11
P
RE
-S
TARTUP
I
NSTRUCTIONS
T
O
PREVENT
PROPERTY
DAMAGE
OR
PERSONAL
INJURY
, D
O
NOT
START
THE
UNIT
UNTIL
ALL
NECESSARY
PRE
-
CHECKS
AND
TESTS
HAVE
BEEN
PERFORMED
.
CAUTION
Prior to the beginning of Startup, Adjustments, and Checks
procedures, the following steps should be completed in the
building.
THERMOSTAT
. Set the thermostat in the conditioned
space at a point at least 10°F below zone temperature.
On cooling only models, set the thermostat system
switch on COOL and the fan switch on AUTO. On
heating/cooling models, set the thermostat system
switch on COOL and the fan switch on AUTO.
NIGHT SETBACK THERMOSTAT (OPTIONAL)
. Set
thermostat at a point at least 10°F below zone
temperature.
MOVING MACHINERY HAZARD!
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
,
DISCONNECT
POWER
TO
THE
UNIT
AND
PADLOCK
IN
THE
“OFF”
POSITION
BEFORE
SERVICNG
FANS
.
WARNING
H
EATING
S
TARTUP
On new installations, or if a major component has been re-
placed, 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 ob-
structions 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 proce-
dure. The Startup, Adjustments, and Checks procedure 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
OOLS
R
EQUIRED
Refrigeration gauge and manifold
Voltmeter
Clamp-on ammeter
Ohmmeter
Test lead
(Minimum #16 AWG with insulated alligator clips)
Air temperature measuring device
General refrigeration mechanics’ tools
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 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.
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
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 contrac-
tor.
O
BSTRUCTIONS
, F
AN
C
LEARANCE
AND
W
IRING
Remove any extraneous construction and shipping materi-
als 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.
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 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 Ap-
pendix C Electrical Data.
