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15
Contractor Responsibility
The installing contractor must be certain that:
•
All supply and return air ductwork is in place, properly
sealed, and corresponds with installation instructions.
•
All thermostats are mounted and wired in accordance
with installation instructions.
•
All electric power, all gas, hot water or steam line
connections, and the condensate drain installation
have been made to each unit on the job. These
main supply lines must be functional and capable of
operating all units simultaneously.
•
Requirements are met for venting and combustion air.
•
Air filters are in place.
•
Input rate and temperature rise are adjusted per rating
plate.
Roof Curb Installation Check
Inspect the roof curb for correct installation. The unit and
curb assembly should be level. Inspect the flashing of the
roof mounting curb to the roof, especially at the corners, for
good workmanship. Also check for leaks around gaskets.
Note any deficiencies in a separate report and forward to
the contractor.
Obstructions, Fan Clearance and Wiring
Remove any extraneous construction and shipping
materials that may be found during this procedure. Rotate
all fans manually to check for proper clearances and that
they rotate freely. Check for bolts and screws that may
have jarred loose during shipment to the job site. Re-
tighten if necessary. Re-tighten all electrical connections.
Field Duct Connections
Verify that all duct connections are tight and that there is no
air bypass between supply and return.
Filter Section Check
Remove filter section access panels and check that filters
are properly installed. Note airflow arrows on filter frames.
Pre-startup Precautions
It is important to your safety that the unit has been properly
grounded during installation. Check ground lug connection
in main control box for tightness prior to closing circuit
breaker or disconnect switch. Verify that supply voltage
on line side of disconnect agrees with voltage on unit
identification plate and is within the utilization voltage
range as indicated in Appendix B Electrical Data.
System Voltage -
That nominal voltage value assigned
to a circuit or system for the purpose of designating its
voltage class.
Nameplate Voltage -
That voltage assigned to a piece of
equipment for the purpose of designating its voltage class
and for the purpose of defining the minimum and maximum
voltage at which the equipment will operate.
Utilization Voltage -
The voltage of the line terminals
of the equipment at which the equipment must give fully
satisfactory performance. Once it is established that supply
voltage will be maintained within the utilization range under
all system conditions, check and calculate if an unbalanced
condition exists between phases. Calculate percent voltage
unbalance as follows.
Three Phase Models Only
AIR FLOW ADJUSTMENTS
When the final adjustments are complete, the current
draw of the motor should be checked and compared to
the full load current rating of the motor. The amperage
must not exceed the service factor stamped on the motor
nameplate. The total airflow must not be less than that
required for operation of the furnace.
If an economizer is installed, check the unit operating
balance with the economizer at full outside air and at
minimum outside air.
NOTE: Never run high stage CFM below 300
CFM per ton evaporator freezing or poor unit
performance is possible.
BELT DRIVE MODELS ONLY
The drive on the supply fan is typically set in the middle
of the RPM range. The drive motor sheave pitch diameter
is field adjustable for the required airflow. Refer to “Motor
Sheave Adjustments” section.
Upon completion of the air flow balancing, we recommend
replacing the variable pitched motor sheave with a
properly-sized fixed sheave. A matching fixed sheave
will provide longer belt and bearing life and vibration free
operation. Initially, it is best to have a variable pitched
motor sheave for the purpose of airflow balancing, but once
the balance has been achieved, fixed sheaves maintain
alignment and minimize vibration more effectively. For
direct drive units, move fan speed wire.
Bearing Check
Prior to energizing any fans, check and make sure that all
setscrews are tight so that bearings are properly secured
to shafts.
Tension and Alignment Adjustment
Correct belt tension is very important to the life of your belt.
Too loose a belt will shorten its life; too tight, premature
Summary of Contents for AHRI 210
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