35
5680 011 -10
Viessmann AirflowPLUS AH2A Installation, Operating and Service
Startup
WARNING
This appliance is not intended for installation in a
non conditioned space where the potential may exist
for the water and or drain lines to freeze.
7. Is there an installation manual for the home owner?
8. Is the unit accessible? Are there clearances for service
and component replacement?
9. Is the discharge air stream sensor mounted
downstream of the cooling coil?
10. Is the remote return sensor installed upstream of the
A/C coil if the A/C coil is in the return air duct?
Refer to page 16.
11. Are the supply plenum and return duct/drop
acoustically lined? [at least 6 ft. (1.8 m)] of the return
duct/drop must be lined in addition to the supply
plenum).
12. Is the filter cover in place? Is a clean filter in place?
Is the supplied filter rack installed?
13. If this appliance is installed with air conditioning, the
A/C refrigerant charge and system operation must be
verified by a certified/ licensed mechanic prior to
commissioning.
Quick Check
1. Is the purge valve installed on the return line from the
air handler upstream from the isolation valve?
2. Is the air handler hung and isolated to avoid
transmitting vibration through framing and duct work?
3. Full port isolation valves MUST be provided.
Restrictive valves will limit performance.
4. Is outdoor cooling unit contactor wired to
screw terminals on controller to provide hard-start
protection?
5. Are thermostat connections correct, including cooling
and continuous run connections?
6. Have the packing materials been removed from the
blower and the pump?
1)
REMOVE PACKING MATERIALS FROM LEFT SIDE OF BLOWER
2)
ONLY IN HORIZONTAL CONFIGURATIONS REMOVE THE PACKING IN THE WATER LINE.
3)
BLEED ALL AIR FROM WATER LINES
4)
BLEED AIR FROM END OF CIRCULATOR AT SLOTTED BLEED SCREW GENTLY OPEN BLEED SCREW ABOUT
1/2 TURN UNTIL AIR BLEEDS OUT ENSURE WATER DOES NOT LEAK ONTO CONTROL BOARD IN FAN
COMPARTMENT
5)
DISCHARGE AIR SENSOR INSTALLED DOWNSTREAM OF A/C COIL WHEN A/C COIL INSTALLED IN SUPPLY
DUCT DOWNSTREAM OF AIR HANDLER. REFER TO INSTALLATION INSTRUCTIONS.
OR
REMOTE RETURN AIR SENSOR INSTALLED UPSTREAM OF A/C COIL
IF COIL IS INSTALLED IN RETURN AIR DUCT, UPSTREAM OF AIR HANDLER.
OR
IF A/C COIL IS INSTALLED IN RETURN AIR DUCT UPSTREAM OF AIR HANDLER,
AIR FILTER IS INSTALLED UPSTREAM OF A/C COIL
6)
INITIATE CALL FOR HEAT,
PUMP TURNS ON
FAN TURNS ON
7)
DISCONNECT POWER TO OUTDOOR CONDENSER. INITIATE CALL FOR COOLING, ONCE FAN IS
RUNNING, CONFIRM 24 VOLT OUTPUT AT Y AND C AT COM RELAY ON MAIN CONTROL.
RECONNECT POWER IF TEST SUCCESSFUL
8)
CANCEL CALL FOR COOLING APPROXIMATELY 1 MINUTE LATER, FAN TURNS OFF
Pre-start Checklist
