Engineering Manual

21
Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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GENERAL DATA
Specications − Vertical Air Handler NK Chassis
1
Power Input is rated at high speed.
2
Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or
destroy R410A refrigerant according to applicable regulations (40 CFR Part 82, Subpart F)
under section 608 of CAA.
3
All communication cable to be minimum 18 AWG, 2-conductor, stranded, shielded and
must comply with applicable local and national codes. Ensure the communication cable
is properly grounded at the master outdoor unit only. Do not ground the ODU−IDU com-
munications cable at any other point.
EEV: Electronic Expansion Valve
Power wiring is field supplied and must comply with the applicable local and national
codes. Power Supply (V/Hz/Ø): 208-230/60/1
This unit comes with a dry nitrogen charge.
This data is rated 0 ft above sea level, with 25 ft of refrigerant line per indoor unit and a 0 ft
level difference between outdoor and indoor units. All capacities are net with a combina-
tion ratio between 95-105%.
Cooling capacity rating obtained with air entering the indoor coil at 80ºF dry bulb (DB) and
67ºF wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB).
Heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb (DB) and
outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
Table 9: Vertical Air Handler NK Chassis IDU Specications
Model No. ARNU423NKA4 ARNU483NKA4 ARNU543NKA4
Cooling Mode Performance
Capacity (Btu/h)
42,000 48,000 54,000
Power Input
1
(W)
260 330 366
Heating Mode Performance
Capacity (Btu/h)
46,000 54,000 60,000
Power Input
1
(W)
260 330 366
Entering Mixed Air
Cooling Max. (°F WB)
76 76 76
Heating Min. (°F DB)
59 59 59
Unit Data
Refrigerant Type
2
R410A R410A R410A
Refrigerant Control
EEV EEV EEV
Net Unit Weight (lbs.)
165 165 165
Shipping Weight (lbs.)
181 181 181
Communication Cable
4
(No. x AWG)
2 x 18 2 x 18 2 x 18
Fan
Type
Sirocco Sirocco Sirocco
Motor
1 1 1
Housing
1 1 1
Motor/Drive
Brushless Digitally Controlled / Direct
Airflow Rate H/M/L (CFM)
Standard Mode
1,250 / 1,100 / 1,000 1,400 / 1,260 / 1,000 1,475 / 1,400 / 1,260
Airflow Rate H/M/L (CFM)
High Mode (Factory Set)
1,250 / 1,100 / 1,000 1,400 / 1,260 / 1,000 1,475 / 1,400 / 1,260
External Static Pressure (in. wg)
Standard Mode
0.3 0.3 0.3
External Static Pressure (in. wg)
High Mode (Factory Set)
0.5 0.5 0.5
Piping
Liquid Line (in., O.D.)
3/8 Flare 3/8 Flare 3/8 Flare
Vapor Line (in., O.D.)
5/8 Flare 5/8 Flare 5/8 Flare
Condensate Line (in., I.D.)
1 1 1