CARRIER Package Units(both Units Combined) Manual L0811828
User Manual: CARRIER CARRIER Package Units(both units combined) Manual CARRIER Package Units(both units combined) Owner's Manual, CARRIER Package Units(both units combined) installation guides
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WEATHERMAKER ®
48A2,A3,A4,A5020-060
Single Package Gas Heating/Electric Cooling
Rooftop Units with COMFORTLINK TMControls
and PURON ® (R-410A) Refrigerant
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ......................
1
INSTALLATION ................................
1-35
Step 1 -- Provide Unit Support ...................
1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 -- Rig and Place Unit .....................
2
• POSITIONING
• ROOF MOUNT
Step 3 -- Field Fabricate Ductwork ...............
2
Step 4 -- Make Unit Duct Connections
...........
2
Step 5 -- Install Flue Hood ......................
17
Step 6 -- Trap Condensate Drain ................
17
Step 7 -- Install Gas Piping .....................
17
Step 8 -- Make Electrical Connections
..........
18
• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 9 -- Make Outdoor-Air Inlet
Adjustments ..................................
30
• ECONOMIZER AND FIXED OUTDOOR
AIR DAMPER
Step 10 -- Position Power Exhaust/Barometric
Relief Damper Hood ...........................
30
Step 11 -- Route VAV Static Pressure Sensor...
30
Step 12 --Install All Accessories ...............
32
Step 13 -- Field Modifications ...................
34
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 the 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. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User's Information
Manual provided with this unit for more details.
2.
Do not store or use gasoline or other flalmnable vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2.
DO NOT touch any electrical
phone in your building.
switch,
or use any
3.
IMMEDIATELY
call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
4.
If you cannot reach your gas supplier,
department.
call the fire
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).
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.
If service equipment is not rated for Puron refrigerant,
equipment damage or personal injury may result.
INSTALLATION
Step 1 -- Provide
Unit Support
1. All panels must be in place when rigging or damage
to unit may occur.
2.
Unit is not designed for handling
age to unit may occur.
by fork truck. Dam-
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04%3480051-01
Printed in U.S.A.
Form 48A-6SI
Pg 1
5-08
Replaces:
48A-4SI
ROOF CURB -- For vertical discharge units, assemble or install accessory roof curb in accordance
with instructions
shipped with this accessory. See Fig. 1-3. Install insulation,
cant strips, roofing, and counter flashing as shown. Ductwork
can be installed to roof curb before unit is set in place. Curb
should be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is shown in Fig. 1-3.
Refer to Accessory Roof Curb Installation Instructions
for
additional reformation as required. When accessory roof curb
is used, unit may be installed on class A, B, or C roof covering
material.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket with the roof
curb as shown in Fig. 1-3. Improperly applied gasket can
also result in air leaks and poor unit performance.
ALTERNATE UNIT SUPPORT -- When the preferred curb
or slab mount cannot be used, support unit with sleepers on perimeter, using unit curb support area. If sleepers cannot be
used, support long sides of unit (refer to Fig. 4-10) with a minimum number of 4-in. x 4-in. pads spaced as follows:
48A2,A3,A4,A5020-035
units require 3 pads on each side;
48A2,A3,A4,A5040-050
units require 4 pads on each side;
48A2,A3,A4,A5060
units require 6 pads on each side. Unit
may sag if supported by corners only.
Step 2 -- Rig and Place Unit -- Inspect
transportation
specifications.
unit
Do not drop unit; keep upright. Use spreader bars over unit
to prevent sling or cable damage. This unit must be handled
with a crane and can not be handled by a fork truck. Level by
using unit frame as a reference; leveling tolerance is shown in
Fig. 1-3. See Fig. 11 for additional information. Unit operating
weight is shown in Table 2.
NOTE: On retrofit jobs, ductwork may be attached to the old
unit instead of a roof curb. Be careful not to damage ductwork
when removing old unit. Attach existing ductwork to roof curb
instead of unit.
Four lifting lugs are provided on the unit base rails as shown
in Fig. 4-10. Refer to rigging instructions on unit.
POSITIONING
-- Maintain clearance, per Fig. 4-10, around
and above unit to provide minimum distance from combustible
materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contaminated
air. For proper unit operation, adequate combustion and ventilation air must be provided in accordance with Section 5.3 (Air
for Combustion
and Ventilation) of the National Fuel Gas
Code, ANSI Z223.1 (American National Standards Institute).
guard against
Ductwork
--
Secure all
ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
NOTE: Due to width of the horizontal supply and return ductwork, provisions should be made for servicing of the outdoor
air filters (i.e., catwalk over ductwork).
Ducts passing through an unconditioned
space must be insulated and covered with a vapor barrier. Outlet grilles must not
lie directly below unit discharge. The return duct must have a
90-degree elbow before opening into the building space if the
unit is equipped with power exhaust.
To attach ductwork to roof curb, insert duct approximately
10 to 11 in. up into roof curb. Connect ductwork to 14-gage
roof curb material with sheet metal screws driven from reside
the duct.
Follow AMCA (Air Movement and Control Association)
guidelines relating to ductwork connections to the unit. These
guidelines recolrunend a minflnum 21/2 equivalent duct diameters of straight duct connected to supply air inlet and outlet
openings before any transitions, fittings, dampers, etc. Failure
to adhere to these guidelines may result in system effects which
can impact the unit's ability to achieve published performance.
for
damage. See Tables 1-6 for physical data and
File any claim with transportation agency.
Although unit is weatherproof,
higher level runoff and overhangs.
Step 3 -- Field Fabricate
water from
Locate mechanical draft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building.
When unit is located adjacent to public walkways, flue assembly must be at least 7 ft above grade.
ROOF MOUNT -- Check building codes for weight distribution requirements. See Fig. 11. Unit operating weight is shown
in Table 2.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90-degree
elbow turn in the supply and return ductwork between the
unit and the conditioned space. Ifa 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.
Step 4 -- Make Unit Duct Connections
48A2 AND A3 UNITS -- Unit is shipped for through-thebottom duct connections. Field-fabricated
ductwork should be
attached to the roof curb. Supply and return duct dflnensions
are shown in Fig. 4-6. Air distribution is shown in Fig. 12.
Refer to installation instructions shipped with roof curb for
more reformation.
48A4 AND A5 UNITS -- Remove
shipping
covers from
supply and return air openings. Attach field-supplied ductwork
to unit. Connect to the unit with a single duct for all supply
openings and with a single duct for all return openings.
Splitting of the airflow into branch ducts should not be done at
the unit. Sufficient duct length should be used prior to branching to ensure the air temperatures
are well mixed within the
ductwork. See Fig. 7-9 for duct opening dimensions. Secure all
ducts to building structure. Air distribution is shown in Fig. 7-9
and Fig. 13.
Install accessory barometric relief or power exhaust in the
field-fabricated return ductwork. Refer to Step 10 -- Position
Power Exhaust/Barometric
Relief Damper Hood section on
page 30 for more information.
Instructions
continued
on page 17.
NOTES:
1,
Unless otherwise specified, all dimensions are to outside of part.
2.
Roof curb accessory CRRFCURBOO5AOO is shipped disassembled.
3.
All roof curb parts are to be 14 ga. galvanized steel,
4.
Dimensions in [] are in millimeters. All other dimensions are in inches.
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2.
3.
4.
3-7/16
Unless otherwise specified, all dimensions are to outside of part.
Roof curb accessory CRRFCURBOOGAO0 is shipped disassembled.
All roof curb parts are to be 14 ga. galvanized steel.
Dimensions in [] are in millimeters. All other dimensions are in inches.
i[ST]
I
16101
43-II16
[1094]
81-I14
_64 ]
[610]
NOTE:
TO PREVENT STANDING WATER IN THE DRAIN PAN OF THE
INDOOR SECTION,
AND THE HEAT EXCHANGERS
UNIT CAN ONLY BE PITCHED AS SHOWN,
I
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[2911]
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B
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TYP 4 SIDES
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-SEE DETAIL
STRIP
RIGID
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[3561
LEVELING TOLERANCES
,FROM EDGE OF UNIT
DETAIL
mm
INSULATIO
SUPPLIED)
Fig. 2 -- Roof Curb -- 48A2,A3040-050
Units
NOTES:
1.
Unless otherwise specified, all dimensions are to outside of part.
2.
Roof curb accessory CRRFCURBO14AO0 is shipped disassembled.
3.
All roof curb parts are to be 14 ga. galvanized steel.
4.
Dimensions in [] are in millimeters. All other dimensions are in inches.
43-1/16
[1094]
Bl-I/4
[2064]
24
[610]
NOTE:
TO PREVENT STANDING WATER IN THE DRAIN PAN OF THE
iNDOOR SECTION,
AND THE HEAT EXCHANGERS
UNIT CAN ONLY BE PITCHED AS SHOWN.
16940
[43F0]
308.64
[7839]
[3
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A
DEG
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R
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[44]
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D IMENS IONS
(DEGREES ARD INCHES)
mm
BEG
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mm
138
50
.TS
19
DETAIL
SCALE
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(721
5-9132
[134]
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UNIT LEVELING TOLERANCES
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[ 76]
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TYP 4 SIDES
DETAIL
ROOFING
(FIELD
FELT
SUPPLIED)
Fig. 3 -- Roof Curb -- 48A2,A3060
Units
Z
NOTES:
1.
Weights include economizer.
2.
_ center of gravit}L
3.
Unit clearances:
Top of units: no overhang
Condenser coil: 4' - 0" [1219]
Economizer side: 6' - 0" [1829]
Heat side: 4' - 0" [1219]
Filter access side: 10' - 0" [3048] (for
removal of evaporator coil)
4.
For smaller service and operational clearances, contact Carrier application engineering department.
5.
Bottom ducts are designed to be attached to
accessory roof curb. If unit is mounted on
dunnage, it is recommended that the ducts
be supported by cross braces as done on
accessory roof curb.
6.
Dimensions in [] are in millimeters. All other
dimensions are in inches.
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Fig. 4 -- Base Unit Dimensions -- 48A2,A3020-035
NOTES:
1,
Weights include economizer,
2.
_ center of gravity.
3,
Unit clearances:
Top of units: no overhang
Condenser coil: 4' - 0" [1219]
Economizer side: 6' - 0" [1829]
Heat side: 4'- 0" [1219]
Filter access side: 10' - 0" [3048] (for
removal of evaporator coil)
4.
For smaller service and operational clearances,
contact Carrier application engineering department,
5.
Bottom ducts are designed to be attached to accessory roof curb. If unit is mounted on dunnage,
it is recommended that the ducts be supported by
cross braces as done on accessory roof curb.
6.
Dimensions in [ ] are in millimeters. All other dimensions are in inches.
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weight
includes
largest
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modulating
power
exhaust
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air
frequency
drive
(variable
air volume
units).
microchannel
volume
units),
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and
FOR CENTERS OF GRAVITY,
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2.
@ center of gravity.
3• Unit clearances:
Top of units: no overhang
Condenser coil: 4' - 0" [1219]
Economizer side: 6' - 0" [1829]
Heat side: 4'- 0" [1219]
Filter access side: 10' - 0" [3048] (for
removal of evaporator coil)
4.
For smaller service and operational clearances,
contact Carrier application engineering department,
5.
Dimensions in [ ] are in millimeters. All other
dimensions are in inches.
2 9i6
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Fig. 7 -- Base Unit Dimensions -- 48A4,A5020-035
NOTES:
1.
Weights include economizer.
2.
@ center of gravity.
3.
Unit clearances:
Top of units: no overhang
Condenser coil: 4' - O" [1219]
Economizer side: 6' - O" [1829]
Heat side: 4' - O" [1219]
Filter access side: 10' - O" [3048] (for removal of
evaporator coil)
4.
For smaller service and operational clearances, contact
Carrier application engineering department,
5.
Dimensions in [ ] are in millimeters. All other dimensions
are in inches.
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microchannel
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heat
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7/8'
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ERiLLX CON RO BOX
/
ACCESS DOOR ( ZN6 D)
/
IN:(',OR
VO OR
A,';{ESS O00R (H N6
2:)0
':'AS
/
/
.
.
.
12 65
3?0 8]
:
97
177
T
)
786/
ii9971
6A] NP
NL R HOLE
i33
69
3396]
CAP
(F E_;)
INSTAL ED)
,_'?CESS
DOORS ([HOED)
, \ CONTROL BOX
COMPRESSOR
/
X
"
_
4 56
08/]
(01,,
oo5
1779]
r
i
i
: ....
AUX
IAR"
CONT;_0L
OX
, ......
._:
.....
.
i
,..:.
7/8"
DIA [P2]
_OW VO_'AOE
43
3
[1103!
/
_'_ 30 12 _4
[765i
TYP 4
:'LACES
88 00
[2235]
DIA[
IE!D
/ ,%0
[/90
49 53
[I _81
-
...................................................
BASE AI,/E
FASECTION
ACCESS ANEL
/4 8(:
36031
_85
09
[2 6 i
161 66
1/106]
31 l 28
7906
61
[23881
O]
OVERA_L LiFTINC
SHiPPiNG
DiV
Fig. 9 -- Base Unit Dimensions -- 48A4,A5060
LIP
iNC LUG
6]
WIRING
(2)
-805
2041
299_
[761
iN
iiE
8202
IR0831
BASE RAILS
[/i461
65
[/6i/-
91
i
-,sS
NOTES:
1.
Weights include economizer or outdoor air damper.
2.
_ center of gravity.
3.
Unit clearances:
Top of units: no overhang
Condenser coil: 4'- 0" [1219]
Economizer side: 6' - 0" [1829]
Heat side: 4' - 0" [1219]
Filter access side: 10' - 0" [3048] (for removal of evaporator
coil)
4.
For smaller service and operational clearances, contact Carrier
application engineering department.
5.
Bottom ducts are designed to be attached to accessory roof curb.
If unit is mounted on dunnage, it is recommended that the ducts
be supported by cross braces as done on accessory roof curb.
6.
Base unit weights include outdoor air hoods and filters (indoor fan
motor is not included). Add indoor fan motor, FlOPs, and accessories for total operating weight.
7.
VAV motor weights include indoor motor, VFD, VFD transducer,
and associated wiring•
8.
Dimensions in [] are in millimeters. All other dimensions are in
inches.
9.
For side-supply/return
applications, a single return and supply
ductwork connection is recommended for covering all three return and all three supply openings. The entire area around the
duct openings is available for a 1.5" duct flange attachment.
UX
T _,i]Olq-SL
S
(
{S
) il
UNIT SIZE
I,OT[{ 6)
OPERATING
WEIGHT*
(Ib)
CENTER
OF GRAVITY
(ft - in.)
A
B
CORNER
WEIGHTS
(Ib)
1
2
3
4
1693
2243
2541
] 60
48/\2D
A3D
'36(;
3205
•
i
48i28/A!@
3,36
48S4D,At,
48/\4E
OslZONS
MO[}
i,5E
SCCESSOTZES
B;,ROl,[
i\0"1
D
R C RE
NOD
30
3223}
'356
333
li'C [
EXI{AUST
1',4
• J
COl, i} CO£L
i
67_
il
2
5
i
2t
14- 9 5/8
3- 5 1/4
1909
48A2,A3 (E, N, T) 060
8626
14-23/8
3-31/4
2159
1745
2100
2622
48A4,A5
(D, M, S) 060
8426
14-15/8
3-91/4
1763
2072
2259
2333
48A4,A5 (E, N, T) 060
8676
13-71/4
3-71/4
2000
2126
2134
2417
OPERATING
WEIGHT*
(kg)
CENTER
UNIT SIZE
NOT£ 6 )
4<"
x
" i
E, AdbTI
*C",[R
8386
4)
7106
(SEE
EF
33
(D, M, S) 060
48A2,A3
_6
sO
306)
5_
g
CORNER
1
WEIGHTS
(kg)
2
3
4
(D, M, S) 060
3804
4514
1048
866
768
1017
1153
48A2,A3 (E, N, T) 060
3913
4329
997
979
792
953
1189
48A4,A5
(D, M, S) 060
3822
4310
1150
800
940
1024
1058
48A4,A5
(E, N, T) 060
3936
4146
1099
907
964
968
1096
48A2,A3
'
A
OF GRAVITY
(ram)
B
i
)
*Operating weight includes largest indoor fan motor, microchannel heat exchanger, modulating
power exhaust (variable air volume units), and variable frequency drive (variable air volume
units).
Co
CV
MQfOR WEZGHTS
LBS
(KQ)
,_Eou
EFF(]'?
25
(/8
6_
30
(22
55
40
(29
84
HP
K_,;'
HP
Kw)
HP
Kw)
230i460
575
.
i_F
RETURN
AIR
RETURN
SUPPLY
AIR
CONDENSATE
AIR @_
SUPPLY AIR@
DRAIN
CONDENSATE
Fig. 12 -- Air Distribution -- Thru-the-Bottom
DRAIN
Fig. 13 -- Air Distribution -- Thru-the-Side
Step 5 _ Install Flue Hood
Step 7 -- Install Gas Piping -- Unit is equipped for
48A2,A3,A4,A5020-050
UNITS -- Flue hood is shipped inside gas section of unit. To install, secure flue hood to access
panel. See Fig. 14.
use with natural gas. Installation must conform with local
building codes or, m the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1.
48A2,A3,A4,A5060
UNITSFlue hood and wind baffle
are shipped inside gas section of unit. To install, secure flue
hood to access panel. Install the two pieces of the wind baffle
Install manual gas shutoff valve with a Ys-in. _
pressure
tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 18. An vs-m. NPT is
also located on the gas manifold adjacent to the gas valve.
over the flue hood. See Fig. 15.
NOTE: When properly installed, flue hood will line up with
combustion
fan housing. See Fig. 16.
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Personal injury
or damage to unit may occur.
Step 6 -- Trap Condensate
Drain -- See Fig. 4-9
for drain location. Condensate drain is open to atmosphere and
must be trapped. Install a trapped dram at the drain location.
One 1-in. female coupling is provided inside the unit evaporator section for condensate drain connection. A trap at least 4-in.
deep must be used. See Fig. 17. Trap must be installed to prevent freeze-up.
IMPORTANT:
must
not be lessNatural
than 5 m.
gaswgpressure
or greater
at unit
than gas
13.5connection
in. wg.
Condensate pans are sloped so that water will completely
dram from the condensate pan to comply with indoor air quality guidelines. The condensate dram pans are not insulated.
Size gas-supply piping for 0.5-in. wg lnaxhnum pressure
drop. Do not use supply pipe smaller than unit gas connection.
17
I
]
GAS SECTION
ACCESS PANEL
COMBUSTION
FAN HOUSING
FLUE HOOD
SHIPPING
LOCATION
Fig. 16- Combustion Fan Housing Location
(48A2,A3,A4,A5020-050 Shown)
FLUE
HOOD
Fig. 14 n Flue Hood Location
(48A2,A3,A4,A5020-050
Units)
o
GAS SECTION
ACCESS PANEL
FLUE HOOD
o'o
J
Fig. 17 -- Condensate Drain Trap Piping Details
(Typical Roof Curb or Slab Mount Shown)
,/
/
MANUALSHUTOFF_
I!
I
BAFFLE
I
X
'',(
GAS
II
|
TOP VIEW
PRESSURE TAP
(1/8" NPT PLUG)
SIDE VIEW
Fig. 15- Flue Hood Location
(48A2,A3,A4,A5060 Units)
'---
"_----
SEDIMENT
TRAP
Fig. 18 -- Field Gas Piping
OPTIONAL STAGED GAS UNITS -- See Table 7 for staged
gas information.
Staging pattern is selected during controls
start-up.
For complete information
and service instructions
for
staged gas control units, see Control Operation and Troubleshooting literature.
Step 8 -- Make Electrical
Provide a unit safety disconnect switch in the main power
supply to each unit (see Fig. 19). Select switch size and mounting location in accordance
with applicable local codes or
National Electrical Code (NEC). If combining the functions of
safety disconnect
with lnaxilnum
overcurrent
protection
(MOCP) fuses ("fused disconnect"), coordinate safety switch
size with MOCP size data as marked on unit informative plate.
Connections
POWER WIRING -- Units are factory wired for the voltage
shown on the unit nameplate.
18
Table 7 -- 48A Series Staged Gas Control
MODEL
NUMBER OF
STAGES
NUMBER
I
I
i
POSITION
HEAT SIZE
5
6,7,8
020
025
027
030
035
040
050
S
5 stages
,?,l
ciz
wcc
_m
I
i
Low
FIELD
=_
POWER
=_]
SUPPLY
__
O) w
C3Z
-JZ
Luo
Eo
035
040
050
T
TB1
rqN
C3
High
EQUIP GND
020
7 stages
T
025
027
030
High
9 stages
T
060
High
11 stages
S
060
Low
FIELD-INSTALLED
Unit may be equipped with optional factory-installed nonfused disconnect switch (see Fig. 19). Provide maximum
overcurrent protection devices (fuses or HACR breakers, per
local codes) in branch circuit wiring remote from unit. Observe
requirements of NEC Article 440. Install service switch
upstream of remote fuses if required.
The main power terminal block is suitable for use with
aluminum or copper wire. See Fig. 19. Units have circuit
breakers for compressors, fan motors, and control circuit. The
unit must be electrically grounded in accordance with local
codes, or in absence of local codes, with NEC, ANSI Cl-latest
year.
FIELD POWER SUPPLY -- Unit is factory wired for voltage shown on unit nameplate. See Tables 8A and 8B for electrical data.
z
D-
C3
d
LU
MOCP
NEC
RLA
MOHXRTPF
---------
Full Load Amps
Heating, Air Conditioning
Locked Rotor Amps
Minimum Circuit Amps
GND
FACTORY-INSTALLED
Ground
National Electrical Code
Terminal Block
Fig. 19-
Field Power Wiring Connections
unit, a Y/s-in. diameter hole is provided
post next to the control box.
in the condenser
side
Do not route control wiring in the same conduit as power
wiring.
If disconnect box is mounted to corner post, be careful not
to drill or screw into the condenser coil.
NOTES FOR TABLES 8A AND 8B
Example: Supply voltage is 460-3-60.
A 8 c
AB = 452 v
BC = 464 v
452
¢_._R%.
Average
AC = 455 v
Voltage
=
+ 464
+ 455
3
1371
O
_//_l,_
o
3
S
= 457
&/ST_O
*Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. The Canadian units may
be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent of voltage imbalance.
% Voltage imbalance
= 100x
DISCONNECT
LEGEND
GNDNEC -TB
--
and Refrigeration
Maximum Overcurrent Protection
National Electrical Code
Rated Load Amps
Uicrochannel
Heat Exchanger
Round Tube Plate Fin Coil
.FTN
,7"
LEGEND
FLA
HAOR
LRA
MCA
OPTIONAL
FACTORY-INSTALLED
DISCONNECT
I
I
I
I
I
O
Field wiring can be brought into the unit from bottom
(through basepan and roof curb) or through side of unit (corner
post next to control box).
A 31/2-in.NPT coupling for field power wiring and a 3/4-in.
NPT coupling for 24-v control wiring are provided in basepan.
In the side post, there are two 21/2-in. (sizes 020-035) or 3-in.
(sizes 040-060) knockouts for the field power wiring. See
Fig. 4-9. If control wiring is to be brought in through the side of
LEGEND AND
DISCONNECT
Determine
(AB) 457
(BC) 464
(AC) 457
Maximum
Determine
maximum deviation from average voltage.
- 452 = 5 v
- 457 = 7 v
- 455 = 2 v
deviation is 7 v.
percent of voltage imbalance.
7
= 100 x 457
= 1.53%
% Voltage Imbalance
This amount of phase imbalance is satisfactory
allowable 2%.
max voltage deviation from average voltage
average voltage
I
19
as it is below the maximum
contact
your local
electric
company
IMPORTANT:
If the
supply utility
voltage
phase immediately.
imbalance is more than 2%,
I
I
Table 8A -- 48A2,A3,A4,A5020-060
UNIT
SIZE VOLTAGE
48A 3 PH, 60 Hz
208
230
020
380
46O
575
208
230
VOLTAGE
RANGE
Min
187
207
342
414
518
187
207
Max
229
253
418
508
Cir A, No. 1
RLA
22.4
22.4
11.0
10.6
632
229
253
7.7
29.5
29.5
LRA
149
149
88
75
54
195
195
Units Without Convenience Outlet
COMPRESSOR
Cir A, No. 2 Cir B, No. 1
Cir B, No. 2
RLA
RLA
22.4
22.4
11.0
10.6
7.7
29.5
29.5
LRA
149
149
88
75
54
195
195
RLA
29.5
29.5
16.7
14.7
12.2
29.5
29.5
LRA
195
195
123
95
80
195
195
--
--
--
--
--
--
--
LRA
--
--
--
--
--
--
--
CONDENSER
FAN MOTOR
Qty
FLA
2
6.5
(ea)
2
2
2
2
2
2
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
EVAPORATOR
FAN MOTOR
Hp
FLA
5
16.7
10
46O
575
See Legend
342
414
518
418
508
632
16.7
14.7
12.2
123
95
80
16.7
14.7
12.2
123
95
80
16.7
14.7
12.2
123
95
80
--
--
--
and Notes on page 19.
20
--
--
--
2
2
2
3.6
(ea)
3.3
(ea)
2.6
(ea)
FLA (total)
-23.6
-23.6
MCA
111.4
135.0
125.8
149.4
MOCP*
125
150
150
175
SUPPLY
46.2
-23.6
145.1
168.7
175
200
5
15.2
-23.6
110.1
133.7
125
150
10
28.0
15
42.0
-23.6
-23.6
122.9
146.5
140.0
163.6
150
175
175
200
5
9.1
-14.8
59.2
74.0
70
90
10
16.7
-14.8
66.8
81.6
80
90
15
24.5
-14.8
76.5
91.3
100
110
5
7.6
-12.6
53.8
66.4
60
80
-12.6
-12.6
-9.6
60.2
72.8
68.8
81.4
42.0
51.6
70
80
80
100
50
60
10
14.0
15
21.0
5
6.1
10
11.0
-9.6
46.9
56.5
50
60
15
17.0
-9.6
54.1
63.7
70
80
5
16.7
-23.6
125.6
149.2
150
175
10
30.8
-23.6
140.0
163.6
150
175
15
46.2
5
15.2
-23.6
-23.6
159.3
182.9
124.3
147.9
200
225
150
175
-23.6
137.1
160.7
150
175
-23.6
-14.8
154.2
177.8
70.6
85.4
175
200
80
100
10
5
380
POWER
15
15
025
30.8
POWER
EXHAUST
28.0
42.0
9.1
10
16.7
-14.8
78.2
93.0
90
100
15
24.5
-14.8
87.9
102.7
110
125
5
7.6
-12.6
62.0
74.6
70
80
10
14.0
-12.6
68.4
81.0
80
90
15
21.0
-12.6
77.0
89.6
90
110
5
6.1
-9.6
51.0
60.6
60
70
10
11.0
-9.6
55.9
65.5
60
70
15
17.0
-9.6
63.1
72.7
80
80
Table 8A -- 48A2,A3,A4,A5020-060
UNIT
SIZE VOLTAGE
48A 3 PH, 60 Hz
208
230
027
380
46O
575
208
230
030
380
46O
575
See Legend
VOLTAGE
RANGE
Min
187
207
342
414
518
187
207
342
414
518
Max
229
253
418
508
632
229
253
418
508
Units Without Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1
RLA
29.5
29.5
16.7
14.7
12.2
23.2
23.2
12.2
11.2
632
7.9
LRA
195
195
123
95
80
184
164
73
75
54
CONDENSER
EVAPORATOR
POWER
POWER
SUPPLY
Cir A, No. 2
Cir B, No. 1
Cir B, No. 2
FAN MOTOR
FAN MOTOR
EXHAUST
RLA
RLA
RLA
Qty
Hp
FLA
10
30.8
FLA (total)
-23.6
MCA
140.0
163.6
MOCP*
150
175
15
46.2
-23.6
159.3
182.9
200
225
20
59.4
-23.6
175.8
199.4
225
250
10
28.0
-23.6
137.1
160.7
150
175
15
42.0
-23.6
154.2
177.8
175
200
20
54.0
10
16.7
-23.6
-14.8
169.2
192.8
78.2
93.0
200
225
90
100
15
24.5
-14.8
87.9
102.7
110
125
20
30.0
-14.8
94.8
109.6
110
125
10
14.0
-12.6
68.4
81.0
80
90
21.0
-12.6
77.0
89.6
90
110
20
27.0
-12.6
84.5
97.1
110
110
10
11.0
-9.6
55.9
65.5
60
70
15
17.0
-9.6
63.1
72.7
80
80
20
22.0
-9.6
69.3
78.9
90
110
10
30.8
15
46.2
-23.6
-23.6
144.3
167.9
163.6
187.2
175
175
200
225
20
59.4
-23.6
180.1
203.7
225
250
10
28.0
-23.6
141.0
164.6
150
175
42.0
-23.6
158.5
182.1
200
200
20
54.0
-23.6
173.5
197.1
225
250
10
16.7
-14.8
76.9
91.7
90
100
15
24.5
-14.8
86.6
101.4
110
125
20
30.0
-14.8
93.5
108.3
110
125
10
14.0
-12.6
68.9
81.5
80
90
15
21.0
20
27.0
-12.6
-12.6
77.7
90.3
85.2
97.8
90
110
110
110
10
11.0
-9.6
50.6
60.2
60
70
15
17.0
-9.6
58.1
67.7
70
80
20
22.0
-9.6
64.3
73.9
80
90
29.5
29.5
16.7
14.7
12.2
23.2
23.2
12.2
11.2
7.9
LRA
195
195
123
95
80
164
164
73
75
54
29.5
29.5
16.7
14.7
12.2
23.2
23.2
12.2
11.2
7.9
LRA
195
195
123
95
80
164
164
73
75
54
LRA
6.5
(ea)
--
6.6
(ea)
--
3.6
(ea)
--
--
--
23.2
23.2
12.2
11.2
7.9
and Notes on page 19.
21
FLA
--
--
164
164
73
75
54
2
2
2
2
2
2
2
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
15
15
Table 8A -- 48A2,A3,A4,A5020-060
UNIT
SIZE VOLTAGE
48A 3 PH, 60 Hz
208
230
035
380
46O
575
208
230
040
380
46O
575
See Legend
VOLTAGE
RANGE
Min
187
207
342
414
518
187
207
342
414
518
Max
229
253
418
508
COMPRESSOR
Cir A, No. 1
RLA
22.4
22.4
11.0
10.6
632
229
253
418
508
632
Units Without Convenience Outlet (cont)
7.7
30.1
30.1
19.2
16.7
12.2
LRA
149
149
88
75
54
225
225
140
114
80
CONDENSER
EVAPORATOR
POWER
POWER
SUPPLY
Cir A, No. 2
Cir B, No. 1
Cir B, No. 2
FAN MOTOR
FAN MOTOR
EXHAUST
RLA
RLA
RLA
Qty
Hp
FLA
15
46.2
FLA (total)
-23.6
MCA
175.8
199.4
MOCP*
200
225
20
59.4
-23.6
192.3
215.9
250
250
25
74.8
-23.6
211.5
235.1
250
300
15
42.0
-23.6
170.7
194.3
200
225
20
54.0
-23.6
185.7
209.3
225
250
25
68.0
15
24.5
-23.6
-14.8
203.2
226.8
98.2
113.0
250
250
110
125
20
30.0
-14.8
105.1
119.9
125
125
25
38.0
-14.8
115.1
129.9
150
150
15
21.0
-12.6
87.5
100.1
100
110
27.0
-12.6
95.0
107.6
110
125
25
34.0
-12.6
103.7
116.3
125
150
15
17.0
-9.6
66.3
75.9
80
90
20
22.0
-9.6
72.5
82.1
90
100
25
27.0
-9.6
78.8
88.4
100
110
15
46.2
20
59.4
-23.6
-23.6
204.2
227.8
220.7
244.3
250
250
250
300
25
74.8
-23.6
239.9
263.5
300
300
15
42.0
-23.6
199.3
222.9
225
250
54.0
-23.6
214.3
237.9
250
250
25
68.0
-23.6
231.8
255.4
250
300
15
24.5
-14.8
121.8
136.6
125
150
20
30.0
-14.8
128.7
143.5
150
150
25
38.0
-14.8
138.7
153.5
175
175
15
21.0
-12.6
106.3
118.9
125
125
20
27.0
25
34.0
-12.6
-12.6
113.8
126.4
122.5
135.1
125
150
150
150
15
17.0
-9.6
80.5
90.1
90
100
20
22.0
-9.6
86.7
96.3
100
110
25
27.0
-9.6
93.0
102.6
110
125
22.4
22.4
11.0
10.6
7.7
30.1
30.1
19.2
16.7
12.2
LRA
149
149
88
75
54
225
225
140
114
80
30.1
30.1
19.2
16.7
12.2
30.1
30.1
19.2
16.7
12.2
LRA
225
225
140
114
80
225
225
140
114
80
30.1
30.1
19.2
16.7
12.2
30.1
30.1
19.2
16.7
12.2
and Notes on page 19.
22
LRA
225
225
140
114
80
225
225
140
114
80
2
2
2
2
2
4
4
2
4
4
FLA
6.5
(ea)
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
20
20
Table 8A -- 48A2,A3,A4,A5020-060
UNIT
SIZE
48A
VOLTAGE
3 PH, 60 Hz
VOLTAGE
RANGE
Min
Max
Cir A, No. 1
RLA
LRA
Units Without Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 2
Cir B, No. 1
RLA
LRA
RLA
LRA
Cir B, No. 2
RLA
LRA
CONDENSER
FAN MOTOR
EVAPORATOR
FAN MOTOR
POWER
EXHAUST
Qty
Hp
FLA (total)
MCA
MOCP*
23.6
233.5
257.1
250
300
-23.6
252.7
276.3
300
350
23.6
269.2
292.8
350
350
23.6
227.1
250.7
250
300
-23.6
244.6
268.2
300
300
23.6
259.6
283.2
300
350
14.6
146.7
161.5
175
175
-14.6
157.7
171.5
175
200
14.6
163.6
178.4
200
200
12.6
116,6
131.2
125
180
127.3
139.9
134.6
147.4
180
180
150
178
9.6
89.1
98.7
110
110
-9.6
95.4
105.0
110
125
9.6
101,6
111.2
125
125
35.4
320.7
356.1
350
400
-35.4
337.2
372.6
400
450
35.4
369.7
405.1
450
500
35.4
313.4
348.8
350
400
-35.4
328.4
363.8
400
400
35.4
358.4
393.8
450
450
22.2
169.9
192.1
200
228
-22.2
176.6
199.0
200
228
22.2
192.7
214.9
228
280
16.9
143.7
162.6
178
178
18.9
181.2
170.1
166.2
185.1
178
200
200
225
14.4
122.6
137.0
125
150
-14.4
128.8
143.2
150
175
14.4
140.1
154.5
175
175
35.4
337.7
373.1
400
400
-35.4
354.2
389.6
400
450
35.4
386.7
422.1
500
500
35.4
329.8
365.2
350
400
-35.4
344.8
380.2
400
450
35.4
374.8
410.2
450
500
22.2
151.9
170.6
175
200
159.4
178.3
175
200
FLA
20
208
23O
050
38O
46O
575
208
23O
060
(MCHX)
38O
46O
575
208
23O
060
(RTPF)
38O
46O
575
See Legend
187
207
342
414
518
187
207
342
414
518
187
207
342
414
518
229
253
418
508
632
229
253
418
508
632
229
253
418
508
632
33.3
33.3
23.7
17.9
12.8
51.3
51.3
26.9
22.4
19.9
51.3
51.3
26.9
22.4
19.9
239
239
145
125
80
300
300
139
150
109
300
300
139
150
109
33.3
33.3
23.7
17.9
12.8
51.3
51.3
26.9
22.4
19.9
51.3
51.3
26.9
22.4
19.9
239
239
145
125
80
300
300
139
150
109
300
300
139
150
109
33.3
33.3
23.7
17.9
12.8
51.3
51.3
26.9
22.4
19.9
51.3
51.3
26.9
22.4
19.9
239
239
145
125
80
300
300
139
150
109
300
300
139
150
109
33.3
33.3
23.7
17.9
12.8
51.3
51.3
26.9
22.4
19.9
51.3
51.3
26.9
22.4
19.9
and Notes on page 19.
23
239
239
145
125
80
300
300
139
150
109
300
300
139
150
109
4
4
4
4
4
4
4
4
4
4
6
6
6
6
6
6.5
(ea)
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
5.5
(ea)
5.8
(ea)
3.7
(ea)
2.9
(ea)
2.3
(ea)
6.5
(ea)
6.6
(ea)
3.6
(ea)
3.3
(ea)
2.6
(ea)
FLA
59.4
25
74.8
30
88.0
20
54.0
25
68.0
30
80.0
20
30.0
25
38.0
3O
43.5
2O
27.O
25
34.O
3O
4O.O
2O
22.0
25
27.O
30
32.0
25
74.8
30
88.0
40
114.0
25
68.0
30
80.0
40
104.0
25
38.0
30
43.8
4O
56.2
25
34.O
3O
4O.O
4O
52.0
25
27.0
30
32.0
40
41.0
25
74.8
30
88.0
40
114.0
25
68.0
30
80.0
40
104.0
25
38.0
-12.6
12.6
-16.9
POWER
SUPPLY
3O
43.5
-22.2
4O
56.2
22.2
174.4
193.3
228
228
16.9
151.9
170.6
175
200
-16.9
159.4
178.3
175
200
18.9
174.4
193.3
228
225
150
150
25
34.O
30
40.0
4O
52.0
25
27.0
14.4
129.0
143.4
30
32.0
-14.4
135.2
149.6
150
175
40
41.0
14.4
146.5
160.9
175
200
Table 8B -- 48A2,A3,A4,A5020-060
UNIT
VOLTAGE
SIZE
48A 3 PH, 60 Hz
208
230
VOLTAGE
RANGE
Min
187
207
Max
229
253
Units With Convenience Outlet
COMPRESSOR
CONDENSER
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2 FAN MOTOR
RLA
22.4
22.4
LRA
149
149
RLA
22.4
22.4
LRA
149
149
RLA
29.5
29.5
LRA
RLA
LRA
195
Qty
2
195
2
FLA
6.5
(ea)
6.6
(ea)
EVAPORATOR
FAN MOTOR
575
2O8
230
414
518
187
207
508
632
229
253
10.6
7.7
29.5
29.5
75
54
195
195
10.6
7.7
29.5
29.5
75
54
195
195
14.7
12.2
29.5
29.5
95
2
80
2
195
2
195
2
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
575
2O8
23O
414
518
187
207
508
632
229
253
14.7
12.2
29.5
29.5
95
80
195
195
14.7
12.2
29.5
29.5
95
80
195
195
14.7
12.2
29.5
29.5
95
2
80
2
195
2
195
2
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
30.8
MCA
118.4
142.0
132.8
156.4
15
46.2
-23.6
7.0
7.0
152.1
175.7
175
200
5
15.2
-23.6
7.0
7.0
117.1
140.7
125
150
10
28.0
15
42.0
-23.6
-23.6
7.0
7.0
7.0
7.0
129.9
153.5
147.0
170.6
150
175
175
200
5
7.6
-12.6
3.5
3.5
57.3
69.9
70
80
10
14.0
-12.6
3.5
3.5
63.7
76.3
70
90
15
21.0
-12.6
3.5
3.5
72.3
84.9
90
100
5
6.1
-9.6
2.5
2.5
44.5
54.1
50
60
10
11.0
15
17.0
5
16.7
-9.6
-9.6
-23.6
2.5
2.5
2.5
2.5
7.0
7.0
49.4
59.0
56.6
66.2
132.6
156.2
60
70
70
80
150
175
10
30.8
-23.6
7.0
7.0
147.0
170.6
175
200
15
46.2
-23.6
7.0
7.0
166.3
189.9
200
225
5
15.2
10
28.0
15
42.0
-23.6
-23.6
-23.6
7.0
7.0
7.0
7.0
7.0
7.0
131.3
154.9
144.1
167.7
161.2
184.8
150
175
150
175
200
225
5
7.6
-12.6
3.5
3.5
65.5
78.1
80
90
10
14.0
-12.6
3.5
3.5
71.9
84.5
80
90
15
21.0
5
6.1
-12.6
-9.6
3.5
3.5
2.5
2.5
80.5
93.1
53.5
63.1
100
110
60
70
10
11.0
-9.6
2.5
2.5
58.4
68.0
70
80
15
17.0
-9.6
2.5
2.5
65.6
75.2
80
90
10
30.8
15
46.2
-23.6
-23.6
7.0
7.0
7.0
7.0
147.0
170.6
166.3
189.9
175
200
200
225
20
59.4
-23.6
7.0
7.0
182.8
206.4
225
250
10
28.0
-23.6
7.0
7.0
144.1
167.7
150
175
15
42.0
20
54.0
-23.6
-23.6
7.0
7.0
7.0
7.0
161.2
184.8
176.2
199.8
200
225
225
250
10
14.0
-12.6
3.5
3.5
71.9
84.5
80
90
15
21.0
-12.6
3.5
3.5
80.5
93.1
100
110
20
27.0
10
11.0
-12.6
-9.6
3.5
3.5
2.5
2.5
88.0
100.6
58.4
68.0
110
125
70
80
15
17.0
20
22.0
-9.6
-9.6
2.5
2.5
2.5
2.5
65.6
75.2
71.8
81.4
80
90
90
100
5
16.7
10
O27
46O
575
414
518
508
632
14.7
12.2
95
80
14.7
12.2
95
80
14.7
12.2
95
2
80
2
See Legend and Notes on page 19.
24
3.3
(ea)
2.6
(ea)
POWER SUPPLY
FLA
7.0
7.0
7.0
7.0
FLA
025
460
CONVENIENCE
OUTLET
FLA
(total)
-23.6
-23.6
Hp
020
460
POWER
EXHAUST
MOCP*
125
150
150
175
Table 8B -- 48A2,A3,A4,A5020-060
UNIT VOLTAGE
SIZE
48A 3 PH, 60 Hz
208
230
Units With Convenience Outlet (cont)
VOLTAGE
RANGE
COMPRESSOR
CONDENSER
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2 FAN MOTOR
Min
RLA
187
207
Max
229
253
23.2
23.2
LRA
184
164
RLA
23.2
23.2
LRA
164
164
RLA
23.2
23.2
LRA
164
164
RLA
23.2
23.2
LRA
164
164
Qty
2
2
FLA
6.5
(ea)
6.6
(ea)
EVAPORATOR
FAN MOTOR
Hp
FLA
575
2O8
230
414
518
187
207
508
632
229
253
11.2
7.9
22.4
22.4
75
54
149
149
11.2
7.9
22.4
22.4
75
54
149
149
11.2
7.9
30.1
30.1
75
54
225
225
11.2
7.9
30.1
30.1
75
54
225
225
2
2
2
2
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
575
2O8
230
414
518
187
207
508
632
229
253
10.6
7.7
30.1
30.1
75
54
225
225
10.6
7.7
30.1
30.1
75
54
225
225
16.7
12.2
30.1
30.1
114
80
225
225
16.7
12.2
30.1
30.1
114
80
225
225
2
2
2
2
3.3
(ea)
2.6
(ea)
6.5
(ea)
6.6
(ea)
46O
575
414
518
508
632
16.7
12.2
114
80
16.7
12.2
114
80
16.7
12.2
114
80
16.7
12.2
114
80
See Legend and Notes on page 19.
25
2
2
2.6
(ea)
FLA
(total)
-23.6
FLA
MCA
7.0
7.0
151.3
174.9
MOCP*
175
200
-23.6
-23.6
7.0
7.0
7.0
7.0
170.6
194.2
187.1
210.7
200
225
225
250
-23.6
7.0
7.0
148.0
171.6
175
175
-23.6
-23.6
7.0
7.0
7.0
7.0
165.5
189.1
180.5
204.1
200
225
225
250
-12.6
3.5
3.5
72.4
85.0
80
90
3.5
3.5
3.5
3.5
81.2
93.8
88.7
101.3
100
110
110
125
15
46.2
20
59.4
10
28.0
15
42.0
20
54.0
10
14.0
15
21.0
20
27.0
-12.6
-12.6
10
11.0
-9.6
2.5
2.5
53.1
62.7
60
70
15
17.0
-9.6
2.5
2.5
60.6
70.2
70
80
20
22.0
-9.6
2.5
2.5
66.8
76.4
80
90
15
46.2
-23.6
7.0
7.0
182.8
206.4
225
250
20
59.4
25
74.8
-23.6
-23.6
7.0
7.0
7.0
7.0
199.3
222.9
218.5
242.1
250
250
250
300
15
42.0
-23.6
7.0
7.0
177.7
201.3
200
225
20
54.0
25
68.0
-23.6
-23.6
7.0
7.0
7.0
7.0
192.7
216.3
210.2
233.8
225
250
250
300
15
21.0
-12.6
3.5
3.5
91.0
103.6
110
110
20
27.0
25
34.0
15
17.0
-12.6
-12.6
-9.6
3.5
3.5
3.5
3.5
2.5
2.5
98.5
111.1
107.2
119.8
68.8
78.4
125
125
125
150
80
90
20
22.0
-9.6
2.5
2.5
75.0
84.6
90
100
25
27.0
-9.6
2.5
2.5
81.3
90.9
100
110
15
46.2
20
59.4
25
74.8
-23.6
-23.6
-23.6
7.0
7.0
7.0
7.0
7.0
7.0
211.2
234.8
227.7
251.3
246.9
270.5
250
250
250
300
300
300
15
42.0
-23.6
7.0
7.0
206.3
229.9
225
250
20
54.0
25
68.0
15
21.0
-23.6
-23.6
-12.6
7.0
7.0
7.0
7.0
3.5
3.5
221.3
244.9
238.8
262.4
109.8
122.4
250
250
300
300
125
125
20
27.0
25
34.0
15
17.0
20
22.0
-12.6
-12.6
-9.6
-9.6
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
117.3
129.9
126.0
138.6
83.0
92.6
89.2
98.8
125
150
150
150
90
100
110
110
25
27.0
-9.6
2.5
2.5
95.5
105.1
110
125
040
3.3
(ea)
POWER SUPPLY
30.8
035
460
CONVENIENCE
OUTLET
10
030
460
POWER
EXHAUST
Table 8B -- 48A2,A3,A4,A5020-060
UNIT
SIZE
48A
VOLTAGE
3PH, 60Hz
Units With Convenience Outlet (cont)
VOLTAG
E
RANGE
COMPRESSOR
CONDENSER
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2 FAN MOTOR
Min Max
RLA
LRA
RLA
LRA
RLA
LRA
RLA
LRA
Qty
FLA
EVAPORATOR
FAN MOTOR
Hp
FLA
POWER
EXHAUST
FLA
(total)
230
187
207
229
253
33.3
33.3
239
239
33.3
33.3
239
239
33.3
33.3
239
239
33.3
33.3
239
239
4
4
6.5
(ea)
6.6
(ea)
575
414
518
508
632
17.9
12.8
125
80
17.9
12.8
125
80
17.9
12.8
125
80
17.9
12.8
125
80
4
4
3.3
(ea)
2.6
(ea)
230
187
207
229
253
51.3
51.3
300
300
51.3
51.3
300
300
51.3
51.3
300
300
51.3
51.3
300
300
4
4
5.5
(ea)
5.8
(ea)
060
(MCHX)
460
414
508
22.4
150
22.4
150
22.4
150
22.4
150
4
2.9
(ea)
208
230
518
187
207
632
229
253
19.9
51.3
51.3
109
300
300
19.9
51.3
51.3
109
300
300
19.9
51.3
51.3
109
300
300
19.9
51.3
51.3
109
300
300
4
6
6
2.3
(ea)
6.5
(ea)
6.6
(ea)
060
(RTPF)
460
575
See Legend
414
518
508
632
22.4
19.9
150
109
22.4
19.9
150
109
22.4
19.9
150
109
22.4
19.9
150
109
and Notes on page 19.
26
6
6
3.3
(ea)
2.6
(ea)
250
300
23.6
25
75.0
23.6
7.0
7.0
259.7
283.3
300
350
30
88.0
23.6
7.0
7.0
276.2
299.8
350
350
20
54.0
23.6
25
68.0
23.6
7.0
7.0
7.0
7.0
234.1
257.7
251.6
275.2
250
300
300
300
30
80.0
23.6
7.0
7.0
266.6
290.2
300
350
20
27.0
12.6
3.5
3.5
122.1
134.7
125
150
25
34.0
12.6
30
40.0
12.6
3.5
3.5
3.5
3.5
130.8
143.4
138.3
150.9
150
175
175
175
20
22.0
9.6
2.5
2.5
91.6
101.2
110
110
25
27.0
9.6
2.5
2.5
97.9
107.5
110
125
30
32.0
9.6
25
75.0
35.4
2.5
2.5
7.0
7.0
104.1
113.7
327.7
363.1
125
125
400
400
30
88.0
35.4
7.0
7.0
344.2
379.6
400
450
40
114.0
35.4
7.0
7.0
376.7
412.1
450
500
25
68.0
35.4
30
80.0
35.4
7.0
7.0
7.0
7.0
320.4
355.8
335.4
370.8
350
400
400
450
40
104.0
35.4
7.0
7.0
365.4
400.8
450
500
25
34.0
18.9
3.5
3.5
147.2
166.1
175
200
30
40.0
18.9
40
52.0
18.9
3.5
3.5
3.5
3.5
154.7
173.6
169.7
188.6
175
200
200
225
25
27.0
14.4
2.5
2.5
125.1
139.5
150
150
30
32.0
14.4
2.5
2.5
131.3
145.7
150
175
40
41.0
25
74.8
142.6
157.0
344.7
380.1
361.2
396.6
175
175
400
450
400
450
m
m
m
m
575
MOCP*
59.0
m
208
MCA
240.5
264.1
20
050
460
POWER SUPPLY
FLA
7.0
7.0
m
208
CONVENIENCE
OUTLET
30
88.0
35.4
2.5
2.5
7.0
7.0
7.0
7.0
40
114.0
35.4
7.0
7.0
393.7
429.1
500
500
25
68.0
7.0
7.0
7.0
7.0
7.0
7.0
336.8
372.2
351.8
387.2
381.8
417.2
400
400
400
450
450
500
3.5
3.5
155.4
174.3
175
200
162.9
181.8
177.9
196.8
131.5
145.9
200
200
225
225
150
150
14.4
35.4
m
35.4
30
80.0
35.4
40
104.0
35.4
25
34.0
18.9
30
40.0
18.9
40
52.0
25
27.0
14.4
3.5
3.5
3.5
3.5
2.5
2.5
30
32.0
14.4
2.5
2.5
137.7
152.1
150
175
40
41.0
14.4
2.5
2.5
149.0
163.4
175
200
m
18.9
Routing Through Bottom of Unit -- If wiring is brought in
through bottom of unit, use field-supplied watertight conduit to
route power wiring through the 31/2-in. diameter hole provided
in the unit basepan.
On 208/230-v units, transformers 1-5 are wired for 230-v. If
208/230-v unit is to be mn with 208-v power supply, the transformers must be rewired as follows:
For transformer 1 move the black wires connected
nal H2 and connect it to terminal H3.
Install conduit connector
in unit basepan as shown in
Fig. 4-9. Route power and ground lines through connector to
terminal connections in unit control box as shown on unit
wiring diagram and Fig. 19.
For transformers 2-4, that are used for the 24-volt control
circuits, connect as follows:
1. Remove cap from red (208 v) wire.
Use strata relief going into control box through 35/s-in.
diameter hole provided. After wires are in unit control box,
connect to power terminal block (see Power Wiring section on
page 18).
Low-voltage wiring must be mn in watertight conduit from
the basepan to control box and through 7/s-in. diameter hole
provided in bottom of unit control box. Field-supplied
strata
relief must be used going into the box. After wiring is in
control box, make connections to proper terminals on terminal
blocks (see Field Control Wiring section on this page).
Cap orange wire.
4.
Splice red wire and black unit power wire. Cap wires.
The control options that the unit can provide
following parameters:
•
•
box.
•
After wiring is in control box, make connection to proper
terminals on terminal blocks (see Field Control Wiring section
below).
•
•
•
•
•
•
IMPORTANT:
The VAV (variable air volume) units use
variable frequency drives, which generate and can radiate
radio frequency energy. If units are not installed and used
in accordance with these instructions, they may cause radio
interference. They have been tested and found to comply
with lhnits of a Class A computing device as defined by
FCC (Federal Colmnunications
Colmnission) regulations,
Subpart J of Part 15, which are designed to provide reasonable protection against such interference when operated in
a colmnercial enviromnent.
outlet
]
relate to the
CV (constant
volume),
VAV (variable
air volume),
VVT :R:(variable volume variable temperature)
or Carrier
TEMP system control operation.
Standalone with a thermostat (CV) or with a space sensor
(CV and VAV)
Network
application
with
CCN
(Carrier
Comfort
Network R) or other networks
Demand ventilation with CO2 sensor
Economizer
and economizer with changeover
control
Staged gas heat
Building and duct static pressure control
Fire shutdown and smoke control
Diagnostics
and monitoring
For constant volume applications a thermostat
space temperature sensor (SPT) will be required.
(T-Stat) or
T-STAT (Conventional
Thermostat)
-- Unit can be controlled with a Carrier-approved
accessory electro-mechanical
or electronic thermostat that has two stages of cooling, two
stages of heating control and an output for indoor fan control. It
may also include thne of day scheduling or use the scheduling
routines built into the (_mfortLink TM controls.
Install thermostat according to the installation instructions
included with accessory thermostat and the unit wiring diagrams. Locate thermostat assembly on a solid interior wall in
the conditioned space to sense average temperature.
with
Fire
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through conduit into unit to lowvoltage connection in the mare control box. For thermostat
TB4 connections see Fig. 20.
in the installers
Voltage to compressor terlninals during compressor operation
must be within the voltage range indicated on the unit nameplate. Phases must be balanced within 2%.
Use the formula in Tables 8A and 8B to determine
centage of voltage hnbalance.
3.
FIELD CONTROL WIRINGThe 48A Series units support a large number of control options that can impact the field
control wiring.
Bring low-voltage control wiring through the 7/s-in. diameter hole provided in the condenser section side post. Use strain
relief going into 7/s-in. diameter hole in bottom of unit control
(located
Remove cap from spliced orange (230 v) wire. Disconnect orange wire from black unit power wire.
CAPPED.
FailureBEto CERTA1N
do so may damage
the transformers.
IMPORTANT:
UNUSED
WIRES ARE
Use field-supplied
strain relief going into control box
through 35/s-in. diameter hole provided. After wires are in unit
control box, connect to power terminal block (see Power Wiring section on page 18).
Affix crankcase heater sticker
packet) to unit disconnect switch.
2.
If the unit is equipped with the optional convenience
connect the yellow wire to H2 on transformer 5.
Routing Through Side of Unit -- Route power wiring in
field-supplied watertight conduit into unit through 21/2-m. (sizes 020-035) or 3-m. (sizes 040-060) hole.
The unit must be electrically grounded in accordance
local codes and NEC ANSI/NFPA
70 (National
Protection Association). Personal injury may result.
to termi-
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minhnum). For over
75 ft, use no. 14 AWG insulated wire (35 C Minimum). All
wire larger than no. 18 AWG cannot be directly connected at
the thermostat and will require a junction box and splice at the
thermostat. Set heat anticipator settings as follows:
the per-
more than 2%, contact your local electric utility company
IMPORTANT:
If the supply voltage phase imbalance is
ilmnediately.
SIZE
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
020-050
060
STAGE 1
(Wl) ON
STAGE 2
(Wl and W2) ON
0.24
0.13
0.36
0.13
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
27
Conductors
and drain wire must be 20 AWG minimum
stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An
aluminum!polyester
100% foil shield and an outer jacket of
PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum
operating temperature range of-20 C to 60 C (-4 F to 140 F) is
required. Table 9 lists cables that meet the requirements.
Staged Gas Control Option Thermistors -- If the unit is
equipped with the staged gas heat option, supply-air thermistors must be installed. Three supply-air thermistors are
shipped with staged gas units and are inside the heating section. The supply-air thennistors should be located in the supply
duct with the following criteria:
• Downstream of the heat exchanger cells
• Equally spaced as far as possible from the heat
exchanger cells
• In a duct location where none of the supply-air thermistors are within sight of the heat exchanger cells
• In a duct location with good mixed supply-air portion of
the unit.
Table 9 -- CCN Connection Approved Shield Cable
SPT (Space Temperature
Sensor) -- For constant volume applications the (_mfortLink TM controls can also be used with
T55 and T56 space temperature sensors that use a 10K thermistor. The T56 sensor also has the capability for a configurable temperature set point offset. For variable air volume applications only the T55 sensor can be used.
Install sensor according
to the installation
instructions
included with accessory sensor. Locate sensor assembly on a
solid interior wall in the conditioned space to sense average
temperature.
Run wiring to the space sensor as shown in Fig. 21.
Note that when the remote sensor is used, the red jumper
wires provided must be connected from TB4 terminal 4 to 5
and TB4 terminal 5 to 1.
MANUFACTURER
CABLE
Alpha
American
2413 or 5463
A22503
PART NO.
Belden
Columbia
8772
02525
IMPORTANT: When connecting to CCN cmmnunication bus to system elements, use color coding
system for the entire network to simplify installation
and checkout. See Table 10.
Table 10-
Color Code Recommendations
SIGNAL TYPE
CCN BUS CONDUCTOR
INSULATION COLOR
CCN PLUG PIN
NO.
Positive (+)
Ground
RED
WHITE
1
2
BLACK
3
Negative
(-)
If a cable with a different color scheme is selected, a similar
color code should be adopted for the entire network. At each
system element, the shields of the colmnunication
bus cables
must be tied together. If the colrnnunication
bus is entirely
within one building, the resulting continuous shield must be
connected to a ground at one point only. If the colmnunication
bus cable exits from one building and enters another, the
shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building
(one point per building only).
To connect the unit to the network:
Both the T55 and T56 have a CCN colrnnunications port and
this should be wired to the CCN Colmnunications
TB3 board if
it is desired to have access to the CCN system through the sensor. If more than one T-55 sensor is being used and averaged,
sensors must be wired in multiples of 4 or 9 as shown in Fig. 22.
T58 Colmnunicating
Thermostat
-- Carrier also has a fully
COlrnnunicating thermostat which, if used, will be wired to the
CCN communication
connections on TB3 as described in the
Carrier Comfort Network :R:Interface section below.
Carrier Comfort Network Interface -- The rooftop units can
be connected to the CCN system. The colrununication bus
wiring is supplied and installed in the field. Wiring consists of
shielded, 3-conductor cable with drain wire. The system
elements are connected to the colmnunication bus in a daisy
chain arrangement. The positive pin of each system element
colmnunication connector must be wired to the positive pins of
the system element on either side of it, the negative pins must be
wired to the negative pins, and the signal pins must be wired to
signal ground pins. Wiring connections for CCN system should
be made at the TB3 terminal block using the screw terminals.
The TB3 board also contains an RJ14 CCN plug that can be
used to connect a field service computer or other CCN device
temporarily. There is also an RJ14 LEN (local equipment network) connection that is used to connect a Navigator device or
download software.
1.
Turn offpower
to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (-) conductors. (If a different network color scheme is used, substitute appropriate colors.)
3.
Remove the 3-pin male plug from the base control board
in the main control box, and connect the wires as follows:
a.
Insert and secure
the 3-pin plug.
b.
Insert and secure the white (ground) wire to terminal 2 of the 3-pin plug.
Insert and secure the black (-) wire to terminal 3 of
the 3-pin plug.
c.
the red (+) wire to terminal
TM
FIELD-SUPPLIED
T55 SPT
THERMOSTAT
T56 SPT
LIGHT
1
2
3
4
5
6
7
'1 I
8
TB4
Fig. 20 -- Field Control Thermostat Wiring
UNIT
TB5
DDDD[]
%%DD%
Fig. 21 -- Space Temperature Sensor Wiring
28
1 of
4. Insert the plug into the existing 3-pin mating connector on
the base module in the main control box.
changeover
using outdoor dry bulb, differential
outdoor enthalpy and differential enthalpy.
VAV Units With Heat -- For variable air volume units that
will use heat, the variable air volume terminals should be
interlocked with the unit at TB5 terminals 1 and 2.
dry
bulb,
Remote Occupancy Switch -- For interface to other building
management systems the control also supports a switch input
for remote occupancy signals. This wiring should be connected
to terminal TB6 terminal 1 and 3.
Demand Ventilation -- The unit can be equipped with a CO2
sensor for use in demand ventilation. This can be factory
supplied and will be mounted in the return duct. It can also be
field supplied and mounted in the return duct or in the space.
Connect the field-installed 4 to 20 mA sensor to TB5 terminals
6 and 7. Do not remove the factory-installed
182-olun resistor.
Remote Economizer
Minimum Position Control
-- If the
(_mfortLink control is controlling the economizer, but a remote
minhnum position is required, then an external 100K potentiometer can be connected to TB5 tenninal 6 and 7. Remove the
factory-installed
182-olun resistor.
If an outdoor air quality sensor is used then it should be
wired to terminal 11 and 12 on TB6. This will require the use
of the optional controls expansion module.
Smoke Sensor Interface -- The (_mfortLink
control includes
an optional factory-installed return air smoke detector. Remote
alarm circuits can be wired to TB5 terminal 8 and 9.
Remote IAQ Ovemde -- If the control is being used with non
Carrier building management system it supports the use of the
remote IAQ ovemde switch. This should be connected to
TB6 terminal 13 and 14. Use of this will require the optional
controls expansion module.
Fire Shutdown and Smoke Control -- The control supports
interface to fire and smoke control systems and allows for the
following system ovemdes from remote switch inputs.
• Fire Shutdown -- Connect to TB6 terminals 8 and 9.
• Smoke Pressurization
-- Connect to TB6 terminals
12 and 13. This requires the use of the optional controls expansion module.
• Smoke Evacuation-Connect to TB6 terminals 12 and
14. This requires the use of the optional controls expansion module.
• Smoke Purge -- Connect to TB6 terminals 12 and 15.
This requires the use of the optional controls expansion
module.
Remote Economizer
Position Control -- The (_mfortLink TM
controls will normally control the position of the economizer,
but it can also support field control of the economizer position
through a 4 to 20 mA signal. If this is used it should be connected to TB5 terminal 6 and 7. If the signal is a 4 to 20 mA
signal then leave the 182-olun resistor in place.
Remote Economizer
Enable -- If the control is being used
with other building management systems and the system will
control the enabling and disabling of the economizer free cooling, this switch input can be connected to TB6 terminals 1 and
2. Note that the controls also support integrated economizer
TB5
Demand Limiting -- The control can also be used with demand
limiting control from remote building management systems. If a
two-stage system is going to be used with redline lhniting where
the machine is not allowed to increase load and load shed where
[
.....................
RED
r..................................................
_ .........................................
D oL, .--, r
i
L2YjY
SENSOR 1
SENSOR 2
SPACE TEMPERATURE
SENSOR 3
AVERAGING
i.........
i
SENSOR 4
(4 SENSOR APPLICATION)
TB5
[]
..............
U...............
U.........
'U ...................
U...............
U...........
..........
[J U..............
U...........
SENSOR1
!
i
SENSOR2
SENSOR3
SENSOR5
SENSOR6
SENSOR 8
SENSOR 9
SENSOR4
SENSOR 7
SPACE TEMPERATURE
AVERAGING
(9 SENSOR APPLICATION)
NOTE: Use T55 sensor only.
Fig. 22 -- Space
Temperature
29
Averaging
Wiring
the load is decreased to a configurable lhnit in capacity then these
can be connected to TB6 terminals 4 and 5, and 5 and 6. This requires use of the controls expansion module.
Step 9 E Make Outdoor-Air
13. Attach 9 green speed clips (provided) to hood side panels
without slots. Engagement section of clip faces up and towards the outside of the hood side panels.
14. Attach remaining mounting angle (with tabs) to other end
of the filter track with no. 10 screws provided. See
Fig. 31.
15. Place filter track assembly in bottom of hood by placing
tabbed end into slotted side (with tab on bottom) and
attaching opposite end to hood with speed clips and
gasketed screws provided. Tabs can be hand bent after
they have been inserted into the side.
NOTE: The filter track assembly end with screws should face
away from the other hood when mounted on the unit. Be sure
the filters are installed with the airflow in the correct direction.
Inlet Adjustments
ECONOMIZER
AND
FIXED
OUTDOOR
AIR
DAMPER -- Hoods are used on all units with economizer or
adjustable self-closing fixed outdoor air damper.
NOTE: If accessory power exhaust or barometric relief packages are being added to the unit, install power exhaust or barometric relief before installing economizer hoods.
Economizer Hood Assembly
-- The economizer
hood is
shipped in a package secured to the outside of the unit. The
hood assemblies must be field-assembled.
The 48A4,A5 units
are side supply and side return. The return duct lhnits access to
economizer filters from below. Filter tracks (mounting angle
without tabs) must be installed correctly to allow access to
economizer filters from each side.
NOTE: Tabs from both filter tracks will be in the same space.
After one filter track has been inserted into hood side, bend the
tabs so they will not interfere with installation of the center
hood.
The 48A2,A3,A4,A5020-050
units have two hoods on every unit. Each hood has two lower filter tracks, one slotted side
and one side without slots. Construct the assembly so that the
slotted side is adjacent to the other hood when mounted on the
unit.
16.
17.
The 48A2,A3,A4,A5060
units have 3 hoods on every unit.
Each hood has two lower filter tracks, one slotted side and one
side without slots. Construct the two outer hood assemblies so
that the slotted sides are adjacent to the center hood when
mounted on the unit.
Step 10 E Position Power Exhaust/Barometric
Relief Damper Hood -- All units are shipped with the
hoods folded inside the unit in a shipping position. For 48A2,
and A3 units the hood must be tilted out once the unit is installed. On 48A4, A5 units, (designed for horizontal supply and
return) the assemblies will have to be relocated to return ductwork. See Fig. 33 for dimensions and details.
NOTE: Before assembly of the economizer hood, check along
the outer edges of the economizer assembly for any seal strip
protruding past the flanges. Trim the excess seal strip so that it
is flush with the economizer assembly flanges.
Perform the following
hood.
procedure
to assemble
Attach black seal strip (provided) to filter cover. Seal strip
should be applied centered over the holes of the one
flange, making sure to fully cover holes and centered over
the other large flange. See Fig. 32.
Slide two 20 x 25-in. filters into cross members of hood
assembly. Attach filter cover over filters with screws and
speed clips provided.
the economizer
All electrical connections have been made and adjusted at
the factory. The power exhaust blowers and barometric relief
dampers are shipped assembled and tilted back into the unit for
shipping. Brackets and extra screws are shipped in shrink wrap
around the dampers. If ordered,
each unit will have 4
(48A2,A3,A4,A5020-050
units) or 6 (48A2,A3,A4,A5060
units) power exhaust blowers and motors or barometric relief
dampers.
1. Apply black seal strip (provided) to outside top-edge of
hood sides. Wrap seal strip over edge to cover top flange
(6 hood sides). Make sure seal strip covers screw holes.
Allow strip to overhang l/s-in, past the end opposite the
mounting flange. See Fig. 23.
2. Assemble
hood sides, top, and cross lnember with
gasketed screws provided. See Fig. 24.
3. Attach 15 green speed clips (provided) to hood top.
4. Apply black seal strip (provided) to mounting flanges of
hood sides being sure to cover mounting holes. See
Fig. 25.
5. Apply black seal strip (provided) to back of hood top
mounting flange. Seal strip of hood top mounting flange
must press tightly against seal strip of hood side mounting flanges. See Fig. 26.
6. Add gray foam strip (provided) to cross members on bottom tray. See Fig. 27.
7. Place gray foam strip (provided) on inside of slotted hood
side between filter and cross member opposite the mounting end. See Fig. 28.
8. Attach gray foam strip (provided) to block-off baffle on
outer face of flange. See Fig. 29.
9. Remove the screws on each end and along top of damper
assembly of unit. Remove top 4 screws on each side of
filter panel under damper assembly. Set hood assembly in
place and attach to unit using these screws.
10. Remove
screws along bottom of damper assembly.
Locate and mount blockoff baffle using these screws.
11. Assemble 2 filter tracks side-by-side with the assembled
ends together.
12. Attach mounting angle (without tabs) to the assembled
end of the filter track. See Fig. 30.
1. Remove 9 screws holding each dmnper assembly in
place. See Fig. 34. Each damper assembly is secured with
3 screws on each side and 3 screws along the bottom.
Save
screws.
Be careful when tilting blower assembly. Hoods and blowers are heavy and can cause injury if dropped.
2.
3.
4.
5.
Pivot each damper assembly outward until edges of
damper assembly rest against inside wall of unit.
Secure each damper assembly to unit with 6 screws
across top (3 screws provided) and bottom (3 screws
from Step 1) of damper.
With screws saved from Step 1, install brackets on each
side of dmnper assembly.
Remove tape from damper blades.
Step 11 -- Route VAV Static Pressure
Sensors
VAV DUCT PRESSURE
TRANSDUCER
-- The VAV duct
pressure transducer (VAV inverter pressure transducer) is located behind the filter access door on the lower inner panel. See
Fig. 35. A section of field-supplied */4-in. plastic tubing must
be run from the high pressure tap on the differential pressure
switch and connected to a field-supplied tap in the supply-air
duct. The tap is usually located 2/3 of the way out on the main
supply duct. Remove plug button in panel to route robing.
3O
TOP
FLANGE
HOOD
BLACK
SEAL
TOP
HOOD SIDE
HOOD
SIDE
//__
_
Fig. 26 -- Adding Seal Strip to Back of Hood Top
Mounting Flange
Fig. 23 -- Adding Seal Strip to Top of Hood Sides
FILTER
COVER
HOOD SIDE
ECONOMIZER
GRAY
FOAM
STRIP
CROSS MEMBER
FILTERS
CROSSMEMBER-
'MOUNTING
ANGLE
(W/O TABS)
FILTER TRACK
ASSEMBLY
(WITH SCREWS)
SIDE
Fig. 27 -- Adding Foam Strip to Cross Member
BLOCKOFF
BAFFLE
NOTE: Left side economizer hood has mounting angle without tabs
and filter rack assembled end on the opposite side.
HOODSIDE
(SLOTTED)
Fig. 24Economizer Hood Assembly
(Right Side/Center Economizer Hood Shown)
HOOD
MOUNTING
FLANGE
HOOD
SIDE
Fig. 28 -- Adding Foam Strip to Hood Side
Fig. 25 -- Adding Seal Strip to Sides of Hood Top
Mounting Flange
3!
BLACK SEAL STRIP
(CENTERED)
BLOCKOFF
BAFFLE
FILTER COVER
GRAY FOAM STRIP
Fig. 32 -- Attaching Seal Strip to Filter Cover
VAV BUILD1NG PRESSURE
TRANSDUCER
-- The VAV
building pressure transducer (modulating power exhaust pressure transducer) is located behind the filter access door on the
lower inner panel. See Fig. 35. A section of field-supplied
1/4-in. plastic tubing must be run from the high pressure tap on
the differential pressure switch to the conditioned space. The
pressure robe must be terminated in the conditioned
space
where a constant pressure is required. This location is usually
in an entrance lobby so that the building exterior doors will
open and close properly. Remove plug button in panel to route
mbing.
Fig. 29 -- Adding Seal Strip to Blockoff Baffle
MOUNTING ANGLE
(WITHOUT TABS)
FILTER TRACK
ASSEMBLY
The low pressure tap is factory-routed
to the atmosphere.
For a positive-pressure
building, route the high tap to building
air and low tap to atmosphere.
For a negative-pressure
building, route the high tap to atmosphere and the low tap to
building air.
Fig. 30 -- Mounting Angle (Without Tabs)
Attached to Filter Track Assembly
Step 12 -- Install
All Accessories
-After all the
factory-installed
options have been adjusted, install all fieldinstalled accessories. Refer to the accessory installation instructions included with each accessory.
The 48A Series units have a large number of factoryinstalled options which were previously
available only as
accessories. Some of the available options can also be installed
in the field if needed. In most cases the units have been
pre-wired so that the accessories
can be easily installed.
Instructions are shipped with each accessory. Configuration of
the controls for these accessories as well as the factory-installed
options can be found in the Controls, Start-up, Operation,
Service and Troubleshooting
book. The following is a list of
some
of the COlnmon accessories:
....
•
•
•
•
•
•
•
MOUNTING ANGLE
(WITH TABS)
•
•
•
Fig. 31 -- Mounting Angle (With Tabs) Attached to
Filter Track Assembly
32
Thermostats
and space temperature
sensors
LP (liquid propane) conversion kit
Accessory barometric relief damper
Accessory power exhaust
Non-modulating
to modulating power exhaust
Condenser coil hail guards
Outdoor humidity sensor (used for economizer enthalpy
changeover)
Return air humidity
sensors (used for economizer
differential enthalpy changeover)
Return air smoke detector
Controls expansion module (used for interface to building management
systems,
not typically needed on
system with the Carrier Comfort Network R_ [CCN]
system)
ECONOMIZER
HOOD
42.56"
J
LOCATION
BAROMETRIC RELIEF
OR POWER EXHAUST
"SIDE #2"
\
ECONOMIZER
HOOD
\\
\
\
\
\
12.94
(UNIT
)PENING)
J BOX
PLENUM
RATED
CABLE
(FIELD
SUPPLIED)
ALTERNATE
LOCATION
J BOX
(END)
NOTE:
027-050
SIZES
SIZE 060 HAS
UNIT
SIZES
SHOWN
3 POWER
HAVE
THE
(2 POWER
EXHAUST
EXHAUST
FANS).
FANS.
ALL
SAME
POWER
SIZE
EXHAUST.
Fig. 33 -- Power Exhaust Relocated to Side Return Duct
I"
142.58
_0.90
____°jL% i
-11.03----"
'k
_
i
°
o
-L-_?
2_L
31
_,o19
..
NOTES:
1. Unless otherwise
specified,
2. Dimensions are in inches.
3, On 48A4,A5 units, accessory
23.24
L1.38
all dimensions
are to outside
of part.
barometric relief or power exhaust must be mounted in the field-supplied
return ductwork,
Fig. 34 -- Barometric Relief Damper and Power Exhaust Mounting Details
33
Conversion to horizontal return requires that the bottom
return openings of the unit must be sealed with airtight panels
capable of supporting the weight of a person. The return
ductwork connection locations on the side of the unit are higher
than normal (31-m. high). Unit-mounted power exhaust or
barometric relief cannot be used because of return air ductwork
will cover the power exhaust or barometric relief installation
locations. Power exhaust or barometric relief may be installed
in the return air ductwork.
To convert the unit, perform the following:
1. Seal the bottom return openings of the unit with airtight
panels capable of supporting the weight of a person.
AUXILIARY
CONTROL BOX
2.
Remove
the panels located below the economizer
outdoor-air dampers. These openings will be used for the
return-air ductwork. There are 2 panels on 48A2,A3020050 units. There are 3 panels on 48A2,A3060
units.
These openings are normally used for power exhaust or
barometric relief.
3.
Run the return air ductwork up to the openings. One
single duct is recolrnnended
to connect to the unit over
the return air openings. See Fig. 36. The return duct must
incorporate a minimum 3/4-in. flange for connection to
the unit cabinet. The unit does not have duct flanges for
this conversion.
PRESSURE TRANSDUCERS
(INSIDE OF PANEL)
Fig. 35 -- Pressure
Transducer
Locations
• Plugged filter sensor
• MotormasteKR)V low ambient head pressure control
IMPORTANT:
Carrier recommends
the installation of
field-fabricated
wind baffles on all vertically oriented
condenser coils when operating in enviromnents
with
prevailing winds of more than 5 MPH and where temperatures
drop below 32 F. See the Motormaster
accessory installation guide for instructions.
Side Supply
and Return
Units (48A4.A5)
With FieldInstalled Power Exhaust in Return Duct -- Space must be
available in the return duct to mount the power exhaust fan
(gravity relief) modules. Dimensions and suggested locations
are shown in Fig. 36. These instructions are a guideline and not
a comprehensive
procedure. The design contractor must provide some design initiative.
Step 13 E Field Modifications
The wiring harness that is provided with the power exhaust
accessory is not long enough for the fan modules to be mounted in the return air duct. Field-supplied wiring must be spliced
into the harness. Use a junction box at each splice. The wiring
may be mn in the return duct, or externally in conduit. A service access panel will be needed near each power exhaust fan.
DUCTWORK
Bottom Return Units (48A2 and A3) Field-Modified
for
Side Return -- The 48A2 and A3 units with bottom return air
connections may be field-modified
air connections.
to accolrnnodate
side return
IMPORTANT: The following section is a guideline and not
a comprehensive
procedure to field modify the units. The
installing contractor must provide some design initiative.
Field-conversion
is complex and is not recommended.
34
97.78"
(027-050),
150.4T'
INSIDE
DIMENSION
(060)
31.25"
INSIDE
Fig. 36 -- Side Return Air Conversion
35
Copyright 2008 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480051-01
Printed in U.S.A.
Form 48A-6SI
Pg 36
5-08
Replaces: 48A-4Sl
Source Exif Data:
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