Carrier WeatherMaster Installation Instructions
WeatherMaster
50GC**04-06
Single Package Rooftop Cooling Only/Electric Heat Unit
®
with Puron
(R-410A) Refrigerant
Installation Instructions
®
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ep 1 — Plan for Unit Location . . . . . . . . . . . . . . . . 7
St
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . 7
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . 7
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 9
• UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC
HEATERS
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 9
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required) . . . . . . . . . . . . . . . . . 10
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 11
• ECONOMIZER HOOD PACKAGE REMOVAL AND
SETUP (FACTORY OPTION)
• ECONOMIZER HOOD
Step 9 — Units with Hinged Panels Only . . . . . . . . 12
Step 10 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ep 11 — Make Electrical Connections . . . . . . . . . 12
St
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT OR HACR
• ALL UNITS
• CONVENIENCE OUTLETS
• HACR AMP RATING
• FACTORY OPTION THRU-BASE CONNECTIONS
• UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• FIELD CONTROL WIRING
• THERMOSTAT
• HEAT ANTICIPATOR SETTINGS
• ELECTRIC HEATERS
• HUMIDI-MIZER® CONTROL CONNECTIONS
• TYPICAL UNIT WIRING DIAGRAMS
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . . 24
• SYSTEM COMPONENTS
• SPECIFICATIONS
• INPUTS
• OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• S-BUS SENSOR WIRING
• CO2 SENSOR WIRING
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• TIME-OUT AND SCREENSAVER
• ENTHALPY SETTINGS
• STANDARD OR SINGLE SPEED FAN OPERATION
• 2 SPEED FAN OPERATION
• 2SP H/C AND 3 SPEED FAN OPERATION
• CHECKOUT
• TROUBLESHOOTING
RTU Open Controller (Factory Option) . . . . . . . . . .35
SystemVu™ Controller (Factory Option) . . . . . . . . .35
Controller Options . . . . . . . . . . . . . . . . . . . . . . . . . . .35
• LOW AMBIENT
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Step 12 — Adjust Factory-Installed Options . . . . . .37
• SMOKE DETECTORS
• ECONOMI$ER® IV OCCUPANCY SWITCH
Step 13 — Install Accessories . . . . . . . . . . . . . . . . .37
St
ep 14 — Fan Speed Set Up . . . . . . . . . . . . . . . . . .38
• UNITS WITH ELECTRO-MECHANICAL CONTROLS
• UNITS WITH SYSTEMVU™ CONTROLS
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards Institute) Z223.1. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguisher available for all brazing operations.
It is important to recognize safety information. This is the safetyalert 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.
Catalog No. 04-53500269-01 Printed in U.S.A. Form 50GC-4-6-03SI Rev. A Pg 1 3-21 Replaces: 50GC-4-6-02SI
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
DANGER
CAUTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning will result in 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
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury or
death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from
refrigerants and oils.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses and gloves
when handling parts and servicing air conditioning equipment.
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS
See Fig. 1 for 50GC model number nomenclature. See Fig. 2 for
unit dimensional drawings and service clearance dimensions.
Rated Indoor Airflow
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
MODEL NUMBER RATED INDOOR AIRFLOW (CFM)
50GC*N/M/P04 1200
50GC*N/M/P05 1400
50GC*N/M/P06 2000
2
50GC–M04A1 A5–0A0A 0
Cooling Tons
04 - 3 ton
05 - 4 ton
06 - 5 ton
1
Example:
Position: 2 3 4 5 6 7 8 9
10
11 12 13 14 15 16 17 18
Heat Options
–
= No Heat
A = Low Electric Heat
B = Medium Electric Heat
C = High Electric Heat
Sens or Options
A = None
B = RA (Return Air) Smoke Detector
C = SA (Supply Air) 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
J = Condensate Overflow Switch
K = Condensate Overflow Swtich and RA Smoke Detectors
L = Condensate Overflow Switch and RA and SA Smoke
Detectors
M = Condensate Overflow Swtich and SA Smoke Detectors
Indoor Fan Options
1 = Direct Drive
– EcoBlue – Standard Static
2 = Direct Drive
– EcoBlue – Medium Static
3 = Direct Drive
– EcoBlue – High Static
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
3 = 208-230/1/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
– = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical controls - can be used with
field-installed W7212 EconoMi$er
®
IV
(Non-Fault Detection and Diagnostic)
2 = RTU Open Multi-Protocol Controller
3 = SystemVu™ Controller
6 = Electro-mechanical - can be used with W7220
EconoMi$er X
(with Fault Detection and Diagnostic)
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
U = Temperature Ultra Low Leak Economizer w/
Barometric Relief
W = Enthalpy Ultra Low Leak Economizer w/
Barometic 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
6 = MERV 8 Filters
C = Foil Faced Insulation
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Breaker
C = Non-Fused Disconnect (NFD)
D = Thru-The-Base Connections (TTB)
E = HACR and Thru-The-Base Connections
F = Non-Fused Disconnect and TTB
N = Phase Monitor Protection
P = Phase Monitor and HACR
Q = Phase Monitor and NFD
R = Phase Monitor and TTB
S = Phase Monitor and HACR and TTB
T = Phase Monitor and NFD and TTB
Refrig. Systems Options
M = Two Stage Cooling Models
N = Two Stage Cooling Models with Humidi-MiZer
®
system (includes Low Ambient control)
P = Two Stage Cooling Models with
Low Ambient control
Note: On single phase (-3 voltage code) models, the
following are not available as factory-installed options:
- Humidi-MiZer
®
System
- Coated Coils or Cu Fin Coils
- Louvered Hail Guards
- Economizer
- Powered 115 Volt Convenience Outlet
Model Series - WeatherMaster
®
GC - 16.1 SEER Efficiency
Unit Heat Type
50 - Electric Heat
Packaged Rooftop
Fig. 1 — 50GC 04-06 Model Number Nomenclature (Example)
3
4
Fig. 2 — 50GC 04-06 Unit Dimensional Drawing
5
Fig. 2 — 50GC 04-06 Unit Dimensional Drawing (cont)
6
Fig. 2 — 50GC 04-06 Unit Dimensional Drawing (cont)
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Elec-
trical 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 the minimum clearances required for safety (including clearance to combustible surfaces), unit performance and
service access below, around and above unit as specified in unit
drawings. See Fig. 2 on page 5.
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 or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water
from higher level runoff and overhangs to fall onto unit.
Select a unit mounting system that provides adequate height to al-
low installation of condensate trap per requirements. Refer to
Step 10 — Install External Condensate Trap and Line on page 12
for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 2.
Table 2 — Operating Weights
50GC-*
Base Unit 468 (212) 510 (231) 555 (252)
Economizer
Vertical 50 (23) 50 (23) 50 (23)
Horizontal 80 (36) 80 (36) 80 (36)
Humidi-MiZer
Cu Fins 25 (11) 43 (20) 56 (25)
Powered Outlet 32 (15) 32 (15) 32 (15)
Curb
14-in. (356 mm) 110 (50) 110 (50) 110 (50)
24-in. (610 mm) 145 (66) 145 (66) 145 (66)
®
System 27 (10) 34 (13) 34 (13)
UNIT LB (KG)
04 05 06
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 10 — Install External
Condensate Trap and Line on page 12 for details)
5. Rig and place unit
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 the sequence 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. 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. 3.
Assemble and install accessory roof curb in accordance with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to function
properly. Unit leveling tolerances are shown in Fig. 4. Refer to
Accessory Roof Curb Installation Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb and not to the unit. The
accessory thru-the-base power connection package must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the basepan,
attach the accessory thru-the-base service connections to the basepan in accordance with the accessory installation instructions.
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. 3. Improperly applied gasket can also result in air leaks and
poor unit performance.
7
ROOF CURB
ACCESSORY #
CRRFCURB001A01
[137.7]
5.42"
A
14"
[356]
24"
[610]
11.96"
[303.8]
NOTES:
1. ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED.
2. INSULATED PANELS: 25.4 [1"] THK. POLYURETHANE FOAM, 44.5 [1-3/4] # DENSITY.
3. DIMENSIONS IN [ ] ARE IN MILLIMETERS.
4. ROOFCURB: 18 GAGE STEEL.
5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB).
6. SERVICE CLEARANCE 4 FEET ON EACH SIDE.
7. DIRECTION OF AIR FLOW.
8. CONNECTOR PACKAGE CRBTMPWR001A01 IS FOR THRU-THE-CURB GAS TYPE
PACKAGE CRBTMPWR003A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.
CONNECTOR PKG. ACC. GAS CONNECTION TYPE GAS FITTING
CRBTMPWR001A01 3/4" [19] NPT
CRBTMPWR003A01 THRU THE BOTTOM
1-3/4"
[44.5]
1.00"
[25.4]
THRU THE CURB
1/2" [12.7] NPTCRRFCURB002A01
11 3/4"[298.5] WIDE
INSULATED DECK PANELS
POWER WIRING
FITTING
3/4" [19] NPT
CONTROL WIRING
FITTING
1/2" [12.7] NPT 1/2" [12.7] NPT
ACCESSORY CONVENIENCE
OUTLET WIRING CONNECTOR
"A"
21.74"
[552.2]
4.96"
[126.0]
RETURN AIR
40.69"
[1033.5]
OPENING
16.03"
[407.2]
3.00"
[76.2]
13.78"
[350.0]
E
15.19"
[385.8]
8
14.00"
[355.6]
1.75"
[44.5]
1/4"
[7.0]
4 9/16"
[115.5]
3.00"
[76.2]
1/3/4"[44.5]
21.84"
[554.7]
SUPPLY AIR
OPENING
20.41"
[518.3]
SUPPLY AIR RETURN AIR
70.87"
[1800.2]
E
32.19"
[817.6]
(SUPPLIED WITH CURB)
OVERALL DIM. 5'-7 3/8" WAS 5'-7 7/8; 18GA
MATERIAL WA 16 GA.; NAIL FIELD SUPPLIED WAS
A
WITH CURB
VIEW "B"
CORNER DETAIL
GASKET
DUCT
(FIELD SUPPLIED)
UNIT
NAIL (FIELD SUPPLIED)
TYPICAL (4) SIDES
7/16"
[11]
COUNTER FLASHING
(FIELD SUPPLIED)
RIGID INSULATION
(FIELD SUPPLIED)
ROOFING FELT
(FIELD SUPPLIED)
CANT STRIP
(FIELD SUPPLIED)
ROOFING MATERIAL
(FIELD SUPPLIED)
E-ESECTION
SCALE 0.250
1-3/4"
[44.4]
"A"
8 9/16"[217.5] WIDE
INSULATED DECK PANEL
GAS SERVICE PLATE
THRU THE CURB
DRILL HOLE
2" [50.8] @
ASSEMBLY (IF
REQUIRED)
(SEE NOTE #8)
SUPPLY AIR
3'-1 3/16"
[944.6]
SEE VIEW "B"
DRAWING RELEASE LEVEL:
THIRD ANGLE
PROJECTION
ENGINEERING REQUIREMENTS
1067898--MMC04/22/13
SURFACE FINISH MFG/PURCH MODEL (INTERNAL USE ONLY) NEXT DRAWING SCALE DISTRIBUTION
ECN NO.APP'DCHK'DBYDATEREVISION RECORDREV
1' 4-13/16"
[427] INSIDE
RETURN AIR
1-3/4"
[44.5]
2-3/8"
[61]
5' 7-3/8"
[1711.3]
SEE NOTE #2
CERTIFIED DRAWING
PRODUCTION
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCES ON:
MATERIAL
-
-
-
T-005, Y-002
WEIGHT:
-
- PURCH - N/A MMC
1 DEC 2 DEC 3 DEC ANG
----
AUTHORIZATION NUMBER TITLE
1041738
ENGINEERING MANUFACTURING
-
MMC 06/17/11 - -
-
-
DRAFTER CHECKER
CURB ASY, ROOF
SIZE DRAWING NUMBER REV
-
48TC400427
D
SHEET 5 OF 5
1-3/4"
[44.4]
B
Fig. 3 — Roof Curb Details
A
B
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5 (13) 1.0 (25) 1.0 (25)
Fig. 4 — Unit Leveling Tolerances
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.
Step 5 — Field Fabricate Ductwork
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 dimensions
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.
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.
UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC HEATERS
All installations require a minimum clearance to combustible surfaces of 1-in. (25 mm) from duct for first 12-in. (305 mm) away
from unit.
Outlet grilles must not lie directly below unit discharge.
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal injury.
For vertical supply and return units, tools or parts could drop
into ductwork and cause an injury. Install a 90 degree turn in
the return ductwork between the unit and the conditioned
space. If a 90 degree elbow cannot be installed, then a grille of
sufficient strength and density should be installed to prevent
objects from falling into the conditioned space. Due to electric
heater, supply duct will require 90 degree elbow.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are required.
Rollers may be used to move unit across a roof. Rigging materials
under unit (cardboard or wood) must be removed PRIOR to placing the unit on the roof curb. Level by using unit frame as a reference. See Table 2 on page 7 and Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 5. Refer to
rigging instructions on unit.
Rigging materials under the unit (cardboard or wood to prevent
base pan damage) must be removed PRIOR to placing the unit on
the roof curb.
Before setting the unit onto the curb, recheck gasketing on curb.
.
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.
POSITIONING ON CURB
Position unit on roof curb so that the following clearances are
maintained:
the base rail inside the front and rear, 0.0-in. clearance between the
roof curb and the base rail inside on the duct end of the unit. This
will result in the distance between the roof curb and the base rail
inside on the condenser end of the unit being approximately
(6.4 mm).
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
After unit is in position, remove rigging skids and shipping
materials.
1
/4-in. (6.4 mm) clearance between the roof curb and
1
/4-in.
9
.
DETAIL "A"
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
SEE DETAIL "A"
"A"
(914-1371)
36"- 54"
"C"
"B"
SPREADER
BARS
REQUIRED
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
SCREWS
DUCT COVERS
SHEET METAL
FACE UP
BASEPAN
UNIT
50GC-*04 780 354 74.5 1890 35.5 900 33.5 850
50GC-*05 863 391 74.5 1890 35.5 900 33.5 850
50GC-*06 969 440 74.5 1890 35.0 890 41.5 1055
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.
MAX WEIGHT
lb kg in. mm in. mm in. mm
Fig. 5 — Rigging Details
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 side duct
opening covers (see Fig. 6) and remove covers. Use 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. 7 for position of the notches in the basepan. Seals around duct
openings must be tight. Secure with screws as shown in Fig. 8.
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.
DIMENSIONS
A B C
NOTCHES
BASEPAN
Fig. 7 — Location of Notches
NOTCHES
Fig. 6 — Horizontal Conversion Panels
10
Fig. 8 — Horizontal Duct Panels In Place
Step 8 — Install Outside Air Hood
HOOD PARTS
PLASTIC TIE WRAP
QTY (2)
SCREWS FOR
METAL TRAY
QTY (2)
ECONOMIZER HOOD PACKAGE REMOVAL AND SETUP (FACTORY OPTION)
NOTE: Economizer is not available as factory-installed options
for single phase (-3 voltage code) models.
The hood is shipped in knock-down form and must be field assembled. The indoor coil access panel is used as the hood top
while the hood sides, divider and filter are packaged together, attached to a metal support tray using plastic stretch wrap, and
shipped in the return air compartment behind the indoor coil access panel. The hood assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie-wraps.
1. To gain access to the hood, remove the filter access panel. See
Fig. 9.
FILTER ACCESS PANEL
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
Fig. 9 — Typical Access Panel Locations
2. Locate the (2) screws holding the metal tray to the basepan
and remove. Locate and cut the (2) plastic tie-wraps securing
the assembly to the damper. See Fig. 10. Avoid damaging any
wiring or cutting tie-wraps securing any wiring.
1. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of the
indoor coil access panel. See Fig. 11.
TOP
PAN EL
TOP
PAN EL
INDOOR
COIL
ACCESS
PAN EL
INDOOR
COIL
ACCESS
PAN EL
CAULK
HERE
Fig. 11 — Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the hood sides
under the panel (hood top). 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. 12.
TOP
PAN EL
INDOOR COIL
ACCESS PANEL
Fig. 10 — Economizer Hood Parts Location
3. Carefully lift the hood assembly (with metal tray) through the
filter access opening and assemble per the steps outlined in
the following section, “Economizer Hood”.
ECONOMIZER 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.
LEFT
HOOD
SIDE
19 1/16”
B
(483mm)
SCREW
HOOD DIVIDER
33 3/8”
(848mm)
Fig. 12 — Economizer Hood Construction
3. Remove the shipping tape holding the economizer barometric
relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See Fig. 12
and 13. Secure hood divider with 2 screws on each hood side.
The hood divider is also used as the bottom filter rack for the
aluminum filter.
5. Open the filter clips which are located underneath the hood
top. Insert the aluminum filter into the bottom filter rack
(hood divider). Push the filter into position past the open filter
clips. Close the filter clips to lock the filter into place. See
Fig. 13.
6. Caulk the ends of the joint between the unit top panel and the
hood top.
7. Replace the filter access panel.
11
To use the alternate bottom drain connection, remove the red drain
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
plug from the bottom connection (use a
1
/2-in. square socket drive
extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be com-
pleted after the unit is in place. See Fig. 16.
MINIMUM PITCH
1˝ (25 mm) PER
10´ (3 m) OF LINE
BASE RAIL
OPEN
VENT
3˝ (76 mm)
MIN
Fig. 13 — Economizer Filter Installation
Step 9 — Units with Hinged Panels Only
Relocate latch shipped inside the compressor compartment behind
the hinged compressor door to location shown in Fig. 14 after unit
installation.
If the unit does not have hinged panels, skip this step and continue
at Step 10 below.
COMPRESSOR
DOOR
OUTDOOR COIL
LATCH
Fig. 14 — Compressor Door Latch Location
Step 10 — Install External Condensate Trap and
Line
The unit has one 3/4-in. condensate drain connection on the end of
the condensate pan and an alternate connection on the bottom. See
Fig. 15. Unit airflow configuration does not determine which
drain connection to use. Either drain connection can be used with
vertical or horizontal applications.
Fig. 15 — Condensate Drain Pan (Side View)
When using the standard side drain connection, ensure that the red
plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan plug can be tightened with
1
a
/2-in. square socket drive extension.
TO ROO F
DRAIN
DRAIN PLUG
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap is recommended.
SEE NOTE
ROOF
CURB
Fig. 16 — Condensate Drain Pan Piping Details
All units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the
external trap, pitch the line away from the unit at 1-in. per 10 ft
(25 mm per 3 m) of run. Do not use a pipe size smaller than the
unit connection (
3
/4-in.).
Step 11 — Make Electrical Connections
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Unit cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC; ANSI/NFPA 70, latest
edition (in Canada, Canadian Electrical Code CSA [Canadian
Standards Association] C22.1), and local electrical codes.
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional powered convenience outlet, the power
source leads to the convenience outlet’s transformer primary are
not factory connected. Installer must connect these leads according to required operation of the convenience outlet. If an alwaysenergized convenience outlet operation is desired, connect the
source leads to the line side of the unit-mounted disconnect.
(Check with local codes to ensure this method is acceptable in
your area.) If a de-energize via unit disconnect switch operation of
the convenience outlet is desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unit-mounted
disconnect, connect the source leads to compressor contactor C
and indoor fan contactor IFC pressure lugs with unit field power
leads. See Convenience Outlets on page 15 for power transformer
connections.
The field power wires are connected to the unit at line-side pressure lugs on compressor contactor C and indoor fan contactor IFC
(see wiring diagram label for control box component
12
arrangement) or at factory-installed option non-fused disconnect
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
switch or HACR. Maximum wire size is #2ga AWG (copper only)
per pole on contactors, #2ga AWG (copper only) per pole on optional disconnect or HACR, and 4/0 AWG (copper only) per pole
on terminal or fuse blocks on units with single point box (see
Fig. 17). See Fig. 18 and unit label diagram for field power wiring
connections.
NOTE: Unit may be equipped with short test leads (pigtails) on
the field line connection points on contactor C or optional disconnect switch. These leads are for factory-run test purposes only; remove and discard before connecting field power wires to unit connection points. Make field power connections directly to line connection pressure lugs only.
UNITS WITH FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR
The factory-installed optional non-fused disconnect (NFD) or
HACR switch is located in a weatherproof enclosure located under the main control box. The manual switch handle and shaft are
shipped in the disconnect or HACR enclosure. Assemble the shaft
and handle to the switch at this point. Discard the factory test leads
(see Fig. 18).
Units Without Single Point Box, Disconnect or HACR Option
Equip
GR Lug
TB TB
11 12
Disconnect
per
NEC
208/230-1-60
Ground
(GR)
11 12 13
Disconnect
per
NEC
L1 L2 L3
208/230-3-60
460-3-60
575-3-60
Units With Disconnect or HACR Option
L1
L2
3 Phase Only 3 Phase Only
L3
2
Optional
Disconnect
4
6
Switch
1
3
5
Factory
Wiring
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
unit. Use only copper wire.
Fig. 17 — Disconnect Switch and Unit
Connect field power supply conductors to LINE side terminals
when the switch enclosure cover is removed to attach the handle.
Ground
(GR)
Disconnect factory test leads; discard.
Equip GR Lug
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
Single Point Box
L1
L2
L3
Ground (GR)
Terminal Block
Equip GR
Lug
— OR —
Single Point Box
L1
L2
L3
Ground (GR)
Fuse/Terminal Block
Fuse
Fuse
Fuse
Equip GR
Lug
Fig. 18 — Power Wiring Connections
Factory
Wiring
Factory
Wiring
Field-Install the NFD Shaft and Handle
1. Remove the Control Box access panel. The NFD enclosure is
located below the Control Box (see Fig. 19).
2. Remove (3) cap head screws that secure the NFD enclosure
front cover — (2) on the face of the cover and (1) on the left
side cover. See Fig. 20.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at OFF position (the arrow on the black handle knob is at OFF).
5. Insert the shaft with the cross pin on the top of the shaft in the
horizontal position. See Fig. 20.
13
6. Measure from the tip of the shaft to the top surface of the
black pointer; the measurement should be 3.75 to 3.88-in. (95
to 99 mm).
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow pointing
at OFF.
9. Install the handle on to the painted cover horizontally with the
red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws and
lock washers supplied.
11. Engaging the shaft into the handle socket, re-install (3) hex
screws on the NFD enclosure.
12. Re-install the unit front panel.
6. Tighten the locking screw to secure the shaft to the HACR.
7. Turn the handle to the OFF position with red arrow pointing
at OFF.
8. Install the handle on to the painted cover horizontally with the
red arrow pointing to the left.
9. Secure the handle to the painted cover with (2) screws and
lock washers supplied.
10. Engaging the shaft into the handle socket, re-install (3) hex
screws on the HACR enclosure.
11. Re-install the unit front panel.
Fig. 19 — NFD Enclosure Location
Fig. 20 — NFD Handle and Shaft Assembly
Field-Install the HACR Shaft and Handle
1. Remove the Control Box access panel. The HACR enclosure
is located below the Control Box (see Fig. 21).
2. Remove (3) cap head screws that secure the HACR enclosure
— (2) on the face of the cover and (1) on the left side cover.
See Fig. 22.
3. Remove the front cover of the HACR enclosure.
4. Make sure the HACR shipped from the factory is at OFF
position (the white arrow pointing at OFF).
5. Insert the shaft all the way with the cross pin on the top of the
shaft in the horizontal position. See Fig. 22.
Fig. 21 — HACR Enclosure Location
Fig. 22 — HACR Handle and Shaft Assembly
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR
When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. Disconnect sizing data
is provided on the unit informative plate. Locate on unit cabinet
or within sight of the unit per national or local codes. Do not
cover unit informative plate if mounting the disconnect on the
unit cabinet.
ALL UNITS
All field wiring must comply with NEC and all local codes. Size
wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 18 and the unit label diagram for power wiring connections to the unit power terminal blocks and equipment
ground. Maximum wire size is #2ga AWG (copper only) per pole
on contactors, #2ga AWG (copper only) per pole on optional disconnect or HACR, and 4/0 AWG (copper only) per pole on
14
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