System information

7
Corner weights Small cabinet Large cabinet
50JZ 024 030 036 048
Total weight 136 145 149 161
Corner weight 1 28.5 28.5 29 34.5
Corner weight 2 28 33.5 35 23
Corner weight 3 26 25 26 43.5
Corner weight 4 53.5 58 59 60
Converting horizontal discharge units to downflow
(vertical) discharge units
WARNING: Before performing service or maintenance
operations on system, turn off main power to unit. Turn off
accessory heater power switch if applicable. Electrical shock
could cause serious injury or death.
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal duct covers to access bottom return
and supply knock out panels.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
4. Reinstall the horizontal duct covers (Fig. 10) to block off
the horizontal air openings.
NOTE: Avoid abrupt duct size increases and reductions.
Abrupt change in duct size adversely affects air performance.
Provide for condensate disposal
NOTE: Ensure that condensate water disposal methods
comply with local codes, restrictions, and practices.
The 50JZ units dispose of condensate through a 3/4 in. NPT
female fitting that exits on the compressor end of the unit.
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 25 mm lower
than the drain condensate connection to prevent the drain from
overflowing. Prime the trap with water. 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 field-supplied 50 mm trap at the
condensate connection to ensure proper drainage. Condensate
trap is available as an accessory or is field-supplied. Make sure
that the outlet of the trap is at least 25 mm lower than the unit
drain condensate connection to prevent the drain from
overflowing. Connect a drain trough using a minimum of field-
supplied 3/4-in. PVC or copper pipe at outlet end of the 50 mm
trap (Fig. 11). Do not undersize the tube. Pitch the drain trough
downward at a slope of at least 25 mm every 3 m of horizontal
run. Be sure to check the drain trough for leaks. Prime the trap
at the beginning of the cooling season start-up.
Install electrical connections
WARNING: The unit cabinet must have an uninterrupted,
unbroken electrical ground to minimise the possibility of
personal injury if an electrical fault should occur. This
ground may consist of an electrical wire connected to the unit
ground lug in the control compartment, or conduit approved
for electrical ground when installed in accordance with local
electrical codes. Failure to adhere to this warning could
result in serious injury or death.
CAUTION: Failure to follow these precautions could result
in damage to the unit being installed:
1. Make all electrical connections in accordance with local
electrical codes governing such wiring.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINIUM 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%. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Insulate low-voltage wires for highest voltage contained
within conduit when low-voltage control wires are in
same conduit as high-voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware,
conduit, etc.
High-voltage connections
The unit must have a separate electrical supply with a field-
supplied, waterproof disconnect switch mounted at, or within
sight from the unit. Refer to the unit rating plate and local
codes for maximum fuse/circuit breaker size and minimum
circuit current for wire sizing. See Table 3 for electrical data.
The field-supplied disconnect may be mounted on the unit over
the high-voltage inlet hole (Figs. 1 and 2).
If the unit has an electric heater, a second disconnect may be
required. Consult the Installation, Start-Up, and Service
Instructions provided with the accessory for electrical supply
connections. Operation of unit on improper line voltage
constitutes abuse and may cause unit damage that could affect
warranty.
12
43
x
y
Fig. 3 - Corner weights, kg