Step 13 -- Check Belt Tension57...................
START--UP CHECKLIST59.......................
)Sensor37.............
2
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory-- authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Re ad these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
nationalelectricalcodes(in USA, ANSI/NFPA70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
safety--alert symbol
unit and in instructions or manuals, be alert to the
potential for personal injury.
. When you see this symbol on the
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, always turn off main power switch to unit and
install lockout tag. Unit may have more than one
power switch.
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr (R--410A) refri gerant systems operate at
higher pressures than standard R--22 systems. Do not
use R--22 service e quipment or components on Puron
refrigerant equipment.
!
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pre ssure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
air conditioning equipment.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety--alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
2
Rated Indoor Airflow (cfm)
The table to the right lists the rated indoor airflow used
for the AHRI efficiency rating for the units covered in thi s
document.
Model NumberFull Load Airflow (cfm)
50TC*A082400
50TC*D/E082250
50TC*A093000
50TC*D/E093400
50TC*A123600
50TC*D/E123000
50TC*D/E143600
Position:
Example:
1234567891011 12 13 14 15 16
50TC-A08A1A5-0A0A 0
Unit Heat Type
50 - Electric Heat
Packaged Rooftop
Model Series - WeatherMaker
®
TC - Standard Efficiency
Heat Options
- = No Heat
Refrig. Systems Options
A = Standard One Stage Cooling Models
(sizes 08-12)
D = Two Stage Cooling Models
E = Two Stage Cooling Models with Al/Cu
Condenser Coils and Humidi-MiZer
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu -Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Coil Options – Novation
®
(Outdoor - Indoor - Hail Guard)
G = Al/Al - Al/Cu
H = Al/Al - Cu/Cu
J = Al/Al - E-coat Al/Cu
K = E-coat Al/Al - Al/Cu
L = E-coat Al/Al - E-coatAl/Cu
T = Al/Al - Al/Cu — Louvered Hail Guard
U = Al/Al - Cu/Cu — Louvered Hail Guard
V = Al/Al - E-coat Al/Cu — Louvered Hail Guard
W = E-coat Al/Al - Al/Cu — Louvered Hail Guard
X = E-coat Al/Al - E-coat Al/Cu — Louvered Hail Guard
Fig. 1 -- 50TC 08--12 Model Number Nomenclature (Example)
17 18
Packaging and Seismic Complience
0 = Standard
1 = LTL
3 = California Seismic Compliant Label
4 = LTL and CA Seismic Compliant Label
Electrical Options
A = None
C = Non-Fused Disconnect
D = Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
G = 2-Speed Indoor Fan Controller (VFD)
J = 2 Speed Indoor Fan Controller (VFD)
and Non-Fused Disconnect
K = 2-Speed Indoor Fan Controller (VFD)
and Thru-The-Base Connections
M = 2-Speed Indoor Fan Controller (VFD)
with Non-Fused Disconnect and
Thru-The-Base Connections
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
U = Temperature Ultra Low Leak Economizer
w/ Barometric Relief
W = Enthalpy Ultra Low Leak Economizer
w/ Barometric Relief
Base Unit Controls
0 = Electromechanical Controls can be used with W7212
EconoMi$er
®
IV (Non-Fault Detection and Diagnostic)
1 = PremierLink™ Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical w/ 2-Speed Fan and W7220
Economizer Controller Controls. Can be used with
W7220 EconoMi$er X (w/ Fault Detection and Diagnostic)
D = ComfortLink Controls
Design Revision
- = Factory Design Revision
Voltage
1 = 575/3/60
5 = 208-230/3/60
6 = 460/3/60
50TC
C150007
3
50TC
Fig. 2 -- Unit Dimensional Drawing – 08, 09 and 12 Size Units
4
C10310A
50TC
Fig. 2 -- Unit Dimensional Drawing – 08, 09 and 12 Size Unit (cont.)
5
C10311A
50TC
Fig. 3 -- Unit Dimensional Drawing – 14 Size Unit
6
C09652A
50TC
Fig. 3 -- Unit Dimensional Drawing – 14 Size Unit (cont.)
7
C10327A
C
D
B
A
50TC
LOCATI ONDIMENSIONCONDITION
48---in (1219 mm)
A
B
C
D
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
18---in (457 mm)
18---in (457) mm
12---in (305 mm)
42---in (1067 mm)
36---in (914 mm)
Special
36---in (914 mm)
18---in (457 mm)
48---in (1219 mm)
42---in (1067 mm)
36---in (914 mm)
Special
planning overhead obstruction or for vertical clearances.
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non - -- conductive (e.g., wood, fiberglass)
Check sources of flue products within 10--- ft of unit fresh air intake hood
Side condensate drain is used
Minimum clearance
No flue discharge accessory installed, su rface is combustible material
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non - -- conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10 --- ft (3 m) of this unit’s flue outlet
Fig. 4 -- Service Clearance Dimensional Drawing
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installation requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for the minimum clearances
required for safety. This includes the clearance to
combustible surfaces, unit performance and service access
below, around and above unit as specified in uni t
drawings. See Fig. 4.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood floor in g or on Class
A, B, or C roof--covering material when roof curb is used.
C08337
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate height
to allow installation of condensate trap per requirements.
RefertoStep9—InstallExternalCondensate Trap and
Line – for required trap dimensions.
Roof mount —
Checkbuildingcodesforweightdistribution
requirements. Unit operating weight is shown in Table 1.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for t he steps of unit i nstallation. For example,
on curb--mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service c onnection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (see Step 9 for deta ils)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--mounted installation —
Frame--mounted applic ations generallyfollow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that volta ge, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 6. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket supplied with the roof
curb as shown in Fig. 6. Improperly applied gasket can also
result in air leaks and poor unit performance.
Curb should be l evel. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 5. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
C06110
Fig. 5 -- Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru--the--base power package
must be installed before the unit is set on the roof curb.
If electric and control wiring is to be route d through the
basepan, attach the accessory thru--the--base service
connections to the basepan in accordance with the
accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of 6
in. (150 mm) beyond unit cabinet. Install a gravel apron in
front of condenser coil air inlet to prevent grass and
foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb
if required.
Alternate Unit Support (In Lieu of Curb or Slab
Mount) —
A non--combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit with a minimum of 3 equally spaced 4--in. x
4--in. (102 mm x 102 mm) pads on each side.
50TC
9
1-3/4"
TYP
[44.5]
C
50TC
ACCESSORY CONVENIENCE
OUTLET WIRING CONNECTOR
FITTING
1/2" [12.7] NPT1/2" [12.7] NPT
CONTROL WIRING
FITTING
POWER WIRING
3/4" [19] NPT1 1/4" [31.7] NPT
THRU THE CURB
CRBTMPWR004A01THRU THE BOTTOM
CRBTMPWR002A01
CONNECTOR PKG. ACC. GAS CONNECTION TYPEGAS FITTING
1 3/4"
[44.5]
1.00"
[25.4]
12-1/2" [317.5] WIDE
INSULATED DECK PANELS
INSULATED DECK PANEL
9-15/16" [252.4] WIDE
"A"
1 3/4"
[44.4]
SEE NOTE #2
2-3/8"
[61]
20-3/4"
[513]
INSIDE
GAS SERVICE PLATE
THRU THE CURB
DRILL HOLE
2" [50.8] @
ASSEMBLY (IF
REQUIRED)
(SEE NOTE #8)
SECTION THRU SIDE
RETURN AIR
SUPPLY AIR
UNIT
[1987.5]
6' 6-1/4"
4' 2"
[1270.0]
"A"
NAIL (FIELD SUPPLIED)
TYPICAL (4) SIDES
7/16"
CERTIFIED DRAWING
SEE VIEW "B"
ROOFING FELT
(FIELD SUPPLIED)
COUNTER FLASHING
(FIELD SUPPLIED)
[11]
CURB ASY, ROOF
THIS DOCUMENT AND THE INFORMATION CONTAINED THEREIN
IS PROPRIETARY TO CARRIER CORPORATION AND SHALL NOT
BE USED OR DISCLOSED TO OTHERS, IN WHOLE OR IN PART,
WITHOUT THE WRITTEN AUTHORIZATION OF CARRIER CORPORATION.
1029120
TOLERANCES ON:
AUTHORIZATION NUMBERTITLE
DIMENSIONS ARE IN INCHES
----
UNLESS OTHERWISE SPECIFIED
1 DEC 2 DEC 3 DECANG
PRODUCTION
---
MATERIAL
DRAWING RELEASE LEVEL:
THIRD ANGLE
PROJECTION
ROOFING MATERIAL
(FIELD SUPPLIED)
CANT STRIP
(FIELD SUPPLIED)
RIGID INSULATION
SHEET 5 OF 5
50HJ405012
SIZE DRAWING NUMBERREV
D
-
-
-
DRAFTERCHECKER
ENGINEERINGMANUFACTURING
MMC 12/16/09 --
-
-
T-005, Y-002
WEIGHT:
-PURCH-N/A-
ENGINEERING REQUIREMENTS
SURFACE FINISH MFG/PURCHMODEL (INTERNAL USE ONLY)NEXT DRAWINGSCALEDISTRIBUTION
5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB).
6. SERVICE CLEARANCE 4 FEET ON EACH SIDE.
7. DIRECTION OF AIR FLOW.
8. CONNECTOR PACKAGE CRBTMPWR002A01 IS FOR THRU-THE-CURB GAS TYPE
PACKAGE CRBTMPWR004A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.
53 1/2"
[1358.9]
11.42"
[290.0]
A
14"
24"
[356]
[610]
26"
[660.4]
6 3/64"
ROOF CURB
ACCESSORY #
CRRFCURB003A01
CRRFCURB004A01
[153.5]
1 3/4"
[44.4]
4 3/16"
[106.0]
81 3/4"
[827.1]
32 9/16"
[2076.3]
3"
40 3/16"
[76.2]
[1020.8]
VIEW "B"
CORNER DETAIL
[585.8]
23 1/16"
OPENING
RETURN AIR
OPENING
SUPPLY AIR
1 3/4"
[44.5]
[401.6]
15 13/16"
DUCT
GASKET
(FIELD SUPPLIED)
(SUPPLIED WITH CURB)
15 15/32
[392.9]
[800.9]
31 17/32"
1 3/4"
[44.5]
6' 61/4" WAS 6' 7 1/6", 4'2' WAS 4' 2 13/16";
18 GA WAS 16 GA.; 15 13/16" WAS 15 15/16"; NAIL
FIELD SUPPLIED WAS WITH CURB
C
SUPPLY AIRRETURN AIR
1/4"
[7.0]
[115.5]
4 9/16"
Fig. 6 -- Roof Curb Details
10
C13311
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For Units with Accessory Electric Heaters —
All installations require aminimum clearance to
combustible surfaces of 1--in (25 mm) from duct for first
12--in (305 mm) away from unit.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional
dimensions are equal to or greater than the unit supply
duct opening dimensions for the first 18 in. (458 mm) of
duct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor ba rrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
!
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage
to roofing materials.
Membrane roofs can be cut by sharp sheet metal
edges. Be careful when placing any sheet metal parts
on such roof.
Outlet grilles must not lie directly below unit discharge.
!
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal
injury.
For vert ical supply and return units, tools or parts
could drop into ductwork and cause an injury. Install
a 90--degree turn in the return ductwork between the
unit and the conditioned space. If a 90--degree elbow
cannot be installed, then a grille of sufficient strength
and density should be installed to prevent objects
from falling into theconditioned space. Due to
electric heater, supply duct will require 90--degree
elbow.
50TC
UNIT
50TC ---A08129058688.0223540.0101541.51055
50TC ---A09141064188.0223539.5100549.51255
50TC ---A12151568988.0223541.0104049.51255
50TC ---D/E08141064188.0223541.0104041.51055
50TC ---D/E09152569388.0223540.5103049.51255
50TC ---D/E12156571188.0223540.0101549.51255
50TC ---D/E14172078288.0223528.572553.01345
NOTES:
1. Dimensions in ( ) are in millimeters.
2. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.
3. H ook rigging shackles through holes in base ra il, a s show n in deta il “A.” H oles in base rails are centered around the unit center of gravity.
Use wooden top to prevent rigging straps from damaging unit.
MAX WEIGHT
LBKGINMMINMMINMM
ABC
DIMENSIONS
Fig. 7 -- Rigging Details
11
C06005
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used to
move unit across a roof. Level by using unit frame as a
reference. See Table 1 and Fig. 7 for additional information.
Lifting holes are provided in base rails as shown in Fig. 7.
Refer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood) must be
removed PRIOR to placing the unit on the roof curb.
When using the standard side drain connec tion, ensure the
red plug in the alternate bottom connection is tight. Do
this before setting the unit in place. The red drain pan can
be tightened with a
For further details see Step 9 -- Install External
Condensate Trap and Line on page 14.
Before setting the unit onto the curb, recheck gasketing on
curb.
50TC
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
PositioningonCurb—
Position unit on roof curb so that the following
clearances are maintained:
between the roof curb and the ba se rail inside the front
and back, 0.0 in. clearance between the roof curb and
the base rail inside on the duct end of the unit. This will
result in the distance between the roof curb and the base
rail i nside on the condenser end of the unit being
approximately
1
/2--in. square socket drive extension.
CAUTION
1
/4in. (6.4 mm) clearance
1
/4in. (6.4 mm).
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
C06108
Fig. 8 -- Horizontal Conversion Panels
Step 8 — Install Outside Air Hood
Economizer and Two Position Damper Hood
Package Removal and Setup -- Factory Option
1. The hood is shipped in knock--down form and must be
field assembled. The indoor coil access panel is used as
the hood top while the hood sides, divider and filter are
packaged together, attached to a metal support tray using plastic stretch wrap, and shipped in the return air
compartment behind the indoor coil access panel. The
hood assembly’s metal tray is attached to the basepan
and also attached to the damper using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
FILTER ACCESS PANEL
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove riggi ng skids and
shipping materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation--side down. Seals around
duct openings must be tight. See Fig. 8.
Field--supplie d flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
INDOOR COIL ACCESS PANEL
C10146
Fig. 9 -- Typical Access Panel Locations
3. Locate the (2) screws holding the metal tray to the
basepan and remove. Locate and cut the (2) plastic
tie--wraps securing the assembly to the damper. (See
Fig. 10.) Be careful to not damage any wiring or cut
tie--wraps securing any wiring.
12
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per the
steps outlined in Economizer Hood and Two–PositionHood, below.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C08639
Fig. 10 -- Economizer and Two--Position Damper
Hood Parts Location
TOP
PANEL
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
Fig. 11 -- Indoor Coil Access Panel Relocation
TOP
PANEL
C06025
50TC
Economizer Hood and Two--Position H ood —
NOTE: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be
used and must be discarded. Save the aluminum filter for
use in the power exhaust hood assembly.
1. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 11.
2. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Use the screws
provided to attach the hood sides to the hood top. Use
screws provided to attach the hood sides to the unit. See
Fig. 12.
3. Remove the shipping tape holding the economizer
barometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See
Fig. 12 and 13. Secure hood divide r with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath t he
hood top. Insert the alumi num filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 13.
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.
LEFT
HOOD
SIDE
19 1/16”
B
(483mm)
HOOD DIVIDER
SCREW
33 3/8”
Fig. 12 -- Economizer Hood Construction
DIVIDER
OUTSIDE
AIR
CLEANABLE
ALUMINUM
FILTER
FILTER
INDOOR COIL
ACCESS PANEL
(848mm)
HOOD
C06026
BAROMETRIC
RELIEF
13
Fig. 13 -- Economizer Filter Installation
FILTER
CLIP
C08634
Step 9 — Install External Condensate Trap and
Line
The unit has one3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 14. Unit airflow confi guration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
To use the al ternate bottom drain connection, remove the
red drain plug from the bottom connection (use a
square socket drive extension) and install it in the side
drain connection.
50TC
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
DRAIN
PLUG
(FACTORY-INSTALLED)
Fig. 14 -- Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 15.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
TO ROOF
DRAIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102mm) trap is recommended.
BASE RAIL
OPEN
VENT
3˝ (76mm)
MIN
DRAIN PLUG
Fig. 15 -- Condensate Drain Piping Details
All units must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. Ifdrain lineis installed
downstream from the external trap, pitch the line away from
the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do not use
a pipe size smaller than the unit connection (
ALTERNATE
BOTTOM DRAIN
3
/4-in.).
1
/2-- i n .
C08021
SEE NOTE
ROOF
CURB
C11291
Step 10 — Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabinetmusthaveanuninterrupted,unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control com partment, or condui t
approved for electrical ground when installed in
accordance with NEC (National Electrical Code);
ANSI/NFPA 70, latest edition (in Canada, Canadian
ElectricalCodeCSA[CanadianStanda rds
Association] C22.1), and local electrical codes.
NOTE: Check all factory and field electrical connections
for tightness. Field--supplied wiring shall conform with
the limitations of 63_F(33_C) rise.
Field Power Supply —
If equipped with optional Powered Conve nience Outlet:
The power source leads to the convenience outlet’s
transformer primary are not factory connected. Installer
must connect these leads according to required operation
of the convenience outlet. If an always--energized
convenience outlet operation is desired, connect the
source leads to the line side of the unit--mounted
disconnect. (Check with local codes to ensure this method
is acceptable in your area.) If a de--energize via unit
disconnect switch operation of the convenience outlet is
desired, connect the source leads to the load side of the
unit disconnect. On a uni t without a unit--mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan contactor IFC pressure lugs
with unit field power leads.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the
connection and moving it to the 208-v
terminal on the primary side of the transformer. Refer to
unit label diagram for additional informat ion. Field power
wires will be connected line--side pressure lugs on the
power terminal block or at factory--installed option
non--fused disconnect.
Field power wires are connected to the unit at line--side
pressure lugs on compressor contactor C and indoor fan
contactor IFC (see wiring diagram label for control box
component arrangement) or at factory--installed option
non--fused disconnect switch. Max wire size is #4 AWG
(copper only).
1
/4-in. female spade connector from the 230--v
1
/4-in. male
14
NOTE:TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points on
contactor C or optional disconnect switch. These leads are
for factory run--test purposes only; remove and discard
before connecting field power wires to unit connection
points. Make field power connections directly to line
connection pressure lugs only.
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and furnace. Use only copper wire.
(See Fig. 16.)
ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
To field install the NFD shaft and handle:
1. Remove the unit front pane (see Fig. 2 and 3).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the left side cover.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at
OFF position (the arrow on the black handle knob is
at OFF).
5. Insert the shaft with the cross pin on the top of the shaft
in the horizontal position.
6. Measure from the tip of the shaft to the top surface of
the black pointer; the measurement should be 3.75 to
3.88 in. (95 to 99 mm).
7. Tighten the locking screw to secure the shaft to the
NFD.
8. Turn the handle to the OFF position with red arrow
pointing at OFF.
9. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
10. Secure the handle to the paint ed cover with (2) screws
and lock washers supplied.
11. Engaging the shaft into the handle socket, re--install
(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
50TC
ALUMINUM
WIRE
A93033
Fig. 16 -- Disconnect Switch and Unit
Units with Factory--Installed Non--Fused Disconnect —
The factory--installed option non--fused disconnect (NFD)
switch is located in a weatherproof enclosure located
under the main control box. The manual switch handle and
shaft are shipped in the disconnect enclosure. Assemble the
shaft and handle to the switch at this point. Discard the
factory test leads (see Fig. 19).
Connect field power supply conductors to LINE side
terminals when the switch enc losure cover is removed to
attach the handle.
C12279
Fig. 18 -- Handle and Shaft Assembly for NFD
C12284
Fig. 17 -- Location of Non--Fused Disconnect Enclosure
15
Units Without Factory--Installed
Non-- Fused Disconnect —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
All Units —
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informative plate. See Fig. 19 for power wiring
connections to the unit power terminal block and
equipment ground. Maximum wire size is #4 ga AWG per
pole.
Units Without Disconnect Option
50TC
CIFC
1313
11
Disconnect
per
NEC
L1
L2L3
208/230-3-60
460-3-60
575-3-60
Units With Disconnect Option
Factory
Wiring
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On
3--phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the formula
shown in the legend for Tables 10 and 11, Note 3 (see
page 55) to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical compone nts. Such operation would invalida te
any applicable Carrier warranty.
NOTE: Check all factory and field electrical connections
for tightness.
Convenience Outlets —
!
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience out let circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for servi ce. Locate
its disconnect switch, if appropriate, and open it.
Tag--out this switch, if necessary.
Tw o types of convenience outlets are of fered on 50TC
models: Non--powered and unit--powered. Both types
provide a 125--volt GFCI (ground--fault circuit--interrupter)
duplex receptacle rated at 15--A behind a hinged waterproof
access cover, located on the end panel of the unit. See Fig.
20.
13 5
Optional
Disconnect
Switch
24 6
L1L2L3
Disconnect factory test leads
and discard.
C09349
Fig. 19 -- Power Wiring Connections
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over--current Protection) device size.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to
be connected to a 208-v power supply, the control
transformer must be r ewir ed by moving the black wire with
1
/4-in. female spade connector from the 230--v
the
connection and moving it to the 208-v
1
/4-in. male termina l
on the primary side of the transformer. Refer to unit label
diagram for additional information.
Pwd-CO
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Control Box
Access Panel
Transformer
C08128
Fig. 20 -- Convenience Outlet Location
InstallingWeatherproofCover:Aweatherproof
while-in-use cover for the factory-installed convenience
outlets is now required by UL standards. This cover
cannot be factory-mounted due its depth; it must be
installedatunitinstallation.Forshipment,the
convenience outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit include s the hinge d cover, a backing plate
and gasket.
16
DISCONNECTALLPOWERTOUNITAND
CONVENIENCE OUTLET. LOCK--OUT AN D TAG--OUT
ALL POWER.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
1
approximately
/2-in (13 mm) under screw heads a re
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw hea ds at the keyhole slots
and align with the gasket; tighten the two screws until
snug (do not over-tighten).
Mount the weatherproof cover to the ba cking plate as
shown in Fig. 21. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
COVER – WHILE-IN-USE
WEATHERPROOF
RECEPTACLE
NOT INCLUDED
BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 21 -- Weatherproof Cover Installation
Non-- powered type: Thistyperequires thefield
installation of a general--purpose 125--volt 15--A circui t
powered from a source elsewhere in the building. Observe
national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and
location. Route 125--v power supply conductors into the
bottom of the utility box containing the duplex receptacle.
Unit--powered type: A unit--mounted transformer is
factory--installed to stepdown the main power supply
voltage to the unit to 115--v at the duplex receptacle. This
option also includes a manual switch with fuse, located in
a utility box and mounted on a bracket behind the
convenience outlet; access is t hrough the unit’s control
box access panel. See Fig. 20.
The primary leads to the convenience outlet transformer
are not factory--connected. Selection of primary power
source is a customer--option. If local codes permit, the
transformer primary leads can be connected at the
line--side terminals on the unit--mounted non--fused
disconnect or HACR breaker switch; this will provide
service power to the unit when the unit disconnect switch
or HACR switch is open. Other connection methods will
result in the convenience outlet circuit being de--energized
when the unit disconnect or HACR switch is open. See
Fig. 22.
C08283
UNIT
VOLTAGE
208,
230
460480
575600
CONNECT
AS
240
PRIMARY
CONNECTIONS
L1: RED +YEL
L2: BLU + GRA
L1: RED
Splice BLU + YEL
L2: GRA
L1: RED
L2: GRA
TRANSFORMER
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
Fig. 22 -- Powered Convenience Outlet Wiring
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T--15, non--renewable screw-- in (Edison base)
type plug fuse.
Using unit--mounted convenience outlets: Units with
unit--mount ed convenience outlet circuits will often
require that two disconnects be opened to de--energize all
power to the unit. Treat all units as electrically energized
until the convenience out let power is also checked and
de--energization is confirmed. Observe National Electrical
Code Article 210, Branch Circuits, for use of convenience
outlets.
50TC
17
Factory--Option Thru--Base Connections —
This service connection kit consists of a
1
bulkhead connector and a 1
/4--in electrical bulkhead
1
/2--in electrical
connector, all factory--installed in the embossed (raised)
section of the unit basepan in the condenser section. The
1
/2--in bulkhead c onnector enables the low--voltage control
wires to pass through the basepan. The 1
1
/4--in electrical
bulkhead connector allows the high--voltage power wires
to pass through the basepan. See Fig. 24.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
50TC
CONNECTOR
Fig. 24 -- Thru--Base Connection Fittings
C13412
Thermostat —
Install a Carrier--approved accessory thermostat accordin g to
installation instructions included with the accessory. For
complete economizer function, select a two--stage cooling
thermostat. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24--v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24--v source (no “C”
connection required), use a thermosta t cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire [35_C(95_F)
minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWG
insulated wire [35_C(95_F) minimum]. For over 75 ft.
(23 m), use no. 14 AWG insulated wire [35_C(95_F)
minimum]. All wire sizes larger than no. 18 AWG cannot
be directly connected to the thermostat and will require a
junction box and splice at the thermostat.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field--supplie d and field--installed liquidtight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconne ct (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24--v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
Units without Thru--Base Connections —
1. Install power wiring conduit through side pane l openings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 19.
Field Control Wiring —
The 50TC unit requires an external temperature control
device. This device can be a thermostat (field--supplied) or a
PremierLinkt controller (available as factory--installed
option or as field--installed accessory, for use on a Carrier
Comfort Network or as a stand alone control) or the RTU
Open Controller for Building Management Systems using
non--CCN protocols. The RTU Open controller is available
as a factory--installed option only.
Note 2: W2 connection not required on units with single-stage heating.
Field Wiring
(Note 2)
Terminal
X
C
G
W2
W1
Y2
Y1
R
T–STAT
Board
X
C
G
W2
W1
Y2
Y1
R
C09351
Fig. 25 -- Typical Low--Voltage Control Connections
Unit without Thru--Base Connection Kit —
Pass the thermostat control wires through the hole provided
in the end panel (see item “D” in the view labeled “LEFT”
in Fig. 2 and 3); then feed the wires through the raceway
built into the corner post to the control box. Pull the wires
over to the terminal strip on the upper--left corner of the
Central Terminal Board. (CTB) See Fig. 26.
18
RACEWAY
DISCONNECT MOUNTING
LOCATION
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 26 -- Field Control Wiring Raceway
NOTE:If thru-- the--bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second-- stage heating, when available.
Electric Heaters
50TC units may be e quipped with field--installed
accessory electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, limit switches
and a control contactor. One or two heater modules m ay
be used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 27 -- 29.
Not all available heater modules may be used in every
unit. Use only those heater modules that are UL listed for
use in a specific size unit. Refer to the label on the unit
cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marke d with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).
Bare Heater
Carton and packing materials
Installation sheet
CRHEATER101A00
19
Single Point Boxes and Supplementary Fuses —
When the unit MOCP device value exceeds 60--A,
unit--mounted supplementary fuses are required for each
heater circuit. These fuses are included in accessory
Single Point Boxes, with power distribution and fuse
blocks. The single point box will be installed directly
under the unit control box, just to the left of the partition
separating the indoor section (with electric heaters) from
the outdoor section. The Single Point Box has a hinge d
access cover. See Fig. 30. The Single Point Box also
includes a set of power taps and pigtails to complete the
wiring between the Single Point Box and the unit’s main
control box terminals. Refer to the accessory heater and
Single Point Box installation instructions for details on tap
connections.
All fuses on 50TC units are 60-- A. (Note that all heaters
are qualified for use with a 60--A fuse, regardless of actual
heater ampacity, so only 60--A fuses are necessary.)
Single Point Boxes without Fuses —
50TC
Unit heater applications not requiring supplemental fuses
require a special Single Point Box without any fuses. The
accessory Single Point Boxes contain a set of power taps
and pigtails to complete the wiring between the Single
Point Box and the unit’s main control box terminals. Refer
to accessory heater and Single Point Box installation
instructions for details on tap connections.
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAY S
HEATER
MOUNTING
SCREWS
2
1
1
1
2
1
3
3
A
L
LIE
D
P
A
CO
RP.
MO
DE
L
NO
.
O
D
ER
I
A
L
N
O.
2
2
.
2
ISTED
AI
R
NDITIONIN
1
G
2
3
UI
P
ACCES
S
346
N
.
3
P
/
N
2
5
6
1
RE
0
V
4
Fig. 30 -- Typical Single Point Installation
C14253
CTB
CONTL
BOARD
2
3
12
Field
TB4
VIO
ORN
BRN
BRN
BRN
BRN
ORN
13
VIO
VIO
2
VIO
Connections
Elec Htr
HR2
HR1
BRN
BRN
VIO
VIO
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
C08331
Fig. 31 -- Accessory Electric Heater Control
Connections (Except CRHEATER128B00-- 129B00)
For CRHEATER128B00--129B00 only
— Connect t he
ORN lead from Heater Relay 1 (HR1) to terminal TB4--1.
For 2 stage heating connect the VIO lead from Heater
Relay 3 (HR3) to terminal TB4--2. For 1 stage heating
with CRHEATER128B00 or CRHEATER129B00 connect
the ORN lead from HR1 and the VIO lead from HR3 to
terminal TB4--1. Connect the BRN lead from HR1 to
TB4--3. See Fig. 32.
CTB
CONTL
BOARD
2
3
12
VIO
ORN
BRN
Low--Vol tage Control Connections —
Pull the low--voltage control leads from the heater
module(s) -- VIO and BRN (two of each if two modules
are installed; identify for Module #1) -- to the 4--pole
terminal board TB4 located on the heater bulkhead to the
left of Heater #1. Connect the VIO lead from Heater #1 to
terminal TB4--1. Except for CRHEATER128B00--129B00,
for 2 stage heating, connect the VIO lead from Heater #2
to terminal TB4--2. For 1 stage heating with 2 heater
modules connect the VIO lead from bot h Heater #1 and #2
to terminal TB4--1. Connect both BRN leads to terminal
TB4--3. See Fig. 31.
ORNVIOBRN
TB4
2
ORN
31
BRNVIO
Field
Connections
Elec Htr
VIO
HR3
LS
ORNBRN
For simplicity, not all control
wiring internal to the electric
heaters is shown.
LS: Primary Limit Switch
HR1
Fig. 32 -- Accessory Electric Heater Control
Connections for CRHEATER128B00--129B00 Only
20
a50--- 9606
Humidi-- MiZerRSystem Control Connections —
Humidi--MiZer System –Space RH Controller —
The Humidi--MiZer dehumidification system requires a
field--supplied and installed space relative humidity
control device. This device may be a separate humidistat
control (contact closes on rise in space RH above control
setpoint) or a combination thermostat--humidistat control
device such as Carrier’s Edge
isolated contact set for dehumidification control. The
humidistat is normally used in applications where a
temperature control is already provided (units with
PermierLinkt control).
To connect the Carrier humidistat (HL38MG029):
1. Route the humidistat 2--conductor cable (field--supplied) through the hole provided in the unit corner
post.
2. Feed wires through the raceway build into the corner
post (see Fig. 26) to the 24--v barrier located on the
left side of the control box. The raceway provides the
UL--required clearance between high--voltage and
low--voltage wiring.
3. Use wire nuts to connect humidistat cable to two
PINK leads in the low–voltage wiring as shown in
Fig. 35.
To connect the Thermidistat device (33CS2PPRH--01):
1. Route the Thermidistat multi--conductor thermostat
cable (field--supplied) through the hole provided in
the unit corner post.
2. Feed wires through the raceway build into the corner
post (see Fig. 26) to the 24--v barrier located on the
left side of the control box. The raceway provides the
UL--required clearance between high--voltage and
low--voltage wiring.
3. The Thermidistat has dry contacts at terminals D1
and D2 for dehumidification operation (see Fig. 36).
The dry contacts must be wired between CTB
terminal R and the PINK lead to the LTLO switch
with field--supplied wire nuts. Refer to the installation
instructionsincludedwiththeCarrierEdge
Thermidistat device for more information.
R
Pro Thermidistat with
% RELATIVE HUMIDITY
C09295
Fig. 33 -- Accessory Field--Installed Humidistat
®
C09296
Fig. 34 -- EDGE Pro Thermidistat
EconoMi$er
R
X (Factory--Installed Option) —
For details on operating 50TC units equipped with the
factory--installedEconoMi$erXoption,referto
Factory--InstalledEconomizersforTC/TCQ/HC/HCQ/
LC/KC/KCQ Rooftop Units, 3 to 27.5 Nominal Tons.
Economizer Supplement Related to California Title 24.
50TC
21
50TC
C150008
Fig. 35 -- Typical Humidi--MiZer Adaptive Dehumidification System Humidistat Wiring
EDGE Pro THERMIDISTAT
Rc
Rh
W1
G
Y2
C
O/W2/B
Y1
Unit CTB
THERMOSTAT
X*
C
G
W2
W1
Y2
Y1
OAT
R
RRS
SRTN
HUM
Humidi-MiZer™ FIOP
D1
D2
V+
Vg
*Connection not required.
Fig. 36 -- Typical Rooftop Unit with Humidi--MiZer Adaptive Dehumidification System
with Edge Pro Thermidistat Device
22
C09298
PremierLinkt (Factory--Installed Option) —
50TC
Fig. 37 -- PremierLink Controller
The PremierLink controller (see Fig. 37) is compatible
with Carrier Comfort Networkr (CCN) devices. This
control is designed to allow users the access and ability to
change fac tory--defined setti ngs, thus expanding the
function of the standard unit control board. CCN service
access tools include System Pilott, Touch Pilott and
Service Tool. (Standard tier display tools Navigatort and
Scrolling Marquee are not suitable for use with latest
PremierLink controller (Version 2.x).)
The PremierLink controller is factory--mounted in the
50TC unit’s main control box to the left of the Central
Terminal Board (CTB). Factory wiring is completed
through harnesses connected to the CTB thermostat. Field
connections are made at a 16--pole terminal block (TB1)
located on the bottom shelf of the unit control box in front
C08199
of the PremierLink controller. The factory--installed
PremierLink controller includes the supply--air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$er
R
2 package.
The PremierLink controller requires the use of a Ca rrier
electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is
necessary for broadcast of time of day functions
(occupied/unoccupied).
NOTE:PremierLink controller is shipped in Sensor
mode. To be used with a thermostat, the PremierLink
controller must be configured to Thermostat mode. Refer
to PremierLink Configuration instructions for Operating
Mode.
Fig. 40 -- PremierLink Controller Wiring Schematic with Humidi--MiZerRSystem
25
C150011
Supply Air Temperature (SAT) Sensor —
On FIOP--equipped 50TC unit, the unit is supplied with a
supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6--inches (152
mm) in length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied to
the supply--air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re--position the sensor in the flange of the supply--a ir
opening or in the supply air duct (as required by local
1
codes). Drill or punch a
/2--in. hole in the fla nge or duct.
Use two field--supplied, self--drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 41.
50TC
NOTE:The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit’s heater surfaces.
Outdoor Air Temperature (OAT) Sensor —
R
The OAT is factory--mounted in the EconoMi$er
2(FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
EconoMi$er2 —
The PremierLink controller is used wit h E conoMi$er2
(option or accessory) for outdoor air management. The
damper position is controlled directly by the PremierLink
controller; the Ec onoMi$er2 unit has no internal logic
device.
Outdoor air management functions can be enhanced with
field--installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO
Outdoor air CO
sensor
2
sensor
2
Refer to Table 3 for accessory part numbers.
SUPPLY AIR
TEMPERATURE
SENSOR
SUPPLY AIR
RETURN AIR
ROOF
CURB
Field Connections
Field connections for accessory sensor and input devices
are made at the 16--pole terminal block (TB1) located on
the control box bottom shelf in front of the PremierLink
control (See Fig. 39 and 40). Some input de vices also
C08200
Fig. 41 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
require a 24--vac signal source; connect at CTB terminal
R at “THERMOSTAT” connection strip for this signal
source. See connections figures on following pages for
field connection locations (and for continued connections
NOTE: Refer to the PremierLinkt Controller Ins tallatio n,
at the PremierLink board inputs).
Start--up, and Configuration Instructions for complete
PremierLinkconfiguration,operatingsequencesand
troubleshooting information. Have a copy of this manual
available at unit start--up.
Table 4 provides a summary of field connections for units
equipped with Space Sensor. Table 5 provides a summary of
field connections for units equipped with Space Thermostat.
Table 3 – PremierLink Sensor Usage
OUTDOOR AIR
APPLICATION
Differential Dry Bulb
Tem p er a tu r e wit h
PremierLink
(PremierLink requires
4 --- 2 0 m A A c t u a t o r )
Single Enthalpy with
PremierLink
(PremierLink requires
4 --- 2 0 m A Ac t u a t o r )
Differential Enthalpy
with PremierLink
(PremierLink requires
4 --- 2 0 m A Ac t u a t o r )
NOTES:
Sensors (Optional):
CO
2
33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 --- Aspirator box used for duct---mounted CO
33ZCT55CO2 --- Space temperature and CO
33ZCT56CO2 --- Space temperature and CO
TEMPERATURE
SENSOR
I n c l u d e d ---
CRTEMPSN001A00
I n c l u d e d ---
Not Used
I n c l u d e d ---
Not Used
room sensor with override.
2
room sensor with override and setpoint.
2
RETURN AIR
TEMPERATURE
SENSOR
R e q u i r e d --33ZCT55SPT
or equivalent
---
---
room sensor.
2
26
OUTDOOR AIR
ENTHALPY SENSOR
------
R e q u i r e s ---
33CSENTHSW
R e q u i r e s ---
33CSENTHSW
RETURN AIR
ENTHALPY SENSOR
---
R e q u i r e s ---
33CSENTSEN
Table 4 – Space Sensor Mode
TB1 TERMINALFIELD CONNECTIONINPUT SIGNAL
1T 5 5 --- S E N / T 5 6 --- S E NAnalog (10k thermistor)
2RMTOCCDiscrete, 24VAC
3T 5 5 --- S E N / T 5 6 --- S E NAnalog (10k thermistor)
4CMPSAFEDiscrete, 24VAC
5T56 --- SETAnalog (10k thermistor)
6FSDDiscrete, 24VAC
7LOOP---PWRAnalog, 24VDC
8SPSDiscrete, 24VAC
9IAQ --- SENA n a l o g , 4 --- 2 0 m A
10FILTERDiscrete, 24VAC
11I A Q --- C O M / O A Q --- C O M / R H --- C O MA n a l o g , 4 --- 2 0 m A
12CCN + (RED)Digital,,5VDC
13OAQ--- SEN/RH--- SENAn a l o g , 4 --- 2 0 m A
14CCN Gnd (WHT)Digital, 5VDC
15AUX OUT(Power Exhaust)(Output)Discrete 24VAC
16CCN --- (BLK)Digital, 5VDC
LEGEND:
T 5 5--- S p a c e Te m p e r a t u r e Se n s o rF S D --- F i r e Sh u t d o w n
T 5 6--- S p a c e Te m p e r a t u r e Se n s o rI A Q --- I n d o o r Ai r Q u a l i t y ( C O
CCN--- Carrier Comfort Network (communication bus)OAQ --- Outdoor Air Quality (CO
C M P S A F E--- C o m p r e s s o r S a f e t yR H --- R e l a t i v e H u m i d i t y
F I LT E R--- D i r t y F i l t e r S w i t c hS F S --- S u p p l y F a n St a t u s
50TC
)
2
)
2
Table 5 – Thermostat Mode
TB1 TERMINALFIELD CONNECTIONINPUT SIGNAL
1RAT SENAnalog (10k thermistor)
2GDiscrete, 24VAC
3RAT SENAnalog (10k thermistor)
4Y1Discrete, 24VAC
5——
6Y2Discrete, 24VAC
7LOOP--- PWRAnalog, 24VDC
8W1Discrete, 24VAC
9I A Q --- S E NAnalog, 4 --- 20mA
10W2Discrete, 24VAC
11I A Q --- C O M / O A Q --- C O M / R H --- C O MAnalog, 4 --- 20mA
12CCN + (RED)Digital, 5VDC
13O A Q --- S E N / R H --- S E NAnalog, 4 --- 20mA
The PremierLinkt controller is factory--shipped configured
for Space Sensor Mode. A Carrier T--55 or T--56 space
sensor must be used. T--55 space temperature sensor
provides a signal of space temperature to the PremierLink
controller. T--56 provides same space temperature signal plus
it allows for adjustment of space temperature setpoints from
the face of the sensor by the occupants.
TB1PL
SENJ6-7
SEN
Jumper
SET
SET
1
TB1
3
5
Fig. 45 -- PremierLink Controller T--56 Sensor
Connect Thermostat —
PL
J6-6
J6-5
C08213
2
SW1
3
45
SEN
61
RED(+)
WHT(GND)
BLK(-)
BRN (GND)
BLU (SPT)
CCN COM
SENSOR WIRING
50TC
Fig. 42 -- T--55 Space Temperature Sensor Wiring
Connect T--55: See Fig. 42 for typical T-- 55 i nternal
connections. Connect the T--55 SEN t erminals to TB1
terminals 1 and 3 (see Fig. 43).
TB1PL
SENJ6-7
SEN
1
3
Fig. 43 -- PremierLink Controller T--55 Sensor
Connect T--56: See Fig. 44 for T--56 i nternal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T--56 terminals to TB1 terminals 1, 3
and 5 (see Fig. 45).
2
SW1
3
45
SEN
61
RED(+)
WHT(GND)
BLK(-)
SET
BRN (GND)
BLU (SPT)
BLK
(T56)
CCN COM
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
J6-6
C08201
C08212
A 7--wire thermostat connection requires a 24--v power
source and a common connection. Use the R and C
terminals on the CTB’s THERMOSTAT connection strip
for these. Connect the thermostat’s Y1, Y2, W1, W2 and
G terminals to the PremierLink controller at TB1 as
shown in Fig. 46.
If the 50TC unit is equipped with factory--installed smoke
detector(s), disconnect the factory BLU lead at TB1--6
(Y2) before conne cting the thermostat. Identify the BLU
lead originating at CTB--DDC--1; disconnect at TB1--6
and tape off. Confirm that the second BLU lead at TB1--6
remains connected to the PremierLink controller at J4--8.
SPACE
THERMOSTAT
R
GJ4-12
Y1
Y2
W1
W2
C
CTB
THERMOSTAT
R
TB1
2
4
6
8
10
CTB
C
THERMOSTAT
PL
J4-10
J4-8
J4-6
J4-4
C08119
Fig. 46 -- Space Thermostat Connections
If the 50TC unit has an economizer system and
free--cooling operation is required, a sensor representing
Return AirTemperaturemustalso beconnected
(field--supplied and installed). This sensor may be a T--55
Space Sensor (see Fig. 42) installed in the space or in the
return duct, or it may be sensor PNO 33ZCSENSAT,
installed in the return duct. Connect this sensor to TB1--1
and TB1--3 per Fig. 43.
Configure the Unit for Thermostat Mode —
Connect to the CCN bus using a CCN service tool and
navigate to PremierLink Configuration screen for Operating
Mode. Default setting is Sensor Mode (value 1). Change the
value to 0 to reconfigure the controller for Thermostat Mode.
CoolWarm
Fig. 44 -- T--56 Internal Connections
C08202
When the PremierLink controller is configured for
Thermostat Mode, these functions are not available: Fire
Shutdown(FSD),RemoteOccupied(RMTOCC),
Compressor Safety (CMPSAFE), Supply Fan Status
(SFS), and Filter Pressure Switch (FILTER).
28
Economizer Controls
Indoor Air Quality (CO2)Sensor—
The indoor air quality sensor accessory monitors space
carbon dioxide (CO
monitor IAQ levels. Several types of sensors are available,
for wall mounting in the space or in return duct, with and
without LCD display, and in combination with space
temperature sensors. Sensors use infrared technology to
measure the levels of CO
The CO
sensors are all factory set for a range of 0 to
2
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO
requirements and terminal locations. See Fig. 47 for
typical CO
sensor wiring schematic.
2
) levels. This information is used to
2
present in the space air.
2
sensor for electrical
2
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 47. Connect the 4--20 mA terminal to
terminal TB1--9 and connect the SIG COM terminal to
terminal TB1--11. See Fig. 48.
IAQ Sensor
SENJ5-5
COM
24 VAC
TB1
9
TB1
7
PL
J5-6
C08636
Fig. 48 -- Indoor CO2Sensor (33ZCSENCO2)
Connections
Refer to the PremierLinkt Installation, Start--up, and
Configuration Instructions, for detailed configuration
information.
+
0-10VDC
-
SIG COM
+
4-20mA
ALARM
NC
COM
RELAY
}
CONTACTS
NO
24 VAC
HG
OR
+
-
24 VDC
2
1
J3J4
5
1
4
32
7
6
8
C08635
Fig. 47 -- Indoor/Outdoor Air Quality (CO2)Sensor
(33ZCSENCO2) -- Typical Wiring Diagram
To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return--air
grille (if present) so it senses the concentration of CO
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor: For each sensor,
use two 2--conductor 18 AWG (American Wire Gage)
twisted-- pair cables (unshielded) to connect the separate
isolated 24 vac power source to the sensor and to connect
the sensor to the control board terminals.
Outdoor Air Quality Sensor
(PNO 33ZCSENCO2 plus weatherproof enclosure) —
The outdoor air CO
dioxide (CO
) levels in the outside ventilation air and
2
sensor is designed to monitor carbon
2
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 49. The outdoor air CO
sensor must be located in the
2
economizer outside air hood.
2
COVER REMOVEDSIDE VIEW
Fig. 49 -- Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
Sensor: A dedicated
2
power supply is required for this sensor. A two--wire cable
is required to wire the dedicated power supply for the
sensor. The two wires should be connected to the power
supply and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 47. Connect the 4 to 20 mA
terminal to the TB1--13 terminal of the 50TC. Connect the
SIG COM terminal to the TB1--11 terminal of the 50TC.
See Fig. 50.
50TC
C07135
29
OAQ Sensor/RH Sensor
SENJ5-2
COM
24 VAC
TB1
13
TB1
11
Fig. 50 -- Outdoor CO2Sensor Connections
Space Relative Humidity Sensor or Humidistat
Connections —
SpaceRelativeHumidity Sensorconnections: The
accessory space relative humidity sensor (33ZCSEN S R H -0 2)
is installed on an interior wall to measure the relative
humidity of the air within the occupied space.
The use of a standard 2 X 4 inch electrical box to
accommodate the wiring is recommended for installation.
The sensor can be mounted directly on the wall, if
acceptable by local codes.
50TC
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
permanent damage to the sensor.
DO NOT clean or touch the sensing element with
chemical solvents as they can permanently damage the
sensor.
!
CAUTION
UNIT PERFORMANCE HAZARD
Failure to follow this caution will result in inaccurate
sensor rea dings.
DO NOT mount the sensor in drafty areas such as near
heating or air--conditioning ducts, open windows, fans,
or over heat sources such as bas ebo ard heaters,
radiators, or wall--mounted dimmers. Sensors mounted
in those areas will produce inaccurate readings.
If the sensor is installed directly on a wall service, install the
humidity sensor using 2 screws and 2 hollow wall anchors
(field--supplied). Do not over tighten screws. See Fig. 51.
MOUNTING
HOLES
Io
Gnd
Vin
Vo
WIRING
OPENING
PL
J5-3
C08275
The sensor must be mounted vertically on the wall. The
Carrier logo should be orie ntated correctly when the
sensor is properly mounted.
Avoid corner locations. Allow at least 4 ft between the
sensor and any corner. Airflow near corners tends to be
reduced, resulting in erratic sensor readings. The sensor
should be vertically mounted approximately 5 ft up from
the floor, beside the space temperature sensor.
For wiring distances up to 500 feet, use a 3--conductor, 18
or 20 AWG cable. A CCN communication cable can be
used, although the shield is not required. The shield must
be removed from the sensor end of the cable if this cable
is used. See Fig. 52 for wiring details.
TB1-7
TB1-13
RED
BLACK
IoVoVin Gnd
C11180
Fig. 52 -- Space Relative Humidity Sensor Connection
The power for the sensor is provided by the PremierLinkt
controller on terminal J5--4 (+33 to +35vdc).
To wire the sensor:
1. At the sensor, remove 4 inches fo the jacket from the
cable. Strip ¼ inch of insulation from each conductor.
Route the cable through the wire clearance opening in
the center of the sensor. See Fig. 51.
2. Connect a field--supplied BLACK wire to the sensor
screw terminal marked Vin.
3. Connect a field --supplied RED wire into the sensor
screw terminal marked Io.
4. Connect the field--supplied RED wire from the sensor
to TB1--13.
5. Connect the field--supplied BLACK wire from the
sensor to TB1--7.
Smoke Detector/Fire Shutdown (FSD) —
This function is available only when the PremierLink
controller is configured for (Space) Sensor Mode. The unit
is factory--wired for PremierLink FSD operation when the
PremierLink controller is factory-- installed.
SW2
123456
ON
C11084
Fig. 51 -- Space Relative Humidity Sensor Installation
On 50TC units equipped with factory--installed Smoke
Detector(s), the smoke detector controller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The PremierLink
controller communicates the smoke detector’s tripped
status to the CCN building control. See Fig. 39 and 40, the
PremierLink controller wiring schematics.
30
Filter Status Switch —
Remote Occupied Switch —
This functi on is available only when the PremierLinkt
controller is configured for (Space) Sensor Mode.
PremierLink controller can monitor return filter status in
two ways: By monitoring a field--supplied/installed filter
pressure switch or via supply fan runtime hours.
Using switch input: Install the dirty filter pressure switch
according to switch manufacturer’s instructions, to
measure pressure drop across the unit’s return filters.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT--R terminal. Connect the other side of the
NO contact set to TB1--10. Setpoint for Dirty Filter is set
at the switch. See Fig. 53.
Filter Switch (NO, close on rising pressure (high drop))
CTB
Thermostat
R
TB1
10
PL
J4-4
C08216
Fig. 53 -- PremierLink Controller Filter Switch
Connection
When the filter switch’s NO contact set closes as filter
pressure drop increases (indicating dirt--laden filters), the
input signal to the PremierLink controller causes the filter
status point to read “DIRTY”.
The PremierLink controller permits a remote timeclock to
override the control’s on--board occupancy schedule and
place the unit into Occupied mode. This function may also
provide a “Door Switch” time delay function that will
terminate cooling and heating functions after a 2--20
minute delay.
Connect one side of the NO contact set on the timeclock
to CTB’s THERMOSTAT --R terminal. Connect the other
side of the timeclock contact to the unit’s TB1--2 terminal
(see Fig. 55).
Remote Occupied
Time Clock
CTB
Thermostat
R
TB1
2
PL
J4-12
C08214
Fig. 55 -- PremierLink Controller Wiring Remote
Occupied
Refer to the PremierLink Controller Installation, Start--up,
and ConfigurationInstructions forinstructionsfor
additional information on configuring the PremierLink
control for Door Switch timer function.
Power Exhaust (output) —
Connect the accessory Power Exhaust contactor coils(s)
per Fig. 56.
50TC
Using Filter Timer Hours: Refer to the PremierLink
ControllerInstallation,Start--up,andConfiguration
Instructions for instructions on using the Premi erLink
Configuration screens and on unit alarm sequence.
Supply Fan Status Switch —
The PremierLink controller can monitor supply fan
operation through a field--supplied/installed differential
pressure switch. This sequence will prevent (or interrupt)
operation of unit cooling, heating and economizer
functions until the pressure switch contacts are closed
indicating proper supply fan operation.
Install t he differential pressure switch in the supply fan
section according to switch manufacturer’s instructions.
Arrange the switch contact to be open on no flow and to
close as pressure rises indicating fan operation.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT--R terminal. Connect the other side of the
NO contact set to TB1--8. Setpoint for Supply Fan Status
is set at the switch. See Fig. 54.
Fan (Pressure) Switch (NO, close on rise in pressure)
CTB
Thermostat
R
TB1
8
PL
J4-6
C08118
Fig. 54 -- PremierLink Contr o ller Wiring Fan Pressur e
Switch Connection
Power Exhaust
PEC
TAN
TB1
15
PL
J8-3
CTB
THERMOSTAT
GRA
C
C08120
Fig. 56 -- PremierLink Power Exhaust Output
Connection
NOTE: The Power Exhaust and Humidi--MiZer
R
system
options can not be used with PremierLink controller at the
same time as both options require connection at TB1--15
(AUX OUT).
CCN Communication Bus —
The PremierLink controller connects to the bus in a daisy
chain arrangement. Negative pins on each component must
be connected to respective negative pins, and likewise,
positive pins on each component must be connected to
respective positive pins. The controller signal pins must be
wired to the signal ground pins. Wiring connections for CCN
must be made at the 3--pin plug.
At any baud (9600, 19200, 38400 baud), the number of
controllers is limited to 239 devices maximum. Bus length
may not exceed 4000 ft, with no more than 60 total
devices on any 1000--ft section. Optically isolated RS--485
repeaters are required every 1000 ft.
NOTE: Carrier device default is 9600 band.
31
Communications Bus Wire Specifications: The CCN
CommunicationBuswiringisfield--suppliedand
field--i nstalled. It consists of shielded 3--conductor c able
with drain (ground) wire. The cable selected must be
identical to the CCN Communication Bus wire used for
the entire network.
See Table 6 for recommended cable.
Table 6 – Recommended Cables
MANUFACTURERCABLE PART NO.
Alpha2413 or 5463
AmericanA22503
Belden8772
Columbia02525
NOTE: Conductors and drain wire must be at least 20
AWG, stranded, and tinned copper. Individual conductors
must be insulated with PVC, PVC/nylon, vinyl, Teflon*,
50TC
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
-- 2 0 _Cto60_C is required. Do not run communica tion
wire in the same conduit as or next to any AC voltage
wiring.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must
be connected to ground at only one single point. If the
communication bus cable exits from one building and
enters another building, the shields must be connected to
the grounds at a lightning suppressor in each building (one
point only).
Connecting CCN bus:
NOTE: When connecting the c ommunication bus cable,
a color c odesystemfortheentirenetwork is
recommended to simplify installation and checkout. See
Table 7 for the recommended color code.
Table 7 – Color Code Recommendations
SIGNAL TYPE
+Red1
GroundWhite2
---Black3
CCN BUS WIRE
COLOR
CCN PLUG PIN
NUMBER
Connect the CCN (+) lead (typically RED) to the unit’s
TB1--12 terminal. Connect the CCN (ground) lead
(typically WHT) to the unit’s TB1--14 terminal. Connect
the CCN (--) lead (typically BLK) to the unit’s TB1--16
terminal. See Fig. 57.
CCN Bus
+ (RED)
GND (WHT)
– (BLK)
TB1
12
TB1
14
TB1
16
PL
J2-1
J2-2
J2-3
C08276
Fig. 57 -- PremierLinkt Controller CCN Bus
Connections
* Teflon is a registered trademark of DuPont.
32
RTU Open Controller System
The RTU Opencontroller is factory--mounted in the
50TC unit’s main control box, t o the left of the CTB. See
Fig. 59 or 60. Factory wiring is completed through
harnesses connected to the CTB. Field--connections for
RTU Open controller sensors will be made at the Phoenix
connectors on the RTU Open board. The factory--installed
RTU Open controller includes the supply--air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$er
R
2 package.
The RTU Open controller is an integrated component of
theCarrierrooftopunit.Itsinternalapplication
Input_2 (CO2/RH)
Input_1 (CO2/RH)
+24 VDC
Gnd
Gnd
+24 VDC
Board Power
24 VAC IN
J4
BO-2 (W2)
BO-1 (G)
Gnd
Input_3 (X)
programming provides optimum performance and energy
efficiency. The RTU Open controller enables the unit to
run in 100% stand--alone control mode, Carrier’s i--Vu
Open network, or a Third Party Building Automation
System (BAS). On--board DIP switches allow you to
select your protocol (and baud rate) of choice among t he
four most popular protocols in use today: BACnet*,
Modbus
{
, Johnson N2 and LonWorks**. (See Fig. 58.)
Refer to Table 8, RTU Open Controller Inputs and Outputs
for locations of a ll connections to the RTU Open board.
NOTE: The RTU Open controller acts as an intelligent
imbedded thermostat. A room thermostat cannot be used
with the RTU Open controller.
Input _8 (Enthalpy)
Input_5 (SMK)
Input_4 (R)
BO-5 (Y1)
BO-4 (Y2)
BO-3 (W1)
(SAT)
Gnd
(OAT)
Gnd
AO-1 (ECON)
24 VAC
0-10VDC
(AO-1)
Configurable - Input_5
Configurable - Input_3
Input_9 (Humidistat)
24 VAC
24 VAC
24 VAC
Configurable - Input_8
24 VAC
J3
J2J1
4-20mA
R
50TC
3-Volt
Lithium
Battery
LonWorks
Option Card
Port
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Recommended for all
i-Vu Open installations
J15
J5J5
BO-1BO-2BO-3BO-4BO-5
J22
AO-2
GND
(2-10V)
J13
BO-6
BO-7
BO-8
J12
J17
Network Comm
J20
Protocol SelectorSPT (temp input)BACnet, Modbus, or N2
*Remove
both for 0-5V
SPT (common)
SPT (offset input)
J19
(LON connection J15)
Fig. 58 -- RTU Open Multi --Protocol Controller Board
J14
J22
VFD Output
J11
BO-6
(H) Humidimizer
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
(Power Exhaust)
C14129
* BACnet is a registered trademark of ASHRAE (American Society of
Heating, Refrigerating and Air --- Conditioning Engineers).
{
Modbus is a registered trademark of Schneider Electric.
** LonWorks is a registered trademark of Echelon Corporation.
33
50TC
Fig. 59 -- RTU Open Controller System Wiring Diagram
34
C150012
50TC
Fig. 60 -- RTU Open Controller System Wiring Diagram with Humidi--MiZerRSystem
35
C150013
Table 8 – RTU Open Controller Inputs and Outputs
POINT NAME
Space Temp / Zone Tempzone_tempAI (10K Thermistor)J2 0 --- 1 a n d 2Analog Input 10
Supply Air Tempe raturesa_tempAI (10K Thermistor)J 2 --- 1 a nd 2Analog Input 6
Outside Air Temperatureoa_tempAI (10K Thermistor)J 2 --- 3 a n d 4Analog Input 7
Space Temperature Of fset Potstpt_adj_offsetAI (100K Potentiometer)J 2 0 --- 3 a n d 4Analog Input 11
AI---A n a l o g I n p u t
AO --- A n a l o g O u t p u t
BI--- B i n a r y I n p u t
BO --- Binary Output
(1)
Safety Chain Feedback: 24Vac required at this terminal to provide “Run Enable” status. See Input/Output section for additional instructions.
(2)
These inputs are configurabl e. If installed, they take the place of the default input on the specific cha nnel. Se e appro priate Input Configuratio n Section for wiring and setup instructions.
(3)
P a r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u s e d f o r f i e l d i n s t a l l a t i o n .
(4)
Refer to the input configuration and accessory sections of the RTU Open Mult i --- Protocol Controller Controls, Start ---Up, Operation and Troubleshooti ng manual for more detail.
The RTU Open cont roller requires the use of a Carrier
space sensor. A standard thermostat cannot be used with
the RTU Open system.
Supply Air Temperature (SAT) Sensor —
On FIOP--equipped 50TC unit, the unit is supplied with a
supply--air temperature (SA T) sensor (33ZCSENSAT). This
sensor is a tubular probe type, approx 6--inches (152 mm) in
length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied to
the supply--air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re--position the sensor in the flange of the supply--a ir
opening or in the supply air duct (as required by local
1
codes). Drill or punch a
/2--in. hole in the fla nge or duct.
Use two field--supplied, self--drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 41.
Outdoor Air Temperature (OAT) Sensor —
R
The OAT is factory--mounted in the EconoMi$er
2(FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
EconoMi$er2 —
The RTU Open controller is used with EconoMi$er2
(factory-- installed option or field--installed accessory) for
outdoor air management. Thedamper position is
controlled directly by the RTU Open controller; the
EconoMi$er2 unit has no inte rnal logic device.
Outdoor air management functions can be enhanced with
field--installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO
Outdoor air CO
sensor
2
sensor
2
36
Field Connections
Field connections for accessory sensors a nd input devices
are made the RTU Open controller, at plugs J1, J2, J4, J5,
J11 and J20. All field--control wiring that connects to the
RTU Open controller must be routed through the raceway
built into the corner post as shown in Fig. 26. The
raceway provides the UL required clearance between high
and low--voltage wiring. Pass the control wires through
the hole provided in the corner post, then feed the wires
thorough the raceway to the RTU Open controller.
Connect to the wires to the removable Phoenix connectors
and then reconnect the connectors to the board.
Space Temperature (SPT) Sensors —
There a re two types of SPT sensors avail able from Carrie r,
resistive input non-communicating (T55, T56, and T59)
and Rnet communicating (SPS, SPPL, SPP , and SPPF)
sensors. Each type has a variety of options consisting of:
timed override button, set point adjustment, a LCD
screen, and communication tie in. Space temperature can
be also be written to from a building network or zoning
system. However, it is still recommended that return air
duct sensor be installed to allow stand-alone operation for
back-up. Refer to the configuration section for details on
controller configurations associate d with space sensors.
S 33ZCT55SPT, space temperature sensor with override
button (T--55)
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment (T--56)
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment (T--59)
Use 20 gauge wire to conne ct the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three--conductor shielded ca ble for the sensor and setpoint
adjustmentconnections. Ifthe setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two--conductor, twisted pair cable may be used.
SENJ20-1
SEN
Jumper
SET
SET
J20-2
J20-3
C08461
Fig. 62 -- RTU Open Controller T--56 Sensor
Connections
Connect T--59: The T--59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 63
for internal connections at the T--59. Connect the SEN
terminal (BLU) to the RTU Open controller at J20--1.
Connect the COM terminal (BRN) to J20--2. Connect the
SET terminal (STO or BLK) to J20--3.
BLK (STO)
BRN (COM)
BLU (SPT)
ORSETSEN
OPB COM- PWR+
24 VAC
NOTE: Must use a separate isolated transformer.
J20-3
J20-2
J20-1
SENSOR
WIRING
POWER
WIRING
C10291
Fig. 63 -- Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
50TC
Connect T--55: See Fig. 42 for typical T-- 55 i nternal
connections. Connect the T--55 SEN terminals to RTU
Open c ontroller J20--1 and J20--2. See Fig. 61.
SEN
SEN
J20-1
J20-2
C08460
Fig. 61 -- RTU Open Controller T--55 Sensor
Connections
Connect T--56: See Fig. 44 for T--56 i nternal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T--56 terminals to RTU Open
controller at J20--1, J20-- 2 and J20--3 per Fig. 62.
Indoor Air Quality (CO
)Sensor—
2
The indoor air quality sensor accessory monitors space
carbon dioxide (CO
) levels. This information is used to
2
monitor IAQ levels. Several types of sensors are available,
for wall mounting in the space or in return duct, with and
without LCD display, and in combination with space
temperature sensors. Sensors use infrared technology to
measure the levels of CO
The CO
sensors are all factory set for a range of 0 to
2
present in the space air.
2
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO
sensor for electrical
2
requirements and terminal locations. See Fig. 47 for
typical CO
sensor wiring schematic.
2
To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return--air
grille (if present) so it senses the concentration of CO
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
37
2
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor: For each sensor,
use two 2--conductor 18 AWG (American Wire Gage)
twisted-- pair cables (unshielded) to connect the separate
isolated 24 vac power source to the sensor and to connect
the sensor to the control board terminals.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 47. Connect the 4--20 mA te rminal to the
RTU Open controller at J4--2 and connect the SIG COM
terminal to the RTU Open controller a t J4--3. See Fig. 64.
50TC
IAQ Sensor
SEN
COM
24 VAC
Fig. 64 -- RTU Open Controller / Indoor CO2Sensor
(33ZCSPTCO2--01 or 33ZCSPTCO2LCD--01)
Connections
Outdoor Air Quality Sensor
(P/N 33ZCSPTCO2--01 or 33ZCSPTCO2LCD--01
plus weatherproof enclosure —
The outdoor air CO
dioxide (CO
) levels in the outside ventilation air and
2
sensor is designed to monitor carbon
2
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 49. The outdoor air CO
sensor must be located in the
2
economizer outside air hood.
Wiring the Outdoor Air CO2Sensor: A dedicated
power supply is required for this sensor. A two--wire cable
is required to wire the dedicated power supply for the
sensor. The two wires should be connected to the power
supply and terminals 1 and 2.
J4-2
J4-3
C08462
Space Relative Humidity Sensor or Humidistat —
R
Humidi-- MiZer
System Control Wiring: In units
equipped with the Humidi--MiZer option there are two loose
wires loose in the control box (one PNK and one PNK/BLK)
used to control the dehumidification function of the unit.
These wires are meant to be tied to a space humidistat or
thermidistat on an electromechanical unit. On RTU Open
controller equipped units these wires must be connected to
J1 1--7 and 8 to allow the Open board to operate the
dehumidification function for the unit. Disconnect the J11
Phoenix style connector from the board and use the plug
screws to secure the wires as follows: secure the PNK/B LK
wires at pin 7 and the PNK wires at pin 8, and then
reconnect the plug to the board at J11.
Relative Humidity Sensors (Space or Duct Mounted):
The accessory space humidity sensor (33ZCSENSRH-02)
or duct humidi ty sensor (33ZCSENDRH-02) is used to
measure the relative humidity of air within the space or
return air duc t. The RH reading is used to control the
Humidi--MiZer option of the rooftop unit. For wiring
distances up to 500 ft (152 m), use a 3--conductor, 18 or
20 AWG shielded cable. The shie ld must be removed
from the sensor end of the cable and grounded at the unit
end. The current loop power for sensor is provided by the
RTU Open controller as 24vdc. Refer to the instructions
suppliedwiththeRHsensor fortheelectrical
requirements and terminal locations. RTU Open controller
configurations must be changed after adding an RH
sensor. See Fig. 66 and 67 for typical RH sensor wiring.
S J4--1 or J4--4 = 24vdc loop power
S J4--2 or J4--5 = 4--20mA signal input
NOTE: The factory default for dehumidification control
is normally open humidistat.
MOUNTING
HOLES
Io
Gnd
Vin
Vo
WIRING
OPENING
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 49. Connect the 4 to 20 mA
terminal to the RTU Open controller at J4--5. Connect the
SIG COM terminal to RTU Open J4--6. See Fig. 65.
OAQ Sensor
SEN
COM
24 VAC
J4-5
J4-6
C11086
Fig. 65 -- RTU Open Controller / Outdoor CO2Sensor
(33ZCSPTCO2--01 or 33ZCSPTCO2LCD--01)
Connections
SW2
123456
ON
Vin - J4-1 or J4-4 24Vdc
Io - J4-2 or J4-5 -20mA output
Fig. 66 -- Space Relative Humidity Sensor Typical Wiring
38
C11087
J4-1 or J4-4 + 24 VDC Supply Voltage
J4-2 or J4-5 (-)4 to 20 mA Current Loop Output
to RTU Open controller
4-20mAVAC
VDC
or
GND 0-5V
0-10V
SPAN
or
123456
ON
Relative Humidity Sensor
(Polarized Male Connector)
Humidistat: The accessory humidistat provides the RTU
Open controller insight to the relative humidity in the
space. The humidistat reads the RH level in the space and
compares it to its setpoint to operate a dry contact. The
humidistat is a dedicated input on the confi gurable input 9
and tells the RTU Open controller when the RH level is
HIGH or LOW. The normal condition for humidity is
LOW. A normally open humidistat is the factory default
control for the Humidi--MiZer
R
system option.
To wire in the field:
S J5--8 = 24 VAC source for dry contact
S J5--7 = Signal input
Smoke Detector/Fire Shutdown (FSD) —
On 50TC units equipped with factory--installed Smoke
Detector(s), the smoke detector controller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The RTU Open
controller communicates the smoke detector’s tripped
status to the BAS building control. See Fig. 59 and 60
(RTU Open Controller wiring schematics).
TheFireShutdownSwitchconfiguration,
MENU
ConfigInputsinput 5, identifies the normally
open status of this input when there is no fire alarm.
Connecting Discrete Inputs —
FilterStatus:Thefilterstatusaccessoryisa
field--installed accessory. This accessory detects plugged
filters. When installing this accessory, the unit must be
configuredforfilterstatusbysetting
MENU
ConfigInputsinput3,5,8,or9to Filter
Status and norm ally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 58 and Fig. 59 or 60 for wire terminations at J5.
C12756
Fan Status: The fan status accessory is a field--installed
accessory. This accessory det ects when the indoor fan is
blowing air. When installing this accessory, the unit must
beconfiguredforfanstatusbysetting
MENU
ConfigInputsinput3,5,8,or9to Fan
Status and norm ally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 58 and Fig. 59 or 60 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory is
a field--installed accessory. This accessory overrides the
unoccupied mode and puts the unit in occupied mode.
When installing this accessory, the unit must be
configuredforremoteoccupancybysetting
MENU
ConfigInputsinput3,5,8,or9to Remote
Occupancy and normally open (N/O) or normally closed
(N/C).
Also set MENU
Schedulesoccupancy sour ce to DI
on/off. Input 8 or 9 is recommended for ease of installation.
Refer to Fig. 58 and Fig. 59 for wire terminations at J5.
Power Exhaust (output): The relay used by the RTU
Open controller board to control power exhaust is a dry
contact which means it does not have 24vac. This 24vac
must be connected to the relay to allow it to operate the
power exhaust relay in the PE accessory. A 24vac source
must be provided to J11--2 on the RTU Open controller
board. This can be provided by the unit’s transformer from
various sources. T he “R” terminal on the unit’s low
voltage terminal board (LVTB) is a logical source. Refer
to Fig. 58 and Fig. 59 or 60 for wire terminations at J11.
50TC
39
Communication Wiring -- Protocols
The RTU Open controller can be set to communicate on
four different protocols: BACnet, Modbus, N2, and
General —
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller; just make the front end user different.
LonWorks. Switch 3 (SW3) on the board is used to set
protocol and baud rate. Switches 1 and 2 (SW1 and SW2)
are used to set the board’s network address. See Fig. 68
and 69 for protocol switch settings and address switches.
The third party connection to the RT U Open controlle r is
through plug J19. See Fig. 70 for wiring.
NOTE: Power must be cycled after changing the SW1--3
switch settings.
Refer to the RTU Open v3 Integration Guide for more
detailed information on protocols, third party wiring, and
networking.
SW3 Protocol Selection
PROTOCOLDS8DS7DS6DS5DS4DS3DS2DS1
BACnet MS/TP
50TC
(Master)
Modbus
(Slave)
N2
(Slave)
LonWorksUnusedONONOFFONOFFOFFON
UnusedOFFOFFOFFONOFFSelect Baud Select Baud
UnusedOFFOFFONONOFFSelect Baud Select Baud
UnusedOFFOFFOFFONONOFFOFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATEDS2DS1
9600OFFOFF
19,200ONOFF
38,400OFFON
76,800ONON
Fig. 68 -- RTU Open Controller SW3 Dip Switch Settings
C07166
C10815
Fig. 69 -- RTU Open Controller Address Switches
Fig. 70 -- Network Wiring
C10816
40
Local Access
Wall Mounted Equipment Toucht Interface
The Equipment Touch interface is a wall--mounted
interface used to connect to the RTU Open controller to
access the control information, read sensor values, and
maintenance. This is an accessory interface that does not
come with the RTU Open controller. Wire the Equipment
Touch interface to the RTU Open controller’s J13 local
access port. There are 2 password protected levels in the
display (User and Admin). See the Equipment Touch
Installation and Setup Guide for more information. See
Appendix A in the guide for navigation and screen
content.
Field Assistant
Field Assistant is a computer program included with the
purchase of the Tech Tool Kit (USB-TKIT). This is a field
Tech Tool to set-up, service, or download application
software to the RTU Open controller and includes a USB
Link Cable. The link cable connects a USB port to the J12
local access port. The Field Assistant’s menu structure is
similar and functions the same as i--Vu
R
controller. See
Fig. 71.
RTU Open Controller Troubleshooting —
Communication LEDs The LEDs indicate if the
controller is speaking to the devices on the network. The
LEDs should reflect communication traffic based on the
baud rate set. The higher the baud rate the more solid the
LEDs will appear. See Table 9.
Connect to
computer’s
USB port
Access
Port
P1P1
J12
P5P5
Connect to
the Local
USB Link Kit
Access port
Fig. 71 -- PC Running Field Assistant
LOCAL
ACCESS
-
CR2032
J15
+
COMM
on
MSB LSB
SW1 SW2
OPTION
SW3
PORT
J12
mA
UI-11
RTU Open Controller
*Therm
RNET
mA
UI-10
*Therm
J13
+12 DVC
RnetRnet+
GND
GND
50TC
GND
TXRX
J20
C14131
41
Table 9 – LEDs
The LE Ds on the RTU Open controller show the status of certain functions
If this LED is on...Status is...
PowerThe RTU Open controller has power
RxThe RTU Open controller is receiving data from the network segment
TxThe RTU Open controller is transmitting data over the network segment
BO#The binary output is active
The Run and Error LEDs indicate control module and network status
If Run LED shows...And Error LED shows...Status is...
2 flashes per secondOffNormal
2 flashes per second2 flashes, alternating with Run LEDFive minute auto--- restart delay after system error
2 flashes per second3flashes,thenoffControl module has just been formatted
2 flashes per second4 flashes, then pauseTwo or more devices on this network have the
same MSTP network address
2 flashes per secondOnExec halted after frequent system errors or
control programs halted
5 flashes per secondOnExec start --- up aborted, Boot is running
50TC
5 flashes per secondOffFirmware transfer in progress, Boot is running
7 flashes per second7 flashes per second, alternating
with Run LED
14 flashes per second14 flashes per second,
alternating with Run LED
OnOnFailure. Tr y the following solutions:
Ten second recovery period after brownout
Brownout
S Turn the RTU Open controller off, then on.
S Format the RTU Open controller.
S Download memory to the RTU Open controller.
S Replace the RTU Open controller.
NOTE: Refer to the RTU Open Multi--Protocol Controller
Controls, Start--Up, Operation and Troubleshooting manual
for complete configuration of RTU Open controller,
operating sequences and troubleshooting information. Refer
to the RTU Open v3 Integration Guide for details on
configuration and troubleshooting of connected networks.
Have a copy of these manuals available at unit start--up.
Outdoor Air Enthalpy Control
(PNO
The enthalpy control (33CSENTHSW) is available as a
field--installed access ory to be used with the EconoMi$er
damper system. The outdoor air enthalpy sensor is part of
the enthalp y control. (The separate field--installed accessory
return air enthalpy sensor (33CSENTSEN) is required for
differential enthalpy control. See Fig. 72.)
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 72. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
33CSENTHSW)
R
Enthalpy
Switch
24V
GND
LOW
RED
BLK
GRA
Factory Wiring Harness
PL6-1 (24-V)
PL6-4 (COM)
CTB ECON
7
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
C11160
Fi g. 72 -- Enthalpy Switch (33CSENTHSW) Connections
2
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing and
comparing the outside air and return air enthalpy
conditions. Install the outdoor air enthalpy control as
described above. Add and install a return air enthalpy
sensor.
42
Return Air Enthalpy Sensor —
Mount the return--air enthalpy sensor (33CSENTSEN) in
the return--air section of the economizer. The return air
sensoriswiredtotheenthal pycontroller
(33CSENTHSW). See Fig. 73.
Return Air
Smoke Detector
(as shipped)
– 4-20
Main
+ VDC
Out
Outside Air
Enthalpy Switch
+ 24-36
VDC In
– 4-20 Main
Out
24V
GND
LOW
RED
BLK
GRA
Return Air
Enthalpy
Sensor
PL6-1 (24-V)
PL6-4 (COM)
CTB ECON
7
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
C11161
Fig. 73 -- Outside and Return Air Enthalpy Sensor
Wiring
Smoke Detectors
Smoke detectors are available as factory--installed options on
50TC models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer or in
combination of Supply Air and Return Air. All components
necessary for operation are factory--provided and mounted.
The unit is factory--configured for immediate smoke detector
shutdown operation; additional wiring or modifications to
unit terminal board may be necessary to complete the unit
andsmokedetectorconfigurationtomeetproject
requirements.
Units equipped with factory--optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 74 for the as shipped location.
50TC
C12282
Fig. 74 -- Return Air Smoke Detector, Shipping Position
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 75, Step 1. Save
the screws.
2. Turn the assembly 90 degrees and then rotate end to
end. Make sure that the elbow fitting is pointing
down. See Fig. 75, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 75, Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Additional Application Data —
Refer to the Application Data sheet titled Factory
Installed Smoke Detectors for Small and Medium Rooftop
Units2to25Tonsfor discussions on additional control
features of these smoke detectors including multiple unit
coordination.
Step 1Step 2Step 3
Fig. 75 -- Completing Installation of Return Air Smoke Sensor
43
C12283
48HC50TC
DISC. SIZE
MAX
BRKR
HACR
FUSE or
MCA
DISC. SIZE
MAX
BRKR
HACR
FUSE or
MCA
DISC. SIZE
Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data with Single Speed Indoor Fan Motor
MAX
BRKR
HACR
FUSE or
MCA
DISC. SIZE
FLALRAFLALRAFLALRAFLALRA
NO P.E.w/ P.E. (pwrd fr/unit)NO P.E.w/ P.E. (pwrd fr/unit)
See “Legend and Notes for Tables 10 and 11” on page 55.
54
Legend an d Notes for Tables 10 and 11
LEGEND:
BRKR---Circuit breaker
C.O.--- Convenience outlet
DISC.--- Disconnect
FLA--- Full load amps
LRA--- Locked rotor amps
MCA---Minimum circuit amps
P.E .---P o w e r e x h a u s t
Pwrd fr/ unit---Powered from unit
PWRD C.O.---Powered convenience outlet
UNPWR C.O. ---Unpowered convenience outlet
NOTES:
1. In complianc e with NEC requirements for multim otor and combin ati on load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective device
for the unit shall be fuse or HACR breaker. Cana dian units may be fuse or circuit
breaker.
2. For 208/230 v units, where one value is shown it is the same for either 208 or
230 volts.
3. 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 percentage of voltage
imbalance.
% Voltage Imbalance= 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, cont act
your local electric utility company immediately.
(224 + 231 + 226)
3
=227
4
227
= 1.76%
681
=
3
50TC
55
50TC
Economizer2 Position Damper
Fig. 76 -- EconoMi$erRIV Wiring
Step 11 — Adjust Factory--Installed Options
Smoke Detectors —
Smoke detector(s) will be connected at the Central
Terminal Board (CTB), at terminals marked “Smoke
Shutdown”. Remove jumper JMP 3 when ready to
energize unit.
EconoMi$er IV Occupancy Switch —
Refer to Fig. 76 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Central Terminal Board.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY on CTB. Remove or cut jum per JMP 2 to
complete the installation.
Step 12 — Install Accessories
Available accessories include:
Roof Curb
Thru--base connection kit (must be installed before unit
is set on curb)
Manual outside air damper
Two--Position motorized outside air damper
Unit Without Economizer or
2 Position Damper
C08631
EconoMi$er IV (with control and integrated barometric
relief)
EconoMi$er2 (without control/for external signal and
integrated barometric relief)
Power Exha ust
Differential dry--bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
Electric Heaters
Single Point kits
Low Ambient Controls
Thermostat / Sensors
CO
Refer to separate installation instructions for information
on installing these accessories.
56
Step 13 — Check Belt Tension
Measure the belt span length as shown in Fig. 77.
Calculate the required deflection by multiplying the belt
span length by
32 inches: 32 x
Belt Force -- Deflection Method --
Check the belt tension with a spring--force belt force
deflection gauge.
1. Place a straightedge along the belt between the two
pulleys. Measure the distance between the motor shaft
and the blower shaft.
1
/64. For exam ple, if the belt span length is
1
/64=1/2inch deflection.
2. Set the tension gauge to the desired tension (see T able 1
in Fig. 77). Place the large O--ring at that point.
3. Press the tension checker downward on the belt until
the large O--ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate
front bolts and rear bolt (see Fig. 78) and sliding the plate
towards the fan (to reduce tension) or away from the fan
(to increase tension). Ensure the blower shaft and motor
shaft are parallel to each other (pulleys aligned). Tighten
all bolts securely when finished.
50TC
Fig. 77 -- V--Belt Force Label
57
C160146
MOUNTING
BOLTS (4)
50TC
Fig. 78 -- Belt Drive Motor Mounting
Pre--Start and Start--Up
This completes the mechanical installation of the unit.
Refer to the unit’s Service Manual for detailed Pre--Start
and Start--up instructions.
BLOWER PULLEY
V-BELT
MOTOR
PULLEY
MOTOR
MOTOR MOUNTING
PLATE
C11504
ECarrier Corporation 2017Edition Date: 07/17
Manufacturer reserves the r ight to change, at any time, specifications and designs without notice and without obligations.
rinted in U.S.A.
P
58
C a t a l o g N o : 5 0 T C --- 8 --- 1 4 --- 0 2 S I
R e p l a c e s : 5 0 T C --- 8 --- 1 4 --- 0 1 S I
UNIT START-UP CHECKLIST
(Remove and Store in Job File)
NOTE:To avoid injury to personnel and damage to equipment or property when
completing the procedures listed in this start--- up checklist, use good judgement
follow safe practices, and adhere to the safety considerations/information
outlined in the preceding sections of this Installation Instructions
MODEL NO.:SERIAL NO.:
I.PRE-START-UP
j VERIFY THAT ALL PACKAGING MATERIALS HA VE BEEN REMOVED FROM UNIT
j VERIFY INSTALLATION OF OUTDOOR AIR HOOD
j VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
j VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
j CHECK THAT INDOOR--AIR FILTERS ARE CLEAN AND IN PLACE
j CHECK THAT OUTDOOR AIR INLET SCREENS ARE IN PLACE
j VERIFY THAT UNIT IS LEVEL
j CHECK FAN WHEELS AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND VERIFY
SETSCREW IS TIGHT
j VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED
j VERIFY THAT SCROLL COMPRESSORS ARE ROTATING IN THE CORRRECT DIRECTION
j VERIFY INSTALLATION OF THERMOSTAT
II. START-UP
ELECTRICAL
SUPPLY VOLTAGEL1--L2L2--L3L3--L1
document.
as
,
50TC
COMPRESSOR AMPS 1L1L2L3
COMPRESSOR AMPS 2L1L2L3
SUPPLY FAN AMPSL1L2L3
TEMPERATURES
OUTDOOR--AIR TEMPERATURE_F DB (DRY BULB)
RETURN--AIR TEMPERATURE_FDB_FWB(WETBULB)
COOLING SUPPLY AIR TEMPERA TURE_F
PRESSURES
REFRIGERANT SUCTIONCIRCUIT APSIG
CIRCUIT BPSIG
REFRIGERANT DISCHARGE CIRCUIT APSIG
CIRCUIT BPSIG
j VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
GENERAL
j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS (IF EQUIPPED )
j VERIF Y SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST
59
III. HUMIDI--MIZERRSYSTEM START-UP
STEPS
50TC
j 1. CHECK CTB FOR JUMPER 5, 6, 7
j 2. OPEN HUMIDISTAT CONTACTS
j 3. START UNIT IN COOLING (CLOSE Y1)
OBSERVE AND RECORD
j 4. CHECK UNIT CHARGE PER CHARGING CHART
j 5. SWITCH UNIT TO HIGH--LATENT MODE (SUBCOOLER) BY CLOSING HUMIDISTAT WITH Y1 CLOSED
OBSERVE
j A. REDUCTION IN SUCTION PRESSURE (5 TO 7 PSI EXPECTED)
j B. DISCHARGE PRESSURE UNCHANGED
j C. LIQUID TEMPERATURE DROPS TO 50 TO 55_F RANGE
j D. LSV SOLENOID ENGERIZED (VALVE CLOSES)
j 6. SWITCH UNIT TO DEHUMID (REHEAT) BY OPENING Y1
OBSERVE
j A. SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL
j B. DISCHARGE PRESSURE DECREASES (35 TO 50 PSI)
j C. LIQUID TEMPERATURE RETURNS TO NORMAL COOLNG LEVEL
j D. LSV SOLENOID ENERGIZED (VALVE CLOSES)
j E. DSV SOLENOID ENERGIZED, VAL VE OPENS
j 7. WITH UNIT IN DEHUMID MODE CLOSE W1
JUMPER 5, 6, 7 MUST BE CUT AND OPEN
A. SUCTION PRESSUREPSIG
B. DISCHARGE PRESSUREPSIG
C. ENTERING AIR TEMPERATURE_F
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL_F
E. CONFRIM CORRECT ROTATION FOR COMPRESSOR
F . CHECK FOR CORRECT RAMP--UP OF OJUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
j 8. OPEN W1 RESTORE UNIT TO DEHUMID MODE
j 9. OPEN HUMIDISTAT INPUT
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
j 10. RESTORE SETPOINTS FOR THERMOSTAT AND HUMIDISTAT
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
ECarrier Corporation 2017Edition Date: 07/17
Manufacturer reserves the r ight to change, at any time, specifications and designs without notice and without obligations.
rinted in U.S.A.
P
60
C a t a l o g N o : 5 0 T C --- 8 --- 1 4 --- 0 2 S I
R e p l a c e s : 5 0 T C --- 8 --- 1 4 --- 0 1 S I
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