Daikin DCG Series, Installation And Maintenance Manual

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13
STARTUP, ADJUSTMENTS, AND CHECKS
HIGH VOLTAGE!
T
O 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
ACCEPTABLE MEANS
. D
ISCONNECT ALL POWER BEFORE
SERVICING OR INSTALLING THIS UNIT
.
WARNING
P
RE
-S
TARTUP
I
NSTRUCTIONS
- G
ENERAL
T
O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY
, D
O NOT START
THE UNIT UNTIL ALL NECESSARY PRE
-
CHECKS AND TEST HAVE BEEN
PERFORMED
.
CAUTION
Prior to the beginning of Startup, Adjustments, and Checks proce-
dures, the following steps should be completed in the building.
MOVING MACHINERY HAZARD!
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH
,
DISCONNECT
POWER TO THE UNIT AND PADLOCK IN THE
“OFF”
POSITION BEFORE
SERVICING FANS
.
WARNING
This unit is equipped with an electronic ignition device to auto-
matically light the main burners. It also has a power vent blower
to exhaust combustion products.
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 pro-
cedure at outside ambients below 55°F should be limited to a readi-
ness check of the refrigeration system with the required final check
and calibration left to be completed when the outside ambient
rises above 55°F.
T
EMPORARY
H
EATING
O
R
C
OOLING
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. Failure to comply with this requirement will void
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.
C
ONTRACTOR
R
ESPONSIBILITY
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 combution air.
• Air filters are in place.
• Input rate and temperature rise are adjusted per rating
plate.
R
OOF
C
URB
I
NSTALLATION
C
HECK
Inspect the roof curb for correct installation. The unit and curb
assembly should be level. Inspect the flashing of the roof mount-
ing curb to the roof, especially at the corners, for good workman-
ship. Also check for leaks around gaskets. Note any deficiencies in
a separate report and forward to the contractor.
O
BSTRUCTIONS
, F
AN
C
LEARANCE AND
W
IRING
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 con-
nections.
F
IELD
D
UCT
C
ONNECTIONS
Verify that all duct connections are tight and that there is no air
bypass between supply and return.
F
ILTER
S
ECTION
C
HECK
Remove filter section access panels and check that filters are prop-
erly installed. Note airflow arrows on filter frames.
P
RE
-
STARTUP
P
RECAUTIONS
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 discon-
nect 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 C 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 equip-
ment 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.