for maximum fuse/circuit breaker size and minimum circuit amps
(ampacity) 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 (See Figs. 2 and 3).
If the unit has an electric heater, a second disconnect may be
required. Consult the Installation, Start-Up, and Service Instruc-
tions provided with the accessory for electrical service connec-
tions.
Operation of unit on improper line voltage constitutes abuse and
may cause unit damage that could affect warranty.
ROUTING POWER LEADS INTO UNIT
Use only copper wire between disconnect and unit. The high-
voltage leads should be in a conduit until they enter the duct panel;
conduit termination at the duct panel must be watertight. Run the
high-voltage leads through the power entry knockout on the power
entry side panel. (See Fig. 2 and 3 for location and size) When the
leads are inside the unit, run leads up the high-voltage raceway to
the line wiring splice box (See Fig. 13 through 17). For single-
phase units, connect leads to the black and yellow wires; for
3-phase units, connect the leads to the black, yellow, and blue
wires.
CONNECTING GROUND LEAD TO GROUND LUG
Refer to Fig. 16 and 17. Connect the ground lead to the chassis
using the ground lug in the wiring splice box.
ROUTING CONTROL POWER WIRES (24-V)
Form a drip-loop with the thermostat leads before routing them
into the unit. Route the thermostat leads through grommeted,
low-voltage hole provided in unit into unit control power splice
box. (See Fig. 2 and 3) Connect thermostat leads to unit control
power leads as shown in Fig. 16.
The unit transformer supplies 24-v power for complete system
including accessory electrical heater. An automatic-reset circuit
breaker (See Fig. 18) is provided in the 24-v circuit; see the caution
label on the transformer or Fig. 19. Transformer is factory wired
for 230-v operation. If supply voltage is 208-v, rewire transformer
primary as described in Special Procedures for 208-v Operation
section.
EASY SELECT™—50XZ
EASY SELECT™ CONFIGURATION TAPS FOR 50XZ
Easy Select™ taps are used by the installer to configure a system.
The ECM motor uses the selected taps to modify its operation to
Table 1—Physical Data—Unit 50XZ
UNIT SIZE 50XZ024 50XZ030 50XZ036 50XZ042 50XZ048 50XZ060
NOMINAL CAPACITY (ton) 2
Not Yet
Available
3
Not Yet
Available
45
OPERATING WEIGHT (lb.) 350 “ 373 “ 463 499
COMPRESSOR QUANTITY 1
TYPE SCROLL COMPRESSOR
REFRIGERANT R-410A
REFRIGERANT METERING DEVICE
Indoor-TXV
Outdoor-Accurater
Refrigerant (R-410A) Quantity (lb.) 7.5 “ 9.5 “ 12.5 14.0
METERING DEVICE
ID
TXV “ TXV “ TXV TXV
ORIFICE OD (in.) 0.035 (2) “ 0.038 (2) “
0.038 (Left OD Coil)
0.046 (Right OD Coil)
0.042 (Left OD Coil)
0.052 (Right OD Coil)
OUTDOOR COIL
Rows... Fins/in.
face area (sq. ft.)
2...21
12.3
“
2...21
13.6
“
2...21
17.2
2...21
19.4
OUTDOOR FAN
Nominal Airflow (CFM)
Diameter
Motor HP (RPM)
2350
22
1/8 (825)
“
2800
22
1/8 (825)
“
3300
22
1/4 (1100)
3300
22
1/4 (1100)
INDOOR COIL
Rows... Fins/in.
face area (sq. ft.)
3...15
3.7
“
4...15
3.7
“
4...15
4.7
4...15
5.7
INDOOR BLOWER
Nominal Airflow (CFM)
Size (in.)
Motor (HP)
790
10x10
1/2
“
1100
11x10
3/4
“
1400
11x10
3/4
1750
11x10
1.0
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
610±15
420±25
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto)
20±5
45±10
RETURN-AIR FILTERS (in.)*
throwaway
20x20x1 “ 20x24x1 “ 24x30x1 24x30x1
* Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft/minute for throwaway type or 450 ft/minute for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
Table 2—Minimum Airflow for Reliable Electric Heater Operation (Cfm)
SIZE 50XZ024 50XZ030 50XZ036 50XZ042 50XZ048 50XZ060
AIRFLOW (CFM) 750 1025 1250 1285 1710 1800
9
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