Daikin DAX1204 Series Руководство по установке - Страница 6
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Building Electrical Service Inspection
This unit is designed for 3-phase operation. DO NOT
OPERATE ON A SINGLE PHASE POWER SUPPLY. SEE
THE PRECEDING WARNING. Measure the power supply
to the unit. The supply voltage must be in agreement with
the unit nameplate power requirements and within the
range shown below:
Nominal
Supply Voltage
208 - 230
460
Voltage Balance: The supply voltage shall be unbalance
(phase to phase) within 2%. To calculate the percentage of
voltage unbalance use the following formula:
Percentage
Max Voltage Deviation From Average
Voltage Unbalance = 100 x
Example:
Avg. Voltage:
Max. Deviation from Avg. = 220 – 216 = 4
% Voltage Unbalance
Determine Wire Size: The selection of the appropriate
supply wire size is important to the operation of the
equipment. When selecting the wire size the following are
important elements of the decision:
• The wire size is adequately sized to carry the
Minimum Circuit Ampacity (MCA). Refer to the NEC
(USA) or CSA (Canada) for wire sizing. The unit MCA
for the airhandler and the optional electric heat kit
can be found on the equipment S&R plate and the
following table.
AIRHANDLER
VOLTAGE
208 - 230
DAX0904 and
DAX1204
460
Wire Sizing
Wire size is important to the operation of your equipment.
Use the following check list when selecting the appropriate
wire size for your unit.
• Wire size must carry the Minimum Circuit
Ampacity (MCA).
Minimum
Maximum
Supply Voltage
197
253
414
506
Average Voltage
L1 – L2 = 220 V
L2 – L3 = 216 V
L1 – L3 = 213 V
=
(220+216+213) / 3
=
649 / 3
=
216
= 100 x (4 / 216)
= 400 / 216
= 1.8%
HEAT KIT
None
15.5 / 15.5
AHKD15-3A
56.3 / 62.4
AHKD20-3A
69.4 / 77.4
AHKD30-3A
95.4 / 108
None
AHKD15-4A
AHKD20-4A
AHKD30-4A
• Refer to the NEC (USA) or CSA (Canada) for wire
sizing. The unit MCA for the air handler and the
optional electric heat kit can be found on the unit
Series and Rating Plate.
• Wire size allows for no more than a 2% voltage
drop from the building breaker/fuse panel to the
unit.
Refer to the latest edition of the National Electric
Code or in Canada the Canadian Electric Code when
determining the correct wire size. The following table
shows the current carrying capabilities for copper
conductors rated at 75°C with a 2% voltage drop.
Use this table determine the voltage drop per foot of
various conductors.
MAXIMUM ALLOWABLE LENGTH IN FEET TO LIMIT
Wire Size
(AWG)
14
12
10
8
6
Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC
(Canada) approved overcurrent protection device. Also,
check with local or state codes for any special regional
requirements.
Protection can be in the form of fusing or HACR style
circuit breakers. The Series and Rating Plate can be used
as a guide for selecting the MAXIMUM overcurrent device
or reference the following table.
NOTE: Fuses or circuit breakers are to be sized
larger than the equipment MCA but not to exceed
the MOP.
AIRHANDLER
MCA
DAX0904 and
DAX1204
5.2
28.3
35.8
50.9
6
VOLTAGE DROP TO 2%
Minimum Circuit Ampacity (MCA)
10
15
20
25
77
51
38
NR
122
81
61
49
193 129
97
77
307 205 154 123 103
489 326 244 195 163 140 122 109
VOLTAGE
HEAT KIT
None
AHKD15-3A
208 - 230
AHKD20-3A
AHKD30-3A
None
AHKD15-4A
460
AHKD20-4A
AHKD30-4A
30
35
40
45
NR
NR
NR
NR
NR
NR
NR
NR
64
55
NR
NR
88
77
68
MOP
20 / 20
60 / 70
70 / 80
100 / 110
15
30
40
60