for three seconds. The display will flash "PO"
during the three seconds. After the three-second flash, a flashing 1 will appear on the display, which is function #1. While in
program mode, the OFF LED will flash, which indicates program mode. Scroll through the function numbers by pressing the
plus (+) or minus (-) key until #6 is displayed. Press the MODE key and the current value is displayed. All fan speed LEDs will
flash. Factory default is 85. Range is 41 to 99. Use the plus (+) or minus (-) key to change the value and then, press fan key
once to save information and continue programming or press the fan key twice to save and exit program mode.
F
AN
M
ODE
Factory Default: Continuous
You can select the continuous fan operation or instruct the fan to cycle on and off with the system compressor.
To select continuous or intermittent fan:
While in OFF mode, enter program mode by pressing MODE and minus (-) keys for three seconds. The display will flash "PO"
during the three seconds. After the three-second flash, a flashing 1 will appear on the display, which is function #1. While in
program mode, the OFF LED will flash, which indicates program mode. Scroll through the function numbers by pressing the
plus (+) or minus (-) key until #7 is displayed. Press the MODE key and the current value is displayed: C or I. Factory default is
C. Use the plus (+) or minus (-) key to change the value to I (intermittent) and then, press fan key once to save information and
continue programming or press the fan key twice to save and exit programming mode.
NOTE: For best operation using intermittent fan mode, relocate internal air sensor (thermister) from the return air duct
to an inside wall to best sense room air temperature. Check with your dealer or call the Dometic Applications
Department for more information.
AC L
INE
V
OLTAGE
C
ALIBRATION
The Qt Control/Display assembly has a built- in voltmeter that senses AC line voltage. The microprocessor automatically
responds to sustain high and low voltages by shutting down the air conditioning system to prevent component damage. At
installation, the Qt Control/Display is calibrated to line voltage /- 1%.
Low AC shutdown during COOL mode
: If incoming voltage is
104VAC (on a 115VAC system) for greater than three minutes,
the system will shut down and "LO/AC" will flash on the display. If incoming voltage is
207 (on a 230VAC system) for greater
than three minutes, the system will shut down and "LO/AC" will flash on the display.
Low AC shutdown during HEAT mode
: If incoming voltage is
95VAC (on a 115VAC system) for greater than three minutes, the
system will shut down and "LO/AC" will flash on the display. If incoming voltage is
200VAC (on a 230VAC system) for greater
than three minutes, the system will shut down and "LO/ AC" will flash on the display.
High AC shutdown during COOL or HEAT mode
: If incoming voltage is
127VAC (on a 115VAC system) for greater than three
minutes, the system will shut down and "HI/AC" will flash on the display. If incoming voltage is
246VAC (on a 230VAC system)
for greater than three minutes, the system will shut down and "HI/AC" will flash on the display.
T
O
C
HECK
OR
C
ALIBRATE
AC L
INE
V
OLTAGE
:
Turn off all on-board AC loads including the air conditioning unit and measure the line voltage at the Dometic power electrical
box input terminals with an accurate voltmeter. While in OFF mode, enter program mode by pressing MODE and minus (-) keys
for three seconds. The display will flash "PO" during the three seconds. After the three-second flash, a flashing 1 will appear on
the display, which is function #1. While in programming mode, the OFF LED will flash, which indicates program mode. Scroll
through the function numbers by pressing the plus (+) or minus (-) key until #8 is displayed. Press the MODE key and the last
two digits of the current value are displayed. If voltage is not correct, use the plus (+) or minus (-) key to enter the correct value
and then, press the fan key once to save information and continue programming or press the fan key twice to save and exit
program mode.
G
ENERATOR
O
UTPUT
C
ALIBRATIONS
In order to perform this check, run unit in COOL mode with the compressor energized. Measure the voltage and frequency at
the input terminals inside the Dometic power electrical box. Check the voltage at the Qt Control/Display as stated above. Ensure
that the generator's output is 104-127VAC and 57-63 Hz. If not, adjust the generator using the manufacturer's recommendations
to within the above given guidelines.
