Carrier 50JZ Guide Instruction manual

50JZ---A
Single Packaged Heat Pump System
with Puron (R---410A) Refrigerant
50 Hz, CE Nominal 7---14 kW (Sizes 24---48)
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner’s Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RECEIVING AND INSTALLATION . . . . . . . . . . . . . . . . . . 2--9
Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Provide Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rigging/Lifting of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Select and Install Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Provide for Condensate Disposal . . . . . . . . . . . . . . . . . . . . . . 8
Install Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . 10
High--Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 10
Control Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . 10
Standard Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Transformer Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Accessory Electric Heaters Installation . . . . . . . . . . . . . . . 11
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PRE--START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13--16
Checking Cooling & Heating Control Operation . . . . . . . . 13
Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . . . . . . . . . 13
Start--Up Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Checking & Adjusting Refrigerant Charge . . . . . . . . . . . . 14
Indoor Airflow & Airflow Adjustments . . . . . . . . . . . . . . 15
Defrost Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Quiet Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17--20
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Outdoor Coil, Indoor Coil, & Condensate Drain Pan . . . . . . 19
Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . . 19
Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Metering Devices-- Piston . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Loss of Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
High Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Copeland Scroll compressor (Puron Refrigerant) . . . . . . . . . 20
A09042
Fig. 1 -- Unit 50JZ--A
Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Systems on Roofs with Synthetic Materials . . . .
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . .
PuronR (R--410A) Refrigerant Charging . . . . . . . . . . . . .
System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loss of Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
20
20
20
20
20
20
20
21
21
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes, the
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the Canadian Electrical
Code CSA C22.1.
.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these
1
signal words: DANGER, WARNING, and CAUTION. These
words are used with the safety--alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
50JZ-- A
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. There may be
more than one disconnect switch. Turn off accessory heater
power switch if applicable.
CAUTION
!
roof curb. Improperly applied gasketing also can result in air leaks
and poor unit performance.
Curb should be level to within 1/4 in. (6 mm) (See Fig. 9). This is
necessary for unit drain to function properly. Refer to accessory
roof curb installation instructions for additional information as
required.
Installation on older “G” series roof curbs.
Two accessory kits are available to aid in installing a new “G”
series unit on an old “G” roof curb.
1. Accessory kit number CPADCURB001A00, (small chassis)
and accessory kit number CPADCURB002A00, (large
chassis) includes roof curb adapter and gaskets for the
perimeter seal and duct openings. No additional
modifications to the curb are required when using this kit.
2. An alternative to the adapter curb is to modify the existing
curb by removing the outer horizontal flange and use
accessory kit number CPGSKTKIT001A00 which includes
spacer blocks (for easy alignment to existing curb) and
gaskets for the perimeter seal and duct openings. This kit is
used when existing curb is modified by removing outer
horizontal flange.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
UNIT/STRUCTURAL DAMAGE HAZARD
When removing access panels (see Fig. 18) or performing
maintenance functions inside your unit, be aware of sharp
sheet metal parts and screws. Although special care is taken
to reduce sharp edges to a minimum, be extremely careful
when handling parts or reaching into the unit.
INTRODUCTION
The 50JZ--A heat pump is fully self--contained and designed for
outdoor installation. (See Fig. 1) Standard units are shipped in a
horizontal--discharge configuration for installation on a ground
level slab. Standard units can be converted to downflow (vertical)
discharge configurations for rooftop applications.
RECEIVING AND INSTALLATION
CAUTION
Failure to follow this caution may result in property
damage.
Ensure there is sufficient clearance for saw blade when
cutting the outer horizontal flange of the roof curb so there
is no damage to the roof or flashing.
Slab Mount
Place the unit on a solid, level concrete pad that is a minimum of 4
in. (102 mm) thick with 2 in. (51 mm) above grade (See Fig. 2).
The slab should extend approximately 2 in. (51 mm) beyond the
casing on all 4 sides of the unit. Do not secure the unit to the slab
except when required by local codes.
Step 1 — Check Equipment
OPTIONAL
RETURN
AIR
OPENING
Identify Unit
OPTIONAL
SUPPLY
AIR
OPENING
The unit model number and serial number are stamped on the unit
identification plate. Check this information against shipping
papers.
Inspect Shipment
Inspect for shipping damage before removing packaging material.
If unit appears to be damaged or is torn loose from its anchorage,
have it examined by transportation inspectors before removal.
Forward claim papers directly to transportation company.
Manufacturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the
nearest equipment distributor if any item is missing. To prevent
loss or damage, leave all parts in original packages until
installation.
If the unit is to be mounted on a curb in a downflow application,
review Step 5 to determine which method is to be used to remove
the downflow panels before rigging and lifting into place. The
panel removal process may require the unit to be on the ground.
Step 2 — Provide Unit Support
Roof Curb
Install accessory roof curb in accordance with instructions shipped
with curb (See Fig. 5). Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasketing material supplied with the
2˝
(50.8mm)
EVAP. COIL
COND. COIL
A07926
Fig. 2 -- Slab Mounting Detail
Step 3 — Provide Clearances
The required minimum service clearances are shown in Fig. 3 and
4. Adequate ventilation and outdoor air must be provided. The
outdoor fan draws air through the outdoor coil and discharges it
through the top fan grille. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a
corner or under an overhead obstruction. The minimum clearance
under a partial overhang (such as a normal house overhang) is 48
in. (1219 mm) above the unit top. The maximum horizontal
extension of a partial overhang must not exceed 48 in. (1219 mm).
IMPORTANT: Do not restrict outdoor airflow. An air restriction
at either the outdoor--air inlet or the fan discharge may be
detrimental to compressor life.
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting or other combustible materials. Slab--mounted units
2
50JZ-- A
should be at least 4 in. (102 mm) above the highest expected water
and runoff levels. Do not use unit if it has been under water.
A09502
Fig. 3 -- 50JZ--A24--36 Unit Dimensions
3
50JZ-- A
A09503
Fig. 4 -- 50JZ--A48 Unit Dimensions
4
Dashed lines show cross support
location for large basepan units.
B
G
HVAC unit
basepan
HVAC unit
base rails
C
Sealing
Gasket
Roofcurb
A
Anchor screw
H
F
Wood nailer*
Flashing field
supplied
Roofcurb*
Insulation
(field supplied)
E
D
Cant strip
field supplied
SMALL/COMMON CURB
50JZ-- A
Roofing material
field supplied
A09413
*Provided with roofcurb
A09090
ROOF CURB DETAIL
B
C
SUPPLY
AIR
SMALL
BASE
UNIT
RETURN
AIR
LARGE
BASE
UNIT
G
H
F A
E
D
UNIT PLACEMENT ON
COMMON CURB
SMALL OR LARGE BASE UNIT
A09415
LARGE CURB
A09094
A09414
UNIT
SIZE
CATALOG
NUMBER
Small
or
Large
CPRFCURB010A00
A
IN.
(mm)
11 (279)
CPRFCURB011A00
14 (356)
CPRFCURB012A00
CPRFCURB013A00
11 (279)
14 (356)
Large
B (small/common
base)
IN. (mm)*
B (large base)
IN. (mm)*
C
IN.
(mm)
D
IN.
(mm)
14 (356)
16 (406)
47.8
(1214)
10 (254)
14 (356)
E
IN.
(mm)
32.4
(822)
43.9
(1116)
F
IN.
(mm)
G
IN. (mm)
30.6 (778)
2.7 (69)
42.2
(1072)
H
IN. (mm)
46.1
(1170)
* Part Numbers CPRCURB010A00 and CPRCURB011A00 can be used on both small and large basepan units. The cross supports must be located based on
whether the unit is a small basepan or a large basepan.
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
3. Roof curb is made of 16 ---gauge steel.
4. Attach ductwork to curb (flanges of duct rest on curb).
5. Insulated panels: 1 ---in. (25 mm) thick fiberglass 1 lb. density.
Fig. 5 -- Roof Curb Dimensions
5
CAUTION - NOTICE TO RIGGERS
PRUDENCE - AVIS AUX MANIPULATEUR
ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.
PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.
Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition
DUCTS
50JZ-- A
MINIMUM HEIGHT: 36" (914.4 mm)
HAUTEUR MINIMUM
SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB
UNIT HEIGHT
HAUTEUR D'UNITÉ
SEE DETAIL A
VOIR DÉTAIL A
BANDE SCELLANT DOIT ÊTRE
EN PLACE AVANT DE PLACER
L'UNITÉ SUR LA BASE DE TOIT
DETAIL A
VOIR DÉTAIL A
50CY502286 2.0
A09051
RIGGING WEIGHTS (SMALL CABINET)
24
30
Unit
lb
kg
lb
kg
Rigging Weight
314
142.4
335
152.0
NOTE: See dimensional drawing for corner weight distribution.
36
lb
343
kg
155.6
RIGGING WEIGHTS (LARGE CABINET)
48
Unit
lb
kg
Rigging Weight
373
169.2
Fig. 6 -- Rigging Weights
1. Leave top shipping skid on the unit for use as a spreader bar
to prevent the rigging straps from damaging the unit. If the
Rigging and handling of this equipment can be hazardous for
skid is not available, use a spreader bar of sufficient length
many reasons due to the installation location (roofs, elevated
to protect the unit from damage.
structures, etc.).
Only trained, qualified crane operators and ground support staff
!
should handle and install this equipment.
When working with this equipment, observe precautions in the
PROPERTY DAMAGE HAZARD
literature, on tags, stickers, and labels attached to the equipment,
Failure to follow this warning could result in personal injury.
and any other safety precautions that might apply.
When straps are taut, the clevis should be a minimum of 36
Training for operators of the lifting equipment should include, but
in. (914 mm) above the unit top cover.
not be limited to, the following:
1. Application of the lifter to the load, and adjustment of the
Rigging/Lifting of Unit (See Fig. 6)
lifts to adapt to various sizes or kinds of loads.
Lifting holes are provided in base rails as shown.
2. Instruction in any special operation or precaution.
1. Attach shackles, clevis pins, and straps to the base rails of
3. Condition of the load as it relates to operation of the lifting
the unit. Be sure materials are rated to hold the weight of the
kit, such as balance, temperature, etc.
unit (See Fig. 6).
Follow all applicable safety codes. Wear safety shoes and work
2. Attach a clevis of sufficient strength in the middle of the
gloves.
straps. Adjust the clevis location to ensure unit is lifted level
with the ground.
Inspection
After the unit is placed on the roof curb or mounting pad, remove
Prior to initial use, and at monthly intervals, all rigging shackles,
the top skid.
clevis pins, and straps should be visually inspected for any damage,
evidence of wear, structural deformation, or cracks. Particular
Step 5 — Select and Install Ductwork
attention should be paid to excessive wear at hoist hooking points
The design and installation of the duct system must be in
and load support areas. Materials showing any kind of wear in
accordance with the standards of the NFPA for installation of
these areas must not be used and should be discarded.
non--residence type air conditioning and ventilating systems,
NFPA 90A or residence--type, NFPA 90B and/or local codes and
!
ordinances.
UNIT FALLING HAZARD
Select and size ductwork, supply--air registers, and return air grilles
according to ASHRAE (American Society of Heating,
Failure to follow this warning could result in personal
injury or death.
Refrigeration, and Air Conditioning Engineers) recommendations.
The unit has duct flanges on the supply-- and return--air openings
Never stand beneath rigged units or lift over people.
on the side of the unit.
Step 4 — Rig and Place Unit
WARNING
WARNING
6
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury or death.
For vertical supply and return units, tools or parts could
drop into ductwork Install a 90 degree turn in the return
ductwork between the unit and the conditioned space. If a
90 degree elbow cannot be installed, then a grille of
sufficient strength and density should be installed to prevent
objects from falling into the conditioned space. Units with
electric heaters require 90 degree elbow in supply duct.
When designing and installing ductwork, consider the following:
1. All units should have field--supplied filters or accessory
filter rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
2. Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weather tight and airtight seal. When electric heat is
installed, use fireproof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must extend 24--in.
(610 mm) from electric heater element.
3. Size ductwork for cooling air quantity (cfm). The minimum
air quantity for proper electric heater operation is listed in
Table 2. Heater limit switches may trip at air quantities
below those recommended.
4. Seal, insulate, and weatherproof all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential
heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof,
and vibration--isolate duct openings in wall or roof
according to good construction practices.
shipped on unit from factory. Insure openings are air and
watertight.
NOTE: The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence--type air conditioning and ventilating systems, NFPA
90A or residence--type, NFPA 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for side shot installation.
2. Select and size ductwork, supply--air registers, and
return--air grilles according to American Society of Heating,
Refrigeration and Air Conditioning Engineers (ASHRAE)
recommendations.
3. Use flexible transition between rigid ductwork and unit to
prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weather--tight and airtight seal.
4. All units must have field--supplied filters or accessory filter
rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
5. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases or performance may be
affected.
Horizontal Duct Covers
A09076
CONFIGURING UNITS FOR DOWNFLOW
(VERTICAL) DISCHARGE
!
WARNING
Basepan
Downflow
(Vertical)
Supply
Knockout
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Basepan
Downflow
(Vertical)
Return
Knockout
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Remove horizontal (metal) ductcovers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Fig. 7.)
3. To remove downflow return and supply knockout covers,
break front and right side connecting tabs with a
screwdriver and hammer. Push cover down to break rear
and left side tabs.
NOTE: These panels are held in place with tabs similar to an
electrical knockout. Reinstall horizontal duct covers (Fig. 7)
A09093
Fig. 7 -- Supply and Return Duct Opening
6. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned
space, and use vapor barrier in accordance with latest issue
of Sheet Metal and Air Conditioning Contractors National
Association (SMACNA) and Air Conditioning Contractors
of America (ACCA) minimum installation standards for
heating and air conditioning systems. Secure all ducts to
building structure.
7
50JZ-- A
!
7. Flash, weatherproof, and vibration--isolate all openings in
building structure in accordance with local codes and good
building practices.
50JZ-- A
Step 6 — Provide for Condensate Disposal
TRAP
OUTLET
1-in. (25 mm) min.
NOTE: Ensure that condensate--water disposal methods comply
with local codes, restrictions, and practices.
The 50JZ--A 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 1 in. (25 mm) lower than the
drain--pan condensate connection to prevent the pan 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 2 --in. (51mm) 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 1 in. (25 mm) lower than the unit
drain--pan condensate connection to prevent the pan from
overflowing. Connect a drain tube using a minimum of
field--supplied 3/4--in. PVC or field--supplied 3/4--in. copper pipe
at outlet end of the 2--in. (51 mm) trap. (See Fig. 8.) Do not
undersize the tube. Pitch the drain tube downward at a slope of at
least 1 in. (25 mm) every 10 ft (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.
2-in. (51 mm) min.
A09052
Fig. 8 -- Condensate Trap
A
C
MAXIMUM ALLOWABLE
DIFFERENCE in. (mm)
B
A-B
B-C
A-C
1/4 (6.35)
1/4 (6.35)
1/4 (6.35)
A07925
Fig. 9 -- Unit Leveling Tolerances
8
Table 1 – Physical Data -- Unit 50JZ--A
50JZ--- A24
2
7
314
142.4
6.9
3.2
0.059
1.55
0.032 (2)
.81
50JZ--- A30
2.5
8.8
335
152.0
50JZ--- A36
3
10.6
343
155.6
1
SCROLL COMPRESSOR
R---410A
Accurater
9.6
10.0
4.0
4.2
0.061
0.067
1.55
1.70
0.040 (2)
0.040 (2)
1.02
1.02
50JZ--- A48
4
14.1
373
169.2
12.0
4.8
0.078
1.93
0.046 (2)
1.17
2...17
2...6.7
8.5
.79
2...17
2...6.7
10.3
.96
2...17
2...6.7
10.3
.96
2...17
2...6.7
13.5
1.25
2200
1038
22
559
1/4 (900)
187
.187...15
2200
1038
22
559
1/4 (900)
187
.187...15
2200
1038
22
559
1/4 (900)
187
.187...15
2400
1133
22
559
1/3 (1340)
249
.249...22
3...15
3...5.9
3.7
.34
3...15
3...5.9
3.7
.34
4...15
4...5.9
3.7
.34
4...15
4...5.9
4.7
.44
800
378
10x10
25.4x25.4
1/4
187
1000
472
10x10
25.4x25.4
1/2
373
1200
566
10x10
25.4x25.4
1/2
373
1600
708
11x10
27.9x25.4
1.0
746
650±15
420±25
20±5
45±10
LOSS--- OF--- CHARGE/LOW --- PRESSURE SWITCH
(Liquid Line) (psig) Cutout Reset (Auto)
Cutout (kPA)
Reset (Auto) (kPa)
20±5
45±10
RETURN--- AIR FILTERS*{
20x20x1
20x20x1
24x24x1
24x30x1
throwaway (in.)
508x508x25
508x508x25
610x610x25
610x762x25
(mm)
*Required filter sizes shown are based on the larger of the AHRI (Air Conditioning, Heating 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.
W.C.
{ If using accessory filter rack refer to the filter rack installation instructions for correct filter size and quantity.
9
50JZ-- A
UNIT SIZE
NOMINAL CAPACITY (ton)
(kW)
OPERATING WEIGHT (lb)
(kg)
COMPRESSOR QUANTITY
TYPE
REFRIGERANT
METERING DEVICE ID
Refrigerant (R --- 410A) Quantity (lb)
Quantity (kg)
ORIFICE ID (in.)
(mm)
ORIFICE OD (in.)
(mm)
OUTDOOR COIL
Rows... Fins/in.
Rows... Fins (cm)
face area (sq. ft.)
face area (sq. m)
OUTDOOR FAN
Nominal Airflow (CFM)
Nominal Airflow (L/s)
Diameter (in)
Diameter (mm)
Motor HP (RPM)
Motor kW
Motor (r/s)
INDOOR COIL
Rows... Fins/in.
Rows... Fins (cm)
face area (sq. ft.)
face area (sq. m)
INDOOR BLOWER
Nominal Cooling Airflow (CFM)
Nominal Cooling Airflow (L/s)
Size (in.)
Size (cm)
Motor (HP)
Motor (kW)
HIGH --- PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
Cutout (kPA)
Reset (Auto) (kPa)
Step 7 — Install Electrical Connections
!
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
CAUTION
POWER
SUPPLY
50JZ-- A
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
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.
!
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. 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,NFPA 70 National Fire
Protection Association (latest edition) (in Canada, Canadian
Electrical Code CSA C22.1) and local electrical codes.
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. 3 and 4 for acceptable
location. Remove high voltage knockout.
See unit wiring label (Fig. 12) and Fig. 10 for reference when
making high voltage connections. Proceed as follows to complete
the high--voltage connections to the unit.
1. Run the high--voltage (L1, L2, L3) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black, yellow and blue wires connected to the
line side of the terminal block.
4. Connect field L1 to black wire.
5. Connect field wire L2 to yellow wire.
6. Connect field wire L3 to blue wire.
EQUIP GR
FIELD-SUPPLIED
FUSED DISCONNECT
CONTROL BOX
LOW-VOLTAGE
TERMINAL BOARD
(SEE UNIT)
WIRING LABEL
W1
W1
W2
W2
Y1
Y
G
G
R
R
C
C
Y2
O
THERMOSTAT
(TYPICAL)
SPLICE BOX
A09378
Fig. 10 -- High-- and Control--Voltage Connections
Control Voltage Connections
NOTE: Do not use any type of power--stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color--coded, insulated
(35°C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color--coded, insulated
(35° C minimum) wires.
Standard Connections
Locate the low voltage terminal board in 24 volt splice box. See
Fig. 10 for connection diagram. Run the low--voltage leads from
the thermostat, through the control wiring inlet hole grommet (Fig.
3 and 4), and into the low--voltage splice box. Provide a drip loop
before running wires through panel. Secure and strain relief all
wires so that they do not interfere with operation of unit.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to low voltage terminal board W1 and C
terminals.
Transformer Protection
The transformer is protected by a 24 volt circuit breaker. If an
overload or short is present, correct overload condition and reset 24
volt circuit breaker.
Special Procedures for 420-- v Operation
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag.
The transformer in the unit has two taps, 380 and 415 volts. For
power supplies above 400 volts, the transformer must be connected
to the 415 volt tap. With power off, disconnect blue wire from
transformer splice connection and connect black wire from
transformer to splice connection. Insulate unused blue transformer
tap. See transformer label. During unit start--up, check secondary
voltage to ensure that a minimum of 20 volts is available during
unit operation, and that voltage does not exceed 29 volts while unit
is off.
10
d. HEAT PUMP HEATING MODE
(1.) Thermostat closes circuits R to G and R to Y1. The
compressor, indoor and outdoor fans are energized.
e. HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
(1.) Thermostat closes circuits R to G, R to Y1 and R
to W/W1 or W2. The compressor, indoor and
outdoor fans are energized, as well as the electric
heat relays.
f. DEFROST MODE
The defrost mode is automatically energized by the
defrost board during heating mode. The defrost board
energizes “O” (reversing valve) and “W2” (electric
heat). It also de--energizes the outdoor fan. When defrost
is complete, unit will return to heating mode. If room
thermostat is satisfied during defrost, unit will shut
down and restart in defrost on next call for heat.
Electric heaters may be installed with the 50JZ--A units per
instructions supplied with electric heater package. See unit rating
plate for factory--approved electric heater kits.
Sequence of Operation
a. CONTINUOUS FAN
(1.) Thermostat closes circuit R to G energizing the
blower motor for continuous fan.
b. COOLING MODE
(1.) If indoor temperature is above temperature set
point, thermostat closes circuits R to G, R to Y1
and R to O (Y2). The compressor, indoor and
outdoor fans, and reversing valve are energized.
c. ELECTRIC HEATING MODE
(1.) Thermostat closes circuit R to W/W1, or W2 and R
to G. There are no on or off delays.
INDOOR
THERMOSTAT
RETURN
AIR
FROM
POWER
SOURCE
TOP COVER
DISCONNECT
PER NEC
POWER ENTRY
CONTROL ENTRY
A09098
Fig. 11 -- Typical Installation
Table 2 – Minimum Airflow for Reliable Electric Heater Operation (CFM)
SIZE
AIRFLOW (CFM)
AIRFLOW (L/s)
50JZ-- A24
800
378
50JZ-- A30
1000
472
11
50JZ-- A36
1200
567
50JZ-- A48
1600
756
50JZ-- A
Accessory Electric Heaters Installation
50JZ-- A
A09504
Fig. 12 -- Wiring Schematics 400--3--50
12
A00010
LED
OFF
FLASHING
ON
STATUS
No call for compressor operation
Reversed phase
Normal
Fig. 13 -- Phase Monitor Control and LED Indicators
PRE--START--UP
!
WARNING
FIRE,
EXPLOSION,
ELECTRICAL
ENVIRONMENTAL SHOCK HAZARD
START--UP
AND
Failure to follow this warning could result in personal injury,
death or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.
3. Do not remove compressor plug until all electrical
sources are disconnected and tagged.
4. Never attempt to repair soldered connection while
refrigerant system is under pressure.
5. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high-- and low--pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Use the Start--Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove all access panels (see Fig. 18).
Checking Cooling and Heating Control Operation
Start and check the unit for proper control operation as follows:
(1.) Place room thermostat SYSTEM switch or MODE
control in OFF position. Observe that blower
motor starts when FAN mode is placed in FAN ON
position and shuts down when FAN MODE switch
is placed in AUTO position.
(2.) Place SYSTEM switch in cool mode. Lower
setpoint to call for cooling. Observe that
compressor, indoor and outdoor fans start and
deliver cooling.
(3.) Place SYSTEM switch or MODE control in HEAT
position. Set control above room temperature.
Observe that compressor, outdoor fan, and indoor
blower motors start. Observe that heating cycle
shuts down when control setting is satisfied.
NOTE: Once the compressor has started and then has stopped, it
should not be started again until 5 minutes have elapsed. The
defrost board has a built--in 5 minute delay between cycles. The 5
minute compressor delay also applies to heat pump heating mode.
Step 1 — Check for Refrigerant Leaks
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system pressure
has been relieved and reclaimed from both high-- and
low--pressure ports.
2. Repair leak following Refrigerant Service procedures.
NOTE: Install a bi--flow filter drier whenever the system has been
opened for repair.
3. Add a small charge of R--410A refrigerant vapor to system
and leak--test unit.
4. Recover refrigerant from refrigerant system and evacuate to
500 microns if no additional leaks are not found.
13
50JZ-- A
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak. Leak--test all refrigerant tubing
connections using electronic leak detector, or
liquid--soap solution. If a refrigerant leak is detected, see
following Check for Refrigerant Leaks section.
c. Inspect all field and factory--wiring connections. Be sure
that connections are completed and tight. Ensure wires
do not touch refrigerant tubing or sharp sheet metal
edges.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that outdoor--fan blade is correctly positioned
in fan orifice.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain pan and trap are filled
with water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
5. Each unit system has 2 Schrader--type ports, one low--side
Schrader fitting located on the suction line, and one
high--side Schrader fitting located on the compressor
discharge line. Be sure that caps on the ports are tight.
5. Charge unit with Puron (R--410A) refrigerant, using an
electronic scale. Refer to unit rating plate for required
charge.
Step 2 — Start--Up Adjustments
Checking and Adjusting Refrigerant Charge
The refrigerant system is fully charged with Puron (R--410A)
refrigerant and is tested and factory sealed.
NOTE:
Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper Puron
(R--410A) charge.
A superheat charging chart is attached to the inside of the
compressor access panel (see Fig. 18). The chart includes the
required suction line temperature at given suction line pressures
and outdoor ambient temperatures.
INDOOR COIL
OUTDOOR COIL
LCS
COMPRESSOR
ACCUMULATOR
TXV in Metering
Position
HP S
Bypass
Position
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater®Metering De vice
Arrow indicates direction of flo w
C03011
Fig. 14 -- Typical Heat Pump Operation, Cooling Mode
INDOOR COIL
OUTDOOR COIL
TXV in Bypass
Position
LCS
COMPRESSOR
ACCUMULATOR
50JZ-- A
Complete the required procedures given in the Pre--Start--Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit in Cooling mode
when the outdoor temperature is below 40_F (4_C) (unless
accessory low--ambient kit is installed).
IMPORTANT: Three--phase, scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3--phase power lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor. The 3--phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction and
discharge pressures may be minimal
An accurate thermocouple-- or thermistor--type thermometer, and a
gauge manifold are required when using the superheat charging
method for evaluating the unit charge. Do not use mercury or small
dial--type thermometers because they are not adequate for this type
of measurement.
NOTE: Allow system to operate for a minimum of 15 minutes
before checking or adjusting refrigerant charge.
IMPORTANT: When evaluating the refrigerant charge, an
indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
Proceed as follows:
1. Remove cap from low pressure service fitting.
2. Using hoses with valve core depressors, attach low pressure
gauge hose to low pressure service fitting.
3. Start the unit in cooling mode and let run until system
pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient--air temperature (°C) db.
b. Evaporator inlet--air temperature (°C) wb.
c. Suction--tube temperature (°C) at low--side service
fitting.
d. Suction (low--side) pressure (kPA).
5. Using “Cooling Charging Tables” compare outdoor--air
temperature (°C) db with the entering evaporator air temperature (°C) wb to determine desired superheat temperature.
(See Fig. 16).
HP S
Metering
Position
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater®Metering De vice
Arrow indicates direction of flo w
C03012
Fig. 15 -- Typical Heat Pump Operation, Heating Mode
14
NOTE: Be sure that all supply--and return--air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
Indoor Airflow and Airflow Adjustments
!
CAUTION
Table 3 – Color Coding for Indoor Fan Motor Leads
Black = High Speed
Blue = Med Speed (if available)
Red = Low Speed
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit damage.
For heating and cooling operation, the recommended
airflow is 350 to 450 cfm for each 12,000 Btuh (165 L/s to
212 for each 3.5 kW) of rated cooling capacity. For units
with optional electric heat, the airflow must not be reduced
below the levels stated in Table 1.
WARNING
!
To change the speed of the indoor fan motor, remove the fan lead
from the splice connection. Replace with the desired fan speed
lead. Insulate the unused lead to prevent shorting.
50ES500443 - 2.0
A09336
Fig. 16 -- Cooling Charging Table--Superheat
15
50JZ-- A
6. Using the superheat value in step 5, locate the intersection
of the required superheat with the suction pressure previously measured. Note the required suction tube temperature.
Using a tolerance of +/-- 1.7°C, add refrigerant if actual
temperature is higher than charted suction tube temperature,
or remove refrigerant if actual temperature is lower than
charted suction tube temperature.
NOTE:
If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
Table 4 – Wet Coil Air Delivery
UNIT
50JZ--- A24
50JZ--- A30
50JZ--- A36
50JZ-- A
50JZ--- A48
UNIT
50JZ--- A24
50JZ--- A30
50JZ--- A36
50JZ--- A48
MOTOR
SPEED
Watts
Low
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
High
Cfm
0.0
303
969
------------552
1296
----692
1571
-----
0.1
305
879
----1002
1189
----540
1237
----686
1509
-----
0.2
306
785
----954
1115
----529
1167
----678
1444
1112
1693
MOTOR
SPEED
Watts
Low
L/s
Watts
High
L/s
Watts
Low
L/s
Watts
High
L/s
Watts
Low
L/s
Watts
High
L/s
Watts
Low
L/s
Watts
High
L/s
0
303
458
------------552
612
----692
741
-----
25
305
415
----1002
561
----540
584
----686
712
-----
50
303
371
----954
526
----529
551
----678
681
1112
799
ENGLISH
400 VOLT
EXTERNAL STATIC PRESSURE (IN. W.C)
0.3
0.4
0.5
0.6
0.7
300
--------687
----------435
428
428
422
--963
833
758
676
921
889
853
814
--1041
971
903
833
----------700
--------1223
523
514
480
----1097
1029
952
--------782
765
736
----1467
1398
1321
664
652
664
736
--1370
1295
1240
1237
--930
856
834
825
811
1670
1601
1521
1447
1378
SI
400 VOLT
EXTERNAL STATIC PRESSURE (Pa)
75
100
125
150
175
300
--------324
----------435
428
428
422
--455
393
358
319
921
889
853
814
--491
458
426
393
----------700
--------577
523
514
480
----518
486
449
--------782
765
736
----693
660
624
664
652
664
736
--647
611
585
584
--930
856
834
825
811
788
756
718
683
650
0.8
------------683
1142
----721
1237
----793
1294
0.9
------------688
1075
----780
1165
---------
1.0
------------755
1058
----1002
1137
---------
200
------------683
539
----721
584
----793
611
225
------------688
508
----780
550
---------
250
------------755
499
----1002
536
---------
*Air delivery values are based on operating voltage of 400 ---v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain static
pressure available for ducting.
NOTES: 1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh (165 L/s for each 3.5 kW) of rated cooling capacity. Evaporator
coil frosting may occur at airflow below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
Table 5 – Filter Pressure Drop (IN. W.C.) (Pa)
FILTER SIZE
in.
500
600
700
800
900
1000
1100
1200
1300
CFM
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
20X20X1
0.05
0.07
0.08
0.10
0.12
0.13
0.14
0.15
—
—
—
—
—
—
—
—
—
—
—
20X24X1
—
—
—
---
0.09
0.10
0.11
0.13
0.14
0.15
0.16
—
—
—
—
—
—
—
—
24X30X1
—
—
—
---
---
---
---
0.07
0.08
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
FILTER SIZE
mm
236
283
330
378
425
472
519
566
614
0.09
L/s
661
707
755
802
850
896
944
991
1038
1085
508X508X25
12.4
17.4
19.9
24.9
29.9
32.3
34.8
37.3
—
—
—
—
—
—
—
—
—
—
—
508X610x25
—
—
—
---
22.4
24.9
27.4
32.3
34.8
37.4
39.9
—
—
—
—
—
—
—
—
610X762x25
—
—
—
---
---
---
---
17.4
19.9
22.4
24.9
27.4
29.9
32.3
34.8
37.3
39.8
42.3
44.6
Table 6 – Accessory Electric Heat Pressure Drop IN. W.C. (Pa)
HEATER kW
6.5 -- 17.4
600
0.030
800
0.033
1000
0.037
1200
0.042
283
7.5
378
8.2
472
9.2
569
10.4
CFM
1400
0.047
L/s
661
11.7
16
1600
0.052
1800
0.060
2000
0.067
2200
0.075
755
12.9
850
14.9
944
16.7
1038
18.7
OF1
DFT
OF2
T2 C C O
T1
O R W2 Y C
P1
50JZ-- A
Y
30
30
60
120
60
P3
ON
DFT
QUIET
SHIFT
90
INTERVAL TIMER OFF
J1
SPEEDUP
Speedup
Pins
Quiet
Shift
Defrost interval
DIP switches
A08020
Fig. 17 -- Defrost Control
Step 3 — Defrost Control
Quiet Shift
Quiet Shift is a field--selectable defrost mode, which will eliminate
occasional noise that could be heard at the start of defrost cycle and
restarting of heating cycle. It is selected by placing DIP switch 3
(on defrost board) in ON position.
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Reversing
valve will energize, outdoor fan will turn off, compressor will turn
off for 30 sec and then turn back on to complete defrost. At the
start of heating after conclusion of defrost reversing valve will
de--energize, compressor will turn off for another 30 sec, and the
outdoor fan will stay off for 40 sec, before starting in the Heating
mode.
Defrost
The defrost control is a time/temperature control which includes a
field--selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at
60 minutes). To initiate a forced defrost, two options are available
depending on the status of the defrost thermostat.
If defrost thermostat is closed, speed--up pins (J1) must be shorted
by placing a flat head screw driver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle, as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with
compressor operation). On return to heating operation, compressor
will again turn off for an additional 30 sec and the outdoor fan for
40 sec. When the Quiet Shift is in OFF position, only a brief 30
sec. cycle will be observed.
NOTE: Unit will remain in defrost until defrost thermostat
reopens at approximately 65_F +/-- 5_F (18_C +/-- 2.8_C) coil
temperature at liquid line or remainder of defrost cycle time.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This heat pump unit should
be inspected at least once each year by a qualified service person.
To troubleshoot unit, refer to Table 7.
NOTE: TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
17
!
WARNING
WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death and unit component damage.
Failure to follow this warning could result in personal injury
or death.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical skills, tools
and equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment, other than those
procedures recommended in the Owner’s Manual.
Disconnect and tag electrical power to the unit before cleaning
the blower motor and wheel.
!
WARNING
ELECTRICAL SHOCK HAZARD
50JZ-- A
!
Failure to follow these warnings could result in personal
injury or death:
1. Turn off electrical power to the unit and install a lockout
tag before performing any maintenance or service on this
unit.
2. Use extreme caution when removing panels and parts.
3. Never place anything combustible either on or in contact
with the unit.
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
operation.
Errors made when reconnecting wires may cause improper
and dangerous operation. Label all wires prior to
disconnecting when servicing.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness each
cooling season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each cooling season. Service when
necessary.
To clean the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove blower access panel (see Fig 18).
b. Disconnect indoor blower motor. Remove capacitor if
required.
c. On all units remove blower assembly from unit.
Remove screws securing blower to blower partition and
slide assembly out. Be careful not to tear insulation in
blower compartment.
d. Ensure proper reassembly by marking blower wheel and
motor in relation to blower housing before disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft,
remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of
housing.
2. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orientation.
b. Lift wheel from housing. When handling and/or
cleaning blower wheel, be sure not to disturb balance
weights (clips) on blower wheel vanes.
c. Remove caked--on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from
wheel and housing with vacuum cleaner, using soft
brush attachment. Remove grease and oil with mild
solvent.
d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of
shaft. Reinstall blower into unit. Reinstall capacitor.
f. Reconnect blower motor wiring.
g. Reinstall blower access panel (see Fig. 18).
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during cooling
cycles.
Step 1 — Air Filter
IMPORTANT: Never operate the unit without a suitable air filter
in the return--air duct system. Always replace the filter with the
same dimensional size and type as originally installed. See Table 1
for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway--type) or clean (cleanable--type) at least twice during
each cooling season and twice during the heating season, or
whenever the filter becomes clogged with dust and lint.
Indoor Blower and Motor
NOTE: All motors are pre--lubricated. Do not attempt to lubricate
these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
Compressor
Access Panel
Blower
Access
Panel
Control
Access
Panel
A09210
Fig. 18 -- Unit Access Panels
18
Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all
obstructions, including weeds and shrubs, that interfere with the
airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent--and--water solution.
Rinse coils with clear water, using a garden hose. Be careful not to
splash water on motors, insulation, wiring, or air filter(s). For best
results, spray condenser coil fins from inside to outside the unit. On
units with an outer and inner condenser coil, be sure to clean
between the coils. Be sure to flush all dirt and debris from the unit
base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing all
foreign matter from the pan. Flush the pan and drain trough with
clear water. Do not splash water on the insulation, motor, wiring, or
air filter(s). If the drain tube is restricted, clear it with a plumbers
snake or similar probe device.
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 6 — Indoor Airflow
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply--air and return--air grilles are open and free
from obstructions, and that the air filter is clean. When necessary,
refer to Indoor Airflow and Airflow Adjustments section to check
the system airflow.
Step 7 — Metering Device -- Piston
This unit uses a fixed orifice metering device for both cooling and
heating modes.
50JZ-- A
Step 2 — Outdoor Coil, Indoor Coil, and
Condensate Drain Pan
Step 3 — Outdoor Fan
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off
motor shaft.
5. When replacing fan blade, position blade back to same position as before.
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
Step 4 — Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panels (see Fig. 18) to locate all the electrical
controls and wiring. Check all electrical connections for tightness.
Tighten all screw connections. If any discolored or burned
connections are noticed, disassemble the connection, clean all the
parts, restrip the wire end and reassemble the connection properly
and securely.
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check
each electrical component with the proper electrical
instrumentation. Refer to the unit wiring label when making these
checkouts.
Step 5 — Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low performance is suspected, leak--test all
refrigerant tubing using an electronic leak detector, or liquid--soap
C99097
Fig. 19 -- Refrigerant Circuit
Step 8 — Pressure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R--410A)
systems. R--22 pressure switches must not be used as replacements
for the Puron (R--410A) system.
Step 9 — Loss of Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig (138 kPa). If system pressure is above this,
switch should be closed. To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
NOTE: Because these switches are attached to refrigeration
system under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read 0 psi. Never open system
without breaking vacuum with dry nitrogen.
19
Step 10 — High--Pressure Switch
Servicing Systems on Roofs with Synthetic Materials
The high--pressure switch is located in the discharge line and
protects against excessive condenser coil pressure. It opens at 650
psig (4482 kPa).
POE (polyolester) compressor lubricants are known to cause long
term damage to some synthetic roofing materials. Exposure, even if
immediately cleaned up, may cause embrittlement (leading to
cracking) to occur in one year or more. When performing any
service that may risk exposure of compressor oil to the roof, take
appropriate precautions to protect roofing. Procedures which risk
oil leakage include, but are not limited to, compressor replacement,
repairing refrigerant leaks, replacing refrigerant components such
as filter drier, pressure switch, metering device, coil, accumulator,
or reversing valve.
Synthetic Roof Precautionary Procedure
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drip cloth or tarp. Cover an
approximate 10x10 ft (3x3 m) area.
2. Cover area in front of the unit service panel with a terry
cloth shop towel to absorb lubricant spills and prevent
run--offs, and protect drop cloth from tears caused by tools
or components.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run--offs
through the louvered openings in the unit base.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
High pressure may be caused by a dirty outdoor coil, failed fan
motor, or outdoor air recirculation.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
50JZ-- A
Step 11 — Copeland Scroll Compressor (Puron
Refrigerant)
The compressor used in this product is specifically designed to
operate with Puron (R--410A) refrigerant and cannot be
interchanged.
!
WARNING
EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refrigerant
and oils.
The scroll compressor pumps refrigerant throughout the system by
the interaction of a stationary and an orbiting scroll. The scroll
compressor has no dynamic suction or discharge valves, and it is
more tolerant of stresses caused by debris, liquid slugging, and
flooded starts. The compressor is equipped with an internal
pressure relief port. The pressure relief port is a safety device,
designed to protect against extreme high pressure. The relief port
has an operating range between 550 and 625 psig differential
pressure (3792 and 4309 kPa).
Step 12 — Refrigerant System
This step covers the refrigerant system of the 50JZ--A, including
the compressor oil needed, servicing systems on roofs containing
synthetic materials, the filter drier and refrigerant charging.
Refrigerant
!
Liquid Line Filter Drier
The biflow filter drier is specifically designed to operate with
Puron. Use only factory--authorized components. Filter drier must
be replaced whenever the refrigerant system is opened. When
removing a filter drier, use a tubing cutter to cut the drier from the
system. Do not unsweat a filter drier from the system. Heat from
unsweating will release moisture and contaminants from drier into
system.
Puron (R-- 410A) Refrigerant Charging
Refer to unit information plate and charging chart. Some R--410A
refrigerant cylinders contain a dip tube to allow liquid refrigerant to
flow from cylinder in upright position. For cylinders equipped
with a dip tube, charge Puron units with cylinder in upright
position and a commercial metering device in manifold hose.
Charge refrigerant into suction--line.
Step 13 — System Information
Loss of Charge Switch
WARNING
PROPERTY HAZARD, PERSONAL INJURY OR
ENVIRONMENTAL HAZARD
Failure to follow this warning could result in property damage
or personal injury or death.
This system uses Puron (R--410A) refrigerant which has
higher operating pressures than R--22 and other refrigerants.
No other refrigerant may be used in this system. Gauge set,
hoses, and recovery system must be designed to handle Puron.
If you are unsure consult the equipment manufacturer.
Compressor Oil
The Copeland scroll compressor uses 3MAF POE oil. If additional
oil is needed, use Uniqema RL32--3MAF. If this oil is not
available, use Copeland Ultra 32 CC or Mobil Arctic EAL22 CC.
This oil is extremely hygroscopic, meaning it absorbs water
readily. POE oils can absorb 15 times as much water as other oils
designed to HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
The loss of charge switch is a protective device wired into control
circuit (low voltage). It shuts off the compressor if abnormally low
pressures are present in the refrigeration circuit.
NOTE: Because these switches are attached to refrigeration
system under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read zero gauge. Never open system
without breaking vacuum with dry nitrogen.
Check Defrost Thermostat
The defrost thermostat is usually located on the lowest liquid
leaving circuit of the left condenser coil (see Fig. 20). The
thermostat closes at 32_F +/-- 3_F (0_C +/-- 1.7_C) and opens at
65_F +/-- 5_F (18_C +/-- 2.8_C).
The defrost thermostat signals heat pump that conditions are right
for defrost or that conditions have changed to terminate defrost. It
is a thermally actuated switch clamped to outdoor coil to sense its
temperature.
NOTE: The defrost thermostat must be located on the liquid side
of the outdoor coil on the bottom circuit and as close to the coil as
possible.
20
TROUBLESHOOTING
FEEDER TUBE
STUB TUBE
Refer to the Cooling and Heating Troubleshooting Chart (Table 7)
for troubleshooting information.
START--UP CHECKLIST
Use the Start--Up Checklist.
DEFROST
THERMOSTAT
C99029
50JZ-- A
Fig. 20 -- Defrost Thermostat
PURONR (R--410A) QUICK REFERENCE GUIDE
Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement
components are designed to operate with Puron
S Puron refrigerant cylinders are rose colored.
S
S
S
Recovery cylinder service pressure rating must be 400 psig (2758 kPa), DOT 4BA400 or DOT BW400.
Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
charging into suction line with compressor operating
S
Manifold sets should be minimum 700 psig (4826 kPa) high side and 180 psig (1241 kPa) low side with 550 psig (3792 kPa)
low--side retard.
S
Use hoses with minimum 700 psig (4826 kPa) service pressure rating.
S
Leak detectors should be designed to detect HFC refrigerant.
S
Puron, as with other HFCs, is only compatible with POE oils.
S
Vacuum pumps will not remove moisture from oil.
S
Do not use liquid--line filter driers with rated working pressures less than 600 psig (4137 kPa).
S
Do not leave Puron suction line filter driers in line longer than 72 hours.
S
Do not install a suction--line filter drier in liquid line.
S
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S
POE oils may cause damage to certain plastics and roofing materials.
S
Wrap all filter driers and service valves with wet cloth when brazing.
S
A factory approved liquid--line filter drier is required on every unit.
S
Never open system to atmosphere while it is under a vacuum.
S
When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.
S
Do not vent Puron into the atmosphere.
S
Observe all warnings, cautions, and bold text.
21
Table 7 – Troubleshooting Chart
SYMPTOM
Compressor and condenser fan will not start.
CAUSE
Power failure
Fuse blown or circuit breaker tripped
Defective contactor, transformer, or high--pressure,
loss--of--charge or low--pressure switch
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Compressor will not start but condenser fan
runs
Faulty wiring or loose connections in compressor circuit
Compressor motor burned out, seized, or
internal overload open
Defective run/start capacitor, overload, start relay
50JZ-- A
One leg of 3--phase power dead
Three--phase scroll compressor
makes excessive noise, and there may be a
low pressure differential.
Scroll compressor is rotating in the wrong direction
Refrigerant overcharge or undercharge
Compressor cycles (other than normally satisfying thermostat).
Compressor operates continuously
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, overload or start relay
Defective thermostat
Faulty condenser--fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Mechanical damage in compressor
Air in system
Excessive head pressure
Condenser coil dirty or restricted
Dirty air filter
Dirty condenser coil
Refrigerant overcharged
Air in system
Head pressure too low
Excessive suction pressure
Suction pressure too low
Condenser air restricted or air short--cycling
Low refrigerant charge
Compressor IPR leaking
Restriction in liquid tube
High heat load
Compressor IPR leaking
Refrigerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Temperature too low in conditioned area
Outdoor ambient below 55°F (12.7°C)
Filter drier restricted
22
REMEDY
Call power company
Replace fuse or reset circuit breaker
Replace component
Determine cause and correct
Check wiring diagram and rewire correctly
Lower thermostat setting below room temperature
Check wiring and repair or replace
Determine cause
Replace compressor
Determine cause and replace
Replace fuse or reset circuit breaker
Determine cause
Correct the direction of rotation by reversing the
3--phase power leads to the unit.
Recover refrigerant, evacuate system, and recharge to capacities shown on rating plate
Replace and determine cause
Determine cause and correct
Determine cause and correct
Determine cause and replace
Replace thermostat
Replace
Locate restriction and remove
Replace filter
Decrease load or increase unit size
Reset thermostat
Locate leak, repair, and recharge
Replace compressor
Recover refrigerant, evacuate system, and recharge
Clean coil or remove restriction
Replace filter
Clean coil
Recover excess refrigerant
Recover refrigerant, evacuate system, and recharge
Determine cause and correct
Check for leaks, repair, and recharge.
Replace compressor
Remove restriction
Check for source and eliminate
Replace compressor
Recover excess refrigerant
Replace filter
Check for leaks, repair and recharge
Remove source of restriction
Increase air quantity
Check filter–replace if necessary
Reset thermostat
Install low--ambient kit
Replace filter
START--UP CHECKLIST
(Remove and Store in Job Files)
II. PRESTART--UP (Insert check mark in box as each item is completed)
( ) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
( ) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
( ) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
( ) CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE
( ) VERIFY THAT UNIT INSTALLATION IS LEVEL
( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS
III. START--UP
ELECTRICAL
SUPPLY VOLTAGE
COMPRESSOR AMPS
INDOOR (EVAPORATOR) FAN AMPS
TEMPERATURES
OUTDOOR (CONDENSER) AIR TEMPERATURE
DB
RETURN--AIR TEMPERATURE
DB
WB
COOLING SUPPLY AIR
DB
WB
HEAT PUMP SUPPLY AIR _____________________
ELECTRIC HEAT SUPPLY AIR _____________
PRESSURES
REFRIGERANT SUCTION
PSIG, SUCTION LINE TEMP*
REFRIGERANT DISCHARGE
PSIG, LIQUID TEMP{
( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
* Measured at suction inlet to compressor
{ Measured at liquid line leaving condenser.
23
50JZ-- A
I. PRELIMINARY INFORMATION
MODEL NO.:
SERIAL NO.:
DATE:
TECHNICIAN:
50JZ-- A
Copyright 2010 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Edition Date: 08/10
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
Catalog No: 50JZ---C5SI
Replaces: 50JZ--- C4SI