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13
•
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.
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 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 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.
Utilization Voltage -
The voltage of the line terminals of the equip-
ment at which the equipment must give fully satisfactory perfor-
mance. Once it is established that supply voltage will be main-
tained 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
3) PERCENT VOLTAGE
UNBALANCE
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
HOW TO USE THE FORMULA:
EXAMPLE: With voltage of 220, 216, and 213
1) Average Voltage = 220+216+213=649 / 3 = 216
2) Maximum Voltage Deviations from Average Voltage = 220 - 216 = 4
3) Percent Voltage Unbalance = 100 x
=
= 1.8%
Percent voltage unbalance MUST NOT exceed 2%
.
4
216
400
216
= 100 X
AIR FLOW ADJUSTMENTS
NOTE:
For 2 speed models, airflow adjustments must be made on
high speed, i.e., 2nd stage cooling or in heat mode.
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 electric heaters
or 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 CFM below 350 CFM per ton, evaporator freezing
or poor unit performance is possible.
PSC M
OTOR
Adjust the CFM for the unit by changing the speed tap of the in-
door blower motor at the heat or cool tap on the control board
connection with the one of the speed taps on “M1” or “M2” (Black-
High Speed, Blue-Medium Speed, Red-Low Speed).
EEM Motor
Adjust the CFM for the unit by changing the position of the low
voltage leads on the motor terminal block. Green is for Fan Only.
Yellow is for Cooling and Heat Pump Heating. Refer to Appendix A
for blower performance at each speed tap.
NOTE:
If more than
one lead is energized simultaneously, the motor will run at the
higher speed.
S
ET
E
VAPORATOR
F
AN
R
PM
Actual RPM’s must be set and verified with a tachometer or strobe
light. Refer to Appendices A and B for basic unit fan RPM. Refer
also to “Airflow” section of this manual. With disconnect switch
open, disconnect thermostat wires from terminals Y and W. This
will prevent heating and mechanical cooling from coming on. Place
a jumper wire across terminals R and G at TB1 terminal block. Close
disconnect switch; evaporator fan motor will operate so RPM can
be checked.
For gas heat units, the airflow must be adjusted so that the air
temperature rise falls within the ranges given stated on Data Plate