Nibe Climate Master RGED Series User manual

92-106932-02-00
ST-A1273-32-00
INSTALLATION INSTRUCTIONS
FOR PACKAGE GAS ELECTRIC UNITS
RGED SERIES 7.5, 8.5, 10.0 & 12.5 TON [26.4, 29.9, 35.2 & 44.0 KW]
60 HZ MODELS
WITH R-410A REFRIGERANT
CONTENTS
A. Important Saftey and General Infromation ............................... 4
B. General Specifications ................................................................ 5
C. Installation of the Unit ................................................................. 11
D. Duct and Venting ......................................................................... 20
E. Electrical ....................................................................................... 27
F. Control/Thermostat Wiring .......................................................... 31
G. Gas ................................................................................................ 34
J. Startup and Operation ................................................................. 47
K. Test and Balance ......................................................................... 55
M. Humidity Control ......................................................................... 56
N. Diagnostics .................................................................................. 59
P. Appendices ................................................................................... 75
A - General Product Data .............................................................. 75
B - Electrical Data .......................................................................... 78
C - Air Flow Performance Data ..................................................... 89
D - Heat & Cool Performance Data ............................................... 97
E - Gas Heat Performance Data .................................................... 116
F - Refrigerant Charging Charts .................................................... 117
G - Wiring Diagrams & Schematics ............................................... 125
R.
Information for the Owner .......................................................... 156
S.
Installation Check List and Job Site Sheet ...............................
157

2
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3
CONTENTS (DETAILED)
A. Important Saftey and General Infromation ................................ 4
A.1. Important Saftey and General Information ........................................... 4
A.2. Agency Performance Audit and Efficiency Testing Notice ................... 4
A.3. Importance of a Quality Installation ..................................................... 4
A.4. Importance of Air Flow and Setup ....................................................... 4
A.5. Checking Product and Inspection ........................................................ 4
B. General Specifications .............................................................. 5
B.1. Saftey Warnings ................................................................................... 5
B.2. Major Components .............................................................................. 6
B.3. Product Data Information ..................................................................... 6
C. Installation of the Unit ............................................................... 11
C.1. General ................................................................................................. 11
C.2. Tool and Refrigerant ............................................................................. 11
C.3. Choosing a Location ............................................................................ 12
C.4. Setting the Unit .................................................................................... 14
C.5. Installing Condensate Drain ................................................................. 19
C.6. Final Installation Inspection .................................................................. 20
D. Duct and Venting ....................................................................... 20
D.1. Air Flow and Static Pressure ................................................................ 20
D.2. Duct Requirements and Best Practices ............................................... 20
D.3. Filters .................................................................................................... 21
D.4. Economizers and Fresh Air Dampers .................................................. 23
D.5. Smoke Detectors ................................................................................. 26
E. Electrical ................................................................................... 27
E.1. Electrical Saftey Information ................................................................ 27
E.2. Electrical Data ...................................................................................... 29
E.3. Electrical Connections .......................................................................... 29
F. Control/Thermostat Wiring ......................................................... 31
F.1. T-Stat Field Connections ....................................................................... 31
F.2. Routing Control Wiring .......................................................................... 33
F.3. Measuring Control Voltage Loads ......................................................... 33
G. Gas ............................................................................................ 34
G.1. Gas Piping Requirements .................................................................... 34
G.2. Procedure: Connecting Gas Lines to Gas Valve ................................. 38
G.3. LP Conversion ..................................................................................... 39
G.4. Operation and Testing ......................................................................... 40
J. Startup and Operation ............................................................... 47
J.1. Final Inspection ..................................................................................... 47
J.2. Turning on Power for the First time ...................................................... 47
J.3. Checking and Adjusting Air Flow ......................................................... 48
J.4. Checking Cooling Operation ................................................................ 50
J.5. Checking Heating Operation ................................................................ 52
K. Test and Balance ....................................................................... 55
K.1 Air Flow Charts and Information ........................................................... 55
K.2. Air Flow Adjustments ........................................................................... 55
M. Humidity Control ....................................................................... 56
M.1. Dehumidification System Information ................................................. 56
M.2. Humidity Sensor Installation ................................................................ 57
M.3. Humidity Control Settings and Configuration ..................................... 58
N. Diagnostics ................................................................................ 59
N.1. Diagnostics Chart ................................................................................. 59
N.2. Alarm Codes - Full List ........................................................................ 60
N.3. Common Mistakes ............................................................................... 74
P. Appendices ................................................................................ 75
Appendix A - General Product Data ....................................................... 75
Appendix B - Electrical Data ................................................................... 78
Appendix C - Air Flow Performance Data .............................................. 89
Appendix D - Heat & Cool Performance Data ........................................ 97
Appendix E - Gas Heat Performance Data ............................................. 116
Appendix F - Refrigerant Charging Charts ............................................. 117
Appendix G - Wiring Diagrams & Schematics ........................................ 125
Appendix J - Unit Tie-Down .................................................................... 157
R. Information for the Owner ......................................................... 162
S. Installation Check List and Job Site Sheet ........................................ 165
R.2 Product Model and Serial Number ................................................... 169
S. Installation Check List and Job Site Sheet ............................... 170

4
A. IMPORTANT SAFETY AND GENERAL INFORMATION
A.1 Introduction
This booklet contains the installation and operating
instructions for your 7.5 ton, 8.5 ton, 10 ton, or 12.5
ton combination gas heating/electric cooling unit.
There are some precautions that should be taken
to ensure proper operation. Improper installation
can result in unsatisfactory operation or dangerous
conditions.
Read this booklet and any instructions packaged
with separate equipment required to make up the
system prior to installation. Give this booklet to the
owner and explain its provisions. The owner should
retain this booklet for future reference.
WARNING: The manufacturer’s warranty
does not cover any damage or defect to the air
conditioner caused by the attachment or use of any
components, accessories or devices (other than
those authorized by the manufacturer) into, onto or
in conjunction with the air conditioner.
You should be aware that the use of unauthorized
components, accessories or devices may adversely
affect the operation of the air conditioner and may
also endanger life and property. The manufacturer
disclaims any responsibility for such loss or
injury resulting from the use of such unauthorized
components, accessories or devices.
A.2 Agency Performance Audit
and Efciency Testing Notice
NOTICE: BREAK-IN PERIOD
Prior to agency testing, run the compressor for
16 hours at 115of outdoor ambient temperature
and 80odry bulb / 75owet bulb indoor ambient
temperature.
NOTICE: EFFICIENCY TESTING NOTICE
For purposes of verifying or testing efciency
ratings, the test procedure in title 10 Appendix
M to Subpart B of Part 430 (Uniform Test
Method for Measuring the Energy Consumption
of Central Air Conditioners and Heat Pumps)
and the clarifying provisions provided in the
standards listed below that were applicable at
the date of manufacture should be used for test
set up and performance.
SETUP
• ASHRAE 37 - 2009 (RA 2019)
PERFORMANCE:
• ANSI/ASHRAE 90.1:
o 2013 for ZT models and some ZS models
o 2007 for ZR models and some ZS models
• ANSI/ASHRAE 103 (2017)
• AHRI Operations for Unitary Large AC
Equipment 340/360 (2015)
• CSA Z21.47 (2016)
SAFETY
UL 1995 5th Edition
CSA Z21.47 (2016)
A.3. Importance of a Quality
Installation
Optimal system performance and longevity
depend upon a quality and proper installation.
Failure to properly setup and commission this
unit could result in undesirable operation and
subsequent faults and potential failures.
Carefully follow all guidelines listed in the manual
and industry best practices. Conform to all local
code requirements. Contact your local technical
representative with any questions or concerns.
A.4. Importance of Air Flow
and Setup
Optimal system performance is also dependent
upon having the ideal airow across the
condensing and evaporating coils, and upon
matching the charge weight to the manufacturer’s
spec for the unit. Improper or restricted air
ow, and incorrect charge weight, will hinder
the performance of the unit. Please refer to the
manufacturer’s recommended clearances for
setting the unit and the included guide for setting
air ow. Refer to the rating plate for the charge
weight.
A.5. Checking Product and
Inspection
Upon receiving the unit, inspect it for any
damage from shipment. Claims for damage,
either shipping or concealed, should be led
immediately with the shipping company.
IMPORTANT: Check the unit model number,
heating size, electrical characteristics, and
accessories to determine if they are correct.

5
B.1 Safety Warnings
B. GENERAL SPECIFICATIONS
WARNING: Use only with type of gas
approved for this unit. Refer to the unit rating plate.
WARNING: Install this unit only in a
location and position as specied in the location
requirements and considerations section of these
instructions. Provide adequate combustion and
ventilation air to the unit space as specied in the
venting section of these instructions.
WARNING: Provide adequate combustion
and ventilation air to the unit space as specied in
the combustion and ventilation air section of these
instructions.
WARNING: Combustion products must be
discharged outdoors. Refer to local building codes
for ducting combustion exhaust.
WARNING: Never test for gas leaks with
an open ame. Use a commercially available soap
solution made specically for the detection of leaks
to check all connections, as specied in gas supply
and piping section of these instructions.
WARNING: Always install unit to operate
within the unit’s intended temperature-rise range
with a duct system which has an external static
pressure within the allowable range, as specied in
ducting section of these instructions. See also unit
rating plate.
WARNING: When a unit is installed so
that supply ducts carry air circulated by the unit
to areas outside the space containing the unit, the
return air shall also be handled by duct(s) sealed to
the unit casing and terminating outside the space
containing the unit.
WARNING: This unit may be used to
heat the building or structure during construction
if the following installation requirements are
met. Installation must comply with all installation
instructions including:
• Furnace operating under thermostatic control;
• Return air duct sealed to the furnace;
• Air lters in place;
• Set furnace input rate and temperature rise per
rating plate marking;
• Return air temperature maintained between 55°f
(13°c) and 80°f (27°c);
• Clean furnace, duct work and components upon
substantial completion of the construction process,
and verify furnace operating conditions including
ignition input rate, temperature rise and venting,
according to the instructions.

6
B.3. Product Data Information
B.3.1. Dimensional Information
B. GENERAL SPECIFICATIONS
IMPORTANT: This unit must be mounted
level in both directions to allow water to drain
from the condenser section and condensate
pan.
ST-A1273-01_B-00
89”
[2261 mm]
57 7/8”
[1470 mm]
ACCESS PANEL
HEAT EXCHANGER
ACCESS PANEL
BLOWER
ACCESS PANEL COMPRESSOR
CONTROL ACCESS
150 MODEL
60”
[1524 mm]
090 THRU 120
MODELS
50”
[1270 mm]
RETURN COVER
SUPPLY COVER
DRAIN PAN
FLUE
OUTLET
GAS ENTRY
(SIDE SUPPLY)
SERVICE DISCONNECT
KNOCKOUT
7 5/8”
[196 mm]
38 1/8”
[967 mm]
B.2. Major Components
The unit includes a hermetically-sealed
refrigerating system consisting of a scroll
compressor, condenser coil, evaporator coil
with TXV, a circulation air blower, a condenser
fan, a heat exchanger assembly, gas burner
and control assembly, combustion air motor
and fan, and all necessary internal electrical
wiring. The cooling system of these units is
factory evacuated, charged, and performance
tested. Refrigerant amount and type are
indicated on rating plate.

7
B.3. Product Data Information
B.3.1. Dimensional Information (Cont.)
B. GENERAL SPECIFICATIONS
IMPORTANT: This unit must be mounted
level in both directions to allow water to drain
from the condenser section and condensate
pan.
ST-A1273-01_D-00
SERVICE
PORT
DOOR
POWER
ENTRY
RECEPTACLE
29 1/4”
[743 mm]
32 3/4”
[832 mm]
90 1/8”
[2289 mm]
59 1/2”
[1511 mm]
3 3/4”
[97 mm]
FILTER
A
CCESS PANEL
INDOOR COIL
A
CCESS PANEL
4 1/4”
[110 mm]
B.3.2. Product Specications
The packaged Gas Electric rooftop unit is
available with 150k, 205k, and 225k BTUHs
heating input (either factory installed or eld
installed). Cooling capacity is 7.5, 8.5, 10, and
12.5 nominal tons. Units are convertible from
horizontal supply/return to bottom supply/return
by relocation of supply/return cover panels.
See section C.3.5. Cover Panel Installation/
Conversion Procedure for more details.
The units are weatherized for mounting outside
of the building.
WARNING: Units are not design
certied to be installed inside the structure.
Doing so can cause inadequate unit
performance as well as property damage or
death.

8
B. GENERAL SPECIFICATIONS
B.3. Product Data Information
B.3.3. General Data
See Appendix A towards the end of this manual for General Data.
B.3.4. Electrical Data Reference
See Appendix B towards the end of this manual for Electrical Data.
B.3.5. Air Flow Performance Data
See Appendix C towards the end of this manual for Air Flow Performance Data.
B.3.6. Supply and Return Duct Dimensions
55 3/8”
[1407 mm]
59 1/2”
[1511 mm]
14”
[356 mm]
26 3/4”
[679 mm]
59 1/8”
[1507 mm]
6 1/2”
[165 mm]
6 5/8”
[321 mm]
5 1/2”
[140 mm]
28 1/2”
[724 mm]
6 3/8”
[162 mm]
36 3/8”
[924 mm]
86 3/4”
[2203 mm]
90 1/8”
[2289 mm]
14 3/8”
[366 mm]
37 1/2”
[954 mm]
ST-A1273-01_A-00
9,;<95(09
:<773@
(09
2”
[51 mm]
TYP. (3) SIDES
1 3/8”
[35 mm]
(VIEW FROM BOTTOM LOOKING UP)
1 3/8”
[35 mm]
Figure B.3.6. - A: Supply And Return Dimensions For Downow Applications (Bottom View Looking Up)

9
B. GENERAL SPECIFICATIONS
B.3.6. Supply and Return Duct Dimensions
Figure B.3.6. - B: Supply And Return Dimensions For Horizontal Applications
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10
B. GENERAL SPECIFICATIONS
B.3. Product Data Information
B.3.7. Curb Dimensions
NOTE: See section C.3.3. Rooftop Installation
for more information for installing the unit on a
curb.
GASKET
Illustration
ADS-106190-01
14
[355.6 mm]
403/16
[1021 mm]
1513/16
[401.6 mm]
311/2
[800 mm]
213/8
[542.9 mm]
151/2
[394 mm]
853/8
[2168.5 mm]
531/2
[1358.9 mm]
Figure B.3.7. – A: Roofcurb Complete Assembly

11
C. INSTALLATION OF THE UNIT
C.1. General
C.1.1. Installation
Install this unit in accordance with local and
national standards. Any and all work must be
done by authorized personnel.
C.1.2. Pre-Installation Checkpoints
Before attempting any installation, carefully
consider the following points:
• Structural strength of supporting members
(Rooftop Installation)
• Clearances and provision for servicing
• Power supply and wiring
• Gas supply and piping
• Air duct connections and sizing
• Drain facilities and connections
• Location for minimum noise and vibration -
away from bedroom windows
C.2. Tool and Refrigerant
C.2.1. Tools Required for Installing
and Servicing R-410A Models
Manifold Sets:
• Up to 800 PSIG High Side
• Up to 250 PSIG Low Side
• 550 PSIG Low Side Retard
Manifold Hoses:
• Service Pressure Rating of 800 PSIG
• Zero-loss ttings
Recovery Cylinders:
• 400 PSIG Pressure Rating
Dept. of Transportation
• 4BA400 or BW400
C.2.2. Specications of R-410A
All units are factory charged with R-410a
Refrigerant.
Combustibility: At pressures above 1
atmosphere, mixture of R-410A and air can
become combustible. R-410A and air should
never be mixed in tanks or supply lines, or
be allowed to accumulate in storage tanks.
Leak checking should never be done with a
mixture of R-410A and air. Leak checking can
be performed safely with nitrogen or a mixture
of R-410A and nitrogen.
C.2.3. Quick Reference Guide for
R-410A
Ensure that servicing equipment is designed
to operate with R-410A.
• R-410A refrigerant cylinders are pink.
•R-410A, as with other HFC’s is only
compatible with POE oils.
• Vacuum pumps will not remove moisture from
POE oil.
•R-410A systems are to be charged with
liquid refrigerants.
•Do not install a suction line lter drier in the
liquid line.
•A liquid line lter drier is standard on every
unit.
•Desiccant (drying agent) must be compatible
for POE oils and R-410A.
C.2.4. Evaporator Coil/TXV
The thermostatic expansion valve is specically
designed to operate with R- 410A. The existing
evaporator must be replaced with the factory
specied TXV evaporator specically designed
for R-410A.
WARNING: Disconnect all power to unit
before starting maintenance. Failure to do so
can cause electrical shock resulting in personal
injury or death. Regular maintenance will reduce
the buildup of contaminants and help to protect
the unit’s nish.

12
C.3. Choosing a Location
C.3.1.Unit Location: Allowable
Clearances and Operational Issues
The unit location must comply with the allowable
clearances listed in Figure C.3.1. - A. Failure to
comply with the recommended clearances may result
in operational issues such as decreased capacity,
restricted condenser airow, and condenser motor
fatigue.
Figure C.3.1. - A: Allowable Clearances
C.3.2. Outside Installation
WARNING: These units are designed certied
for outdoor installation only. Installation inside any part
of a structure can result in inadequate unit performance
as well as property damage. Installation inside can also
cause recirculation of ue products into the conditioned
space resulting in personal injury or death.
1. Select a location where external water drainage
cannot collect around unit.
2. Provide a level slab sufciently high enough above
grade to prevent surface water from entering the unit
3. Locate the unit to provide proper access for
inspection and servicing as shown in Figure C.3.1. -
A.
4. Locate unit where operating sounds will not
disturb owner or neighbors.
5. Locate unit so roof runoff water does not pour
directly on the unit. Provide gutter or other shielding
at roof level. Do not locate unit in an area where
excessive snow drifting may occur or accumulate.
6. Where snowfall is anticipated, the height of the
unit above the ground level must be considered.
Mount unit high enough to be above anticipated
maximum area snowfall and to allow combustion air
to enter the combustion air inlet.
7. Select an area which will keep the areas of the
vent, air intake, and A/C condenser ns free and
clear of obstructions such as weeds, shrubs, vines,
snow, etc. Inform the user accordingly.
C.3.3. Rooftop Installation
1. Before locating the unit on the roof, make
sure that the roof structure is adequate to
support the weight involved. (See Electrical &
Physical Tables in this manual.) THIS IS VERY
IMPORTANT AND IS THE INSTALLER’S
RESPONSIBILITY.
2. For rigging and roofcurb details, see section
C.4.3.
3. The location of the unit on the roof should be
such as to provide proper access for inspection
and servicing.
IMPORTANT: If unit will not be put into service
immediately, block off supply and return air
openings to prevent excessive condensation.
C.3.4. Corrosive Environments
The metal parts of this unit may be subject to rust or
deterioration in adverse environmental conditions. This
oxidation could shorten the equipment’s useful life. Salt
spray, fog or mist in seacoast areas, sulphur or chlorine
from lawn watering systems, and various chemical
contaminants from industries such as paper mills and
petroleum reneries are especially corrosive.
If the unit is to be installed in an area where
contaminants are likely to be a problem, give special
attention to the equipment location and exposure.
1. Avoid having lawn sprinkler heads spray directly on
the unit cabinet.
2. In coastal areas, install the unit on the side of the
building away from the waterfront.
3. In some situations, fencing or shrubs may give some
protection against contaminants. Be mindful of the
allowable clearances.
4. Frequent washing of the cabinet, fan blade and coil
with fresh water will remove most of the salt or other
contaminants that build up on the unit.
5. Regular cleaning and waxing of the cabinet with an
automobile polish will provide some protection.
6. A good liquid cleaner may be used several times a
year to remove matter that will not wash off with water.
Several different types of protective coatings are
offered in some areas. These coatings may provide
some benet, but the effectiveness of such coating
materials cannot be veried by the equipment
manufacturer. The best protection is frequent cleaning,
maintenance and minimal exposure to contaminants.
C. INSTALLATION OF THE UNIT
ST-A1273-19-00
&
$
%
'
(
48 [1219]
24 [609]
48 [1219]
24 [609]
60 [1524]
A - FRONT
B - CONDENSER END
C - DUCT END
*D - FILTER SIDE
E - ABOVE
5(&200(1'('
&/($5$1&(,Q>PP@ /2&$7,21
&/($5$1&(6
THE FOLLOWING MINIMUM CLEARACES MUST
BE OBSERVED FOR PROPER UNIT PERFOMANCE
AND SERVICEABLILITY.
1
2
18” [457 mm] MINIMUM IF DRAINPAN
WILL NOT BE REMOVED.
48” [1219 mm] MINIMUM IF ECONOMIZER IS INSTALLED.
2
1

13
C. INSTALLATION OF THE UNIT
SEE DETAIL A
ST-A1291-29-00
COVER SOULD BE
FIRMLY SECURED IN TABS
ON BASEPAN BEFORE
APPLYING SCREWS.
DETAIL A
ST-A1291-30-00
DETAIL A
COVER SOULD BE
FIRMLY SECURED IN TABS
ON BASEPAN BEFORE
APPLYING SCREWS.
SEE DETAIL A
Figure C.3.5. – A: Downow to Horizontal Conversion
C.3.5. Cover Panel Installation/Conversion Procedure
SECURE COVER(S) WITH
SCREWS ALONG THE
FRONT AND SIDE FLANGES
SEE DETAIL VIEW SUPPLY OR
RETURN COVER
INSULATION
BASERAILS
SIDE
PANELS
ST-A1291-31-00 BASEPAN
SUPPLY OR
RETURN COVER
BASEPAN
DETAIL VIEW
INSIDE EDGE OF COVER
FITS UNDER FASTING TAB
FROM DOWNFLOW TO HORIZONTAL
1. Remove the covers from the supply and return openings on the unit. See Figure B.3.6. – B for reference.
2. Install the covers over the supply and return openings in the basepan, painted side up, inserting the leading ange under the
bracket provided. Place the back ange to top of the front bracket provided. See Figure C.3.5. –A for reference.
3. Secure the return and supply cover to front bracket with screws.

14
C.4.Setting the Unit
C.4.1. Removing Shipping material
There will be three types of shipping material that will need to be removed: The wood board
basepan protection underneath, the wooden skid on the top, and the condenser coil protection (on
non-louver panel units).
•Wood Board Basepan Protection – Remove the screws that attach the metal brackets for each
of the forklift fork-entry points, and remove the brackets. This will release the protection boards from
underneath, and it may be removed when the unit is lifted.
• Shipping Screws – Shipping screws are type #2 square head screws.
Figure C.4.1. – A: Basepan Protection Assembly
ST-A1273-48-00
BASEPAN FORKLIFT
PROTECTION
(2) #2 SQUARE HEAD SCREWS EACH AT
EACH FORK ENTRY; (12) SCREWS TOTAL
C. INSTALLATION OF THE UNIT

15
on the roof to provide extra protection if spreader bars are not used.
Figure C.4.1. – A: Wooden Skid Assembly
C. INSTALLATION OF THE UNIT
ST-A1273-47-00
SHIPPING BRACKET CATCH
IUQER)2)2( RED
ESWERCS)2)2( ACH
SHIPPING BRACKET
IUQER)2)2( RED
ESWERCS)2)2( ACH
• Wooden Skid – Remove the screws from the metal brackets located in the middle along both long
sides of the unit. This will detach the two sections of the wooden skid and allow them to be lifted off.
If the unit is to be lifted by a crane, it is recommended to leave the top skid on until after the unit is

16
C. INSTALLATION OF THE UNIT
• Condenser Coil Protection – Remove the screws along the perimeter of the coil protector. This
will allow the protector to be removed. If the unit has louver panels, it will not have the condenser
coil protection.
Figure C.4.1. – C: Condenser Coil Protection Assembly
ST-A1273-49-00
COIL COVER RETAINER
(2) REQUIRED
(3) SCREWS
EACH SIDE
COIL COVER
FOR UNITS NOT
WITH LOUVERS

17
C. INSTALLATION OF THE UNIT
C.4.2. Lifting the Unit
Figure C.4.2. – A : Lifting Detail
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18
C. INSTALLATION OF THE UNIT
C.4.3. On a Roof Curb
Refer to Figure C.3.1. - A in section C.3.1. “Unit Location: Allowable Clearances and Operational
Issues” before installing the unit on a roof curb.
Only use manufacturer-approved roofcurb products for the unit.
C.4.3.1. Installing the Roof Curb
Refer to the separate Installation Instructions for installing a roof curb. These instructions are listed
under these Manufacturer Part numbers:
• 14” and 21” Roofcurb: 92-107192-07
• Roofcurb Adapter: 92-107192-09
C.4.3.2. Setting the Unit
Figure C.4.3.2. - A: Setting the unit on Roofcurb Assembly
C.4.3.3. High Wind and Seismic Tie-Down Methods
The units must be secured in compliance with ASCE 7-10 and the Florida Building Code 5th Edition.
Please refer to Appendix J: Unit Tie-Down Methods.
C.4.4. On a slab
C.4.4.1. Setting the Unit
Set the unit on a stable concrete pad with adequate clearances around the sides of the unit, and
make sure the unit is level before securing.
Before setting/securing the unit, use this opportunity to convert the unit from a downflow
configuration to a sideflow configuration if necessary. Refer to section C.3.5. Cover Panel
Installation/Conversion Procedure.
C.4.4.2. High Wind and Seismic Tie-Down Methods
Slab-installed units must also be secured in compliance with ASCE 7-10 and the Florida Building
Code 5th Edition. Please refer to Appendix J: Unit Tie-Down Methods.

19
C.5. Installing Condensate Drain
IMPORTANT: Install a condensate trap to
ensure proper condensate drainage. See Figure
C.5.1 - A for reference.
The condensate drain pan has a threaded
female 3/4 inch NPT (11.5 TPI) connection.
Drain line must be no smaller than drain pan
outlet and adequately sized to accommodate
the condensate discharge from the unit. Drain
line must be routed to an acceptable drain
or outdoors in accordance with local codes.
Consult local codes or ordinances for specic
requirements of condensate drain piping and
disposal.
DO NOT connect condensate drain line to a
closed sewer pipe.
C.5.1. Determine Drain Trap Height
Requirement
The drain line should be a minimum of 3 inches
deep, plus 1 inch for every inch of external static
pressure from the blower and duct system. For
Example, if the external duct static is 1 inch of
water column, the drain trap from the bottom of
the trap to the bottom of the drain outlet should
be 4 inches, the drain outlet should be 3 inches
below the drain connection on the condensate
pan. Ensure the outlet of the trap is routed to a
suitable drain location as required by local code.
See Figure C.5.1 - A for reference.
C.5.2. Keeping the condensate drain
pan serviceable
To use the removable drain pan feature of this unit,
some of the condensate line joints should assembled
for easy removal and cleaning. Drain line MUST NOT
block service access panels.
C.5.3. Connecting the Drain trap
• Use a thin layer of Teon tape or paste on drain
pan connections and install only hand tight.
• Do not over tighten drain pan connections as
damage to the drain pan may occur.
• Drain line must be routed to an acceptable drain or
outdoors in accordance with local codes.
• Drain line should slope away from unit a minimum
of 1/8” per foot to ensure proper drainage.
C.5.4. Connecting the Drain to the
through the curb option
The through the curb drain option is available for
installations in freezing conditions or that do not
want water draining on the roof. Use adapters and
elbows to turn out of the drain opening on the right
and into the curb drain opening on the left. Under
the unit connect a ¾” male treaded tting, use
thread sealant, into the opening between the supply
and return duct openings under the unit. Install a
properly sized drain trap in the conditioned space of
the building and route to a suitable drain location as
code requires.
C. INSTALLATION OF THE UNIT
DO NOT OPERATE UNIT WITHOUT
CONDENSATE DRAIN TRAP INSTALLED
* External Static is the Sum of the Supply and Return Duct Static Pressure in Inches of Water Column
3-Inch Min.
3-Inch Min.
+
External Static*
DO NOT
OVER TIGHTEN
DRAIN FITTING
3/4” NPT Threaded
Connection to
Drain Line Opening
3/4” NPT Threaded
Connection to the
Through-the-Curb
Drain Line Option.
Leave Plugged
when not in use.
See instructions for details
Connections should
be no more than hand
tight plus one turn.
Position drain line
and fittings so as not
to interfere with panel
removal.
ST-A1291-13-00
Figure C.5.1 – A: Condensate Drain Tap 3/4” Male
3/4” Pipe
90° Elbow
90° Street
ST-A1273-71-00

20
C. INSTALLATION OF THE UNIT
C.5.5. Freezing Condition
considerations
• Drain line may need insulation or freeze protection
in certain applications.
• Drain line should slope away from unit a minimum
of 1/8” per foot to ensure proper drainage.
C.6. Final Installation Inspection
C.6.1. Remove Shipping Material
Before the unit is secured to the slab/roofcurb,
check that all shipping material has been
removed. See section C.4.1. for how to remove
shipping material.
NOTE: Failure to remove the condenser
coil protector on non-louver panel units will
negatively impact performance and be harmful
to system components. Failure to remove the
cardboard basepan protector will block all
indoor airow for downow congurations.
Open all compartments to ensure there are
no tools or other misc parts remaining in the
unit from setup. This is most important on the
blower section to avoid damage to the blower
assembly.
C.6.2. Checking Level and Slope
This unit must be mounted level in both
directions to allow water to properly drain from
the condenser section and condensate pan.
C.6.3. Condensation and Sweating
In certain regions or climates, portions of the
exterior of the unit may condensate or sweat
during cooling operation. This is normal and
expected.
C.6.4. Install Flue Hood for Gas Heat
These gas heat package units are shipped with
the ue hood fastened onto the condenser
basepan in the compressor access section.
Remove the ue hood from the basepan, and
install it over the ue opening on the outside of
the unit before operating.
D. DUCT AND VENTING
D.1. Air Flow and Static Pressure
See Appendix C towards the end of this
manual for Air Flow Performance Data. For Air
Flow adjustment and set up, see section J.3.
“Checking and Adjusting Air Flow”.
D.2. Duct Requirements and Best
Practices
The installing contractor should fabricate
ductwork in accordance with local codes.
Use industry manuals as a guide when sizing
and designing the duct system.
Contact Air Conditioning Contractors of
America, 1513 16th St. N.W., Washington, D.C.
20036.
WARNING: DO NOT, under any
circumstances, connect return ductwork to any
other heat producing device such as replace
insert, stove, etc. Unauthorized use of such
devices may result in re, carbon monoxide
poisoning, explosion, personal injury, property
damage or death.
Place the unit as close to the conditioned space
as possible allowing clearances as indicated. Run
ducts as directly as possible to supply and return
outlets. Use of non-ammable weatherproof
exible connectors on both supply and return
connections at unit to reduce noise transmission
is recommended.
On ductwork exposed to outside temperature
and humidity, use a minimum of 2” of insulation
and a vapor barrier. Distribution system in attic,
furred space or crawl space should be insulated
with at least 2” of insulation. Half-inch to 1” thick
insulation is usually sufcient for ductwork inside
the air conditioned space.
Provide balancing dampers for each branch duct
in the supply system.
Properly support ductwork from the structure.
IMPORTANT: In the event that the return air
ducts must be run through an “unconned”
space containing other fuel burning equipment,
it is imperative that the user/homeowner
must be informed against future changes
in construction which might change this to
a “conned space.” Also, caution the user/
homeowner against any future installation of
additional equipment (such as power ventilators,
clothes dryers, etc.), within the existing
unconned and/or conned space which might
create a negative pressure within the vicinity of
other solid, liquid, or gas fueled appliances.