Carrier WeatherMaster 48HC14, WeatherExpert 48LC**08 Series, WeatherExpert 48LC**09 Series, WeatherExpert 48LC**12 Series Installation Instructions Manual
WeatherMaster
48HC14
Single Package Rooftop Gas Heat/Electric Cooling
®
Unit with Puron
(R-410A) Refrigerant
Installation Instructions
48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor fan
control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable Frequency
Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshooting manual.
®
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . 7
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . . 7
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 — Provide Unit Support. . . . . . . . . . . . . . . . . . 8
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 10
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 10
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required). . . . . . . . . . . . . . . . . . 11
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 12
• ECONOMIZER HOOD REMOVAL AND SETUP —
FACTORY OPTION
• TWO POSITION DAMPER HOOD REMOVAL AND
SETUP — FACTORY OPTION
• ECONOMIZER HOOD AND TWO-POSITION HOOD
Step 9 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . 14
Step 10 — Install Gas Piping. . . . . . . . . . . . . . . . . . . 14
• FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTION)
Step 11 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Step 12 — Make Electrical Connections . . . . . . . . . 18
• FIELD POWER SUPPLY
• ALL UNITS
• UNITS WITHOUT FACTORY-INSTALLED NONFUSED DISCONNECT OR HACR CIRCUIT BREAKER
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR CIRCUIT BREAKER
• CONVENIENCE OUTLETS
• HACR CIRCUIT BREAKER
• FACTORY OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
• FIELD CONTROL WIRING
• THERMOSTAT
• UNIT WITHOUT THRU-BASE CONNECTION KIT
• HEAT ANTICIPATOR SETTINGS
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Humidi-MiZer® System Control Connections . . . . .28
• HUMIDI-MIZER — SPACE RH CONTROLLER
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . .30
• SYSTEM COMPONENTS
• SPECIFICATIONS
•INPUTS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• ENTHALPY SETTINGS
• TWO-SPEED FAN OPERATION
• CHECKOUT
• TROUBLESHOOTING
Low Ambient Control (Factory Option). . . . . . . . . . .43
Staged Air Volume (SAV™) with Variable Frequency
Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . .43
ComfortLink Controls (Factory Option) . . . . . . . . . .43
PremierLink™ Controller (Factory Option) . . . . . . .47
RTU Open Controller System (Factory-Installed
Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
• ADDITIONAL APPLICATION DATA
Step 13 — Adjust Factory-Installed Options . . . . . .48
• SMOKE DETECTORS
• ECONOMI$ER IV OCCUPANCY SWITCH
Step 14 — Install Accessories . . . . . . . . . . . . . . . . . .48
Step 15 — Check Belt Tension . . . . . . . . . . . . . . . . .48
• BELT FORCE — DEFLECTION METHOD
• BELT TENSION METHOD
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .49
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
Catalog No. 04-53480222-01 Printed in U.S.A. Form 48HC-14-04SI Pg 1 2-19 Replaces: 48HC-14-03SI
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
accessories when modifying this product. Refer to the
individual instructions packaged with the kits or accessories
when installing.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol . When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the safetyalert symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than 0.5
psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
WARNING
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal
injury or death due to carbon-monoxide poisoning, if combustion products infiltrate into the building.
Check that all openings in the outside wall around the vent
(and air intake) pipe(s) are sealed to prevent infiltration of
combustion products into the building.
Check that furnace vent (and air intake) terminal(s) are not
obstructed in any way during all seasons.
AVERTISSEMENT
RISQUE D’INTOXICATION AU MONOXYDE DE
CARBONE
Si ces directives ne sont pas suivies, cela peut entraîner des
blessures graves ou une intoxication au monoxyde de
carbone pouvant causer la mort, si des produits de
combustion s’infiltrent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur
extérieur autour du ou des tuyaux d’évent (et de la prise
d’air) sont scellées de manière à empêcher l’infiltration de
produits de combustion dans le bâtiment.
Veiller à ce que la ou les sorties de l’évent de l’appareil de
chauffage (et la prise d’air) ne soient, en aucune façon,
obstruées, quelle que soit la saison.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refrigerants and oils.
WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing air conditioning
equipment.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
®
Puron
(R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
2
WARNING
GAS VALVE
INLET PRESSURE
TAP SET SCREW
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, and/or property damage.
Inlet pressure tap set screw must be tightened and
1
/8-in.
NPT pipe plug must be installed to prevent gas leaks.
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, and/or property damage.
Manifold pressure tap set screw must be tightened and
1
/8-in.
NPT pipe plug must be installed to prevent gas leaks.
MANIFOLD PRESSURE
TAP SET SCREW
MANIFOLD
GAS VALVE
GENERAL
See Fig. 1-3 for unit options and dimensions.
Rated Indoor Airflow (cfm)
Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.
Table 1 — Rated Indoor Airflow (cfm)
MODEL NUMBER
48HC*D/E/G14 4375
FULL LOAD AIRFLOW
(CFM)
3
Model Series - WeatherMaster
®
HC - High Efficiency
Unit Heat Type
48 - Gas Heat Packaged Rooftop
Cooling Tons
14 - 12.5 ton
Heat Options
D = Low Gas Heat
E = Medium Gas Heat
F = High Gas Heat
S = Low Heat w/ Stainless Steel Exchanger
R = Medium Heat w/ Stainless Steel Exchanger
T = High Heat w/ Stainless Steel Exchanger
Sens or Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO
2
F = RA Smoke Detector and CO
2
G = SA Smoke Detector and CO
2
H = RA + SA Smoke Detector and CO
2
Indoor Fan Options
1 = Standard Static Option - Belt Drive
2 = Medium Static Option - Belt Drive
3 = High Static Option - Belt Drive
C = High Static Option with High Efficiency Motor - Belt Drive
Refrig. Sys te ms Options
D = Two stage cooling model
E = Two stage cooling models with Humidi-MiZer
G = Two stage cooling models with Motormaster
Low Ambient Controller
Coil Options (RTPF) (Outdoor - Indoor - Hail Guard)
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu -Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Voltage
1 = 575/3/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
A = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical Controls Can be used with W7212
EconoMi$er IV (Non-Fault Detection and Diagnostic)
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical w/ 2-speed fan and W7220 Econo
controller Controls. Can be used with W7220 EconoMi$er X
(with Fault Detection and Diagnostic)
D = ComfortLink Controls
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
U =
Temp Ultra Low Leak Economizer w/ Baro Relief
W =
Enthalpy Ultra Low Leak Economizer w/ Baro Relief
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Panels
4 = Hinged Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
C = Foil Faced Insulation
D = Foil Faced Insulation with
Unpowered Convenience Outlet
E = Foil Faced Insulation with
Powered Convenience Outlet
F = Foil Faced Insulation & Hinged Panels
G = Foil Faced Insulation & Hinged Panels
with Unpowered Convenience Outlet
H = Foil Faced Insulation & Hinged Panels
with Powered Convenience Outlet
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Breaker
C = Non-Fused Disconnect
D = Thru-The-Base Connections
E = HACR and Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base
G = 2-Speed Indoor Fan (VFD) Controller
H = 2-Speed Fan Controller (VFD) and
HACR
J = 2 Speed Fan Controller &
Non-Fused Disconnect
K =
2-Speed Fan Controller w/ Thru-The-Base
L = HACR w/ Thru-The-Base &
2-Speed Fan Controller
M = 2-Speed Fan Controller w/ Non-Fused
Disconnect & Thru-The-Base
Example:
Position:
48HCDE14A2A6A0A3B0
1234567891011 12 13 14 15 16 17 18
Fig. 1 — 48HC 14 Model Number Nomenclature
4
Fig. 2 — Unit Dimensional Drawing — 14 Size Unit
5
Fig. 2 — Unit Dimensional Drawing — 14 Size Unit (cont)
6
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruction or for vertical clearances.
LOCATION DIMENSION CONDITION
A
48-in. (1219 mm)
18-in. (457 mm)
18-in. (457) mm
12-in. (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42-in. (1067 mm)
36-in. (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check sources of flue products within 10 ft (3 m) of unit fresh air intake hood
C
36-in. (914 mm)
18-in. (457 mm)
Side condensate drain is used
Minimum clearance
D
48-in. (1219 mm)
42-in. (1067 mm)
36-in. (914 mm)
Special
No flue discharge accessory installed, surface is combustible material
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10 ft (3 m) of this unit’s flue outlet
C
B
A
D
Fig. 3 — Service Clearance Dimensional Drawing
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Electrical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or
other) that provides for at least the minimum clearances required for safety. This includes the clearance to combustible
surfaces, unit performance and service access below, around
and above unit as specified in unit drawings. See Fig. 3.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class A,
B, or C roof-covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents, relief valves, or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto the unit.
Select a unit mounting system that provides adequate height to
allow installation of condensate trap per requirements. Refer to
“Step 11 — Install External Condensate Trap and Line” on
page 17 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 2.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on curbmounted units, some accessories must be installed on the unit
before the unit is placed on the curb. Review the following for
recommended sequences for installation steps.
CURB-MOUNTED INSTALLATION
1. Install curb
2. Install field-fabricated ductwork inside curb
3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to “Step 11 —
Install External Condensate Trap and Line” on page 17 for
details)
5. Rig and place unit
7
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. Install other accessories
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports
2. Check and tighten the bottom condensate drain connection
plug
3. Rig and place unit
4. Convert unit to side duct connection arrangement
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. Install other accessories
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for
a curb installation. Adapt as required to suit specific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with
transportation agency.
Confirm before installation of unit that voltage, amperage and
circuit protection requirements listed on unit data plate agree
with power supply provided.
On units with hinged panel option, check to be sure all latches
are snug and in closed position.
Locate the carton containing the outside air hood parts; see
Fig. 13 and 14. Do not remove carton until unit has been rigged
and located in final position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in
Fig. 4. Assemble and install accessory roof curb in accordance
with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical for a
watertight seal. Install gasket supplied with the roof curb as shown
in Fig. 4. Improperly applied gasket can also result in air leaks and
poor unit performance.
Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are show in Fig. 5. Refer
to Accessory Roof Curb Installation Instructions for additional
information as required.
Table 2 — Operating Weights
48HC**14
COMPONENT UNITS LB (KG)
BASE UNIT
ECONOMIZER
Vertical
Horizontal
Powered Outlet
Humidi-MiZer System
CURB
14-in. (356 mm)
24-in. (610 mm)
1430 (649)
103 (47)
242 (110)
35 (16)
90 (41)
180 (82)
255 (116)
8
Fig. 4 — Roof Curb Details
9
MAXIMUM ALLOWABLE DIFFERENCE IN. (MM)
A-B B-C A-C
0.5” (13) 1.0” (25) 1.0” (25)
A
B
C
Step 5 — Field Fabricate Ductwork
NOTE: Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimen-
sions are equal to or greater than the unit supply duct opening
dimensions for the first 18-in. (458 mm) of duct length from
the unit basepan.
Insulate and weatherproof all external ductwork, joints, and
roof openings with counter flashing and mastic in accordance
with applicable codes.
Ducts passing through unconditioned spaces must be insulated
and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should
be ducted through the roof deck to comply with applicable fire
codes.
Fig. 5 — Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter flashing
as shown. Ductwork must be attached to curb and not to the
unit.
IMPORTANT: If the unit’s gas connection and/or electric and
control wiring is to be routed through the basepan and the unit
is equipped with the factory-installed Thru-the-Base service
option see the following sections:
• Factory-Option Thru-Base Connections (Gas Connection) on page 15
• Factory-Option Thru-Base Connections (Electrical Connections) on page 23
If using the field-installed Thru-the-Base accessory follow the
instructions provided with the accessory kit.
NOTE: If gas and/or electrical connections are not going to occur
at this time, tape or otherwise cover the fittings so that moisture
does not get into the building or conduit in the interim.
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6-in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit with a minimum of 3 equally spaced 4-in. x
4-in. (102 mm x 102 mm) pads on each side.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roofing
materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
Step 6 — Rig and Place Unit
When the unit is ready to be rigged and no longer will be lifted
by a fork truck, the wood protector under the basepan must be
removed. Remove 4 screws from each base rail. Wood protector will drop to the ground. See instructions on the unit base
rails.
Keep unit upright and do not drop. Spreader bars are not required. Rollers may be used to move unit across a roof. Level
by using unit frame as a reference. See Table 2 and Fig. 6 for
additional information.
Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed
for handling by fork truck when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering the
crate.
Before setting the unit onto the curb, recheck gasketing on
curb.
10
NOTES:
1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not
used.
2. Dimensions in ( ) are in millimeters.
3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base
rails are centered around the unit center of gravity. Use wooden top to prevent rigging
straps from damaging unit.
UNIT
MAX
WEIGHT
DIMENSIONS
ABC
lb kg in. mm in. mm in. mm
48HC**14 2215 1009 116.0 2945 62.5 1590 59.5 1510
DETAIL “A”
PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
SEE DETAIL “A”
“B”
“A”
“C”
36"-54"
(914-1371)
Original
Position
New Position
(moved 12.5-in.)
POSITIONING ON CURB
For full perimeter curbs CRRFCURB074A00 and 075A00,the
clearance between the roof curb and the front and rear base
rails should be
curb and the end base rails should be
1
/4-in. (6.4 mm). The clearance between the
1
/2-in. (13 mm). For retrofit applications with curbs CRRFCURB003A01 and 4A01, the
unit should be position as shown in Fig. 7. Maintain the
1
15
/2-in. (394 mm) and 85/8-in. (220 mm) clearances and allow
5
the 22
/16-in. (567 mm) dimension to float if necessary.
Fig. 7 — Retrofit Installation Dimensions
If the alternative condensate drain location through the bottom
of the unit is used in conjunction with a retrofit curb, the hole
in the curb must be moved 12
1
/2-in. (320 mm) towards the end
of the unit. (See Fig. 8.)
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Remove all shipping materials and top skid. Remove extra cen-
ter post from the condenser end of the unit so that the condenser end of the unit matches Fig. 29 and 30. Recycle or dispose of
all shipping materials.
Fig. 6 — Rigging Details
Fig. 8 — Alternative Condensate Drain Hole Positions
IMPORTANT: If the unit has the factory-installed Thru-theBase option, make sure to complete installation of the option
before placing the unit on the roof curb. See the following sections:
• Factory-Option Thru-Base Connections (Gas Connection) on page 15
• Factory-Option Thru-Base Connections (Electrical Connections) on page 23
NOTE: If gas and/or electrical connections are not going to occur
at this time, tape or otherwise cover the fittings so that moisture
does not get into the building or conduit in the interim.
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required)
Unit is shipped in the vertical duct configuration. Unit without
factory-installed economizer or return-air smoke detector option may be field-converted to horizontal ducted configuration.
To convert to horizontal configuration, remove screws from
11
side duct opening covers (see Fig. 9) and remove covers. Use
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
SCREWS
DUCT COVERS
SHEET METAL
FACE UP
BASEPAN
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
the screws to install the covers on vertical duct openings with
the insulation-side down. The panels must be inserted into the
notches on the basepan to properly seal. The notches are covered by the tape used to secure the insulation to the basepan
and are not easily seen. See Fig. 10 for position of the notches
in the basepan. Seals around duct openings must be tight. Secure with screws as shown in Fig. 11. Cover seams with foil
duct tape.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative data
plate when insulating horizontal ductwork.
Fig. 9 — Horizontal Conversion Panels
NOTCHES
NOTCHES
Fig. 11 — Horizontal Duct Panels In Place
Step 8 — Install Outside Air Hood
ECONOMIZER HOOD REMOVAL AND SETUP — FACTORY OPTION
1. The hood is shipped in knock-down form and located in
the return air compartment. It is attached to the economizer using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel.
(See Fig. 12.)
3. Locate and cut the (2) plastic tie-wraps, being careful to
not damage any wiring. (See Fig. 13.)
4. Carefully lift the hood assembly through the filter access
opening and assemble per the steps outlined in Economizer Hood and Two-Position Hood on page 13.
BASEPAN
Fig. 10 — Location of Notches
Fig. 12 — Typical Access Panel Locations
12
Economizer
Cut Plastic Ties
(2) Places
Remove Hood Parts
HOOD PARTS
PLASTIC TIE WRAP
QTY (2)
SCREWS FORMETAL TRAY
QTY (2)
TOP
PAN EL
INDOOR
COIL
ACCESS
PAN EL
INDOOR
COIL
ACCESS
PAN EL
CAULK
HERE
TOP
PAN EL
Fig. 13 — Economizer Hood Package Location
TWO POSITION DAMPER HOOD REMOVAL AND
SETUP — FACTORY OPTION
1. The hood is shipped in knock-down form and assembled
to a metal support tray using plastic stretch wrap. Located
in the return air compartment, the assembly’s metal tray is
attached to the basepan and also attached to the damper
using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel.
(See Fig. 12.)
3. Locate the (2) screws holding the metal tray to the basepan
and remove. In order to remove the screws, it may be necessary to remove the panel underneath the two-position
damper. Remove the two screws. Locate and cut the (2)
plastic tie-wraps securing the assembly to the damper.
(See Fig. 14.) Be careful to not damage any wiring or cut
tie-wraps securing any wiring.
4. Carefully lift the hood assembly (with metal tray) through
the filter access opening and assemble per the steps outlined in Economizer Hood and Two-Position Hood.
5. If removed, reattach the panel under the damper.
ECONOMIZER HOOD AND TWO-POSITION HOOD
NOTE: If the power exhaust accessory is to be installed on the
unit, the hood shipped with the unit will not be used and must be
discarded. Save the aluminum filter for use in the power exhaust
hood assembly.
1. The indoor coil access panel will be used as the top of the
hood. If the panel is still attached to the unit, remove the
screws along the sides and bottom of the panel. See
Fig. 15.
2. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Be careful not to lift the
panel too far as it might fall out. Use the screws provided
to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 16.
3. Remove the shipping tape holding the economizer barometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 17. Secure hood divider with 3 screws on each hood
side. The hood divider is also used as the bottom filter rack
for the aluminum filter.
5. Attach the post that separates the filters with the screws
provided.
6. Open the filter clips which are located underneath the
hood top. Insert the aluminum filters into the bottom filter
rack (hood divider). Push the filter into position past the
open filter clips. Close the filter clips to lock the filters
into place. See Fig. 17.
7. Install the two rain deflectors on the edge of the hood top
as shown in Fig. 16.
8. Caulk the ends of the joint between the unit top panel and
the hood top as shown in Fig. 15.
9. Replace the filter access panel.
Fig. 14 — Two-Position Damper Hood Package
Location
Fig. 15 — Indoor Coil Access Panel Relocation
13
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
FLUE
HOOD
CONTROL BOX
ACCESS PANEL
SCREW
LEFT
HOOD
SIDE
HOOD DIVIDER
TOP
PAN EL
INDOOR COIL
ACCESS PANEL
Fig. 16 — Economizer Hood Construction
Fig. 17 — Economizer Filter Installation
Step 9 — Install Flue Hood
The flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove the panel below the
control box access panel to access the flue hood shipping location. Using screws provided, install flue hood and screen in location shown in Fig. 18.
Fig. 18 — Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with local
building codes and with applicable national codes. In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC).
In Canada, installation must be in accordance with the CAN/
CSA B149.1 and CAN/CSA B149.2 installation codes for gas
burning appliances.
This unit is factory equipped for use with natural gas (NG) fuel
at elevations up to 2000 ft (610 m) above sea level. Unit may
be field converted for operation at elevations above 2000 ft
(610 m) and/or for use with liquefied petroleum fuel. See accessory kit installation instructions regarding these accessories.
NOTE: In U.S.A. the input rating for altitudes above 2000 ft
(610 m) must be derated by 4% for each 1000 ft (305 m) above
sea level. In Canada the input rating must be derated by 10% for
altitudes of 2000 ft (610 m) to 4500 ft. (1372 m) above sea level.
For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1250 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating (see Tables 3
and 4). For liquified petroleum (LP) applications, the gas pressure must not be less than 11 in. wg (2740 Pa) or greater than
13 in. wg (3240 Pa) at the unit connection (see Tables 5 and 6).
The gas supply pipe enters the unit at the burner access panel
on the front side of the unit, through the long slot at the
bottom of the access panel. The gas connection to the unit is
made to the
Manifold pressure is factory-adjusted for NG fuel use. Adjust
as required to obtain best flame characteristics.
Table 3 — Natural Gas Supply Line Pressure Ranges
3
/4-in. FPT gas inlet port on the unit gas valve.
UNIT MIN MAX
48HC**14 5.0 in. wg (1250 Pa) 13.0 in. wg (3240 Pa)
Table 4 — Liquid Propane Supply Line Pressure
Ranges
UNIT MIN MAX
48HC**14 11.0 in. wg (2740 Pa) 13.0 in. wg (3240 Pa)
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL HIGH FIRE LOW FIRE
48HC**14 3.5 in. wg (872 Pa) 2.0 in. wg (498 Pa)
14
Manifold pressure for liquid propane (LP) fuel use must be ad-
STEEL PIPE NOMINAL
DIAMETER (in.)
SPACING OF SUPPORTS X
DIMENSION (ft)
1
/
2
6
3
/4 or 1 8
1
1
/4 or larger 10
LEGEND
NFGC — National Fuel Gas Code
* Field supplied.
NOTE: Follow all local codes.
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-FABRICATED
SUPPORT
*
FROM
GAS
METER
11/2” ELECTRICAL
BULKHEAD
CONNECTOR
1
/2” ELECTRICAL
BULKHEAD
CONNECTOR
3
/4” NPT GAS
ADAPTER
FITTING
justed to specified range. Follow instructions in the accessory
kit to make initial readjustment.
Table 6 — Liquid Propane Manifold Pressure Ranges
UNIT HIGH FIRE LOW FIRE
48HC**14 10.0 in. wg (2490 Pa) 5.7 in. wg (1420 Pa)
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment damage.
When connecting the gas line to the unit gas valve, the in-
staller MUST use a backup wrench to prevent damage to
the valve.
Install a gas supply line that runs to the unit heating section.
Refer to the NFPA 54/NFGC or equivalent code for gas pipe
sizing data. Size the gas supply line to allow for a maximum
pressure drop of 0.5 in. wg (124 Pa) between gas regulator
source and unit gas valve connection when unit is operating at
high-fire flow rate.
The gas supply line can approach the unit in three ways: horizontally from outside the unit (across the roof), thru-curb/under
unit basepan (accessory kit required) or through unit basepan
(factory-option or accessory kit required). Consult accessory
kit installation instructions for details on these installation
methods. Observe clearance to gas line components per
Fig. 19.
Fig. 19 — Gas Piping Guide
FACTORY OPTION THRU-BASE CONNECTIONS (GAS
CONNECTION)
3
This service connection kit consists of a
er fitting (stainless steel), a 1/2-in. electrical bulkhead connector and a 1
1
/2-in. electrical bulkhead connector, connected to an
/4-in. NPT gas adapt-
“L” bracket covering the embossed (raised) section of the unit
basepan in the condenser section. See Fig. 20.
Fig. 20 — Thru-the-Base Option, Shipping Position
1. Remove the “L” bracket assembly from the unit (see
Fig. 20).
2. Cut and discard the wire tie on the gas fitting. Hand
tighten the fitting if it has loosened in transit.
3. Remove connector plate assembly from the “L” bracket
and discard the “L” bracket, but retain the washer head
screws and the gasket (located between the “L” bracket
and the connector plate assembly.)
NOTE: Take care not to damage the gasket, as it is reused in the
following step.
4. Place the gasket over the embossed area in the basepan,
aligning the holes in the gasket to the holes in the basepan.
See Fig. 21.
5. Install the connector plate assembly to the basepan using 8
of the washer head screws.
NOTE: If gas and/or electrical connections are not going to occur
at this time, tape or otherwise cover the fittings so that moisture
does not get into the building or conduit in the interim.
The thru-base gas connector has male and female threads. The
male threads protrude above the basepan of the unit; the female
threads protrude below the basepan.
Check tightness of connector lock nuts before connecting gas
piping.
Install a
Attach a
3
/4-in. NPT street elbow on the thru-base gas fitting.
3
/4-in. pipe nipple with minimum length of 16-in.
(406 mm) (field-supplied) to the street elbow and extend it
through the access panel at the gas support bracket. (See
Fig. 22.)
15
Fig. 21 — Completing Installation of Thru-the-Base
GASKET
CONNECTOR
PLATE
ASSEMBLY
3
/4-in NPT
STREET
ELBOW
THRU-BASE
GAS FITTING
GAS
SUPPORT
BRACKET
9” (229mm) min
Union
Shut Off
Valve
Drip
Leg
Thru-Curb Adapter
Unit Base Rail
Drip
Leg
Shut Off
Valve
Union
Thru-Curb Adapter
Burner
Access
Panel
9” (229mm) min
Unit Base Rail
Other hardware required to complete the installation of the gas
supply line will include a manual shutoff valve, a sediment trap
(drip leg) and a ground-joint union. A pressure regulator valve
may also be required (to convert gas pressure from pounds to
inches of pressure). The manual shutoff valve must be located
within 6 ft (1.83 m) of the unit. The union, located in the final
leg entering the unit, must be located at least 9-in. (230 mm)
away from the access panel to permit the panel to be removed
for service. If a regulator valve is installed, it must be located a
minimum of 4 ft (1220 mm) away from the unit’s flue outlet.
Some municipal codes require that the manual shutoff valve be
located upstream of the sediment trap. See Fig. 23 and 24 for
typical piping arrangements for gas piping that has been routed
through the sidewall of the curb. See Fig. 25 for typical piping
arrangement when thru-base is used. Ensure that all piping
does not block access to the unit’s main control box or limit the
required working space in front of the control box.
Option
Fig. 22 — Gas Line Piping
Fig. 23 — Gas Piping
Fig. 24 — Gas Piping
Fig. 25 — Gas Piping Thru-Base Connections
16
Loading...