Carrier 50ZHK, Installation Instructions Manual, Page: 7 / 22

50ZHK: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
X = Not Approved Combination
Configuring Units for Downflow (Vertical)
Discharge
Units are dedicated side supply products. They are not convertible to
vertical air supply. A field-supplied plenum must be used to convert to
vertical air discharge.
Step 6 – Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to comply
with local codes and restrictions.
Unit removes condensate through a 1-3/64 in. (27 mm) ID hole (using
3/4-in. (19 mm) ID piping or tubing) which is located at the end of the
unit. See Fig. 5 - Fig. 6 for location of condensate connection.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground level
installations. Install a field-supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that the
outlet of the trap is at least 1 in. (25 mm) lower than the drain pan
condensate connection to prevent the pan from overflowing (See Fig. 8
and Fig. 9 ). When using a gravel apron, make sure it slopes away from
the unit.
If the installation requires draining the condensate water away from the
unit, install a 2-in. (51 mm) trap using a 3/4-in. (19 mm) ID tubing or
pipe. (See Fig. 8 and Fig. 9 .) Make sure that the outlet of the trap is at
least 1 in. (25 mm) lower than the unit drain-pan condensate connection
to prevent the pan from overflowing. Prime the trap with water. Connect
a drain tube using a minimum of 3/4-in. (19 mm) PVC, 3/4-in. (19 mm)
CPVC, or 3/4-in. copper pipe (all field supplied). Do not undersize the
tube. Pitch the drain tube downward at a slope of at least 1 in. (25 mm)
for every 10 ft (3 m) of horizontal run. Be sure to check the drain tube
for leaks. Prime trap at the beginning of the cooling season start-up.
Allowable glues for condensate trap connection are: Standard ABS,
CPVC, or PVC cement.
A08001
Fig. 8 – Condensate Trap
A08002
Fig. 9 – PVC Condensate Trap
Step 7 – Install Electrical Connections
High-Voltage Connections
The unit must have a separate electrical service with a field-supplied,
waterproof disconnect switch mounted at, or within sight from the unit.
Refer to the unit rating plate, NEC and local codes for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for wire
sizing.
The field-supplied disconnect may be mounted on the unit over the
high-voltage inlet hole when the standard power and low-voltage entry
points are used. See Fig. 10 and Fig. 11 for acceptable location.
Operation of unit on improper line voltage constitutes abuse and may
cause unit damage that could affect warranty.
Table 2 – Minimum Airflow for Safe Electric Heater Operation
HP Unit
Size
Minimum Airflow (CFM)
5 kW 7.5 kW 10 kW 15 kW 20 kW
24 750 800 800 X X
30 750 800 800 X X
36 750 800 800 1200 X
42 750 800 800 1200 X
48 750 800 800 1200 1800
60 750 800 800 1200 1800
1” (25 mm) MIN.
2” (51 mm) MIN.
TRAP
OUTLET
TRAP
OUTLET
2" (51 mm) MIN.
1" (25 mm) MIN.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
The unit cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an electrical
fault should occur. This ground may consist of an electrical wire
connected to the unit ground screw in the control compartment, or
conduit approved for electrical ground when installed in accordance
with NEC, ANSI/NFPA 70 American National Standards Institute/
National Fire Protection Association (latest edition) (in Canada,
Canadian Electrical Code CSA C22.1) and local electrical codes.
CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit being
installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA 70 (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connections
must be in accordance with CSA standard C22.1 Canadian
Electrical Code Part 1 and applicable local codes. Refer to unit
wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO NOT
USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate. On 3-phase units,
ensure phases are balanced within 2 percent. Consult local
power company for correction of improper voltage and/or phase
imbalance.
4. Do not damage internal components when drilling through any
panel to mount electrical hardware, conduit, etc.
5. Route field power supply(s) away from areas that could be
damaged by lawn and garden equipment or other accidental
damage.