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 base pan.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
4. Reinstall 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.
Step 6—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
Table 1—Physical Data—Unit 50JZ
UNIT SIZE 024 030 036 042 048 060
NOMINAL CAPACITY (ton) 2 2 1/2 3 3-1/2 4 5
OPERATING WEIGHT (lb) 299 320 328 350 355 428
COMPRESSOR QUANTITY 11 1 1 1 1
TYPE SCROLL COMPRESSOR
REFRIGERANT R-410A
REFRIGERANT METERING DEVICE AccuRater®
Refrigerant (R-410A) Quantity (lb.) 7.0 8.9 9.3 9.5 10.6 12.4
ORIFICE ID (in.) 0.061 0.061 0.067 0.073 0.076 0.088
ORIFICE OD (in.) 2@0.032 2@0.040 2@0.040 2@0.038 2@0.046 2@0.052
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
8.5
2...17
10.3
2...17
10.3
2...17
13.5
2...17
13.5
2...17
15.4
OUTDOOR FAN
Nominal Airflow (CFM)
Diameter
Motor HP (RPM)
2350
22
1/8 (825)
2350
22
1/8 (825)
2800
22
1/4 (1100)
2500
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
3...15
3.7
4...15
3.7
3..15
4.7
4...15
4.7
4...15
5.7
INDOOR BLOWER
Nominal Airflow (CFM)
Size (in.)
Motor (HP)
800
10x10
1/4
1000
10x10
1/4
1200
10x10
1/2
1400
11x10
1/2
1600
11x10
1/2
1750
11x10
1
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 20x20x1 20x24x1 24x30x1 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 50JZ (Cfm)
SIZE 024 030 036 042 048 060
AIRFLOW (CFM) 800 1000* 1200 1400 1600 2000
* The 030 size models must be run on medium or high speed when used in
conjunction with 15 Kw electric heat accessory.
Fig. 9—Typical Installation
C00063
INDOOR
THERMOSTAT
DISCONNECT
PER NEC*
FROM
POWER
SOURCE
RETURN
AIR
TOP COVER
*NEC - NATIONAL ELECTRICAL CODE
Fig. 10—50JZ with Duct Covers On
C00092
Duct Covers
7
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