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a50-8108
Fig. 16 — Air Distribution — Thru-the-Bottom
a50-8109
Fig. 17 — Air Distribution — Thru-the-Side
Fig. 18 — Outdoor Air and Return Air Sensors
Location
Step 5 — Trap Condensate Drain
See Fig. 6-14 for drain location. Condensate drain is open to atmo-
sphere and must be trapped. Install a trapped drain at the drain lo-
cation. One 1-in. female pipe coupling is provided inside the unit
evaporator section for condensate drain connection. A trap at least
4 in. deep must be used. See Fig. 19. Trap must be installed to pre-
vent freeze-up.
Condensate pans are sloped so that water will completely drain
from the condensate pan to comply with indoor air quality guide-
lines. The condensate drain pans are not insulated.
a48-3714
Fig. 19 — Condensate Drain Trap Piping Details
(Typical Roof Curb or Slab Mount Shown)
Step 6 — Make Electrical Connections
POWER WIRING
Units are factory wired for the voltage shown on unit nameplate.
Provide a unit safety disconnect switch in the main power supply
to each unit (Fig. 20). Select switch size and mounting location in
accordance with applicable local codes or National Electrical
Code (NEC). If combining the functions of safety disconnect with
maximum overcurrent protection (MOCP) fuses ("fused discon-
nect"), coordinate safety switch size with MOCP size data as
marked on unit informative plate.
Unit may be equipped with optional factory-installed non-fused
disconnect switch. See Fig. 20. Provide maximum overcurrent
protection devices (fuses or UL489 rated breakers, per local
codes) in branch circuit wiring remote from unit. Observe require-
ments of NEC Article 440. Install service switch upstream of re-
mote fuses if required.
The main power terminal block is suitable for use with aluminum
or copper wire. See Fig. 20. Units have circuit breakers for com-
pressors, fan motors, and control circuit. If required by local
codes, provide an additional disconnect switch. Unit must be elec-
trically grounded in accordance with local codes or, in absence of
local codes, with NEC, ANSI (American National Standards Insti-
tute) C1-latest year.
FIELD POWER SUPPLY
Unit is factory wired for voltage shown on unit nameplate. Field
wiring can be brought into the unit from bottom (through base-
pan and roof curb) or through side of unit (corner post next to
control box).
A 3
/
-in. NPT coupling for field power wiring and a
1
2
coupling for 24-v control wiring are provided in basepan. In the
side post, there are two 2
040-060) knockouts for the field power wiring. See Fig. 6-13. If
control wiring is to be brought in through side of unit, a
diameter hole is provided in the condenser side post next to the
control box.
Do not route control wiring in the same conduit as power wiring.
If disconnect box is mounted to corner post, be careful not to drill
or screw into the condenser coil.
Routing Through Bottom of Unit
If wiring is brought in through bottom of unit, use field-supplied
watertight conduit to route power wiring through the 3
ameter hole provided in the unit basepan.
Install conduit connector in unit basepan as shown in Fig. 6-13.
Route power and ground lines through connector to terminal con-
nections in unit control box as shown on unit wiring diagram and
Fig. 20.
22
/
3
/
-in. (sizes 020-035) or 3-in. (sizes
1
2
-in. NPT
4
/
-in.
7
8
/
-in. di-
1
2
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