17
The 50XCW unit has a drain connection for evaporator
condensate. When connecting condensate drains from the unit
to floor drains, sinks, or hoppers, connect drains downstream of
trap to ensure that condensate does not drain back into the unit.
Make connections through the unit side panel. Some appli-
cations may require connection to either galvanized steel or
copper drain pipe; consult local code requirements for details.
Pitch drain pipe downward at a slope of at least
1
/
4
in. per ft
for proper drainage. Provide tees plugged on one side for clean
outs. Leave clearance for servicing, and observe all local sani-
tary codes.
The condensate trap should have a depth adequate to allow
3 in. of water in the trap (see Fig. 17) with the unit running.
Step 8 — Complete Electrical Connections
GENERAL — Verify that nameplate electrical requirements
match available power supply. Voltage at condenser must be
within the minimum and maximum shown in Tables 2 and 3
and phases must be balanced within 2%. Contact local power
company for line voltage corrections. Never operate a motor
where a phase imbalance in supply voltage is greater than 2%.
UNBALANCED 3-PHASE SUPPLY VOLTAGE — Use
the following formula to determine the percentage of voltage
imbalance.
Percent Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Fig. 16 — Typical Fan Discharge Connections for Multiple Fan Units
NOTE: A = min. straight duct length
a50-8357
a40-709tf
a40-707tf
a40-708tf
A
IMPORTANT: NEVER use pipe smaller than
3
/
4
inch
in the drain run.
TO UNIT
DRAIN
PLUG
MINIMUM PITCH
1/4 IN. PER
FT OF LINE
OPEN
VENT
S
EE
NOTE
Fig. 17 — External Trap Condensate Drain
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. trap is recommended.
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
718