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Startup
Startup Procedure
Do not start the air handler or BOILER until ALL Air has
been purged from water lines and air handler pump!
1. Fill the boiler loop with water, but do not start it.
2. Purge all air from the heating boiler.
3. Purge all air from the space-heating loop by closing the
isolation valve on the return leg of the loop and open
the drain to purge air. Open the return leg isolation
valve and then close the drain valve.
4. When there is no bleed screw, we recommend running
on high speed #3 for approximately b to 1 minute.
If this does not work and you can still hear a
'swooshing/swirling' at the pump, then attempt to
pulse the air out of the pump by going back and forth
between high speed and low speed, 10 seconds on
each speed for about 1 minute and that should
eliminate the air within the pump.
Air Handler LED Indications for Temperature
Temperature for 5 sensors
The Air Handler allows the attachment of up to five
sensors.
The LED sequence for displaying five sensors uses a
bicolor LED to indicate the sensor number followed by the
sensor temperature reading. The sequence starts with a
one red blink to indicate sensor T1, this is followed by
the temperature indication using green blinks as described
above. This is followed by a 2-blink red LED indication
for system select. This is followed by a 3 blink red LED
indication for sensor T3. This is followed by the T3
temperature reading using green blinks. This continues up
to 6 red blinks indicating the reading for sensor T6. After
a short delay sequence begins again with 1 red blink.
For example, if sensor T1 is reading 59°F (15°C) and
sensor T3 is reading 75°F (24°C) the sequence will start
with 1 red blink (sensor T1), 1 green blink, 5 green blinks,
2 red blinks (sensor T3), 2 green blinks, 4 green blinks.
The sequence will continue to indicate the temperature, or
status, of sensor T4 through T6.
36
Viessmann AirflowPLUS AH2A Installation, Operating and Service
5. Start the boiler according to the instructions provided
with the boiler. Set the design water temperature and
wait for the system to shut off.
6. Turn on the power to the air handler and set the room
thermostat for heat to energize the fan and pump.
If a gurgling sound is present, it should subside within
one minute. If noise is still present after one minute,
repeat step 3 to purge air as necessary.
7. Check supply and return pipes for temperature
differences to make sure there is flow. There should
be a noticeable difference in temperature between
supply and return lines.
Normal temperature indication
The LED will blink to indicate temperatures between
32°F and 176°F (0°C and 80°C). When the temperature
is below 32°F (0°C) it will indicate 0°C. When the
temperature is above 176°F (80°C) it will indicate 80°C.
Refer to page 38 for fahrenheit conversion.
The temperature is indicated by blinking the most
significant digit followed by the least significant digit. If
the temperature is 79°F (26°C) the led will blink 2 times,
short delay, then 6 times.
When the least significant digit of the temperature is
32°F (0°C), the blink indication will substitute 1. If the
temperature is 86°F (30°C) the LED will blink 3-1, if it is
122°F (50°C) it will blink 5-1.
If the temperature is between 32°F and 48°F (0°C and
9°C), the LED will blink only the least significant digit,
that is, if the temperature is 43°F (6°C) the LED will only
blink 6 times. If the temperature is 32°F (0°C), a 1 will
be substituted, and the LED will blink 1 time.
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