Daikin DSG SERIES, Руководство по установке, Страница: 15 / 60

15
• All electric power, all gas, hot water or steam line con-
nections, and the condensate drain installation have
been made to each unit on the job. These main sup-
ply 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
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.
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 ro-
tate 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.
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
properly 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 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 cir-
cuit 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 equip-
ment at which the equipment must give fully satisfactory perfor-
mance. 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
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
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 ex-
ceed the service factor stamped on the motor nameplate.
The total airflow must not be less than that required for op -
eration of the electric heaters or the furnace.
If an economizer is installed, check the unit operating bal-
ance with the economizer at full outside air and at minimum
outside air.
NOTE: Never run CFM below 300 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
indoor 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 m
OtOr
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. Re-
fer 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 for basic unit fan RPM.
Refer also to “Airflow” section of this manual. With discon -
nect switch open, disconnect thermostat wires from termi-
nals Y and W. This will prevent heating and mechanical cool-
ing 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 (see Appendix A - Blower Performance).