Carrier WeatherExpert 48JC04 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480282-01 Printed in U.S.A. Form 48JC-4-6-01SI Pg 1 5-2020 Replaces: New
Installation Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . 7
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . . 7
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 — Provide Unit Support. . . . . . . . . . . . . . . . . . 7
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 9
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 9
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required). . . . . . . . . . . . . . . . . . 10
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 11
• ECONOMIZER HOOD PACKAGE REMOVAL AND
SETUP (FACTORY OPTION)
• ECONOMIZER HOOD
Step 9 — Units with Hinged Panels Only . . . . . . . . . 12
Step 10 — Install Flue Hood . . . . . . . . . . . . . . . . . . . 12
Step 11 — Install Gas Piping. . . . . . . . . . . . . . . . . . . 12
• FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS)
Step 12 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 13 — Make Electrical Connections . . . . . . . . . 16
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• UNITS WITHOUT FACTORY-INSTALLED
NON-FUSED DISCONNECT OR HACR
• ALL UNITS
• CONVENIENCE OUTLETS
• HACR AMP RATING
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• FIELD CONTROL WIRING
• SPACE TEMPERATURE SENSOR (SPT)
• THERMOSTAT
• HEAT ANTICIPATOR SETTINGS
• HUMIDI-MIZER® CONTROL CONNECTIONS
• TYPICAL UNIT WIRING DIAGRAMS
Integrated Gas Controller. . . . . . . . . . . . . . . . . . . . . .27
Controller Options . . . . . . . . . . . . . . . . . . . . . . . . . . .29
• LOW AMBIENT
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Step 14 — Adjust Factory-Installed Options . . . . . .30
• SMOKE DETECTORS
Step 15 — Install Accessories. . . . . . . . . . . . . . . . . .30
Step 16 — Fan Speed Set Up. . . . . . . . . . . . . . . . . . .30
• SYSTEMVU™ CONTROLS
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult local
building codes and appropriate national electrical codes (in USA,
ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA
C22.1) for special requirements.
It is important to 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 the signal words DANGER, WARNING, CAUTION,
and NOTE. 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 can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all disconnect
locations to alert others not to restore power until work is
completed.
WeatherExpert®
48JC04-06 Ultra High Efficiency
Single Package Rooftop Gas Heating/Electric Cooling Unit
with Puron®(R-410A) Refrigerant

2
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS
See Fig. 1 for 48JC model number nomenclature. See Fig. 2 (on
pages 4 - 6) for unit dimensional drawings and service clearance
dimensions.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig (3450 Pa). Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure testing
field-supplied gas piping at pressures of 0.5 psig or less, a unit
connected to such piping must be isolated by closing the
manual gas valve(s).
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refriger-
ants and oils.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing air conditioning
equipment.
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe person-
al injury or death due to carbon-monoxide poisoning, if
combustion products infiltrate into the building.
Check that all openings in the outside wall around the vent
(and air intake) pipe(s) are sealed to prevent infiltration of
combustion products into the building.
Check that furnace vent (and air intake) terminal(s) are not
obstructed in any way during all seasons.
AVERTISSEMENT
RISQUE D’INTOXICATION AU MONOXYDE DE
CARBONE
Si ces directives ne sont pas suivies, cela peut entraîner des
blessures graves ou une intoxication au monoxyde de car-
bone pouvant causer la mort, si des produits de combustion
s’infiltrent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur
extérieur autour du ou des tuyaux d’évent (et de la prise
d’air) sont scellées de manière à empêcher l’infiltration de
produits de combustion dans le bâtiment.
Veiller à ce que la ou les sorties de l’évent de l’appareil de
chauffage (et la prise d’air) ne soient, en aucune façon, ob-
struées, quelle que soit la saison.
WARNING
FIRE HAZARD
Failure to follow this warning could result in severe person-
al injury and/or property damage.
Inlet pressure tap set screw must be tightened and 1/8-in.
NPT pipe plug must be installed to prevent gas leaks.
WARNING
FIRE HAZARD
Failure to follow this warning could result in severe person-
al injury and/or property damage.
Manifold pressure tap set screw must be tightened and 1/8-
in. NPT pipe plug must be installed to prevent gas leaks.
GAS VALVE
INLET PRESSURE
TAP SET SCREW
MANIFOLD
GAS VALVE
MANIFOLD PRESSURE
TAP SET SCREW

3
Rated Indoor Airflow
Table 1 lists the rated indoor airflow used for the AHRI effi-
ciency rating for the units covered in this document.
Table 1 — Rated Indoor Airflow
Fig. 1 — 48JC 04-06 Model Number Nomenclature (Example)
MODEL NUMBER RATED INDOOR AIRFLOW (CFM)
48JC**04 1125
48JC**05 1430
48JC**06 2000
48JCDV06A2A5–3A0 A 0
Cooling Tons
04 - 3 ton
05 - 4 ton
06 - 5 ton
1
Example:
Position: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Heat Options
D = Low Gas Heat
E = Medium Gas Heat
F = High Gas Heat
S = Low Heat with Stainless Steel HX (Heat
Exchanger)
R = Medium Heat with Stainless Steel HX
T = High Heat with Stainless Steel HX
Sensor Options
A = None
B = RA (Return Air) Smoke Detector
C = SA (Supply Air) Smoke Detector
D = RA + SA Smoke Detector
E = CO2
F = RA Smoke Detector and CO2
G = SA Smoke Detector and CO2
H = RA + SA Smoke Detector and CO2
J = Condensate Overflow Switch (electro-mechanical controls only)
K = Condensate Overflow Switch and RA Smoke Detector
L = Condensate Overflow Switch and RA and SA Smoke Detectors
M = Condensate Overflow Switch and SA Smoke Detector
N = Condensate Overflow Switch and
CO2
P = Condensate Overflow Switch w/
CO2 + RA Smoke Detector
Q = Condensate Overflow Switch w/ CO2 + SA Smoke Detector
R = Condensate Overflow Switch w/
CO2 + RA and SA Smk. Det.
Vane Axial Fan - Indoor Fan Options
1 = Direct Drive EcoBlue™ - Standard Static
2 = Direct Drive EcoBlue - Medium Static
3 = Direct Drive EcoBlue - High Static
Coil Options - Round Tube/Plate Fin Condenser Coil
(Outdoor - Indoor - Hail Guard)
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu - Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Voltage
1 = 575/3/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
–= Factory Design Revision
Base Unit Controls
3 = SystemVu™ Controls - Standard all units
Air Intake / Exhaust Options
A = None
B = Temperature EconoMi$er®2 w/ Barometric Relief
F = Enthalpy EconoMi$er2 w/ Barometric Relief
U = Ultra Low Leak Temperature EconoMi$er2 w/
Barometric Relief
W= Ultra Low Leak Enthalpy EconoMi$er2 w/
Barometric Relief
Service Options
(Foil Face Insulation Standard)
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Access Panels
4 = Hinged Access Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
6 = MERV 8 High Efficiceny Filters
7 = MERV 8 High Efficiceny Filters and
Unpowered Convenience Outlet
8 = MERV 8 High Efficiceny Filters and
Powered Convenience Outlet
9 = MERV 8 High Efficiceny Filters and
Hinged Panels
A = MERV 8 High Efficiceny Filters, Hinged
Panels and Unpowered Convenience Outlet
B = MERV 8 High Efficiceny Filters, Hinged
Panels and Powered Convenience Outlet
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Breaker
C = Non-Fused Disconnect (NFD)
D = Thru-The-Base (TTB) Connections
E = HACR Circuit Breaker and TTB
F = Non-Fused Disconnect and TTB
N = Phase Monitor Protection
P = Phase Monitor and HACR
Q = Phase Monitor and NFD
R = Phase Monitor and TTB
S = Phase Monitor and HACR and TTB
T = Phase Monitor and NFD and TTB
Refrig. Systems Options
V = Variable Speed Cooling Capacity
W= Variable Speed Cooling Capacity with
Humidi-MiZer®System
Unit Heat Type
48 - Gas Heat Packaged Rooftop
Model Series - WeatherMaster®
JC - Ultra High Efficiency

4
Fig. 2 — Unit Dimensional Drawing

5
Fig. 2 — Unit Dimensional Drawing (cont)