Daikin DTC Series, Installation Instructions Manual

Page: 9 / 36

9
Cleaning
Due to the fact that drain pans in any air conditioning unit will
have some moisture in them, algae and fungus will grow due to
airborne bacteria and spores. Periodic cleaning is necessary
to prevent this build-up from plugging the drain.
STARTUP, ADJUSTMENTS, AND CHECKS
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to
electrical shock, bond the frame of this unit
to the building electrical ground by use of the
grounding terminal provided or other ac -
ceptable means. Disconnect all power before
servicing or installing this unit.
Pre-Startup Instructions
CAUTION
To prevent property damage or personal injury, do not
start the unit until all necessary pre-checks and tests
have been performed.
Prior to the beginning of Startup, Adjustments, and Checks
procedures, the following steps should be completed in
the building.
WARNING
MOVING MACHINERY HAZARD!
To prevent possible personal injury or death,
disconnect power to the unit and padlock in the “OFF”
position before servicing fans.
Heating Startup
On new installations, or if a major component has been
replaced, the operation of the unit must be checked.
Check unit operation as outlined in the following instructions.
If any sparking, odors, or unusual sounds are encountered,
shut off electrical power and recheck for wiring errors, or
obstructions in or near the blower motors. Duct covers must
be removed before operating unit.
The Startup, Adjustments, and Checks procedure provides
a step-by-step sequence which, if followed, will assure the
proper startup of the equipment in the minimum amount of
time. Air balancing of duct system is not considered part of
this procedure. However, it is an important phase of any
air conditioning system startup and should be performed
upon completion of the Startup, Adjustments, and Checks
procedure. The Startup, Adjustments, and Checks procedure
at outside ambients below 55°F should be limited to a
readiness check of the refrigeration system with the required
final check and calibration left to be completed when the
outside ambient rises above 55°F.
Temporary Heating Or Cooling
If the unit is to be used for temporary heating or cooling, a
“Startup, Adjustments, and Checks” must first be performed in
accordance with this manual. Damage or repairs due to failure
to comply with these requirements are not covered under the
warranty. After the machines are used for temporary heating
or cooling, inspect the coils, fans, and motors for unacceptable
levels of construction dust and dirt and install new filters.
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.
• All filters are in place.
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. Retighten 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