Carrier has designed the Weathermaster series based on customer
needs and requests to be the most
efficient and reliable rooftop unit ever
made.
Features/Benefits
48HJ008-014
48HJ004-007
• Most efficient rooftop line for
cooling using scroll compresso r
technology
• Most efficient rooftop line for
heating using dim pl ed heat
exchangers on all units
• High reliability — non-corrosive
condensate pans, prepainted
cabinets and primed interior
panels, and all units are fully
protected by internal safeties
• Quietest operation — all
compressors mounted on
independent vibration isolators.
Standard, belt-driven evaporator
fan motors on all units
• Ease of maintenance achieved by
self diagnostics on the Integrated
Gas Controller (IGC), optional
direct digital controls, standard
size filters, tool-less filter access,
simple compress or acces s,
permanently lubricated fan
motors, optional disconnect
switch, optional 115-v
convenience outlet, and optional
hinged access pane ls
• Exclusive MoistureMiser
dehumidification package — a
result of recent advances by
Carrier in co nt roll i ng comfort
levels. This factory-installed
option significantly improves the
dehumi dif icat ion capa bili ty of the
rooftop unit and helps control
humidity levels in the building.
Copyright 1999 Carrier CorporationForm 48HJ-11PD
Page 2
Carrier means Top Quality
and Reliability
Each component utilized in the
Weathermaster
and tested for a minimum of 15 years
operation under the harshest
conditions.
Every unit is thoroughly run tested at
the factory in each operating mode
and evacuated prior to final charging.
Every coil is leak tested with helium
particles. Automated run testing allows
accurate, undisputed tests and measurements which are second to none in
the industry.
®
Series is designed
Each unit contains a factory printout indicating tested pressures,
amperages, dates, and inspectors, providing certification of the unit’s status
at the time of manufacture.
Units are equipped with valuable
safety controls designed to monitor
and protect for the life of the unit. The
standard safeties include:
The cabinet is constructed of galvanized steel, bonderized, and coated
with a prepainted baked enamel finish.
The paint finish is a non-chalking type,
and is capable of exceeding Federal
Test Method Standard No. 141
(Method 6061) 500-Hour Salt Spray
Test. In addition, all cabinet panel interior surfaces are primed, allowing the
entire unit to have longer life and a
more attractive appearance.
FULLY MODULATING DURABLADE
ECONOMIZER (OPTION OR ACCESSORY)
SLEEVE BEARING PERMANENTLY
LUBRICATED MOTORS
HIGH-EFFICIENCY COILS
Easy maintenance and
installation
All units are factory shipped in
the vertical discharge configura-
for fit-up to standard roof curbs.
tion
(One accessory curb fits sizes 004007; another accessory curb fits sizes
008-014.) Contractors can order and
install the roof curbs early in the construction stage, before decisions on
size requirements have been made.
All units feature roll-formed base-
design with forklift slots on 3 sides
rail
of the unit and rigging holes for easier
maneuvering and installation. Stretchwrap packaging protects the unit during shipment and storage.
Units are easily converted
vertical to horizontal applications to
make retrofit and add-on jobs easier.
To convert from vertical to horizontal
discharge, simply relocate 2 panels.
The same basic unit can be used for a
variety of applications and can be
quickly modified at the jobsite.
from
Standard high-performance, highstatic, belt-driven evaporator-fan
motors enable 48HJ004-014 units
to operate in most ductwork
configurations.
Ductwork connections are made
by the logical 2 to 1 aspect ratio.
easy
On vertical discharge units, ductwork
attaches directly to the roof curb.
Thru-the-bottom service connection capability
comes standard with
the rooftop unit to allow power and
control wiring and gas connections to
be routed through the unit’s basepan,
thereby minimizing roof penetrations
(to prevent water leaks). Power, gas,
and control connections are made on
the same side of the unit to simplify
installation.
The non-corrosive, sloped, condensate drain pan
is made in conformance with ASHRAE (American
Society of Heating, Refrigeration, and
Air Conditioning Engineers) Standard
62 to meet many Indoor-Air Quality
(IAQ) specifications. The condensate
drain pan offers both bottom and end
drain capability to minimize roof penetrations. The bottom drain can be used
in conjunction with thru-the-bottom
connections. An external trap must be
field supplied.
Standard 2-in. throwaway filters
are easily accessed through an easily
removable filter access panel located
directly above the air intake hood; no
tools are required to change the filters.
All units are designed with a single continuous top piece
to elimi-
nate leaking at the seams or gasketing.
Belt-driven evaporator-fan motors
allow maximum on-site flexibility without changing motors or drives.
Low-voltage wiring connections
are easily made due to the large terminal board which is conveniently located
for quick, simple access.
3
Page 4
Features/Benefits (cont)
Quiet, efficient operation and
dependable performance
All units are equipped with scroll
compressors
with internal vibration isolators for
extremely quiet operation. The scroll
compressors are quieter and more
reliable than reciprocating designs.
Compressors are mounted on an independent base plate for additional
sound integrity and structural support.
Efficient condenser fan and motor
design permits operation at low sound
levels.
Totally enclosed condenser-fan
motors
bearings provide additional
dependability.
All coils use state-of-the-art internally enhanced copper tubing.
Coils are thoroughly tested with helium
particles as well as pressure tested at
the factory. Condenser coils have louvered, aluminum lanced fins to provide
maximum heat transfer for optimum
efficiency and easy cleaning.
Carrier’s exclusive dimpled heat
exchangers
improved efficiency. The tubular design permits hot gases to make multiple passes across the path of the supply air. In addition, dimpled heat exchanger tubes act as baffles, forcing
the hot gases to stay in close contact
with the cell walls to maximize heat
transfer and efficiency.
The California Air Quality Management NO
40 nanograms/joule or less
is met when Low NO
CRLOWNOX001A00 is installed on
004-006 sizes.
The induced draft combustion
system
pearance of flue stacks, and diminishes
the effects of winds on heating operation. The inducer fan draws hot combustion gas through the heat exchanger at the optimum rate for the most effective heat transfer. The induced draft
also prevents contaminants from entering the supply air if a leak in the heat
exchanger occurs.
The direct spark ignition system
saves operating expense when compared to old-style pilot ignition systems. No crossover tube is required,
therefore no sooting or pilot fouling
problems can occur.
which are fully hermetic
and permanently lubricated
optimize heat transfer for
requirement of
x
kit
x
eliminates the unsightly ap-
LP conversion kit —
are designed for natural gas. An LP
Conversion Kit is available as an accessory, if required. Installation of the accessory LP kit simply involves changing the gas orifices to accommodate
liquid propane gas.
Refrigerant circuit protection
assures dependability. All units have
standard:
1) loss-of-charge/low-pressure protection switch which allows operation
at lower ambient conditions while
protecting against low-charge
operation
2) freeze-protection thermostat, which
protects against evaporator coil frost
build-up
3) high-pressure switch, which protects
against above normal operating
pressure
4) filter driers, which trap moisture and
debris in the refrigeration system.
5) Carrier’s exclusive Acutrol™ metering device, which precisely controls
refrigerant flow, preventing slugging and floodback, while maintaining optimum unit performance by
metering the circuits individually.
Two independent compressor circuits
pinpoint comfort control, improved
efficiency, and back-up capability.
1
/2 to 12 ton units) provide
(all 7
Standard units
Carrier controls add reliability,
efficiency, and simplification
Apollo communicating controls
can be ordered as a factory-installed
option. Designed exclusively by
Carrier, the controls can be used to
actively monitor all modes of operation as well as indoor fan status, filter
status, indoor-air quality, supply-air
temperature, and outdoor-air
temperature.
The Apollo control board is factoryinstalled in the rooftop unit control box
and comes equipped with built-in diagnostic capabilities. Light-emitting
diodes (LEDs) simplify troubleshooting
by indicating thermostat commands for
both stages of heating and cooling,
evaporator-fan operation, and economizer operation. The Apollo communicating control is designed to work specifically with Carrier TEMP and VVT
thermostats.
®
The standard control system
readily adaptable to all conventional
and programmable thermostats.
Integrated gas unit controller
(IGC) —
contained in the compact Integrated
Gas Controller (IGC) that is easily accessible for service. The IGC, designed
exclusively by Carrier, provides built in
diagnostic capabilities. An LED simplifies troubleshooting by providing visual
fault notification and system status information. The IGC board provides exclusive anti-cycle protection for its gas
heat operation. The IGC also contains
burner control logic for dependable
heating operation. The LED is visible
without removing the unit control box
access panel. 48HJ units maximize
heating efficiency through the IGC’s
control of evaporator fan ON/OFF delays. The IGC helps make 48HJ units
reliable for many years.
Patented Cycle-LOC™ protection
system
compressor cycling by monitoring
compressor current draw. When lack
of compressor current exists, the
Cycle-LOC circuit board locks out the
compressors. The Cycle-LOC board
may be manually reset by simply
switching thermostat to OFF, and then
back to the Cooling or AUTO modes.
No manipulation of the unit disconnect
switch is needed.
All ignition components are
provides protection against
Indoor-air quality (IAQ)
The quality of building air is improved
utilizes certain key features that assist
in improving indoor air quality. A
sloped condensate pan eliminates possible biological growth in the rooftop
unit. A face-split evaporator coil design
proves effective in removing additional
moisture from the supply air. Two-in.
filters are standard in all rooftop units
and an optional filter status sensor is
available.
as the Weathermaster
is
®
series
4
Page 5
Another optional IAQ feature
®
the Weathermaster
unit is the exclu-
for
sive MoistureMiser dehumidification
package. This is a factory-installed
option that provides increased dehumidification by cooling the hot liquid
refrigerant leaving the condenser coil.
The MoistureMiser consists of a subcooling coil located on the leaving-air
side of the evaporator coil. The location of this coil in the indoor airstream
enhances the latent capacity of the
48HJ units by as much as 40%. Many
buildings suffer from humidity damage
or poor indoor air quality due to humid
conditions. The improved latent
capacity provided by the MoistureMiser
option reduces the building’s humidity,
eliminating potential property damage
and making the space more
comfortable.
The MoistureMiser option makes the
48HJ units the ideal IAQ rooftop for
hot and humid regions. The operation
of the MoistureMiser package can be
controlled by a field-installed, wallmounted humidistat. The circuit activates only when needed (using the humidistat) as opposed to some dehumidification systems that operate continuously. The humidistat can be set for
any humidity level between 20% and
80% relative humidity.
Energy$Recycler — the IAQ solution for today’s “tight” buildings.
Indoor-air quality (IAQ) generally refers
to the level of pollutants inside a building. These pollutants include cigarette
smoke, carbon dioxide exhaled by
occupants, radon gas, car exhaust,
paint fumes, and odors.
Concern over increased indoor air
pollutants has been spurred by several
issues: 1) changes in new building construction methods and retrofit of older
buildings have reduced air infiltration
rates; 2) Synthetic materials release airborne particles, odors, and chemicals;
and 3) HVAC (heating, ventilation, and
air conditioning) systems that bring in
minimal fresh air.
In 1989, IAQ concerns caused
ASHRAE to recommend increased
ventilation for all public buildings. Simply introducing fresh air into a building,
however, is not always practical or cost
effective. Additional ventilation can
overload HVAC systems and increase
energy costs.
Carrier’s 62AQ Energy$Recycler
unit solves this dilemma by providing
increased fresh air while keeping
increased costs to a minimum. In addition, the Energy$Recycler helps reduce
humidity levels, which helps to prevent
deterioration of building materials and
retards the growth of mold and mildew.
The 62AQ Energy$Recycler unit
provides the best solution to retaining
the energy-conserving benefits of today’s tighter building construction
while improving indoor-air quality.
Serviceability
Servicing a rooftop unit has never
been easier
hinged panel option. This option includes hinged access panels for filter,
compressor, evaporator-fan motor, and
control box areas. These panels provide quick and simple access to the major components by simply unlocking
and swinging open the different panels. Each hinged access panel is permanently attached to the rooftop unit,
eliminating the problem of access panels being dropped and creating a hole
in the roof (potentially causing a water
leak). This type of damage could void
any warranty offered for a new roof.
Optional packages also include the
following features to assist in servicing
the rooftop unit:
• 115-v convenience outlet to power
up electric drills, lights, and refrigerant recovery machines. This
means you are no longer required to
run a separate 115-v power supply
to your 48HJ rooftops. It can now
be factory installed.
with the factory-installed
FRESH AIR
INLET
MOUNTING
KIT
EXHAUST
AIR
FILTER
ACCESS
UNIT WITH ENERGY$RECYCLER
RETURN AIR
BAFFLE
SUPPLY AIR
RETURN AIR
CONDENSER-FAN
DISCHARGE AIR
ROOF CURB
OUTDOOR AIRFLOW
INDOOR AIRFLOW
OUTDOOR-AIR
INLET
5
Page 6
Features/Benefits (cont)
• Non-fused disconnect switch to
remove power locally at the rooftop. This option also includes a
power lockout capability to protect
the service person. This lockout
switch saves the service person time
and effort because there is no need
to access a distant disconnect switch
while servicing the unit.
• Durablade economizer
• EconoMi$er with microprocessor
control and optional power exhaust
• Apollo direct digital controls to
monitor rooftop operation from a
remote site.
Standardized components
complete Weathermaster® line of
products are found in all safety devices,
condenser-fan motors, evaporator-fan
motors, and control boards, while the
gas sections use common inducer
motors, limit switches, and rollout
switches. This allows for greater inventory control, familiarity of parts, and
fewer stocked parts.
Easily accessible refrigerant access ports
on all discharge, suction,
and liquid lines permit easy and accurate measurements as well as simple
accessibility.
Model number nomenclature
48 HJ E 004 Z – B 3 – – AA
for the
Resettable 24-v circuit breaker on
48HJ008-014 units
allows room
for error without replacing transformers or fuses.
Single-side utility connections
provide easy access to perform any
necessary service.
Color-coded wires
permit easy trac-
ing and diagnostics.
Belt-driven motors
are accessible
through a single access door to facilitate servicing and adjusting after
installation.
Compressors and safety switches
are easily accessible
4...16 x 20 x 24...16 x 20 x 24...20 x 20 x 24...20 x 20 x 2
Throwaway
11
Page 12
Options an d accesso ries
LOW AMBIENT CONTROLS
The 48HJ004-014 standard units are designed to operate in
cooling at outdoor temperatures down to 25 F. With accessory Motormaster
®
I co ntrol (con denser-fan spe ed modula tion), or Motormaster IV control (condenser-fan cycling), units
can operate at outdoor temperatures down to –20 F. The
head pressure controls, which mount in the condenser section, control the condenser-fan motor to maintain correct condensing temperature.
LP CONVERSION KIT
MOTORMASTER
MOT ORMASTER IV
LP convers ion kit a llows the un it to utili ze a liquid p ropane
fuel supply in areas where natural gas is not available. (Kit
shown is for si zes 004-007.)
ITEMOPTION* ACCESSORY†
Energy$Recycler
Apollo Direct Digital Controls
Integrated Economizer (Durablade)
Integrated Economizer (EconoMi$er)
*Indicates a factory-in stalled option (FI OP).
†Indica tes a field-installed accessory.
EconoMi$er with Power Exhaust
Power Exhaust for EconoMi$er
Manual Outdoor-Air Damper
MoistureMiser Dehumidification Package
Convenience Outlet
Unit Mounted Disconnect
High-Static Evaporator Fan Motor and Drive
(004-012 3-Phase Only)
Hinged Panel
Two-Position Damper (25% Open)
Two-PosItion Dam p e r (1 00 % Op en)
Roof Curb (14 in.)
Roof Curb (24 in.)
Thru-the-Bottom Service Connections
Flue-Hood Protector Assembly
Electronic Programmable Thermostat
Thermostat and Subbase
Time G uard
Motormaster
Motormaster IV Head Pressure Control
Accusensor™ II Enthalpy Control
Accusensor III Differential Enthalpy Sensor
Liquid Propane Conversion Kit
Condenser Coil Hail Guard
NO
Flue Discharge Deflector
Coil Guard Grille
Fan/Filter Status Switch
Humidistat
Outdoor-Air Enthalpy Sensor
Return-Air Enthalpy Sensor
Return-Air Temperature Sensor
CO
®
II Control Circuit
®
Head Pressure Control
Reduction Kit
x
Sensor
2
X
X
XX
XX
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12
BURNER SPUDS
(ORIFICES)
Page 13
Time Guard II Control automatically prevents compressor
CONTROLLER
BAROMETRIC
RELIEF DAMPERS
OUTDOOR AIR
TEMPERATURE
SENSOR
GEAR-DRIVEN
DAMPER
ACTUATOR
ECONOMI$ER
PLUG
from r e st artin g for a t l e a st 5 m i nutes af ter a shut d own . Fie l d installed accessory pre-vents short cycling of compressor if
thermostat is rapidly changed. Time Guard II device mounts
in the control compartment of unit. The Time Guard II device
is not requ ired when a Car rier program mable therm ostat is
applied.
TIME GUARD
®
II CONTROL
UNIT MOUNTED DISCONNECT
ECONOMI$ER
Factor y -in stalle d Ec onoMi$er utilize s a microp roc es sor-ba sed control, gear drive damper system, low pressure drop characteristics,
built-in spring retu rn (for close up on power loss), and an integral
barometric dampe r.
NOTE: EconoMi$er is only available for vertical ductwork applications and can be field or factory installed.
ELECTRONIC PROGRAMMABLE THERMOSTAT
Factory-installed, internally-mounted, NEC (National Electrical
Code) and UL (Underwriters’ Laboratories) approved non-fused
switch prov ides unit p ower shutoff with disco nnect lo ckout prote ction capability. The switch is accessible from outside the unit.
CONVENIENCE OUTLET
Factory-installed, inter nally mounted and externally accessible
115-v female receptacle. Includes 15-amp GFI (Ground Fault
Interr up ter) re ce pta c le w ith independen t f us e p r ot ec t io n . Voltag e
required to operate convenience outlet is provided by a factoryinstalled transformer.
Electronic programmable thermostat provides efficient temperature control by allowing you to program heating and cooling setbacks and setups with provisions for weekends and
holi da ys . T he t hermos t at uti l iz es a time de lay betwe en oper at ing mod es. O ptional facto ry-in stalle d Ap ollo di rec t digita l c on trols or a relay pack is also required for thermostat operation.
HAIL GUARD
Conden ser co il ha il gu ard acc ess or y ( field ins tal led) pro tects co ils
against damage fr om hail and other flying debris.
13
Page 14
Options an d a cce ssori es ( con t)
M
IN
IM
U
M
P
O
S
IT
IO
N
O
P
E
N
3
1
T
P
P
1
T
1
4
2
5
S
S
O
D
C
T
R
B
RE
V
.B
198
818A
%
H
U
M
I
D
I
T
Y
9
0
7
0
6
0
3
0
1
0
D
C
B
A
6
0
6
5
7
0
75
5
5
5
0
8
5
80
D
A
M
P
E
R
D
A
M
P
E
R
C
L
O
S
E
D
O
P
E
N
OUTDOOR TEMP
.
°
F
R
E
V
.
9
7
-
3
6
7
2
C
W
–
S
E
T
P
O
I
N
T
S
–
C
C
W
C
O
N
T
A
C
T
S
S
H
O
W
N
IN
H
IG
H
E
N
T
H
A
L
P
Y
R
U
S
H
A
T
2
4
V
A
C
3
m
A
M
I
N
.
A
T
1
1
V
D
C
C
O
N
T
A
C
T
R
A
T
IN
G
S
:
1
.
5
A
R
U
N
,
3
.
5
A
I
N
O
R
U
N
P
O
W
E
R
E
D
S
T
A
T
E
1
2
3
TR
T
R
1
2
4
V
A
C
E
N
T
H
A
L
P
Y
C
O
N
T
R
O
L
+
DURABLADE ECONOMIZER
Exclusive Durablade economizer damper design saves
energy while providing economical and reliable cooling. A
sliding plate on the face of the economizer controls the
amount of outdoor air entering the system. When the sliding
plate is closed, it pr ovides a lea kproof seal w hich prevents
ambient air from seeping in or conditioned air from seeping
out. It can be easily adjusted for 100% outdoor air or any proport ions of mixed air. Equipped with stand ard contro ls and
30% barometric relief capabilities.
ACCUSENSOR™ II ENTHALPY CONTROL
ACCUSENSOR III
DIFFERENTIAL
ENTHALPY
THERMOSTAT
H
C
Zone th ermosta t (24 v) p rovides one- or 2- stage
cooling for control of unit. Matching subbases are
available with or without tamperproof switches
and automatic changeover.
HUMIDISTAT
MOISTUREMISER
Field-installed, wall-mounted humidistat is used to control
operation of the MoistureMiser dehumidification package. The
humid-istat controls the occupied space humidity at a userselect ed setting between 20% and 80% relative humidity.
% RELATIVE HUMIDITY
Accusensor economizer controls help provide efficient, economical
economizer operation. The Accusensor I dry-bulb sensor measures outdoor temperature and is standard with the Durabl ade economizer.
The ac cess or y Ac cus en sor II s ol id-st at e enth al py cont rol sens es bo th
dry an d we t bulb of t he ou tdoor air to pr ov id e an ac curate enthalpy rea ding. Accusensor II is available as a field-installed accessory for the Durablade econom izer.
The accessory Accusensor III differential enthalpy sensor control compares o utdoor tem perature a nd humidity to retur n-air temp erature and
humidity and determines the most economic al mixture of air. Accusensor
III is available for the Durablade economizer only .
APOLLO DIRECT DIGITAL CONTROLS
Apollo direct digital controls are designed exclusively by Carrier,
and are used to actively monitor all modes of operation as well as
evaporator -fan status, filter sta t u s, in do or-air qu ali ty, supp ly -a ir te mperature, and outdoor-air temperature. They are designed to work
with Carr i er T EM P and VVT® system thermostat s.
14
Page 15
MOISTUREMISER DEHUMIDIFICATION PACKAGE
The MoistureMiser dehumidification package is a factory-installed
option th at provides in creased dehum idification by cooling the h ot
liquid refrigerant leaving the condenser coil. The MoistureMiser
package consists of a subcooling coil located on the leaving-air side
of the evaporator coil. The location of this coil in the indoor-air stream
enhanc es th e late nt c apac ity o f the 48HJ u nit s by as mu ch as 40 %.
The MoistureMiser package includes crankcase heater(s) and lowpressure switch(es) and operation can be controlled by a fieldinstalled, wall-mounted humi distat.
CONTROL BOX HINGED PANEL OPTION, 48HJ004-007
UNITS WITH APOLLO CONTROL SHOWN
This is included as a factory-installed option. It permits quick and simple control box access.
COIL GUARD GRILLE
CONTROL BOX HINGED PANEL OPTION,
48HJ008-014 UNITS SHOWN
Coil guard grille protects coils against large objects and vandalism.
15
Page 16
Options an d a cce ssori es ( con t)
COMPRESSOR HINGED PANEL OPTION,
48HJ004-006 UNITS SHOWN
COMPRESSOR HINGED PANEL OPTION,
48HJ008-014 UNITS SHOWN
This is included as a factory-installed option. I t permits quick and simpl e compressor access.
EVAPORATOR-FAN HINGED PANEL OPTION
FILTER HINGED PANEL OPTION
16
This is included as a factory-installed option. It permits quick and simple evaporator-f an access.
This is included as a factory-installed option. It permits tool-less
filter access.
4. On vertical discharge units, ductwork to be attached to accessory roof curb only. For horizontal discharge units, field-supplied flanges should be attached to horizontal discharge openings, and all
ductwork should be attached to the flanges.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Between unit, flue side and combustible surfaces, 48 inches. (18 in. when using accessory flue
discharge deflector.)
b. Bottom of unit to combustible surfaces (when not using curb), 1 inch.
Bottom of base rail to combustible surfaces (when not using curb) 0 inches.
c. Condenser coil, for proper airflow, 36 in. one side, 12 in. the other. The side getting the greater
clearance is optional.
d. Overhead, 60 in. to assure proper condenser fan operation.
e. Between units, control box side, 42 in. per NEC (National Electrical Code).
f. B etween unit and ungrounded surfaces, control box side, 36 in. per NEC.
g. Between unit and block or concrete walls and other grounded surfaces, control box side, 42 in.
per NEC.
h. Horizontal supply and return end, 0 inches.
6. With the exception of the clearance for the condenser coil and combustion side as stated in notes
5a, b and c, a removable fence or barricade requires no clearance.
7. Units may be installed on combustible floors made from wood or Class A, B, or C roof covering
material if set on base rail.
8. The vertical center of gravity is 1′-6″ [457] up from the bottom of the base rail.
17
Page 18
Base unit dimensions — 48 HJ 008 -014
STANDARD
UNIT
UNIT WEIGHT
48HJ
D/E/F008
D/E/F009
D/E/F012
D/E014
A
B
C
D
E
F
G
LbK gLbKgLbKgLbKgLbKgLbKg ft-in. mm ft-in. mm ft-in.mmft-in.mmft-in.mm
48HJD012 & 014, 48HJE014
2″ Dia [51] Power Supply Knockout
DURABLADE
ECONOMIZER WEIGHT
CONNECT ION SIZES
ECONOMI$ER
WEIGHT
CONDUIT SIZE
CORNER
WEIGHT (A)
BOTTOM POWER CHART, THESE HOLES
REQUIRED FOR USE WITH ACCESSORY
PACKAGES — CRBTMPWR001A00 (1/
OR CRBTMPWR002A00 (1/
AND CRBTMPWR004A00 (3/
THREADED
1
″
/
2
3
″
/
4
1
″
/
1
4
1
″
NPT
/
2
3
″
/
NPT
4
CORNER
WEIGHT (B)
WIRE
USE
HOLE SIZES (MAX.)
24 V
Power*1
Power*1
Gas1
Gas1
CORNER
WEIGHT (C)
″
, 11/
2
″
)
4
REQUIRED
7
″
[22.2]
/
8
1
″
[28.4]
/
8
3
″
[44.4]
/
4
1
″
[31.8]
/
4
5
″
[41.3]
/
8
CORNER
WEIGHT (D)
NOTES:
″
, 3/
2
″
)
4
1. Dimensions in [ ] are in millimeters.
″
)
4
2.Center of gravity.
“H”“J”“K”“L”
7
/8632 3-55/161050 2-911/16856 2- 27/16672
7
/8378 3-55/161050 2-911/16856 2- 27/16672
7
/8378 4-15/161253 3-03/8924 2-107/16875
7
/8378 4-15/161253 3-03/8924 2-107/16875
3.Direction of airflow.
4. On vertical discharge units, ductwork to be attached to accessory roof
curb only. For horizontal discharge units, field-supplied flanges should
be attached to horizontal discharge openings, and all ductwork should
be attached to the flanges.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Between unit, flue side and combustible surfaces, 48 inches. (18 in.
when using accessory flue discharge deflector.)
b. Bottom of unit to combustible surfaces (when not using curb),
1 inch.
Bottom of base rail to combustible surfaces (when not using curb)
0 inches.
c. Condenser coil, for proper airflow, 36 in. one side, 12 in. the other.
The side getting the greater clearance is optional.
d. Overhead, 60 in. to assure proper condenser fan operation.
e. Between units, control box side, 42 in. per NEC (National Electrical
Code).
f. Between unit and ungrounded surfaces, control box side, 36 in. per
NEC.
g. Between unit and block or concrete walls and other grounded sur-
faces, control box side, 42 in. per NEC.
h. Horizontal supply and return end, 0 inches.
6. With the exception of the clearance for the condenser coil and combustion side as stated in notes 5a, b and c, a removable fence or barricade
requires no clearance.
7. Units may be installed on combustible floors made from wood or
Class A, B, or C roof covering material if set on base rail.
8. The vertical center of gravity is 1′-7″ [483] for 008 and 009 up from the
bottom of the base rail and 2′-0″ [610] for 012 and 014.
18
Page 19
Accessory di mensi ons — 48 HJ004-0 07
ROOF CURBS
CONNECTION SIZES
CONNECTOR
ACCESSORY
PACKAGE
1′-4
[406]
″
“D” ALT
DRAIN
HOLE
3
1
/
4
UNIT SIZE
48HJ
004-007
*Thru-the-bottom power and control connections and thru-the-curb gas connection.
†Thru-the-bottom gas connection.
“B”“C”
11
1′-9
/
16
[551]
″
″
[45]
“E”
POWER CONTROL
GAS
1
/
2
3
/
4
1
/
2
3
″
NPT
″
NPT 1
″
NPT—— CRBTMPWR003A00†
″
/
4
1
/
4
NPT
″
NPT
1
″
/
NPTCRBTMPWR001A00*
2
1
″
/
NPTCRBTMPWR002A00*
2
UNIT SIZE
48HJ
004-007
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
Vertical discharge unit with Energy$Recycler
required.
IIDetermine fan speed and power requirements
at design conditions.
Before entering the Fan Performance tables, calculate
the total static pressure required based on unit component. From the given and the Economizer Static
Pressure tables on page 48 find:
External static pressure supply0.6 in. wg
External static pressure return0.2 in. wg
Accessory static — None0.0 in. wg
Total Static0.8 in. wg
Enter the Fan Performance table for vertical
discharge, standard motor, 48HJ006 at 0.80 in. wg
and 2000 cfm. The rpm is 1303 and bhp is 1.41.
NOTE: Convert bhp to Fan Heat and Watts using the
formula found in the note following the EvaporatorFan Motor Efficiency table on page 49.
For this example:
Watts = (746 x Bhp)/(motor efficiency)
Watts = (746 x 1.41)/(0.74) = 1421 watts
Indoor Fan Heat = watts x 3.413 Btuh/watt
= 1421 x 3.413 = 4851 Btuh
III Select Energy$Recycler based on outdoor
entering cfm.
Using Energy$Recycler cooling rating tables found in
the Energy$Recycler Product Data choose 62AQ060
unit.
Using 450 cfm outdoor supply airflow, 95 F OD db,
and 75 F OD wb find performance of the 62AQ060
at these conditions:
Energy$Recycler Gross Cooling
Capacity is13,000 Btuh
Energy$Recycler Gross Sensible
Capacity is10,100 Btuh
Compressor power is1.06 kW
Energy$Recycler Leaving db is73 F
Energy$Recycler Leaving wb is66.9 F
IV Using the simplified* method below, calculate
the approximate mixed air temperature for the
SRT evaporator coil.
Using the outdoor air entering cfm, the room cfm and
the room exhaust airflow with their respective db and
wb temperatures determine the db and wb entering
the rooftop evaporator coil.
a) Estimate the mixed air db to the evaporator coil.
t mix db = ((cfm oa x t oa db) + ((cfm ra – cfm exh)
x t rm db)) / ((cfm ao + (cfm ra – cfm exh)))
= ((450 cfm x 73.0 F) + ((2000 cfm – 450 cfm)
x 78 F)) / ((450 cfm + (2000 cfm – 450 cfm)))
= 76.9 F mixed air into the rooftop evaporator
coil
b) Estimate the mixed air wb to the evaporator coil.
t mix wb* = ((cfm oa x t oa wb) + ((cfm ra – cfm
exh) x t rm wb)) / ((cfm oa + (cfm ra – cfm exh)))
= ((450 cfm x 66.9 F) + ((2000 cfm – 450 cfm)
x 65 F)) / ((450 cfm + (2000 cfm – 450 cfm)))
= 65.4 F wb mixed air temperature into the
rooftop evaporator
*Simplified method of determining wet bulb (wb)
temperature of mixture. This approximation is
used because the wb lines in the area of the psychrometric chart in the area used in the calculation is relatively linear, providing a close approximation. A more accurate solution can be found
using the E-Cat program.
LEGEND
cfm —
db —
exh —
mix —
oa —
ra—
sa —
t—
TC —
SHC —
wb —
cubic feet per minute of air
dry bulb
Energy$Recycler discharge
mixture of outdoor + return air
outside air leaving Energy$Recycler
return air
supply air at coil (sa = oa + ra – exh)
temperature
total capa ci ty gross
sensible capaci ty
wet bulb
VDetermine the cooling load requirement for the
rooftop unit.
Required Cooling Capacity is67,000 Btuh
Less Cooling Capacity supplied
by the Energy$Recycler–13,000 Btuh
Rooftop cooling load required is54,000 Btuh
VI Select the rooftop unit based on mixed air
entering conditions and cooling load.
Enter cooling capacity table at outdoor entering temperature 95 F, mixed air entering evaporator at
2000 cfm, 76.9 F db, and 65.4 F wb.
The 48HJ006 will provide a total gross cooling
capacity of 59,420 Btuh and sensible cooling of
43,420 Btuh.
Because these values were not at 80 F entering db,
they were calculated based on the notes following the
Cooling Capacity tables.
NOTE: Unit ratings are gross capacities and do not
include the effect of evaporator-fan motor heat. To
calculate net capacities see Steps VII and VIII.
21
Page 22
Selection pr ocedure (with 48H J006 e xample) (cont)
VII Select net heating capacity of unit to meet
design condition requirements.
Enter the 62AQ060 Heating Rating table found in
the Energy$Recycler Product Data. At 450 cfm, 70 F
and 0° F find the heating value for the Energy$Recycler to be 15.2 Btuh. Since the Energy$Recycler uses
room air, the instantaneous heat is also the Integrated
Heat Rating.
The customer heat requirement is 85,000 Btuh.
Fan heat from Step II4,851 Btuh
Energy$Recycler Heat Capacity15,200 Btuh
add Energy$Recycler optional
supply fan heat if supplied+0 Btuh
Total Unit heat with Energy$Recycler20,051 Btuh
Determine additional electric heat capacity in kW.
The required heating capacity is 85,000 Btuh. There-
fore, 64,949 Btuh (85,000-20,051) additional heat is
required.
The output capacity for the 48HJE006 is 92,000
Btuh, which is sufficient.
Total unit net heating capacity is 112,571 Btuh
(92,000 + 20,571).
VIII Determine net cooling capacity.
Cooling capacities are gross capacities and
do not include indoor (evaporator) or optional
Energy$Recycler supply fan heat.
Determine net cooling capacity using the following
formula:
Net Capacity = (Gross Capacity Rooftop Unit
+ Gross Capacity Energy$Recycler) – (IFM Heat
+ Optional Energy$Recycler Supply Fan motor heat)
Gross Total Cooling
Rooftop unit59,420 Btuh
Energy$Recycler 13,000 Btuh
Total72,420 Btuh
Less
IFM heat (from Step II)–4,851 Btuh
Optional Energy$Recycler Supply
Fan Motor Heatnone
Indoor fan motor from Step II** . . . . 1,421 watts
Outdoor fan motor from Physical Data table
1
find
/4 hp**.
Assume OD motor efficiency is 0.75.
Watts = (746 x hp)/(motor Eff)
= (746 x
1
/4)/(0.75)
= 249 watts
**Dual circuit units will have two indoor and two
outdoor fans, double values.
b) Energy$Recycler:
Compressor watts from
Energy$Recycler Product Data 1,060 watts
Optional supply fan from
Energy$Recycler Product Data
fan curvesnone
Exhaust fan, from Energy$Recycler
Product Data fan curve
at 450 cfm, 0.2 in. wg Static110 watts
Total watts for the unit in operation
at design conditions7,200 watts
XElectrical data RLA, FLA, LRA, MCA and
MOCP.
Separate Power Supply:
If the 62AQ is wired for separate power see the Electrical Data table.
Single Power Supply with Unit:
The unit is 230-1-60 Hz. Look up the 48JH006
without convenience outlet in the Electrical Data
Table. Find unit electrical data. For the rooftop unit
the data is MCA = 46.3 amps, MOCP = 60 amps,
Min Unit Disconnect Size FLA = 45, and LRA = 216.
From the Table of “X” and “Y” values in the Energy$Recycler Product Data literature, find 230 v, for
62AQ060300, “X” = 8.1 amps and “Y” = 9.3 amps.
Add “X” amps to the MCA and MOCP and add “Y”
amps to the minimum disconnect size.
**The calculated MOCP is 68.1 amps; it is rounded
down to 60 amps. Compare it to MCA; it must be
larger than the MCA of 54.4 amps, so it is acceptable
as is.
22
Page 23
The wiring of the unit must be suitable for the MCA
calculated above, and the Maximum Overcurrent Protection (MOCP) device must be selected to meet the
calculated MOCP.
If the overcurrent protective device for the combination load is equal to or less than 60 amps, a single disconnect may be used for BOTH the main unit and the
62AQ provided that the wire ampacity supplying the
62AQ is sized for a minimum of 33% larger than the
overcurrent protection device value (i.e., 60 amps
x 0.33 = 20 amps), no further subfusing would be
required.
If the overcurrent protection device is greater than
60 amps and the old overcurrent protection device
was less than 60 amps, a FUSED disconnect no
greater than 60 amps must be provided for the main
unit and a SEPARATE FUSED disconnect must be
provided for the 62AQ unit.
If the old overcurrent protection device is greater than
60 amps, a disconnect is required for the MAIN UNIT
as well as a FUSED DISCONNECT for the 62AQ
unit.
23
Page 24
Perf ormance data
48HJ00 4 ( 3 TONS )
Temp ( F)
Air Ent
Condenser
(Edb)
TC
75
SHC
kW
TC
85
SHC
kW
TC
95
SHC
kW
TC
105
SHC
kW
TC
115
SHC
kW
TC
125
SHC
kW
48HJ00 5 ( 4 TONS )
Temp (F)
Air Ent
Condenser
(Edb)
TC
75
SHC
kW
TC
85
SHC
kW
TC
95
SHC
kW
TC
105
SHC
kW
TC
115
SHC
kW
TC
125
SHC
kW
Standard Ratings
BF—
Edb —
Ewb —
kW—
SHC —
TC—
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacit y (1000 Btuh) Gross
48HJ004 (3 TONS) — HIGH-STATIC MOTOR (BELT DRIVE) (cont)
Airflow
(Cfm)
900
1000
1100
1200
1300
1400
1500
LEGEND
Bhp —
FIOP —
NOTES:
1.
2. Motor drive range is 760 to 1090 rpm for standard motor; 1075 to 1455 rpm
3. Values include losses for filters, unit casing, and wet coils. See page 49 for
Brake Horsepower Input to Fan
Factory-Installed Option
Boldface
indicates field-supplied drive required. (See Note 2.)
for high-static motor. All other rpms require a field-supplied drive.
accessory/FIOP static pressure information.
4. Maximum continuous bhp is 1.2 for standard motor, 2.4 for high-static motor.
Extensive motor and electr ical testing on these units ensu res that the full
range of the motor can be utilized with confidence. Using your fan motors up
to the ratings shown will not r esult in nuisanc e trippi ng or prematu re motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
5. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
6. Interpolation is permissible. Do not extrapolate.
5. Maximum continuous bhp is 1.2 for standard motor, 2.4 for high-static motor.
Extensive motor and electr ical testing on these units ensu res that the full
range of the motor can be utilized with confidence. Using your fan motors up
to the ratings shown will not r esult in nuisanc e trippi ng or prematu re motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
11321.1412021.32
14632.19
14892.36
11411.09
14822.22
——
——
33
Page 34
Perf ormance data (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
48HJ006 (5 TONS) — STANDARD MOTOR (BELT DRIVE) — SINGLE-PHASE UNITS
4. Values include losses for filters, unit casing, and wet coils. See page 49 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 1.30 for single-phase standar d motors, 2.40 for
3-phase standard motors, and 2.90 for high- static motors. Extensive motor
and electrical tes ting o n these uni ts ensure s that the full range of the motor
can be utilized with confidence. Using your fan motors up to the ratings
shown will not result i n nuisance tripping o r premature motor failure. Unit
warranty will not be affected. See Evaporator-Fan Motor Data tables on
pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
5. Maximum continuous bhp is 2.40 for standard motors, 2.90 for high-static
motors. Extensive motor and electrical tes ting on these uni ts ensures that
the full range of the moto r can be utili zed with confidence. Using your fan
motors up to the ratings shown will not result in nuisanc e trippi ng or pr emature motor failure. Unit warranty will no t be affected. See Evaporator-Fan
Motor Data tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
4. Values include losses for filters, unit casing, and wet coils. See page 49 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 2.90 for standard motors, 4.20 for high-static
motors. Extensive motor and electrical tes ting on these uni ts ensures that
the full range of the moto r can be utili zed with confidence. Using your fan
motors up to the ratings shown will not result in nuisanc e trippi ng or pr emature motor failure. Unit warranty will no t be affected. See Evaporator-Fan
Motor Data tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
9092.879563.22
10864.3011274.80
11004.4911415.02
9042.61
10844.01
10974.20
11094.39
36
Page 37
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
48HJ009 (8
Airflow
Bhp—
FIOP —
NOTES:
1.
2.indicates field-supplied motor and drive required.
3. Motor drive range is 840 to 1085 rpm for standard motors; 860 to 1080 rpm
4. Values include losses for filters, unit casing, and wet coils. See page 49 for
5. Maximum continuous bhp is 2.90 for standard motors, 4.20 for high-static
motors. Extensive motor and electrical tes ting on these uni ts ensures that
the full range of the moto r can be utili zed with confidence. Using your fan
motors up to the ratings shown will not result in nuisanc e trippi ng or pr emature motor failure. Unit warranty will no t be affected. See Evaporator-Fan
Motor Data tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
5. Maximum continuous bhp is 2.90 for standard motors, 4.20 for high-static
motors. Extensive motor and electrical tes ting on these uni ts ensures that
the full range of the moto r can be utili zed with confidence. Using your fan
motors up to the ratings shown will not result in nuisanc e trippi ng or pr emature motor failure. Unit warranty will no t be affected. See Evaporator-Fan
Motor Data tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
10714.3510944.63
10814.42
38
Page 39
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
48HJ012 (10 TONS) — STANDARD AND HIGH-STATIC MOTOR (BELT DRIVE)
5. Maximum continuous bhp is 3.70 for standard motors, 5.25 for high-static
motors. Extensive motor and electrical tes ting on these uni ts ensures that
the full range of the moto r can be utili zed with confidence. Using your fan
motors up to the ratings shown will not result in nuisanc e trippi ng or pr emature motor failure. Unit warranty will no t be affected. See Evaporator-Fan
Motor Data tables on pages 47 and 48 for additional information.
6. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
7. Interpolation is permissible. Do not extrapolate.
4. Maximum continuous bhp is 5.25 for standar d motor. Exten sive motor an d
electrical testi ng on these uni ts ensure s that the full range o f the m otor can
be utilized with c onfidence. Us ing your fan motors up to the ratings shown
will not result in nuisance trippi ng or premature motor failure. Unit warranty
will not be affected. See Evaporator-Fan Motor Data table on page 47 for
additional information.
5. Use of a fiel d-supplied motor may affect wire sizing. Co ntact your Carrier
representative to verify.
6. Interpolation is permissible. Do not extrapolate.
48HJ004 (3 TONS) — HIGH-STATIC MOTOR (BELT DRIVE) (cont)
Airflow
(Cfm)
900
1000
1100
1200
1300
1400
1500
LEGEND
Bhp —
FIOP —
NOTES:
1.
2. Motor dri ve range i s 760 to 1090 r pm for standard motors; 1075 to 145 5 rp m
3. Values include losses for filters, unit c asing, and wet coils. Se e page 49 for
Brake Horsepower Input to Fan
Factory-Installed Option
Boldface
indicates field-supplied drive required. (See Note 3.)
for high-static motors. All other rpms require a field-supplied drive.
accessory/FIOP static pressure information.
4. Maximum c ontinuous bhp is 1 .20 for standard motors; 2.4 0 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
6. Interpolation is permissible. Do not extrapolate.
14611.1114921.18
40
Page 41
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
5. Maximum c ontinuous bhp is 1 .20 for standard motors; 2.4 0 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
7. Interpolation is permissible. Do not extrapolate.
14662.27
14712.18
14932.36
15.212.54
41
Page 42
Perf ormance data (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
48HJ006 (5 TONS) — STANDARD MOTOR (BELT DRIVE) — SINGLE PHASE UNITS
2. indicates field-supplied motor and drive required.
3. Motor drive range is 1020 to 1460 rpm for single-phase sta ndard units, 1120
to 1585 for 3-phase standard uni ts, and 1 300 to 16 85 for high-stati c units. All
other rpms require a field-supplied drive.
4. Values include losses for filters, unit c asing, and wet coils. Se e page 49 for
accessory/FIOP static pressure information.
5. Maximum co ntinuous bhp is 1.30 for single-phas e standard units, 2.40 for
6. Use of a field-supplied motor may affect wire sizing. Contact your Carrier rep-
7. Interpolation is permissible. Do not extrapolate.
11821.0412511.2013101.4013851.49
15852.4216382.60
13271.66
13301.7813921.97
13651.9414262.15
16573.0717103.38
3-phase standar d motors, and 2.90 for high-static motors. Ext ensive motor
and electrical testing on these units ensures that the full range of the motor
can be utilized with confidence. Using your fan motors up to the ratings shown
will not resul t in nuisance tr ipping or premature mo tor failure. Unit warranty
will not be a ffected. See Evaporat or-Fan Motor Data tables on pages 4 7 an d
48 for additional information.
resentative to verify.
13591.80
16452.98
16763.17
16042.42
42
Page 43
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
5. Maximum continuous bhp is 2.4 for standard motors; 2.9 for high-static
6. Use of a field-supplied motor may affect wire sizing. Contact your Carrier rep-
7. Interpolation is permissible. Do not extrapolate.
15362.4615842.6116462.8317062.97
16772.99 17393.33 1795 3.67——
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
resentative to verify.
17062.97 17613.27——
16162.6316712.80
1691 2.86
1726 3.09 17753.35
16042.42
17042.90
17403.12
43
Page 44
Perf ormance data (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
5. Maximum continuous bhp is 2.9 for standard motors; 4.2 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
7. Interpolation is permissible. Do not extrapolate.
5. Maximum conti nuous bhp is 3.70 for standard moto rs and 5.25 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor ca n be utili zed with con fidence. Us ing your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 47 and 48 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
7. Interpolation is permissible. Do not extrapolate.
4. Maximum continuous bhp is 5.25 for the standard motor. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisanc e tripping or premature m otor failure. Unit warranty will n ot
be affected. See Evap orator-Fan Motor Data table on page 47 for additional
information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
6. Interpolation is permissible. Do not extrapolate.
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range of the
motors can be utilized with confidence. Using your fan motors up to the ratings shown in this table will not
result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
UNIT
PHASE
MAXIMUM
CONTINUOUS BHP*
MAXIMUM
OPERATING WATTS*
UNIT VOLTAGE
Single1.201000208/2305.4
Three1.201000
Single1.201000208/2305.4
Three1.201000
Single1.301650208/2309.7
Three2.402120
Three2.402120
Three2.902615
Three3.703775
Three5.254400
MAXIMUM
AMP DRAW
208/2305.4
4602.4
5752.4
208/2305.4
4602.4
5752.4
208/2306.4
4602.9
5752.9
208/2306.4
4602.9
5752.9
208/2307.9
4603.6
5753.6
208/23012.6
4605.7
5755.7
208/23015.0
4607.4
5757.4
47
Page 48
Perf ormance data (cont)
EVAPORATOR-FAN MOTOR DATA — HIGH-STATIC MOTORS
UNIT
48HJ
004
005
006
007
008,009
012
LEGEND
Bhp —
Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range of the
motors can be utilized with confidence. Using your fan motors up to the ratings shown in this table will not
result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
UNIT
PHASE
Three2.402120
Three2.402120
Three2.902615
Three2.902615
Three4.203775
Three5.254400
MAXIMUM
CONTINUOUS BHP*
MAXIMUM
OPERATING WATTS*
UNIT VOLTAGE
MAXIMUM
AMP DRAW
208/2306.4
4602.9
5752.9
208/2306.4
4602.9
5752.9
208/2307.9
4603.6
5753.6
208/2306.4
4603.6
5753.6
208/23012.6
4605.7
5755.7
208/23015.0
4607.4
5757.4
UNIT
48HJ
004,005
006,007
008,009
012
014
ARI —
Bels —
UNIT
Durablade
EconoMi$er
UNIT
Durablade
EconoMi$er
OUTDOOR SOUND POWER (TOTAL UNIT)
ARI
RATING
(Bels)
7.655.966.064.066.268.464.561.757.3
8.059.168.968.771.974.068.965.759.0
8.262.269.371.574.776.272.968.761.5
8.464.671.173.376.977.673.770.663.7
8.663.769.972.578.281.177.373.366.8
Air Conditioning and Refrigeration Institute
Sound Levels (1 bel = 10 decibels)
*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, the input rate should be reduced at higher altitudes.
†Orifices are available through your local Carrier distributor.
*Derating of the unit is not required unless the heating value of the gas
exceeds the values listed i n the table above, or if the elevation exceeds
6000 ft. Derating conditions must be 4% per thousand ft above sea level.
For example, at 4000 ft, i f t he heati ng value of the gas exceeds 1 000 Btu/
ft3, the unit will require a 16% der ating. For elevations above 6000 ft, the
same formula applies. For example, at 7000 ft, th e unit will require a 28 %
derating of the maximum heating value per the National Fuel Gas Code.
Full Load Amp s
Heating, Air Conditioning and Refriger ation
Indoor ( Evaporator ) Fan Mo to r
Locked Rotor Amps
Minim um Circuit Amps
Maximum O vercurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Labo ratories
1. In complianc e w ith N EC req ui reme nt s fo r mul timo t or and comb ina-
2. Electrical data based on 95 F ambient outdoor-air temperature
COMBUSTION
IFM
FAN MOTOR
tion lo ad equipment (ref er to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR
breaker. The UL, Canada units may be fuse or circuit breaker.
± 10% voltage.
POWER
SUPPLY
MINIMUM UNIT
DISCONNECT
SIZE*
51
Page 52
Electrical data (cont)
STANDARD MOTOR UNITS WITH ELECTRICAL CONVENIENCE OUTLET
Full Load Amp s
Heating, Air Conditioning and Refriger ation
Indoor ( Evaporator ) Fan Mo to r
Locked Rotor Amps
Minim um Circuit Amps
Maximum O vercurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Labo ratories
1. In complianc e w ith N EC req ui reme nt s fo r mul timo t or and comb ination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR
breaker. The UL, Canada units may be fuse or circuit breaker.
2. Electrical data based on 95 F ambient outdoor-air temperature
± 10% voltage.
COMBUSTION
FAN MOTOR
POWER
SUPPLY
WITH OUTLET
MINIMUM UNIT
DISCONNECT
SIZE*
52
Page 53
HIGH-STATIC MOTOR UNITS WITHOUT ELECTRICAL CONVENIENCE OUTLET
Full Load Amp s
Heating, Air Conditioning and Refriger ation
Indoor ( Evaporator ) Fan Mo to r
Locked Rotor Amps
Minim um Circuit Amps
Maximum O vercurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Labo ratories
1. In complianc e w ith N EC req ui reme nt s fo r mul timo t or and comb ina-
tion lo ad equipment (ref er to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR
breaker. The UL, Canada units may be fuse or circuit breaker.
2. Electrical data based on 95 F ambient outdoor-air temperature
± 10% voltage.
COMBUSTION
FAN MOTOR
POWER
SUPPLY
MINIMUM UNIT
DISCONNECT
SIZE*
53
Page 54
Electrical data (cont)
HIGH-STATIC MOTOR UNITS WITH ELECTRICAL CONVENIENCE OUTLET
Full Load Amp s
Heating, Air Conditioning and Refriger ation
Indoor ( Evaporator ) Fan Mo to r
Locked Rotor Amps
Minim um Circuit Amps
Maximum O vercurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Labo ratories
1. In complianc e w ith N EC req ui reme nt s fo r mul timo t or and comb ination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR
breaker. The UL, Canada units may be fuse or circuit breaker.
2. Electrical data based on 95 F ambient outdoor-air temperature
± 10% voltage.
COMBUSTION
FAN MOTOR
POWER
SUPPLY
MINIMUM UNIT
DISCONNECT
SIZE*
54
Page 55
Typical piping and wiring
UNITS WITH MOISTUREMISER OPTION
55
Page 56
Typical piping and wiring (cont)
VERTICAL DISCHARGE
HORIZONTAL DISCHARGE
56
Page 57
Controls
Operating sequence for 48HJ004-007 units
Cooling, units without economizer —
stat calls for cooling, terminals G and Y1 and the compressor contactor (C) are energized. The indoor (evaporator)
fan motor (IFM), compressor, and outdoor (condenser) fan
motor (OFM) start. The OFM runs continuously while the
unit is in cooling. When the thermostat is satisfied, C is
deenergized and the compressor and OFM shut off. After a
30-second delay, the IFM shuts off. If the thermostat fan
selector switch is in the ON position, the evaporator motor
will run continuously.
Cooling, units with Durablade economizer —
the outdoor-air temperature is above the outdoor-air temperature (OAT) setting and the room thermostat calls for
cooling, the compressor contactor is energized to start the
compressor and outdoor (condenser) fan motor (OFM).
The indoor (evaporator) fan motor (IFM) is energized and
the economizer damper moves to the minimum position.
After the thermostat is satisfied, the damper moves to the
fully closed position when IFM is deenergized.
When the outdoor-air temperature is below the OAT setting and the thermostat calls for Y1 and G, the economizer
damper moves to the minimum position when the evaporator fan starts. The first stage of cooling is provided by the
economizer. If the supply-air temperature is above 57 F, a
switch on the supply-air thermostat is closed between the
T2 terminal and the 24 vac terminal. This causes the
damper to continue to modulate open until the supply-air
temperature falls below 55 F or the damper reaches the
fully-open position.
When the supply-air temperature is between 55 F and
52 F, the supply-air thermostat has open switches between
the T2 and 24 vac terminals and between the T1 and
24 vac terminals. This causes the economizer damper to
remain in an intermediate open position.
If the supply-air temperature falls below 52 F, a switch
on the supply-air thermostat is closed between the T1 terminal and the 24 vac terminal. This causes the damper to
modulate closed until the supply-air temperature rises
above 55 F or the damper reaches the minimum position.
When the supply-air temperature is between 55 F and
57 F, the supply-air thermostat has open switches between
the T2 and 24 vac terminals. This causes the economizer
damper to remain in an intermediate open position.
If the outdoor air alone cannot satisfy the cooling requirements of the conditioned space, economizer cooling
is integrated with mechanical cooling, providing second
stage cooling. The compressor and condenser fan will be
energized and the position of the economizer damper will
be determined by the supply-air temperature.
When the second stage of cooling is satisfied, the compressor and condenser-fan motor will be deenergized. The
damper position will be determined by the supply-air
temperature.
When the first stage of cooling is satisfied, the IFM shuts
off after a 30-second delay. The damper then moves to
fully closed position.
When thermo-
When
Cooling, units with EconoMi$er
When the outdoor-air temperature (OAT) is above the
ECON SP set point and the room thermostat calls for
Stage 1 cooling (R to G + Y1), the indoor (evaporator) fan
motor (IFM) is energized and the EconoMi$er damper
modulates to minimum position. The compressor contactor is energized to start the compressor and outdoor (condenser) fan motor (OFM). After the thermostat is satisfied,
the damper modulates to the fully closed position when the
IFM is deenergized.
When the OAT is below the ECON SP setting and the
room thermostat calls for Stage 1 cooling (R to G + Y1),
the EconoMi$er modulates to the minimum position when
the IFM is energized. The EconoMi$er provides Stage 1 of
cooling by modulating the return and outdoor-air dampers
to maintain a 55 F supply air set point. If the supply-air
temperature (SAT) is greater than 57 F, the EconoMi$er
modulates open, allowing a greater amount of outdoor air
to enter the unit. If the SAT drops below 53 F, the outdoor
air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the
EconoMi$er maintains its position.
If outdoor-air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the
MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanical cooling. This is accomplished by the strategies below.
NOTE: Compressor has a two minute Minimum On, Minimum Off, and Interstage delay timer.
1. If Y1 is energized, and the room thermostat calls for
Y2 (2-stage) thermostat), the compressor and OFM
are energized. The position of the EconoMi$er
damper is maintained at its current value.
2. If Y1 is energized for more than 20 minutes, and Y2
is not energized (whether or not a 2-stage thermostat
is used), the compressor and OFM are energized. The
position of the EconoMi$er damper is maintained at
its current value.
3. If Y1 is energized, and the compressor is already
energized (see Step 2) and the room thermostat calls
for Y2, the compressor continues to operate.
4. If the compressor is energized and the thermostat is
satisfied, the compressor, OFM, and IFM are deenergized and the EconoMi$er modulates closed.
When the OAT is below the MECH CLG LOCKOUT set
point, the compressors remain off.
Heating, units without economizer —
mostat calls for heating, terminal W1 is energized. The
induced-draft motor is energized and the burner ignition
sequence begins. The indoor (evaporator) fan motor (IFM)
is energized 45 seconds after a flame is ignited. On units
equipped for two stages of heat, when additional heat is
needed, W2 is energized and the high-fire solenoid on the
main gas valve (MGV) is energized. When the thermostat is
satisfied and W1 is deenergized, the IFM stops after a
45-second time-off delay.
When the ther-
57
Page 58
Controls ( c on t )
Heating, units with economizer/two-position
damper —
nal W1 is energized. The induced-draft motor is energized
and the burner ignition sequence begins. The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a
flame is ignited and the damper moves to the minimum position. If the accessory two-position damper is used, the
outdoor-air damper opens to the minimum position whenever the evaporator fan runs. On units equipped for two
stages of heat, when additional heat is needed, W2 is energized and the high-fire solenoid on the main gas valve
(MGV) is energized. When the thermostat is satisfied and
W1 is deenergized, the IFM stops after a 45-second timeoff delay. The economizer damper then moves to the fully
closed position. When using continuous fan, the damper
will remain in the minimum position.
When the thermostat calls for heating, termi-
Operating sequence for 48HJ008-014 units
Cooling, units without economizer —
stat calls for cooling, terminals G and Y1 are energized.
The indoor (evaporator) fan contactor (IFC) and compressor contactor no. 1 (C1) are energized, and evaporator-fan
motor, compressor no. 1, and condenser fans start. The
condenser-fan motors run continuously while unit is cooling. For units with 2 stages of cooling, if the thermostat
calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is energized and compressor
no. 2 starts.
When the thermostat is satisfied, C1 and C2 are deenergized and the compressors and outdoor (condenser) fan
motors (OFM) shut off. After a 30-second delay, the indoor
(evaporator) fan motor (IFM) shuts off. If the thermostat fan
selector switch is in the ON position, the evaporator motors will run continuously.
Cooling, units with Durablade economizer —
the outdoor-air temperature is above the OAT setting and
the room thermostat calls for cooling, the compressor contactor no. 1 is energized to start compressor no. 1 and outdoor (condenser) fan motors (OFM). The indoor (evaporator) fan motor (IFM) is energized and the economizer
damper moves to the minimum position. Upon a further
call for cooling, compressor contactor no. 2 will be energized, starting compressor no. 2. After the thermostat is
satisfied and the IFM is deenergized, the damper moves to
the fully closed position.
When the outdoor-air temperature is below the OAT setting and the thermostat calls for Y1 and G, the economizer
damper moves to the minimum position when the evaporator fan starts. The first stage of cooling is provided by the
economizer. If the supply-air temperature is above 57 F, a
switch on the supply-air thermostat is closed between the
T2 terminal and the 24 vac terminal. This causes the
damper to continue to modulate open until the supply-air
temperature falls below 55 F or the damper reaches the
fully open position.
When the supply-air temperature is between 55 F and
52 F, the supply-air thermostat has open switches between
the T2 and 24 vac terminals and between the T1 and
24 vac terminals. This causes the economizer damper to
remain in an intermediate open position.
When thermo-
When
If the supply-air temperature falls below 52 F, a switch
on the supply-air thermostat is closed between the T1 terminal and the 24 vac terminal. This causes the damper to
modulate closed until the supply-air temperature rises
above 55 F or the damper reaches the minimum position.
When the supply-air temperature is between 55 F and
57 F, the supply-air thermostat has open switches between
the T2 and 24 vac terminals. This causes the economizer
damper to remain in an intermediate open position.
If the outdoor air alone cannot satisfy the cooling requirements of the conditioned space, economizer cooling
is integrated with mechanical cooling, providing second
stage cooling. Compressor no. 1 and condenser fan will be
energized, and the position of the economizer damper will
be determined by the supply-air temperature. Compressor
no. 2 is locked out.
When the second stage of cooling is satisfied, the compressor and condenser fan motors will be deenergized.
The damper position will be determined by the supply-air
temperature.
When the first stage of cooling is satisfied, the IFM shuts
off after a 30-second delay. The damper then moves to fully closed position.
Cooling, units with EconoMi$er
When the outdoor-air temperature (OAT) is above the
ECON SP set point and the room thermostat calls for
Stage 1 cooling (R to G + Y1), the indoor (evaporator) fan
motor (IFM) is energized and the EconoMi$er damper
modulates to minimum position. The compressor contactor is energized to start the compressor and outdoor (condenser) fan motor (OFM). After the thermostat is satisfied,
the damper modulates to the fully closed position when the
IFM is deenergized.
When the OAT is below the ECON SP setting and the
room thermostat calls for Stage 1 cooling (R to G + Y1),
the EconoMi$er modulates to the minimum position when
the IFM is energized. The EconoMi$er provides Stage 1 of
cooling by modulating the return and outdoor-air dampers
to maintain a 55 F supply air set point. If the supply-air
temperature (SAT) is greater than 57 F, the EconoMi$er
modulates open, allowing a greater amount of outdoor air
to enter the unit. If the SAT drops below 53 F, the outdoor
air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the
EconoMi$er maintains its position.
If outdoor-air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the
MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanical cooling. This is accomplished by the strategies below.
NOTE: Compressor has a two minute Minimum On, Minimum Off, and Interstage delay timer.
1. If Y1 is energized, and the room thermostat calls for
Y2 (2-stage thermostat), compressor no. 1 and OFM
are energized. The position of the EconoMi$er
damper is maintained at its current value.
2. If Y1 is energized for more than 20 minutes, and Y2
is not energized (whether or not a 2-stage thermostat
is used), compressor no. 1 and OFM are energized.
58
Page 59
The position of the EconoMi$er damper is maintained at its current value.
3. If Y1 is energized, and compressor no. 1 is already
energized (see Step 2) and the room thermostat calls
for Y2, compressor no. 1 continues to operate. If Y2
remains energized for more than 20 minutes, compressor no. 2 is energized.
NOTE: Compressor no. 2 cannot be energized unless
there is a signal for Y2 from the space thermostat.
4. If compressor no. 2 is energized, and the Y2 signal
from the thermostat is satisfied, compressor no. 1
and 2 are deenergized. Reasserting Y2 will start compressor no. 1 and (after a 20-minute interstage delay)
compressor 2.
5. If compressor no. 1 is energized and the thermostat is
satisfied, compressor no. 1, the OFM, and IFM are
deenergized and the EconoMi$er modulates closed.
When the OAT is below the MECH CLG LOCKOUT set
point, the compressors remain off.
Heating, units without economizer —
mostat calls for heating, terminal W1 is energized. In order
to prevent thermostat short-cycling, the unit is locked into
the Heating mode for at least 1 minute when W1 is energized. The induced-draft motor (IDM) is then energized and
the burner ignition sequence begins. The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a flame
is ignited. When additional heat is needed, W2 is energized
and the high-fire solenoid on the main gas valve (MGV) is
energized. When the thermostat is satisfied and W1 and
W2 are deenergized, the IFM stops after a 45-second timeoff delay.
Heating, units with economizer/two-position
damper —
nal W1 is energized. In order to prevent thermostat shortcycling, the unit is locked into the Heating mode for at
least 1 minute when W1 is energized. The induced-draft
motor is then energized and the burner ignition sequence
begins. The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a flame is ignited and the damper
moves to the minimum position. If the accessory twoposition damper is used, the outdoor-air damper opens to
the minimum position whenever the evaporator fan runs.
When additional heat is needed, W2 is energized and the
high-fire solenoid on the main gas valve (MGV) is energized. When the thermostat is satisfied and W1 and W2
are deenergized, the IFM stops after a 45-second time-off
delay. The economizer damper then moves to the fully
closed position. When using continuous fan, the damper
will remain in the minimum position.
When the thermostat calls for heating, termi-
When the ther-
Operating sequence — Units with
MoistureMiser dehumidification package
When thermostat calls for cooling, terminals G and Y1
and/or Y2 and the compressor contactor(s) C1 (and C2)
are energized. The indoor (evaporator) fan motor (IFM),
compressor(s), and outdoor (condenser) fan motor(s) (OFM)
start. The OFM(s) runs continuously while the unit is in
cooling. As shipped from the factory, MoistureMiser dehumidification circuit is always energized. If MoistureMiser
circuit modulation is desired, a field-installed, wall-mounted
humidistat is required.
If the MoistureMiser humidistat is installed and calls for
the MoistureMiser subcooler coil to operate, the humidistat
internal switch closes. This energizes and closes the liquid
line solenoid valve coil(s) (LLSV) of the MoistureMiser circuit, forcing the hot liquid refrigerant of the liquid line to
enter the subcooler coil (see Typical Piping and Wiring section on page 55). As the hot liquid passes through the subcooler coil, it is exposed to the cold supply airflow coming
off from the evaporator coil and the liquid is further cooled
to a temperature approaching the evaporator coil leavingair temperature. The state of the refrigerant leaving the
subcooler coil is a highly subcooled liquid refrigerant. The
liquid then enters a thermostatic expansion valve (TXV)
where the liquid is dropped to a lower pressure. The TXV
does not have a pressure drop great enough to change the
liquid to a 2-phase fluid. The TXV can throttle the pressure
drop of the liquid refrigerant and maintain proper conditions at the compressor suction valve over a wide range of
operating conditions. The liquid then enters a second fixed
restrictor expansion device for a second pressure drop to a
2-phase fluid. The liquid proceeds to the evaporator coil at
a temperature lower than normal cooling operation. This
lower temperature is what increases the latent capacity of
the rooftop. The 2-phase refrigerant passes through the
evaporator and is changed into a vapor. The air passing
over the evaporator coil will become colder than during
normal operation as a result of the colder refrigerant temperatures. However, as it passes over the subcooler coil,
the air will be warmed slightly.
As the refrigerant leaves the evaporator, the refrigerant
passes a low-pressure switch in the suction line. This lowpressure switch will de-activate the MoistureMiser package
when the suction pressure reaches 60 psig. The low-pressure switch is an added safety device to protect against
evaporator coil freeze-up. The low-pressure switch will
only de-activate and open the liquid line solenoid valve in
the MoistureMiser circuit. The compressors will continue to
run as long as there is a call for cooling, regardless of the
position of the low-pressure switch. The solenoid valve and
the MoistureMiser package will be re-activated only when
the call for cooling has been satisfied, the low-pressure
switch has closed, and a new call for cooling exists. The
crankcase heaters on the scroll compressors provide additional protection for the compressors due to the additional
refrigerant charge in the subcooler.
When the humidistat is satisfied, the humidistat internal
switch opens, cutting power to and opening the LLSV.
The refrigerant is routed back through the evaporator and
the subcooler coil is removed from the refrigerant loop.
When the thermostat is satisfied, C1 (and C2) is deenergized and the compressor(s) and OFM(s) shut off. After a
30-second delay, the IFM shuts off. If the thermostat
fan selector switch is in the ON position, the IFM will run
continuously.
59
Page 60
Controls ( c on t )
TEMP systems
A TEMP System is a network of communicating Carrier
TEMP System Thermostats and rooftop, factory-mounted
Apollo direct digital controls, each serving its own zone
and heating/cooling unit. Networking allows your building
manager to easily access each of your systems from a single location...whether they are in the same building or located throughout town.
The TEMP System’s inherently flexible, modular base
design supports the exact number of independent,
single zone systems you require...no more, no less, no
compromises.
Ideal for department stores, small office buildings, fast
food chains, schools and hotels, a TEMP System is a
cost-effective way to maintain comfortable building environments. See Typical TEMP System on page 62.
Variable Volume/Variable Temperature VVT®
systems
VVT Systems are dedicated to total building comfort.
Carrier thermostats, zone dampers, and HVAC equipment
with factory-mounted direct digital controls continually
monitor and adjust their operation to ensure uninterrupted
and personalized comfort for all occupants.
Through the use of communicating electronic controls,
VVT Systems are able to provide the comfort of a multiple
zone system while using the installation, operation, and
maintenance economics of single zone equipment...virtually putting an end to the cost vs. comfort compromise. See
Typical VVT System on page 62.
Contactor (Compressor)
Crankcase Heater
Compressor
Fuse
Humidistat
Indoor ( Evaporator) Fan Motor
Liquid Line Solenoid Valve
Low-Pressure Switch (Subcooler Onl y )
Transformer
Factory Wiring
Accessory or O ptional Wiring
Contactor (Compressor)
Crankcase Heater
Compressor
Fuse
Humidistat
Indoor (Evaporator) Fan Motor
Liquid Line Solenoid Valve
Low-Pressure Switch (Subcooler Only)
Transformer
Factory Wiring
Acces s ory or Optional Wiring
(48HJ008-014), 208/230-V UNIT SHOWN)
61
Page 62
Controls ( c on t )
TEMP SYSTEM THERMOSTAT (WITH TIMECLOCK)TEMP SYSTEM THERMOSTAT (WITHOUT TIMECLOCK)
TYPICAL TEMP SYSTEM
MONITOR
THERMOSTAT
WITH
TIMECLOCK
ZONE
CONTROLLER
VVT —
Variable Volume/Variable Temperature
ZONE
DAMPER
TYPICAL VTT® SYSTEM
ROOFTOP UNIT
WITH APOLLO
COMMUNICATING
CONTROL
SUPPLY
BYPASS
DAMPER
BYPASS
AIRFLOW
ZONE
CONTROLLER
RETURN
MIXED
AIRFLOW
RETURN
AIRFLOW
ZONE
DAMPER
ZONE
CONTROLLER
BYPASS
CONTROLLER
ZONE
DAMPER
62
Page 63
APOLLO THERMOSTAT WIRING — 48HJ004-007
LEGEND
C —
Contactor
NOTE: Refer to Product Support Bulletin No. 93-005 or
conta ct your lo cal Carrier re presentative for shield ed
wire applications when wiring the thermostat to the
Apollo control and for all communication bus wiring
connections.
Contactor
Ground
Compressor Lockout
Common
Direct Expansion
Economizer
Ground
Heat
Indoor-Air Quality
Normally Closed
Normally Open
Outdoor-Air Thermostat
Saturated-Air Temperature
®
—
Variable Volume/Variable Temperature
64
Page 65
Appl icat ion dat a
Condensate drain pan —
pan is supplied on all units. The condensate pan must be
externally trapped. Condensate drains are located on both
the bottom and end of the unit.
Ductwork —
no flanges are present, they must be field supplied. Secure
vertical discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to flanges. Fieldsupplied flanges can be attached to horizontal discharge
openings and all ductwork attached to flanges.
To convert from vertical discharge to horizontal
discharge (Durablade economizer only):
1. Remove economizer/two-position damper to gain
access to return duct opening.
2. Move the horizontal-discharge duct opening covers to
the vertical discharge openings.
3. Rotate economizer 90 degrees (until the economizer/
two-position damper motor faces the condenser
section).
4. Rotate the barometric relief damper 90 degrees.
5. Install block-off plate over the opening on the access
panel.
Thermostat —
recommended for all size 004-007 units equipped with
economizer.
Heating-to-cooling changeover —
matic changeover from heating to cooling when automatic
changeover thermostat and subbase are used.
Airflow —
on heating.
Maximum airflow —
sate blow-off from evaporator, airflow through units should
not exceed 500 cfm/ton.
Minimum airflow —
300 cfm/ton.
Minimum ambient operating temperature —
mum ambient operating temperature for size 004-014
standard units is 25 F. With accessory Motormaster
Motormaster IV control, units can operate at outdoor temperatures down to –20 F.
Maximum operating outdoor-air temperature —
Maximum outdoor-air operating temperature for cooling is
125 F.
High altitudes —
orifice. Refer to Altitude Compensation tables on page 50.
Minimum temperature —
entering the dimpled heat exchanger is 50 F continuous
and 45 F intermittent.
Motor data —
thru over the motor), air path, and specially designed
motors, the full horsepower (maximum continuous bhp)
listed in the Physical Data table and the notes following
each Fan Performance table can be utilized with extreme
confidence.
All ductwork must be attached to flanges. If
Use of 2-stage cooling thermostat is
Units are draw-thru on cooling and blow-thru
These may require a change to the gas
Due to Carrier’s internal unit design (draw-
A sloped condensate drain
All units are auto-
To minimize possibility of conden-
Minimum airflow for cooling is
Mini-
®
or
Minimum temperature of air
Using Carrier motors to the values listed in the Physical
Data, Fan Performance, and Evaporator-Fan Motor Data
tables will not result in nuisance tripping or premature motor failure. In addition, the unit warranty will not be
affected.
Apollo communicating controls —
cating controls must be used with a Carrier master
thermostat.
Thru-the-bottom connections —
the-bottom connections are needed to ensure proper connections when routing wiring and piping through the
basepan and roof curb. This accessory is used for electric
and control power only or electric, control power, and gas
piping depending on which accessory is selected.
Apollo communi-
The accessory thru-
MoistureMiser dehumidifation package
This option provides greater dehumidification by further
subcooling the hot liquid refrigerant leaving the condenser
coil. The MoistureMiser package consists of a subcooling
coil located on the leaving-air side of the evaporator coil.
The location of the coil in the indoor airstream enhances
the latent capacity of the 48HJ rooftop units by up to
40%.
Many buildings suffer damage or have poor indoor-air
quality due to overly-humid conditions. Building humidity
must be controlled for the following reasons:
1. Indoor-Air Quality:
Humidity is a major factor in the growth and propa-
gation of mold and mildew in a building. The mold
and mildew can spread quickly and grow in carpets
and ductwork and on walls, and often causes cases of
sick building syndrome. This syndrome can lead to
employee absenteeism due to illness, lower worker
productivity, and increased health care costs. The
American Society of Heating, Refrigeration, and Air
Conditioning Engineers (ASHRAE) recommends that
relative humidity levels in buildings be maintained
below 70%.
2. Comfort Levels:
High humidity levels cause the occupied space to
become uncomfortable, because humidity interferes
with the body’s natural cooling process (evaporation
at the skin surface).
3. Humidity Damage:
Humidity causes property damage, such as stained
wallpaper and ceiling tiles. Humidity can also damage
books and artwork, and create strong odors in carpets. In addition, humidity can contribute to unacceptable product quality in industrial processes.
4. Improper Ventilation:
Buildings in hot and humid geographical areas cannot
be properly ventilated due to high humidity levels outdoors, resulting in poor indoor-air quality.
65
Page 66
Application data (cont)
5. Equipment Inefficiency:
Humidity can cause inefficient operation of refrigera-
tors and freezers.
6. Increased Energy Costs:
Because of high humidity levels and less comfortable
conditions, thermostat set points are lowered to force
the HVAC (heating, ventilation, and air conditioning)
equipment to run longer and work harder to lower the
humidity levels. Also, in an attempt to control humidity, system designers typically oversize HVAC equipment and add reheat capability to get the desired
latent capacity. This results in higher initial equipment
costs, as well as increased energy expenses throughout the life of the unit.
Applications —
applications that are susceptible to problems caused by
high humidity levels. Some common applications include:
1. Restaurants:
The kitchen areas of restaurants have many humidity-
producing activities, such as dish washing and
cooking.
2. Supermarkets:
High humidity levels cause inefficiency in operation of
refrigeration and freezer systems.
3. Museums and Libraries:
Humidity can damage books and artwork.
4. Gymnasiums, Locker Rooms, and Health Clubs:
Shower areas and human perspiration cause uncom-
fortable occupied space conditions.
5. Hot and Humid Climates:
The southeastern United States is a good example of
this application. The MoistureMiser dehumidification
package becomes particularly useful when increased
amounts of the hot and humid outdoor air need to be
brought into the building for proper ventilation.
tureMiser dehumidification package, refer to the pressure
enthalpy curve, and analyze the MoistureMiser package effects on the refrigerant in the rooftop unit. The pressure
enthalpy curve shows the refrigerant cycle for an 48HJ
rooftop unit.
Standard Unit Refrigerant Cycle
pressure enthalpy curve, vapor leaving the compressor at a
high pressure and a high temperature enters the condenser. The condenser removes heat from the refrigerant, lowers its temperature, and changes it to a liquid. At point no.
2, the liquid leaves the condenser and enters a fixed expansion device that lowers the pressure of the refrigerant. At
point no. 3, the liquid enters the evaporator coil, where the
refrigerant increases in temperature and changes back to a
vapor. At point no. 4, the vapor leaves the evaporator and
reenters the compressor.
There are many different rooftop unit
To fully understand the operation of the Mois-
— At point no. 1 in the
Refrigerant Cycle Using MoistureMiser Dehumidification
Package — When a subcooler coil is added to the rooftop
unit, the refrigerant is affected in such a way that the unit
latent capacity is increased. The refrigerant cycle follows
the same path from point no. 1 to point no. 2 as the standard refrigerant cycle without a subcooler (see the pressure
enthalpy curve). However, at point no. 2, the liquid refrigerant enters the subcooler coil where the temperature is
lowered further. At point no. 2A, this subcooled liquid enters the TXV, which drops the pressure of the liquid. At
point no. 2B, the liquid enters the Acutrol™ device. The refrigerant leaves this device as a saturated vapor and enters
the evaporator at point no. 2C. The improved refrigeration effect can now be seen between point no. 2C and
point no. 3. The increase in the total refrigeration effect is
the additional enthalpy gained from point no. 2C to point
no. 3. However, the subcooler coil rejects this added refrigeration effect to the air downstream of the evaporator coil,
thus maximizing the overall latent effect. This improved latent effect is a direct result of the addition of the MoistureMiser subcooler coil to the refrigerant cycle.
Latent Capacity Effects
chart in Fig. 7 to see how the sensible heat factor decreases when the optional MoistureMiser dehumidification package is installed. This chart contains data for the 5-ton
48HJ unit operation, both with and without the MoistureMiser package, at 1750 cfm. Point no. 1 on the chart
represents the return-air dry bulb (80 F) and wet bulb (67 F)
conditions. Point no. 2 represents the supply-air conditions
for a standard 48HJ rooftop unit without the MoistureMiser dehumidification package. Point no. 3 represents the supply-air conditions for a 48HJ rooftop unit
with the MoistureMiser package. By connecting point
no. 1 and point no. 2 on the chart and finding the intersection on the sensible heat factor scale, the sensible heat factor is 0.73. Connect point no. 1 and point no. 3, and see
that the sensible heat factor is 0.58. This is a 17.5% increase in latent capacity for the given conditions. This increase in latent capacity allows the 48HJ rooftop units to
remove more moisture from the conditioned space; thus
lowering the humidity levels.
Dehumidification Effects
fication can be seen by analyzing the pounds of water per
pound of dry air found in the supply air. At point no. 2 in
the psychrometric chart, there are 65 grains (0.0092 lb) of
moisture per pound of dry air. At point no. 3, there are
58 grains (0.0083 lb) of moisture per pound of dry air.
This is a 12.1% decrease in the amount of water in the
supply air.
age operation does not affect the electrical data. The electrical data remains the same either with or without the
MoistureMiser package.
— Refer to the psychrometric
— Further evidence of dehumidi-
MoistureMiser dehumidification pack-
66
Page 67
The operating and shipping weights will be slightly increased with the addition of the MoistureMiser subcooler.
See the Physical Data table for added base unit weight with
this option.
Refer to cooling performance data, both with and without the MoistureMiser dehumidification package. Note the
greatly improved latent capacity with the MoistureMiser
dehumidification package.
Static pressure is also slightly affected by the addition of
the MoistureMiser dehumidification package. See Static
Pressure Drop table on page 49 when using this option.
MoistureMiser dehumidification package features
and benefits
• The MoistureMiser dehumidification package can
improve the humidity control of your rooftop equipment by up to 40%. This greatly reduces the risk of sick
building syndrome by reducing biological growth in both
ductwork and the rest of the building.
• The MoistureMiser dehumidification package improves
comfort levels in the building by better controlling the
humidity. This improved comfort level allows building
tenants to raise the cooling set point on the thermostats
for accumulated energy savings.
• Better humidity control lowers the risk of humidity-
induced property damage.
• The MoistureMiser dehumidification package permits
building refrigerators and freezers to operate more efficiently due to lower relative humidity levels. This is the
perfect solution for supermarket applications.
• The MoistureMiser subcooling circuit can be operated
by a humidity sensor. If the sensor is used, the MoistureMiser circuit will then only operate when needed. If
the humidity levels in the occupied space are acceptable
(such as in the spring and fall seasons), the MoistureMiser circuit will not operate. The rooftop unit is
then able to operate to its full sensible potential, which
provides more efficient performance and energy
savings.
• At lower outdoor temperatures, rooftop units with de-
humidification devices are subject to low suction pressure conditions. The MoistureMiser dehumidification
package contains a low-pressure switch that deactivates
the MoistureMiser under low suction pressure conditions without deactivating the compressors.
• Improved humidity control allows increased outdoor-air
ventilation in hot and humid geographical areas.
Humidity control also helps to improve the indoor-air
quality of the building.
• The MoistureMiser dehumidification package is factory
installed. There are no additional field installation costs.
There is also no need to purchase a roof curb from
another manufacturer, as standard Carrier roof curbs
will accommodate the 48HJ rooftop units which have
the MoistureMiser dehumidification package option
installed.
• The MoistureMiser dehumidification package is engineered and manufactured by Carrier Corporation for
Carrier rooftop units. All application support, service,
and warranty issues can therefore be handled through
one company.
• The slightly lower sensible capacities obtained when
using the MoistureMiser dehumidification package allow
the unit to operate for an extended period of time. The
more the unit operates, the more air is exposed to the
subcooling coil. This rooftop unit increased latent
capacity results in lower relative humidity levels in the
occupied space.
• It is no longer necessary to oversize equipment and add
reheat devices to properly dehumidify your building.
In a typical scenario, a building owner may need
39,000 Btuh of sensible capacity and 23,000 Btuh of
latent capacity (62,000 total Btuh). To accomplish this
without the MoistureMiser dehumidification package, a
1
/2-ton unit with a reheat device would be necessary
7
to attain the higher latent capacity required. This results
in a large up-front expense to oversize the equipment
1
from a standard 5-ton to a 7
/2-ton unit.
The building owner can now purchase a 5-ton unit with
the MoistureMiser dehumidification package for a small
additional up-front charge, and no reheat device will be
necessary to satisfy the cooling requirements. This
reduces both installation costs and operating costs
throughout the life of the product.
67
Page 68
Application data (cont)
PRESSURE ENTHALPY CURVE
NOTE: Numbers 1 through 4 indicate point numbers referred to in MoistureMiser Dehumidification Package Design Effects section.
68
Page 69
PSYCHROMETRIC CHART (48HJ006 SHOWN)
Entering Air (F) 80 db/67 wb
Leaving Air (F) 58.9 db/56.4 wb
(Without Subcooler)
Leaving Air (F) 63.0 db/56.8 wb
(With Subcooler)
Wet B u lb
Dry Bulb
Po int 1 —
Po int 2 —
Po int 3 —
wb—
LEGEND
db —
69
Page 70
T ypical wiring schematic (008-014, 460-3-60 shown)
CIRCUIT
BREAKER
CB
CB1
(014 Std)
VOLTSMFG. PT. NO.
24 V
460-3-60
POTTER & BRUMFIELD
W2BX-1024-3.2
HeinemannAirpax
CF3-Z228-41 219-3-2600-486
MUST TRIP
AMPS
3.2
8.5
70
Page 71
LEGEND FOR TYPICAL WIRING SCHEMATIC
IMPORTANT: Refer to unit wiring label for actual unit wiring.
Adjustable He at Anticipator
Contactor, Compressor
Capacitor
Circuit Breaker
Cooling Compensator
Compre ssor Loc kout
Compressor Motor
Connection
Diode
Enthalpy Control
Economizer
Emergency Power Supply (9-Volt Battery)
Equipment Grou nd
Economizer Relay
Freeze-Protection Thermostat
Flame Sen s or
Filter-Sta tu s Swit ch
Fuse
Gas V alve
Gas Val ve Relay
High-Pressure Switch
Hall-Effect Sensor
High Voltage
Ignitor
Induced-Dra ft Mo to r
Indoor ( Evap or at or ) Fan Con t a ct or
Indoor ( Evaporator ) Fan Mo to r
Integrated Gas Unit Controll er
Low-Pressure/Loss-of-Charge Switch
Limit Switch
Main Gas Valve
Motor
Normally Closed
Normally Open
Outdoor-Air Thermostat
Outdoor (Condenser) Fan Contactor
Outdoor (Condenser) Fan Motor
Plug
Plug Assembly
Quadr u pl e Termina l
Relay
Rollout Switch
Supply-Air Thermostat
Sensor
Switch Fully Open
Switch Fully Closed
Switc h Mi nimum Vent Position
Switch Maximum Vent Position
Thermostat-Cooling
Thermostat-Heating
Transformer
Field Splice
T erminal (Marked)
Terminal (Unmarked)
T erminal Block
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate comm on potent ial only,
not to represent wiring.
NOTES FOR TYPICAL WIRING SCHEMATIC
1. If any of t he or igin al w ire furn ishe d mus t b e repl ace d, i t mus t be rep la ced with
Type 90 C wire or its equivalent.
2. Three-phase motors are protected under primary single-phasing conditions.
3. Thermostat:
HH07AT170, 172, 174, and P27 2-2783.
Subbase:
HH93AZ176, 178 , and P272-1882, 18 83.
4. Set heat anticipator for first stage at .14 amp, second stage at 0.20 amp, except
for 008 and 009 low heat. Set both first and second stage at 0.14 amp.
5. Use copper conductors only.
71
Page 72
Guide specifications
Packaged Rooftop Cooling Unit with
Gas Heat — Constant Volume Application
HVAC Guide Specifications
Size Range:
Carrier Model Number:
Part 1 — General
1.01 SYSTEM DESCRIPTION
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI
B. Unit shall be designed to conform to ASHRAE 15,
C. Unit shall be UL tested and certified in accordance
D. Roof curb shall be designed to conform to NRCA
E. Insulation and adhesive shall meet NFPA 90A
F. Unit casing shall be capable of exceeding Federal
G. Each 48HJ unit is subjected to completely auto-
1.03 DELIVERY, STORAGE, AND HANDLING
Part 2 — Products
2.01 EQUIPMENT (STANDARD)
A. General:
B. Unit Cabinet:
3 to 12
50,000 to 250,000 Btuh,
Nominal Input Heating
Outdoor rooftop- or slab-mounted, electrically controlled heating and cooling utilizing a scroll compressor for cooling duty and gas combustion for heating
duty. Unit shall discharge supply air vertically or horizontally as shown on contract drawings.
Standards 210/240 or 360 and 270.
latest revision, and in accordance with UL 1995.
with ANSI Z21.47 Standard and UL listed and certified under Canadian Standards as a total package
for safety requirements.
Standards.
requirements for flame spread and smoke
generation.
Test Method Standard No. 141 (Method 6061)
500-Hour Salt Spray Test.
mated run testing on the assembly line. Each unit
contains a factory-supplied printout indicating tested
pressures, amperages, data, and inspectors; providing certification of the unit status at the time of
manufacture.
Unit(s) shall be stored and handled per manufacturer’s recommendations.
Factory-assembled, single-piece heating and cooling
unit. Contained within the unit enclosure shall be all
factory wiring, piping, controls, refrigerant charge
(R-22), and special features required prior to field
start-up.
1. Unit cabinet shall be constructed of galvanized
steel, bonderized and coated with a baked
enamel finish on all externally exposed surfaces, and have primer-coated interior surfaces
on all panels.
1
/2 Tons, Nominal Cooling
48HJD,
48HJE,
48HJF
2. Evaporator-fan cabinet interior shall be insulated with a minimum
glass insulation coated on the air side.
Aluminum foil-faced fiberglass insulation shall
be used in the heating compartment.
3. Cabinet panels shall be easily removable for
servicing.
4. Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging, and
forklift slots shall be provided to facilitate
maneuvering.
5. Unit shall have a factory-installed, sloped condensate drain pan made of a non-corrosive
material, providing a minimum
tion with both vertical and horizontal drains and
shall comply with ASHRAE 62.
6. Unit shall have factory-installed filter access
panel to provide filter access with tool-less
removal.
7. Unit shall have standard thru-the-bottom power
connection capability.
C. Fans:
1. Indoor blower (evaporator fan) shall be of the
belt-driven, double inlet, forward-curved centrifugal type. Belt drive shall include an adjustablepitch motor pulley.
2. Indoor blower (evaporator fan) shall be made
from steel with a corrosion-resistant finish and
shall be dynamically balanced.
3. Bearings shall be of the sealed, permanently
lubricated, ball-bearing type for longer life and
lower maintenance.
4. Condenser fan shall be of the direct-driven propeller type and shall discharge air vertically
upward.
5. Condenser fan shall have blades riveted to corrosion-resistant steel spiders and shall be
dynamically balanced.
6. Condenser-fan motor shall be totally enclosed.
7. Induced draft blower shall be of the directdriven, single inlet, forward curved, centrifugal
type, shall be made from steel with a corrosionresistant finish, and shall be dynamically
balanced.
2. Factory rubber-shock mounted and internally
spring mounted for vibration isolation.
3. On independent circuits (008-014).
E. Coils:
1. Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to
enhanced copper tubes with all joints brazed.
2. Tube sheet openings shall be belled to prevent
tube wear.
3. Evaporator coil shall be of the face-split design.
1
/2-in. thick flexible fiber-
3
/4-in. connec-
72
Page 73
F. Heating Section:
1. Induced draft combustion type with energy saving direct spark ignition system, redundant
main gas valve, and 2-stage heat.
2. The heat exchanger shall be of the tubular section type constructed of a minimum of 20 gage
steel coated with a nominal 1.2 mil aluminumsilicone alloy for corrosion resistance, and shall
have a 10-year warranty.
3. Burners shall be of the in-shot type constructed
of aluminum coated steel.
4. The Integrated Gas Control (IGC) board shall
provide timed control of evaporator fan functioning and burner ignition. An LED (lightemitting diode) shall provide diagnostic information. The LED shall be visible without
removing the control box access panel.
5. IGC board contains anti-cycle protection for gas
heat operation (after 4 continuous cycles on
high temperature limit switch and one cycle on
the flame rollout switch).
G. Refrigerant Components:
Refrigerant circuit components shall include:
1. Acutrol™ feed system.
2. Refrigerant strainer, or filter drier.
3. Service gage connections on suction, discharge,
and liquid lines.
4. Ability to route gage hoses through unit top
cover, or outdoor panel.
H. Filter Section:
1. Standard filter section shall consist of factoryinstalled low-velocity, throwaway 2-in. thick
fiberglass filters of commercially available sizes.
2. Filter face velocity shall not exceed 300 fpm at
nominal airflows.
3. Filter section shall use only one size filter.
4. Filters shall be accessible through an access
panel with “tool-less” removal.
I. Controls and Safeties:
1. Unit Controls:
Unit shall be complete with self-contained low-
voltage control circuit protected by a fuse on
the 24-v transformer side.
2. Safeties:
a. Unit shall incorporate a solid-state compres-
sor protector which provides anti-cycle reset
capability at the space thermostat, should
any of the following standard safety devices
trip and shut off compressor.
The lockout protection shall be easily disconnected at the control board, if necessary.
b. Heating section shall be provided with the
following minimum protections:
1) High-temperature limit switches.
2) Induced draft motor speed sensor.
3) Flame rollout switch.
4) Flame proving controls.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at
125 F ambient outdoor temperature, meeting
maximum load criteria of ARI Standard 210/
240 or 360 at ±10% voltage.
2. Compressor with standard controls shall be
capable of operation down to 25 F ambient
outdoor temperature.
K. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single factory-predrilled location.
L. Motors:
1. Compressor motors shall be cooled by refrigerant passing through motor windings and shall
have line break thermal and current overload
protection.
2. Indoor blower (evaporator-fan) motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
3. Totally enclosed condenser-fan motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
4. Induced draft motor shall have permanently
lubricated, sealed bearings and inherent automatic reset thermal overload protection.
M. Special Features:
Certain features are not applicable when the features designated by * are specified. For assistance in
amending the specifications, contact your local
Carrier Sales Office.
*1. Direct Digital Controls:
a. Shall be available as a factory-installed
option.
b. Shall actively monitor all modes of opera-
tion, as well as evaporator-fan status, filter
status, indoor-air quality, supply-air temperature, and outdoor-air temperature.
c. Shall work with Carrier TEMP and VVT
systems.
d. Shall have built-in diagnostics for thermostat
commands for both staged heating and cooling, evaporator-fan operation, and economizer operation.
e. Shall be equipped with a 5-minute time
delay between modes of operation.
2. Roof Curbs:
a. Formed galvanized steel with wood nailer
strip and capable of supporting entire unit
weight.
®
73
Page 74
Guide specifications (cont)
b. Allows for installing and securing ductwork
to curb prior to mounting unit on the curb.
*3. Integrated Economizers:
a. Integrated integral-modulating type capable
of simultaneous economizer and compressor
operation.
b. Includes all hardware and controls to provide
cooling with outdoor air.
c. Equipped with low-leakage dampers not to
exceed 3% leakage, at 1 in. wg pressure differential (Durablade economizer).
d. Capable of introducing up to 100% outdoor
air in both minimum and fully open
positions.
e. Equipped with a gravity relief sliding plate
damper (Durablade economizer). Damper
shall close upon unit shutoff.
f. EconoMi$er shall be equipped with a baro-
metric relief damper with up to 100% of
return air (004-007) or 90% of return air
(008-014) relief. The Durablade economizer is equipped with 30% of return-air
relief (004-014).
g. Designed to close damper during loss-of-
power situations with emergency power
supply (Durablade economizer) or spring
return built into motor (EconoMi$er).
h. Dry bulb outdoor-air thermostat protection
shall be provided as standard.
i. Durablade economizer is a guillotine-style
damper, and the EconoMi$er is a parallel
blade design.
*4. Manual Outdoor-Air Damper:
Manual damper package shall consist of
damper, birdscreen, and rainhood which can be
preset to admit up to 50% outdoor air for yearround ventilation.
*5. 100% Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up
to 100% outdoor air.
b. Damper shall close upon indoor (evaporator)
fan shutoff.
c. Designed to close damper during loss of
power situations.
d. Equipped with barometric relief damper.
*6. 25% Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up
to 25% outdoor air.
b. Damper shall close upon indoor (evaporator)
fan shutoff.
c. Designed to close damper during loss of
power situations.
d. Equipped with barometric relief damper.
*7. Solid-State Enthalpy Control:
Capable of sensing outdoor-air enthalpy content (temperature and humidity) and control-ling
economizer cut-in point to have minimum heat
content air passing over the evaporator coil for
most efficient system operation.
*8. Differential Enthalpy Sensor:
a. For use with Durablade economizer only.
b. Capable of comparing enthalpy content
(temperature and humidity) of outdoor and
indoor air and controlling economizer cut-in
point at the most economical level.
*9. Low Ambient Control Packages:
Each package consists of condenser-coil temperature sensor to maintain condensing temperature between 90 F and 110 F at outdoor
ambient temperatures down to –20 F by condenser-fan speed modulation or condenser-fan
cycling.
*10. Thermostat and Subbase:
Provides staged cooling and heating automatic
(or manual) changeover, fan control, and indicator light.
11. Thru-The-Bottom Service Connectors:
Kit shall provide connectors to permit electrical
and gas connections to be brought to the unit
through the basepan.
*12. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic
thermostat. Shall use built-in compressor cycle
delay control for both heating and cooling duty.
Capable of working with Carrier direct digital
controls.
13. Condenser Coil Hail Guard Assembly:
Hail guard shall protect against damage from
hail and flying debris.
14. High Static Motor and Drive (004-012 only):
High Static motor and drive shall be factory-
installed to provide additional performance
range.
15. Condenser Coil Guard Grille:
The grille protects the condenser coil from
damage by large objects without increasing unit
clearances.
16. Compressor Cycle Delay:
Unit shall be prevented from restarting for a
minimum of 5 min. after shutdown.
17. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or
indoor-air filter (CLEAN/DIRTY). Status shall
be displayed over communication bus when
used with direct digital controls or with an indicator light at the thermostat.
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Page 75
18. Unit-Mounted, Non-Fused Disconnect Switch:
Shall be factory-installed, internally-mounted,
NEC and UL approved non-fused switch shall
provide unit power shutoff. Shall be accessible
from outside the unit and shall provide power
off lockout capability.
19. Convenience Outlet:
Shall be factory-installed and internally-
mounted with easily accessible 115-v female
receptacle. Shall include 15 amp GFI receptable with independent fuse protection. Voltage
required to operate convenience outlet shall be
provided by a factory-installed step-down transformer. Shall be accessible from outside the
unit.
20. MoistureMiser Dehumidification Package:
The dehumidification package is a factory-
installed option that provides increased dehumidification by further subcooling the hot liquid
refrigerant leaving the condenser coil. The
package consists of a subcooling coil located on
the leaving-air side of the evaporator coil. The
location of this coil in the indoor airsteam
greatly enhances the latent capacity of the
48HJ units.
The package shall be equipped with crankcase
heater(s), low pressure switch(es), and thermostatic expansion valve(s) (TXV). Low pressure
switch(es) prevents evaporator coil freeze up
and TXV(s) assure a positive superheat condition. If the operation of the subcooling coil is
controlled by a field-installed, wall-mounted
humidistat, the dehumidification circuit will then
operate only when needed. Optional field connections for the humidistat are made in the low
voltage compartment of the unit control box.
21. Humidistat:
Field-installed, wall-mounted humidistat is used
to control activation of the dehumidification
package. The humidistat can be set for humidity
levels between 20% and 80% relative humidity.
22. Hinged Panel Option:
Hinged panel option provide hinged access
panels for the filter, compressor, evaporator
fan, and control box areas. Filter hinged panels
permit tool-less entry for changing filters. Each
hinged panel is permanently attached to the
rooftop unit.
23. Flue Hood Protector Assembly:
Provides protection from the hot sides of the
gas flue hood.
*24. LP Gas Kit:
Package shall contain all the necessary hardware and instructions to convert a standard natural gas unit for use with liquid propane.
25. NOx Reduction Kit:
Package shall contain all necessary hardware
and instructions to convert a standard natural
gas unit to reduce the nitrous oxide (NOx) emissions to meet the California Air Quality Management NOx requirement of 40 nanograms/
joule or less on 004-006 sizes.
26. Flue Discharge Deflector:
Package shall contain single-piece deflector and
hardware to exhaust the flue discharge up and
away from unit. The flue discharge deflector
shall allow minimum flue side clearances to
combustibles to be reduced to 18 inches.
27. Energy$Recycler:
The package shall be an outdoor rooftop or
slab mounted, electronically controlled, air-toair heat pump unit utilizing a rotary compressor
for cooling and heating duty.
The Energy$Recycler shall recover energy from
building exhaust air and pre-condition ventilation air to allow higher ventilation requirements
and minimizing energy cost.
28. EconoMi$er and Power Exhaust:
Package shall provide control of Internal build-
ing pressure. The system shall exhaust up to
100% of return air.
29. Outdoor Air Enthalpy Sensor:
The outdoor air enthlapy sensor shall be used
with the EconoMi$er device to provide single
enthalpy control. When used in conjunction
with a return air enthalpy sensor, the
EconoMi$er device will provide different
enthalpy control. The sensor allows the
EconoMi$er controller to determine if outside
air is suitable for free cooling.
30. Return Air Enthalpy Sensor:
The return air enthalpy sensor shall be used
with the EconoMi$er device. When used in conjunction with an outdoor air enthalpy sensor,
the EconoMi$er device will provide differential
enthalpy control.
31. Return Air Temperature Sensor:
The return air temperature sensor shall be used
with the EconoMi$er device. When used in conjunction with an outdoor air temperature sensor, the EconoMi$er device will provide
differential temperature control.
32. Indoor Air Quality (CO
) Sensor:
2
a. Shall have the ability to provide demand ven-
tilation indoor air quality (IAQ) control
through the economizer with an IAQ sensor.
b. The IAQ sensor shall be available in duct
mount, wall mount, and wall mount with
LED display. The set point shall have adjustment capability.
75
Page 76
Carrier Corporation • Syracuse, New York 1322112-99
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 1 a 6a
NewPg 76Catalog No. 524-894Printed in U.S.A.PC 111 Form 48HJ-11PD
Book 1
Tab OP1b
Replaces: 48HJ-10PD
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