48TC
Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puronr (R---410A) Refrigerant
Sizes: 04, 05, 06, 07
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
Factory-- Option Thru-- Base Connections
(Electrical Connections) . . . . . . . . . . . . . . . . . . . . 16
TABLE OF CONTENTS
Units without Thru-- Base Connections . . . . . . . . . 17
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 2
Field Control Wiring . . . . . . . . . . . . . . . . . . . . . . . 17
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unit without Thru-- Base Connection Kit . . . . . . . 17
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Heat Anticipator Settings . . . . . . . . . . . . . . . . . . . 17
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 5
Humidi-- MiZerR Control Connections . . . . . . . . . . 18
Roof Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Humidi-- MiZer - Space RH Controller . . . . . . . . 18
Step 2 - Plan for Sequence of Unit Installation . . . . . . 6
PremierLinkt (Factory Option) . . . . . . . . . . . . . . . 20
Curb-- Mount Installation . . . . . . . . . . . . . . . . . . . . . 6
Supply Air Temperature (SAT) Sensor . . . . . . . . . 23
Pad-- Mount Installation . . . . . . . . . . . . . . . . . . . . . . 6
Outdoor Air Temperature (OAT) Sensor . . . . . . . 23
Frame-- Mount Installation . . . . . . . . . . . . . . . . . . . . 6
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 6
Space Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Roof Curb Mount . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connect Thermostat . . . . . . . . . . . . . . . . . . . . . . . 25
Slab Mount (Horizontal Units Only) . . . . . . . . . . . 6
Configure the Unit for Thermostat Mode . . . . . . 25
Alternate Unit Support
(In Lieu of Curb or Slab Mount) . . . . . . . . . . . . . . 6
Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . 26
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . . . 8
Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 26
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 8
Indoor Air Quality (CO2 sensor) . . . . . . . . . . . . . 26
Positioning on Curb . . . . . . . . . . . . . . . . . . . . . . . . 9
Space Relative Humidity Sensor or
Humidistat Connections . . . . . . . . . . . . . . . . . . . . 27
Step 7 - Convert to Horizontal & Connect Ductwork . . 9
Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 27
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . . 9
Filter Status Switch . . . . . . . . . . . . . . . . . . . . . . . . 28
Economizer and Two Position Damper Hood
Package Removal and Setup — Factory Option . . . 9
Supply Fan Status Switch . . . . . . . . . . . . . . . . . . . 28
Economizer Hood and Two-- Position Hood . . . . . 10
Step 9 - Install Flue Hood . . . . . . . . . . . . . . . . . . . . . 10
Step 10 - Install Gas Piping . . . . . . . . . . . . . . . . . . . . 10
Factory-- Option Thru-- Base Connections
(Gas Connections) . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 11 - Install External Condensate Trap and Line . . 13
Step 12 - Make Electrical Connections . . . . . . . . . . . 14
Field Power Supply . . . . . . . . . . . . . . . . . . . . . . . . 14
Units with Factory-- Installed Disconnect . . . . . . . 14
Units without Factory-- Installed Disconnect . . . . 15
All Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . 15
Remote Occupied Switch . . . . . . . . . . . . . . . . . . . 28
Power Exhaust (output) . . . . . . . . . . . . . . . . . . . . . 28
CCN Communication Bus . . . . . . . . . . . . . . . . . . 28
RTU Open Control System . . . . . . . . . . . . . . . . . . . 30
Supply Air Temperature (SAT) Sensor . . . . . . . . . 33
Outdoor Air Temperature (OAT) Sensor . . . . . . . 33
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Space Temperature (SPT) Sensors . . . . . . . . . . . . 34
Indoor Air Quality (CO2) Sensor . . . . . . . . . . . . . 34
Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 35
Space Humidity Sensor or Humidistat . . . . . . . . . 35
Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 36
!
Connecting Discrete Inputs . . . . . . . . . . . . . . . . . . 36
Communication Wiring - Protocols . . . . . . . . . . . . 37
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at
pressure greater than 0.5 psig (3450 Pa). Pressures
greater than 0.5 psig (3450 Pa) will cause gas valve
damage resulting in hazardous condition. If gas valve
is subjected to pressure greater than 0.5 psig (3450
Pa), it must be replaced before use. When pressure
testing field-- supplied gas piping at pressures of 0.5
psig (3450 Pa) or less, a unit connected to such piping
must be isolated by closing the manual gas valve.
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Local Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
RTU Open Troubleshooting . . . . . . . . . . . . . . . . . 38
Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . 39
Differential Enthalpy Control . . . . . . . . . . . . . . . . 39
Return Air Enthalpy Sensor . . . . . . . . . . . . . . . . . 40
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Sensor Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
48TC
WARNING
!
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 41
Supply Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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 lock(s) and lockout tag(s). Unit may have more
than one power switch.
Return Air without Economizer . . . . . . . . . . . . . . 41
Return Air with Economizer . . . . . . . . . . . . . . . . . 41
Step 13 - Adjust Factory-- Installed Options . . . . . . . . 46
Step 14 - Install Accessories . . . . . . . . . . . . . . . . . . . 46
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. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
. When you see this symbol on the
safety-- alert symbol
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
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.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr (R-- 410A) refrigerant systems operate at
higher pressures than standard R-- 22 systems. Do not
use R-- 22 service equipment or components on Puron
refrigerant equipment.
!
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Ware 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.
2
48TC
Vertical Connections / Economizer
Horizontal Connections / Economizer
Fig. 1 - Unit Dimensional Drawing
3
C09303
48TC
Fig. 1 - Unit Dimensional Drawing (cont.)
4
C09304
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 unit
drawings. See Fig. 2.
1
18” (457)
42" (1067)
18" (457)
42" (1067)
1
Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
C07459
Fig. 2 - Service Clearance Dimensional Drawing
NOTE: Consider also the effect of adjacent units.
Be sure that unit is installed such that snow will not block
the combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on
Class A, B, or C roof-- covering material when roof curb is
used.
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air. For proper unit operation, adequate combustion and
ventilation air must be provided in accordance with
Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American
National Standards Institute) and NFPA (National Fire
Protection Association) 54 TIA-- - 54-- - 84-- - 1. In Canada,
installation must be in accordance with the CAN1-- - B149
installation codes for gas burning appliances.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Locate mechanical draft system flue assembly at least 4 ft
(1.2 m) from any opening through which combustion
products could enter the building, and at least 4 ft (1.2 m)
from any adjacent building (or per local code). Locate the
flue assembly at least 10 ft (3.05 m) from an adjacent
unit’s fresh air intake hood if within 3 ft (0.91 m) of same
elevation (or per local code). When unit is located
adjacent to public walkways, flue assembly must be at
least 7 ft (2.1 m) above grade.
Select a unit mounting system that provides adequate
height to allow installation of condensate trap per
requirements. Refer to Step 11 — Install External
Condensate Trap and Line – for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
Table 1 – Operating Weights
48TC
UNITS LB (KG)
A04
A05
A06
A07
483 (219)
537 (244)
569 (258)
652 (296)
Vertical
50 (23)
50 (23)
50 (23)
50 (23)
Horizontal
80 (36)
80 (36)
80 (36)
80 (36)
Humidi--- MiZer™ System
27 (10)
34 (13)
34 (13)
41 (15)
Cu Fins
25 (11)
43 (20)
56 (25)
73 (33)
Powered Outlet
32 (15)
32 (15)
32 (15)
32 (15)
14--- in/356 mm
110 (50)
110 (50)
110 (50)
110 (50)
24--- in/610 mm
145 (66)
145 (66)
145 (66)
145 (66)
Base Unit
Economizer
Curb
5
48TC
INSTALLATION
Step 2 — Plan for Sequence of Unit Installation
Step 4 — Provide Unit Support
The support method used for this unit will dictate different
sequences for the steps of unit installation. 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.
Roof Curb Mount —
48TC
Curb-- mounted Installation —
Install curb
Install field-- fabricated ductwork inside curb
Install accessory thru-- base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 11 for
details)
Rig and place unit
Install outdoor air hood
Install flue hood
Install gas piping
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 flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame-- mounted Installation —
Frame-- mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Accessory roof curb details and dimensions are shown in
Fig. 3. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 3. Improperly applied
gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 4. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru-- the-- base power and
gas connection package must be installed before the unit
is set on the roof curb. If field-- installed thru-- the-- roof
curb gas connections are desired, use factory-- supplied
1/ - in. pipe coupling and gas plate assembly to mount the
2
thru-- the-- roof curb connection to the roof curb. Gas
connections and power connections to the unit must be
field installed after the unit is installed on the roof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-- the-- base service
connections to the basepan in accordance with the
accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron
in front of condenser coil air inlet to prevent grass and
foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb
if required.
Alternate Unit Support
(In Lieu of Curb or Slab Mount) —
A non-- combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 3 equally
spaced 4-- in. x 4-- in. (102 mm x 102 mm) pads on each
side.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
6
CRBTMPWR001A01
CRBTMPWR003A01
B
1’-9 11/16”
[551]
C
1’-4”
[406]
D ALT
DRAIN
HOLE
1 3/4”
[44.5]
GAS
POWER
[19]
NPT
CONTROL ACCESSORY
POWER
3/4”
1/2”
3/4”
[12.7]
NPT
[19]
NPT
1/2”
[12.7]
NPT
1/2”
[12.7]
NPT
ROOFCURB
ACCESSORY
A
CRRFCURB001A01
1’-2”
[356]
CRRFCURB002A01
2’-0”
[610]
UNIT SIZE
48TC**04-07
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb
(flanges of duct rest on curb).
6. Service clearance: 4 ft on each side.
7.
Direction of airflow.
8. Connector package CRBTMPWR001A01 is for
thru-the-curb type gas.
CRBTMPWR003A01 is for thru-the-base type
gas connections.
48TC
CONNECTOR
PKG. ACCY.
Fig. 3 - Roof Curb Details
7
C11349
A minimum clearance is not required around ductwork.
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.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
C06110
Fig. 4 - Unit Leveling Tolerances
Step 6 — Rig and Place Unit
48TC
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Keep unit upright and do not drop. Spreader bars are
required. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference. See Table 1 and
Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 5.
Refer to rigging instructions on unit.
Fabricate supply ductwork so that the cross sectional
dimensions are equal to or greater than the unit supply
duct opening dimensions for the first 18 in. (458 mm) of
duct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
CAUTION
!
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.
Before setting the unit onto the curb, recheck gasketing on
curb.
"B"
36"- 54"
(914-1371)
REQUIRED
SPREADER
BARS
DETAIL "A"
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
"C"
"A"
SEE DETAIL "A"
C11292
UNIT
NOTES:
DIMENSIONS
MAX WEIGHT
A
B
C
LB
KG
IN
MM
IN
MM
IN
MM
48TC --- A04
520
236
74.5
1890
38.0
965
33.5
850
48TC --- A05
575
261
74.5
1890
38.0
965
41.5
1055
48TC --- A06
605
274
74.5
1890
37.5
955
41.5
1055
48TC --- A07
690
313
74.5
1890
37.5
955
41.5
1055
1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.
2. Dimensions in ( ) are in millimeters.
3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity.
Use wooden top to prevent rigging straps from damaging unit.
Fig. 5 - Rigging Details
8
Position unit on roof curb so that the following clearances
are maintained: 1/4 in. (6.4 mm) clearance between the
roof curb and the base rail inside the front and rear, 0.0 in.
clearance between the roof curb and the base rail inside on
the duct end of the unit. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately equal to
Fig. 3, section C-- C.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Flue vent discharge must have a minimum horizontal
clearance of 4 ft (1220 mm) from electric and gas meters,
gas regulators, and gas relief equipment. Minimum
distance between unit and other electrically live parts is
48 inches (1220 mm).
Flue gas can deteriorate building materials. Orient unit such
that flue gas will not affect building materials. Locate
mechanical draft system flue assembly at least 48 in. (1220
mm) from an adjacent building or combustible material.
NOTE: Installation of accessory flue discharge deflector
kit will reduce the minimum clearance to combustible
material to 18 in. (460 mm).
After unit is in position, remove rigging skids and
shipping materials.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
Step 8 — Install Outside Air Hood
Economizer and Two Position Damper Hood
Package Removal and Setup - Factory Option
NOTE: Economizer and two position damper are not
available as factory installed options for single phase (-- 3
voltage code) models.
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. 7.)
FILTER ACCESS PANEL
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. 6.
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
Fig. 7 - Typical Access Panel Locations
C06023
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. 8) Be careful to not damage any wiring or cut
tie-- wraps securing any wiring.
Hood Parts
Plastic Tie Wrap
Qty (2)
Fig. 6 - Horizontal Conversion Panels
C06108
Screws for Metal Tray
Qty (2)
Field-- supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
Fig. 8 - Economizer and Two--Position Damper
Hood Parts Location
9
C08639
48TC
Positioning on Curb —
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per the
steps outlined in Economizer Hood and Two–Position
Hood, below.
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 11.
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.
Economizer Hood and Two-- Position Hood —
NOTE: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be
used and must be discarded. Save the aluminum filter for
use in the power exhaust hood assembly.
1. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 9.
DIVIDER
48TC
TOP
PANEL
OUTSIDE
AIR
HOOD
CLEANABLE
ALUMINUM
FILTER
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
BAROMETRIC
RELIEF
FILTER
CLIP
INDOOR
COIL
ACCESS
PANEL
Fig. 9 - Indoor Coil Access Panel Relocation
C06025
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. 10.
FILTER
Fig. 11 - Economizer Filter Installation
C08634
Step 9 — Install Flue Hood
Flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove from shipping
location and using screws provided, install flue hood and
screen in location shown in Fig. 12.
TOP
PANEL
INDOOR COIL
ACCESS PANEL
LEFT
HOOD
SIDE
BLOWER
ACCESS
PANEL
SCREW
19 1/16”
B
(483mm)
Fig. 12 - Flue Hood Details
C07081
33 3/8”
(848mm)
Step 10 — Install Gas Piping
HOOD DIVIDER
Fig. 10 - Economizer Hood Construction
C06026
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. 10 and 11. Secure hood divider with 2 screws on
Installation of the gas piping must be accordance with
local building codes and with applicable national codes.
In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel
Gas Code (NFGC). In Canada, installation must be
accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea level. Unit
10
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
MIN
MAX
48TC**
04, 05, 06, 07
4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
48TCF*
(High Heat units only)
05, 06, 07
5.0 in. wg
(1245 Pa)
13.0 in. wg
(3240 Pa)
!
X
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
GAS
REGULATOR*
MANUAL GAS
SHUTOFF VALVE*
BASE UNIT
48” MINIMUM
DRIP LEG
PER NFGC*
BASE RAIL
FIELD-FABRICATED
SUPPORT*
ROOF
CURB
FROM
GAS
METER
LEGEND
NFGC – National Fuel Gas Code
* Field supplied.
NOTE: Follow all local codes.
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACING OF SUPPORTS
X DIMENSION
(ft)
1/
2
3/ or 1
4
1
1 /4 or larger
6
8
10
C11091
Fig. 13 - Gas Piping Guide
(with Accessory Thru-- the-- Curb Service Connections)
Factory-- Option Thru-- Base Connections
(Gas Connections)—
This service connection kit consists of a 1/2 - in NPT gas
adapter fitting (brass), a 1/2 - in electrical bulkhead
connector and a 3/4 - in electrical bulkhead connector, all
factory-- installed in the embossed (raised) section of the
unit basepan in the condenser section.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve,
the installer MUST use a backup wrench to prevent
damage to the valve.
Install a gas supply line that runs to the unit heating
section. Refer to the NFPA 54/NFGC or equivalent code
for gas pipe sizing data. Do not use a pipe size smaller
than 1/2 - in. Size the gas supply line to allow for a
maximum pressure drop of 0.5-- in wg (124 Pa) between
gas regulator source and unit gas valve connection when
unit is operating at high-- fire flow rate.
The gas supply line can approach the unit in three ways:
horizontally from outside the unit (across the roof),
thru-- curb/under unit basepan (accessory kit required) or
through unit basepan (factory-- option or accessory kit
required). Consult accessory kit installation instructions
for details on these installation methods. Observe
clearance to gas line components per Fig. 13.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3 TO 6 TON UNITS.
STAINLESS STEEL FITTING FOR 7 1/2 TO 12 1/2 TON.
Fig. 14 - Fittings
C08015
The thru-- base gas connector has male and female threads.
The male threads protrude above the basepan of the unit;
the female threads protrude below the basepan.
Check tightness of connector lock nuts before connecting
gas piping.
Install a 1/2 - in NPT street elbow on the thru-- base gas
fitting. Attach a 1/2 - in pipe nipple with minimum length
of 16-- in (406 mm) (field-- supplied) to the street elbow
and extend it through the access panel at the gas support
bracket. See Fig. 15.
11
48TC
may be field converted for operation at elevations above
2000 ft (610 m) and/or for use with liquefied petroleum
fuel. See accessory kit installation instructions regarding
these accessories.
NOTE: Furnace gas input rate on rating plate is for
installation up to 2000 ft (610 m) above sea level. In U.S.A.
the input rating for altitudes above 2000 ft (610 m) must be
derated by 4% for each 1000 ft (305 m) above sea level. In
Canada the input rating must be derated by 10% for altitudes
of 2000 ft (610 m) to 4500 ft (1372 m) above sea level.
For natural gas applications, gas pressure at unit gas
connection must not be less than 4 in. wg (996 Pa) or greater
than 13 in. wg (3240 Pa) while the unit is operating. On
48TCF*05--07 (high--heat) units, the gas pressure at unit gas
connection must not be less than 5 in. wg (1245 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is operating.
For liquified petroleum applications, the gas pressure must
not be less than 11 in. wg (2740 Pa) or greater than 13.6 in.
wg (3390 Pa) at the unit connection.
The gas supply pipe enters the unit at the burner access
panel on the front side of the unit, through the long slot at
the bottom of the access panel. The gas connection to the
unit is made to the 1/2 - in. FPT gas inlet port on the unit
gas valve
9” (229mm) min
Burner
Access
Panel
Union
Thru-Curb Adapter
EMBOSSMENT
SUPPORT
BRACKET
BRASS FITTING
FOR 3-6 TON UNITS
C08016
48TC
Fig. 15 - Gas Line Piping for 3 to 6 Ton Units Only
Unit Base Rail
Other hardware required to complete the installation of the
gas supply line will include a manual shutoff valve, a
sediment trap (drip leg) and a ground--joint union. A
pressure regulator valve may also be required (to convert gas
pressure from pounds to inches of pressure). The manual
shutoff valve must be located within 6--ft (1.83 m) of the
unit. The union, located in the final leg entering the unit,
must be located at least 9--in (230 mm) away from the
access panel to permit the panel to be removed for service.
If a regulator valve is installed, it must be located a
minimum of 4--ft (1220 mm) away from the unit’s flue
outlet. Some municipal codes require that the manual shutoff
valve be located upstream of the sediment trap. See Figures
16 and 17 for typical piping arrangements for gas piping that
has been routed through the sidewall of the curb. See Fig. 18
for typical piping arrangement when thru--base is used.
Ensure that all piping does not block access to the unit’s
main control box or limit the required working space in front
of the control box.
Drip
Leg
Shut Off
Valve
Fig. 17 - Gas Piping
C07470
9” (229mm) min
Fig. 18 - Gas Piping Thru-- Base Connections
Thru-Curb Adapter
Union
Unit Base Rail
Shut Off
Valve
Drip
Leg
Fig. 16 - Gas Piping
C07469
C08018
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFPA
54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA
B149.1). In the absence of local building codes, adhere to
the following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe
1/4-- in. in every 15 ft (7 mm in every 5 m) to prevent
traps. Grade all horizontal runs downward to risers.
Use risers to connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appropriate straps, hangers, etc. Use a minimum of one
hanger every 6 ft (1.8 m). For pipe sizes larger than
1/ - in., follow recommendations of national codes.
2
3. Apply joint compound (pipe dope) sparingly and only
to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of
liquefied petroleum gases as specified by local and/or
national codes. If using PTFE (Teflon) tape, ensure
the material is Double Density type and is labeled for
use on gas lines. Apply tape per manufacturer’s instructions.
12
!
WARNING
Step 11 — Install External Condensate Trap
and Line
The unit has one 3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 20. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
When using the standard side drain connection, 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 1/2 - in. square socket drive extension.
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 1/2 - in.
square socket drive extension) and install it in the side
drain connection.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 21.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
S Connect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
S Never purge a gas line into a combustion chamber.
S Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections.
S Use proper length of pipe to avoid stress on gas
control manifold.
CONDENSATE PAN (SIDE VIEW)
STANDARD
DRAIN PLUG
SIDE DRAIN
(FACTORY-INSTALLED)
ALTERNATE
BOTTOM DRAIN
Fig. 20 - Condensate Drain Pan (Side View)
NOTE: If orifice hole appears damaged or it is suspected
to have been redrilled, check orifice hole with a numbered
drill bit of correct size. Never redrill an orifice. A
burr-- free and squarely aligned orifice hole is essential for
proper flame characteristics.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
C08021
BASE RAIL
OPEN
VENT
2˝ (51) MIN
TO ROOF
DRAIN
SEE NOTE
DRAIN PLUG
ROOF
CURB
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) trap is recommended
.
Fig. 21 - Condensate Drain Piping Details
BURNER
ORIFICE
Fig. 19 - Orifice Hole
A93059
C08022
All units must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do
not use a pipe size smaller than the unit connection
( 3/4 -in.).
13
48TC
4. Pressure-- test all gas piping in accordance with local
and national plumbing and gas codes before connecting piping to unit.
NOTE: Pressure test the gas supply system after the gas
supply piping is connected to the gas valve. The supply
piping must be disconnected from the gas valve during the
testing of the piping systems when test pressure is in
excess of 0.5 psig (3450 Pa). Pressure test the gas supply
piping system at pressures equal to or less than 0.5 psig
(3450 Pa). The unit heating section must be isolated from
the gas piping system by closing the external main manual
shutoff valve and slightly opening the ground-- joint union.
Check for gas leaks at the field-- installed and
factory-- installed gas lines after all piping connections
have been completed. Use soap-- and-- water solution (or
method specified by local codes and/or regulations).
Step 12 — Make Electrical Connections
48TC
!
Units Without Disconnect Option
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
cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in
accordance with NEC (National Electrical Code);
ANSI/NFPA 70, latest edition (in Canada, Canadian
Electrical
Code
CSA
[Canadian
Standards
Association] C22.1), and local electrical codes.
13
11
IFC
13
Disconnect
per
NEC
13
or
TB
(1-ph
IFM)
Disconnect
per
NEC
L1
208/230-1-60
L2
L3
208/230-3-60
460-3-60
375-3-60
575-3-60
Units With Disconnect Option
2
L1
NOTE: Field-- supplied wiring shall conform with the
limitations of minimum 63_F (33_C) rise.
L2
4
L3
6
Field Power Supply —
If equipped with optional Powered Convenience Outlet:
The power source leads to the convenience outlet’s
transformer primary are not factory connected. Installer
must connect these leads according to required operation
of the convenience outlet. If an 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 unit without a unit-- mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan contactor IFC pressure lugs
with unit field power leads.
C
C
11
1
Optional
Disconnect
Switch
3
Factory
Wiring
5
Disconnect factory test leads; discard.
Fig. 22 - Power Wiring Connections
C07494
Units with Factory-- Installed Disconnect —
The factory-- installed option disconnect switch is located
in a weatherproof enclosure located under the main
control box. The manual switch handle is accessible
through an opening in the access panel. Discard the
factory test leads (see Fig. 22).
!
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 48TC unit. Use only copper wire.
(See Fig. 23.)
Refer to Fig. 26 for power transformer connections and the
discussion on connecting the convenience outlet on page 15.
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 #2 AWG
(copper only). (See Fig. 22.)
ELECTRIC
DISCONNECT
SWITCH
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.
COPPER
WIRE ONLY
ALUMINUM
WIRE
Fig. 23 - Disconnect Switch and Unit
14
A93033
Units Without Factory-- Installed Disconnect —
Pwd-CO
Transformer
Convenience
Outlet
GFCI
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.
Pwd-CO
Fuse
Switch
All Units —
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 1/4 -in. female spade connector from the 230-- v
connection and moving it to the 200-v 1/4 -in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information. Field power
wires will be connected line-- side pressure lugs on the
power terminal block or at factory-- installed option
non-- fused disconnect.
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 outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Lock-- out and tag-- out this switch, if necessary.
Control Box
Access Panel
Fig. 24 - Convenience Outlet Location
C08128
Installing Weatherproof Cover: A weatherproof
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
installed at unit installation. For shipment, the
convenience outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate
and gasket.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET. LOCK--OUT AND 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
approximately 1/2-in (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads 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 backing plate as
shown in Fig. 25. 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
Two types of convenience outlets are offered on 48TC
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. 24.
RECEPTACLE
NOT INCLUDED
BASE PLATE FOR
GFCI RECEPTACLE
NOTE: Unit powered convenience outlets are not
available as factory installed options for single phase (-- 3
voltage code) models.
Fig. 25 - Weatherproof Cover Installation
15
C09022
48TC
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. 22 and the unit
label diagram for power wiring connections to the unit
power terminal blocks and equipment ground. Maximum
wire size is #2 ga AWG per pole.
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 field wiring must comply with the NEC and local
requirements.
Non-- powered type: This type requires the field
installation of a general-- purpose 125-- volt 15-- A circuit
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.
Code Article 210, Branch Circuits, for use of convenience
outlets.
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T-- 15, non-- renewable screw-- in (Edison base)
type plug fuse.
NOTICE
48TC
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 through the unit’s control
box access panel. See Fig. 24.
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. 26.
Convenience Outlet Utilization
Maximum Intermittent use : 15 Amps 2 to 3 Hours
Maximum Continuous use : 8 Amps 24/7
50HJ542739
3.0
A9225
Fig. 27 - Convenience Outlet Utilization Notice Label
Duty Cycle: the unit-- powered convenience outlet has a
duty cycle limitation. The transformer is intended to
provide power on an intermittent basis for service tools,
lamps, etc; it is not intended to provide 15-- amps loading
for continuous duty loads (such as electric heaters for
overnight use). Observe a 50% limit on circuit loading
above 8-- amps.
Convenience outlet usage rating:
Continuous usage: 8 amps maximum
Intermittent usage: up to 15 amps maximum for
up to 2 hours maximum
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.
Factory-- Option Thru-- Base Connections (Electrical
Connections)—
C08283
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230
240
L1: RED +YEL
L2: BLU + GRA
H1 + H3
H2 + H4
460
480
L1: RED
Splice BLU + YEL
L2: GRA
H1
H2 + H3
H4
575
600
L1: RED
L2: GRA
H1
H2
Fig. 26 - Powered Convenience Outlet Wiring
Using unit-- mounted convenience outlets: Units with
unit-- mounted 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 outlet power is also checked and
de-- energization is confirmed. Observe National Electrical
This service connection kit consists of a 1/2 - in NPT gas
adapter fitting (brass), a 1/2 - in electrical bulkhead
connector and a 3/4 - in electrical bulkhead connector, all
factory-- installed in the embossed (raised) section of the
unit basepan in the condenser section. The 3/4 - in
bulkhead connector enables the low-- voltage control wires
to pass through the basepan. The 1/2 - in electrical
bulkhead connector allows the high-- voltage power wires
to pass through the basepan. See Fig. 14.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-- supplied and field-- installed liquid tight 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 disconnect (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.
16
Units without Thru-- Base Connections —
Typical
Thermostat
Connections
1. Install power wiring conduit through side panel openings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 22.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 10. 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 Table 10, Note 2 to
determine the percent of voltage imbalance. Operation on
improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any
applicable Carrier warranty.
X
C
G
G
W2
W2
W1
W1
(Note 1)
Y2
(Note 2)
Y1
Y1
R
R
T
H
E
R
M
O
S
T
A
T
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
Instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired.
Field Wiring
Fig. 28 - Low-- Voltage Connections
C08069
Thermostat —
Unit without Thru-- Base Connection Kit —
Install a Carrier-- approved accessory thermostat according
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 thermostat 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.
Pass the thermostat control wires through the hole
provided in the corner post; 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 Controls Connection Board. See Fig. 29.
NOTE: If thru-- the-- bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 29 - Field Control Wiring Raceway
C08027
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.
17
48TC
C
O/B/Y2
Field Control Wiring —
The 48TC unit requires an external temperature control
device. This device can be a thermostat (field-- supplied)
or a PremierLink 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 (RTU Open is available as a
factory-- installed option only).
Central
Terminal
Board
Humidi--MiZerR Control Connections
48TC
Humidi-- MiZer – Space RH Controller —
NOTE: The Humidi-- MiZer is a factory installed option
which is only available for units equipped with belt-- drive
motors. Humidi-- MiZer is not available for single phase
(-- 3 voltage code) models.
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 EDGER Pro Thermidistat with
isolated contact set for dehumidification control. The
humidistat is normally used in applications where a
temperature control is already provided (units with
PremierLinkt 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 built into the corner
post (see Fig. 29) 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. 32.
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 built into the corner
post (see Fig. 29) 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. 33).
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
instructions included with the Carrier Edge
Thermidistat device (Form 33CS-- 65SI or latest) for
more information.
% RELATIVE HUMIDITY
C09295
Fig. 30 - Accessory Field-- Installed Humidistat
®
Fig. 31 - EDGE Pro Thermidistat
18
C09296
48TC
HUMIDSTAT
Fig. 32 - Typical Humidi-- MiZerR Adaptive Dehumidification System Humidistat Wiring
EDGE Pro THERMIDISTAT
C11293
Unit CTB
THERMOSTAT
X*
Rc
Rh
W1
G
Y2
C
O/W2/B
Y1
C
G
W2
W1
Y2
Y1
OAT
RRS
SRTN
HUM
D1
D2
V+
Vg
R
Humidi-MiZer™ FIOP
*Connection not required.
Fig. 33 - Typical Rooftop Unit with Humidi-- MiZer Adaptive Dehumidification System
with EDGE Pro Thermidistat Device
19
C09298
48TC
PremierLinkt (Factory--Option)
Fig. 34 - PremierLink Controller
C08199
The PremierLink controller (see Fig. 34) is compatible
with Carrier Comfort Networkr (CCN) devices. This
control is designed to allow users the access and ability to
change factory-- defined settings, thus expanding the
function of the standard unit control board. CCN service
access tools include System Pilot (TM), Touch Pilot (TM)
and Service Tool. (Standard tier display tools Navigatort
and Scrolling Marquee are not suitable for use with latest
PremierLink controller (Version 2.x).)
of the PremierLink controller. The factory-- installed
PremierLink control includes the supply-- air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$ert2 package.
The PremierLink control is factory-- mounted in the 48TC
unit’s main control box to the left of the Central Terminal
Board (CTB) (see Fig. 35). Factory wiring is completed
through harnesses connected to the CTB thermostat. Field
connections are made at a 16-- pole terminal block (TB1)
located on the bottom shelf of the unit control box in front
NOTE: PremierLink controller is shipped in Sensor
mode. To be used with a thermostat, the PremierLink
controller must be configured to Thermostat mode. Refer
to PremierLink Configuration instructions for Operating
Mode.
The PremierLink controller requires the use of
electronic thermostat or a CCN connection
broadcast to initiate its internal timeclock.
necessary for broadcast of time of day
(occupied/unoccupied).
Fig. 35 - 48TC Control Box – PremierLink Location
20
a Carrier
for time
This is
functions
C11294
48TC
Fig. 36 - PremierLink Wiring Schematic
21
C11289
48TC
Fig. 37 - PremierLink Wiring Schematic with Humidi-- MiZerR
22
C11290
Supply Air Temperature (SAT) Sensor —
NOTE: The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit’s heater surfaces.
On FIOP-- equipped 48TC unit, the unit is supplied with a
supply-- air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6-- inches (152
mm) in length. It is a nominal 10-- k ohm thermistor.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory-- mounted in the EconoMi$er2 (FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
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-- air
opening or in the supply air duct (as required by local
codes). Drill or punch a 1/2 - in. hole in the flange or duct.
Use two field-- supplied, self-- drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 38.
EconoMi$er2 —
Outdoor air management functions can be enhanced with
field-- installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO2 sensor
Outdoor air CO2 sensor
Refer to Table 3 for accessory part numbers.
SUPPLY AIR
TEMPERATURE
SENSOR
Field Connections
ROOF
CURB
SUPPLY AIR
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 Figs. 36 and 37). Some input devices also 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 at the
PremierLink board inputs).
RETURN AIR
C08200
Fig. 38 - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
NOTE:
Refer to Form 33CS-- 68SI for complete
PremierLink configuration, operating sequences and
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
APPLICATION
OUTDOOR AIR
TEMPERATURE
SENSOR
RETURN AIR
TEMPERATURE
SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
Differential Dry Bulb
Temperature with
PremierLink
(PremierLink requires
4---20 mA Actuator)
Included --CRTEMPSN001A00
Required --33ZCT55SPT
or equivalent
---
---
Single Enthalpy with
PremierLink
(PremierLink requires
4---20mA Actuator)
Included --Not Used
---
Requires --33CSENTHSW
---
Differential Enthalpy
with PremierLink
(PremierLink requires
4---20mA Actuator)
Included --Not Used
---
Requires --33CSENTHSW
or equivalent
Requires --33CSENTSEN
or equivalent
NOTES:
CO2 Sensors (Optional):
33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 --- Aspirator box used for duct--- mounted CO2 room sensor.
33ZCT55CO2 --- Space temperature and CO2 room sensor with override.
33ZCT56CO2 --- Space temperature and CO2 room sensor with override and setpoint.
23
48TC
The PremierLink control is used with EconoMi$er2
(option or accessory) for outdoor air management. The
damper position is controlled directly by the PremierLink
control; EconoMi$er2 has no internal logic device.
Table 4 – Space Sensor Mode
FIELD CONNECTION
INPUT SIGNAL
1
T55---SEN/T56---SEN
Analog (10k thermistor)
2
RMTOCC
Discrete, 24VAC
3
T55---SEN/T56---SEN
Analog (10k thermistor)
4
CMPSAFE
Discrete, 24VAC
5
T56---SET
Analog (10k thermistor)
6
FSD
Discrete, 24VAC
7
LOOP---PWR
Analog, 24VDC
48TC
TB1 TERMINAL
LEGEND:
T55
T56
CCN
CMPSAFE
FILTER
8
SPS
Discrete, 24VAC
9
IAQ ---SEN
Analog, 4---20mA
10
FILTER
Discrete, 24VAC
11
IAQ ---COM/OAQ ---COM/RH ---COM
Analog, 4---20mA
12
CCN + (RED)
Digital, , 5VDC
13
OAQ ---SEN/RH ---SEN
Analog, 4---20mA
14
CCN Gnd (WHT)
Digital, 5VDC
15
AUX OUT(Power Exhaust)
(Output)Discrete 24VAC
16
CCN --- (BLK)
Digital, 5VDC
-----------
Space Temperature Sensor
Space Temperature Sensor
Carrier Comfort Network (communication bus)
Compressor Safety
Dirty Filter Switch
FSD --IAQ --OAQ --RH --SFS ---
Fire Shutdown
Indoor Air Quality (CO2)
Outdoor Air Quality (CO2)
Relative Humidity
Supply Fan Status
Table 5 – Thermostat Mode
TB1 TERMINAL
FIELD CONNECTION
INPUT SIGNAL
1
RAT SEN
Analog (10k thermistor)
2
G
Discrete, 24VAC
3
RAT SEN
Analog (10k thermistor)
4
Y1
Discrete, 24VAC
6
Y2
Discrete, 24VAC
7
LOOP---PWR
Analog, 24VDC
5
LEGEND:
CCN
--G
--IAQ
--OAQ
--RAT
---
8
W1
Discrete, 24VAC
9
IAQ ---SEN
Analog, 4---20mA
10
W2
Discrete, 24VAC
11
IAQ ---COM/OAQ ---COM/RH ---COM
Analog, 4---20mA
12
CCN + (RED)
Digital, 5VDC
13
OAQ ---SEN/RH ---SEN
Analog, 4---20mA
14
CCN Gnd (WHT)
Digital, 5VDC
15
AUX OUT (Power Exhaust)
(Output) Discrete 24VAC
16
CCN --- (BLK)
Digital, 5VDC
Carrier Comfort Network (communication bus)
Thermostat Fan
Indoor Air Quality (CO2)
Outdoor Air Quality (CO2)
Return Air Temperature
RH
W1
W2
Y1
Y2
24
-----------
Relative Humidity
Thermostat Heat Stage 1
Thermostat Heat Stage 2
Thermostat Cool Stage 1
Thermostat Cool Stage 2
Space Sensors —
SEN
The PremierLink 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
control. 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.
SEN
TB1
PL
1
J6-7
TB1
3
PL
J6-6
5
J6-5
Jumper
SET
SET
C08213
Fig. 42 - PremierLink T-- 56 Sensor
1
2
4
3
5
6
RED(+)
WHT(GND)
BLK(-)
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 PremierLink TB1 as shown in Fig. 43.
CCN COM
SEN
SW1
BRN (GND)
BLU (SPT)
SENSOR WIRING
If the 48TC unit is equipped with factory-- installed smoke
detector(s), disconnect the factory BLU lead at TB1-- 6
(Y2) before connecting 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 PremierLink J4-- 8.
C08201
Fig. 39 - T-- 55 Space Temperature Sensor Wiring
Connect T-- 55: See Fig. 39 for typical T-- 55 internal
connections. Connect the T-- 55 SEN terminals to TB1
terminals 1 and 3 (see Fig. 40).
SPACE
THERMOSTAT
CTB
THERMOSTAT
R
R
TB1
G
2
PL
J4-12
TB1
PL
Y1
4
J4-10
SEN
1
J6-7
Y2
6
J4-8
SEN
3
J6-6
W1
8
J4-6
W2
10
J4-4
C
C
C08212
Fig. 40 - PremierLink T-- 55 Sensor
Connect T-- 56: See Fig. 41 for T-- 56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T-- 56 terminals to TB1 terminals 1, 3
and 5 (see Fig. 42).
1
2
3
4
SEN
SW1
5
6
RED(+)
WHT(GND)
BLK(-)
CCN COM
C08119
If the 48TC unit has an economizer system and
free-- cooling operation is required, a sensor representing
Return Air Temperature must also be connected
(field-- supplied and installed). This sensor may be a T-- 55
Space Sensor (see Fig. 39) 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. 40.
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.
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Cool
Fig. 43 - Space Thermostat Connections
Configure the Unit for Thermostat Mode —
SET
BLK
(T56)
BRN (GND)
BLU (SPT)
CTB
THERMOSTAT
Warm
Fig. 41 - T-- 56 Internal Connections
‘
C08202
When the PremierLink is configured for Thermostat
Mode, these functions are not available: Fire Shutdown
(FSD), Remote Occupied (RMTOCC), Compressor Safety
(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure
Switch (FILTER).
25
48TC
Connect Thermostat —
Economizer Controls
IAQ Sensor
SEN
TB1
9
PL
J5-5
COM
TB1
11
J5-3
Indoor Air Quality (CO2) Sensor —
The indoor air quality sensor accessory monitors space
carbon dioxide (CO2) levels. This information is used to
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 CO2 present in the space air.
48TC
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
requirements and terminal locations. See Fig. 44 for
typical CO2 sensor wiring schematic.
24 VAC
Fig. 45 - Indoor CO2 Sensor (33ZCSENCO2)
Connections
C08636
Refer to Form 33CS-- 68SI, PremierLink Installation,
Start-- up, and Configuration Instructions, for detailed
configuration information
Outdoor Air Quality Sensor
(PNO 33ZCSENCO2 plus weatherproof enclosure) —
The outdoor air CO2 sensor is designed to monitor carbon
dioxide (CO2) levels in the outside ventilation air and
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 46. The outdoor air CO2 sensor must be located in the
economizer outside air hood.
+ 0-10VDC
- SIG COM
+ 4-20mA
ALARM
NC
COM RELAY
NO CONTACTS
}
H G 24 VAC
OR
+ - 24 VDC
2 1
J3
8765432 1
J4
C08635
Fig. 44 - 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 CO2
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.
COVER REMOVED
SIDE VIEW
Fig. 46 - Outdoor Air Quality Sensor Cover
C07135
Wiring the Outdoor Air CO2 Sensor: 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.
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. 44. Connect the 4 to 20 mA
terminal to the TB1-- 13 terminal of the 48TC. Connect the
SIG COM terminal to the TB1-- 11 terminal of the 48TC.
See Fig. 47.
OAQ Sensor/RH Sensor
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 44. Connect the 4-- 20 mA terminal to
terminal TB1-- 9 and connect the SIG COM terminal to
terminal TB1-- 11. See Fig. 45.
SEN
TB1
13
PL
J5-2
COM
TB1
11
J5-3
24 VAC
Fig. 47 - Outdoor CO2 Sensor Connections
26
C08275
Space Relative Humidity Sensor or Humidistat
Connections —
NOTE: The accessory space relative humidity sensor and
humidistat are not available for single phase (-- 3 voltage
code) models.
Space Relative Humidity Sensor connections: The
accessory space relative humidity sensor (33ZCSENSRH-01)
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.
TB1-7
CAUTION
!
BLACK
48TC
TB1-13
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.
RED
!
The sensor must be mounted vertically on the wall. The
Carrier logo should be orientated 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. ACCN 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. 49 for wiring details.
Io Vin Gnd Vo
CAUTION
UNIT PERFORMANCE HAZARD
Failure to follow this caution will result in inaccurate
sensor readings.
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 baseboard 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. 48.
MOUNTING
HOLES
Io
Vin
Gnd
WIRING
OPENING
Vo
C11180
Fig. 49 - Space Relative Humidity Sensor Connection
The power for the sensor is provided by the PremierLink
control 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. 48.
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 PremierLink is
configured for (Space) Sensor Mode. The unit is
factory-- wired for PremierLink FSD operation when
PremierLink is factory-- installed.
SW2
1
2
3
4
5
6
ON
C11084
Fig. 48 - Space Relative Humidity Sensor Installation
On 48TC 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
communicates the smoke detector’s tripped status to the
CCN building control. See Figs. 36 and 37, PremierLink
wiring schematics.
27
Filter Status Switch —
Remote Occupied Switch —
This function is available only when PremierLink is
configured for (Space) Sensor Mode.
The PremierLink control 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.
PremierLink control 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. 50.
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. 52).
Remote Occupied
CTB
Thermostat
R
Time Clock
TB1
2
Filter Switch (NO, close on rising pressure (high drop))
48TC
CTB
Thermostat
C08214
Fig. 52 - PremierLink Wiring Remote Occupied
R
TB1
10
PL
J4-4
C08216
Fig. 50 - PremierLink 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 PremierLink causes the filter status point to
read “DIRTY”.
Refer to Form 33CS-- 68SI for 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. 53.
Power Exhaust
Using Filter Timer Hours: Refer to Form 33CS-- 68SI for
instructions on using the PremierLink Configuration
screens and on unit alarm sequence.
PEC
Supply Fan Status Switch —
The PremierLink control 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 the 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. 51.
Fan (Pressure) Switch (NO, close on rise in pressure)
CTB
Thermostat
R
TB1
8
PL
J4-12
PL
J4-6
C08118
Fig. 51 - PremierLink Wiring Fan Pressure Switch
Connection
TAN
TB1
15
GRA
CTB
THERMOSTAT
C
PL
J8-3
C08120
Fig. 53 - PremierLink Power Exhaust Output
Connection
NOTE: The Power Exhaust and Humidi-- MiZerR options
can not be used with PremierLink 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.
28
Connecting CCN bus:
NOTE: When connecting the communication bus cable,
a color code system for the entire network is
recommended to simplify installation and checkout. See
Table 7 for the recommended color code.
Table 7 – Color Code Recommendations
See Table 6 for recommended cable.
Table 6 – Recommended Cables
SIGNAL TYPE
CCN BUS WIRE
COLOR
CCN PLUG PIN
NUMBER
MANUFACTURER
CABLE PART NO.
+
Red
1
Alpha
2413 or 5463
Ground
White
2
American
A22503
---
Black
3
Belden
8772
Columbia
02525
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, or
polyethylene. An aluminum/polyester 100% foil shield and
an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon
with a minimum operating temperature range of - 20_C to
60_C is required. Do not run communication 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).
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. 54.
CCN Bus
+ (RED)
TB1
12
PL
J2-1
GND (WHT)
TB1
14
J2-2
– (BLK)
TB1
16
J2-3
Fig. 54 - PremierLink CCN Bus Connections
29
C08276
48TC
Communications Bus Wire Specifications: The CCN
Communication Bus wiring is field-- supplied and
field-- installed. It consists of shielded 3-- conductor cable
with drain (ground) wire. The cable selected must be
identical to the CCN Communication Bus wire used for
the entire network.
RTU Open Control System
Refer to Table 8, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
48TC
The RTU Open control is factory-- mounted in the 48TC
unit’s main control box, to the left of the CTB. See
Fig. 56. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU Open
sensors will be made at the Phoenix connectors on the
RTU Open board. The factory-- installed RTU Open
control includes the supply-- air temperature (SAT) sensor.
The outdoor air temperature (OAT) sensor is included in
the FIOP/accessory EconoMi$er2 package.
The RTU Open controller is an integrated component of the
Carrier rooftop unit. Its internal application programming
provides optimum performance and energy efficiency. RTU
Open 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 the four most popular protocols in use today:
BACnet, Modbus, Johnson N2 and LonWorks. (See Fig. 55.)
Fig. 55 - RTU Open Multi-- Protocol Control Board
30
C10811
48TC
Fig. 56 - RTU Open System Control Wiring Diagram
31
C11295
48TC
Fig. 57 - RTU Open System Control Wiring Diagram with Humidi-- MiZerR
32
C11296
Table 8 – RTU Open Controller Inputs and Outputs
TYPE OF I/O
CONNECTION PIN
NUMBER(S)
zone_temp
AI (10K Thermistor)
J20--- 1, 2
Supply Air Temperature
sa_temp
AI (10K Thermistor)
J2--- 1, 2
Outdoor Air Temperature
oa_temp
AI (10K Thermistor)
J2--- 3, 4
stpt_adj_offset
AI (100K Potentiometer)
J20--- 3
Safety Chain Feedback
safety_status
DI (24 VAC)
J1--- 9
Compressor Safety Status
comp_status
DI (24 VAC)
J1--- 2
Fire Shutdown Status
firedown_status
DI (24 VAC)
J1--- 10
Enthalpy Status
enthalpy_status
DI (24 VAC)
J2--- 6
Humidistat Input Status
humstat_status
DI (24 VAC)
J5--- 7
POINT NAME
BACnet OBJECT
NAME
DEDICATED INPUTS
Space Temp / Zone Temp
Space Temperature Offset Pot
Indoor Air CO2
iaq
AI (4--- 20 ma)
Outdoor Air CO2
oaq
AI (4--- 20 ma)
space_rh
AI (4--- 20 ma)
Supply Fan Status*
sfan_status
DI (24 VAC)
Filter Status*
filter_status
DI (24 VAC)
Door Contact Input*
door_contact_status
DI (24 VAC)
Occupancy Contact*
occ_contact_status
DI (24 VAC)
Space Relative Humidity
J4--- 2 or J4--- 5
J5--- 1 or J5--- 3 or
J5 5 or J5--- 7
OUTPUTS
Economizer Output
econ_output
AO (4--- 20ma)
J2--- 5
sfan
DO Relay (24VAC , 1A)
J1--- 4
Compressor 1 Relay State
comp_1
DO Relay (24VAC , 1A)
J1--- 8
Compressor 2 Relay State
comp_2
DO Relay (24VAC , 1A)
J1--- 7
Heat Stage 1 Relay State
heat_1
DO Relay (24VAC , 1A)
J1--- 6
Heat Stage 2 Relay State
heat_2
DO Relay (24VAC , 1A)
J1--- 5
pexh
DO Relay (24VAC , 1A)
J11--- 3
dehum
DO Relay (24VAC, 1A)
J11--- 7, 8
Supply Fan Relay State
Power Exhaust Relay State
Dehumidification Relay State
LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5--- 5 = J1--- 2 are used for field --- installation.
The RTU Open controller 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 48TC 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-- air
opening or in the supply air duct (as required by local
codes). Drill or punch a 1/2 - in. hole in the flange or duct.
Use two field-- supplied, self-- drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 38.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory-- mounted in the EconoMi$er2 (FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
EconoMi$er2 —
The RTU Open control is used with EconoMi$er2 (option
or accessory) for outdoor air management. The damper
position is controlled directly by the RTU Open control;
EconoMi$er2 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 CO2 sensor
Outdoor air CO2 sensor
33
48TC
CONFIGURABLE INPUTS
Field Connections
Field connections for accessory sensors and input devices
are made the RTU Open, at plugs J1, J2, J4, J5, J11 and
J20. All field control wiring that connects to the RTU
Open must be routed through the raceway built into the
corner post as shown in Fig. 29. 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. Connect to the wires to the removable
Phoenix connectors and then reconnect the connectors to
the board.
48TC
Space Temperature (SPT) Sensors —
There are two types of SPT sensors available from Carrier,
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 associated with space sensors.
SEN
J20-1
SEN
J20-2
Jumper
SET
SET
J20-3
C08461
Fig. 59 - RTU Open T-- 56 Sensor Connections
Connect T-- 59: The T-- 59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 60
for internal connections at the T-- 59. Connect the SEN
terminal (BLU) to RTU Open 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)
S 33ZCT55SPT, space temperature sensor with override
button (T-- 55)
OR
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment (T-- 56)
SET
SEN
OPB
COM- PWR+
J20-3
J20-2
J20-1
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment (T-- 59)
24 VAC
Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three-- conductor shielded cable for the sensor and setpoint
adjustment connections. If the setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two-- conductor, twisted pair cable may be used.
Connect T-- 55: See Fig. 39 for typical T-- 55 internal
connections. Connect the T-- 55 SEN terminals to RTU
Open J20-- 1 and J20-- 2. See Fig. 58.
SEN
J20-1
SEN
J20-2
C08460
Fig. 58 - RTU Open T-- 55 Sensor Connections
Connect T-- 56: See Fig. 41 for T-- 56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T-- 56 terminals to RTU Open J20-- 1,
J20-- 2 and J20-- 3 per Fig. 59.
SENSOR
WIRING
POWER
WIRING
NOTE: Must use a separate isolated transformer.
C10291
Fig. 60 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Indoor Air Quality (CO2) Sensor —
The indoor air quality sensor accessory monitors space
carbon dioxide (CO2) levels. This information is used to
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 CO2 present in the space air.
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
requirements and terminal locations. See Fig. 44 for
typical CO2 sensor wiring schematic.
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 CO2
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
34
J4-2
COM
J4-3
24 VAC
Fig. 61 - RTU Open / Indoor CO2 Sensor
(33ZCSENCO2) Connections
C08462
Outdoor Air Quality Sensor
(PNO 33ZCSENCO2 plus weatherproof enclosure) —
The outdoor air CO2 sensor is designed to monitor carbon
dioxide (CO2) levels in the outside ventilation air and
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 46. The outdoor air CO2 sensor must be located in the
economizer outside air hood.
Wiring the Outdoor Air CO2 Sensor: 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.
S J4-- 2 or J4-- 5 = 4-- 20mA signal input
NOTE: The factory default for dehumidification control
is normally open humidistat.
MOUNTING
HOLES
Io
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. 44. Connect the 4 to 20 mA
terminal to RTU Open J4-- 5. Connect the SIG COM
terminal to RTU Open J4-- 6. See Fig. 62
Vin
Gnd
WIRING
OPENING
Vo
5
SEN
4
IAQ Sensor
3
SW2
6
ON
OAQ Sensor
SEN
J4-5
COM
J4-6
Vin - J4-1 or J4-4 24Vdc
Io - J4-2 or J4-5 -20mA output
24 VAC
Fig. 62 - RTU Open / Outdoor CO2 Sensor
(33ZCSENCO2) Connections
C11086
C11087
Fig. 63 - Space Relative Humidity Sensor Typical Wiring
35
48TC
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 44. Connect the 4-- 20 mA terminal to
RTU Open J4-- 2 and connect the SIG COM terminal to
RTU Open J4-- 3. See Fig. 61.
NOTE: The accessory space relative humidity sensor and
humidistat are not available for single phase (-- 3 voltage
code) models.
Humidi-- MiZerR Control Wiring: In units equipped
with the Humidi-- MiZer option there are two pink (PNK)
wires loose in the control box used to control the
dehumidification function of the unit. These pink wires
are meant to be tied to a space humidistat or thermidistat
on an electromechanical unit. On RTU Open equipped
units these pink wires must be connected to J11-- 7 & 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 pink wires in pins 7 and 8, reconnect the plug
to the board at J11.
Relative Humidity Sensors (Space or Duct Mounted):
The accessory space humidity sensor (33ZCSENSRH-01)
or duct humidity sensor (33ZCSENDRH-01) is used to
measure the relative humidity of air within the space or
return air duct. 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 shield 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
supplied with the RH sensor for the electrical
requirements and terminal locations. RTU Open
configurations must be changed after adding an RH
sensor. See Fig. 63 and 64 for typical RH sensor wiring.
S J4-- 1 or J4-- 4 = 24vdc loop power
2
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.
Space Relative Humidity Sensor or Humidistat —
1
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.
J4-1 or J4-4 + 24 VDC Supply Voltage
J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output
to RTU-OPEN
Relative Humidity Sensor
(Polarized Male Connector)
SPAN
ZERO
48TC
4-20 VAC GND 0-5V
mA or
or
VDC
0-10V
Fig. 64 - Duct Relative Humidity Sensor Typical Wiring
Humidistat: The accessory humidistat provides the RTU
Open 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 configurable input 9 and tells the
RTU Open 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-- MiZerR 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 48TC 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 Figs. 56 and 57,
the RTU Open System Control wiring schematics.
The
Fire
Shutdown
Switch
configuration,
MENU→Config→Inputs→input 5, identifies the normally
open status of this input when there is no fire alarm.
Connecting Discrete Inputs —
Filter Status: The filter status accessory is a
field-- installed accessory. This accessory detects plugged
filters. When installing this accessory, the unit must be
configured
for
filter
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 55 and Fig. 56 or Fig. 57 for wire terminations at J5.
C10839
Fan Status: The fan status accessory is a field-- installed
accessory. This accessory detects when the indoor fan is
blowing air. When installing this accessory, the unit must
be
configured
for
fan
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 55 and Figs. 56 or 57 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
configured for
remote occupancy
by setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote
Occupancy and normally open (N/O) or normally closed
(N/C).
Also set MENU→Schedules→occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 55 and Table 8 for wire
terminations at J5.
Power Exhaust (output): The relay used by the RTU
Open 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 control board. This
can be provided by the unit’s transformer from various
sources. The “R” terminal on the unit’s low voltage
terminal board (LVTB) is a logical source. Refer to Fig.
55 and Figs. 56 or 57 for wire terminations at J11.
36
Communication Wiring -- Protocols
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.
The RTU Open can be set to communicate on four
different protocols: BACnet, Modbus, N2, and 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. 65 and 66 for
protocol switch settings and address switches. The 3rd
party connection to the RTU Open is through plug J19.
See Fig. 67 for wiring.
NOTE: Power must be cycled after changing the SW1-- 3
switch settings.
Refer to the RTU Open Controller Integration Guide
(Catalog No. 11--808--428--01) for more detailed information
on protocols, 3rd party wiring, and networking.
PROTOCOL
DS8
DS7
DS6
DS5
DS4
DS3
DS2
DS1
BACnet MS/TP
(Master)
Unused
OFF
OFF
OFF
ON
OFF
Select Baud
Select Baud
Modbus
(Slave)
Unused
OFF
OFF
ON
ON
OFF
Select Baud
Select Baud
N2
(Slave)
Unused
OFF
OFF
OFF
ON
ON
OFF
OFF
LonWorks
Unused
ON
ON
OFF
ON
OFF
OFF
OFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
DS2
DS1
9600
OFF
OFF
19,200
ON
OFF
38,400
OFF
ON
76,800
ON
ON
C07166
Fig. 65 - RTU Open SW3 Dip Switch Settings
Fig. 66 - RTU Open Address Switches
C10815
Fig. 67 - Network Wiring
37
C10816
48TC
SW3 Protocol Selection
Local Access
BACview6 Handheld:
Virtual BACview: Virtual BACview is a freeware computer
BACview6
RTU Open 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.
48TC
The
is a keypad/display
interface used to connect to the RTU Open to access the
control information, read sensor values, and test the RTU,
see Fig. 68. This is an accessory interface that does not
come with the RTU Open controller and can only be used
at the unit. Connect the BACview6 to the RTU Open J12
local access port. There are two password protected levels
in the display (User and Admin). The user password is
defaulted to 0000 but can be changed. The Admin
password is 1111 and cannot be changed. There is a 10
minute auto logout if a screen is idle. See Form
48-- 50HCTQ-- 01T, Appendix A for navigation and screen
content.
program that functions as the BACview6 Handheld. The
USB Link interface (USB-- L) is required to connect a
computer to the RTU Open board. The link cable connects
a USB port to the J12 local access port. This program
functions and operates identical to the handheld.
Access Port
P1
P1
Protocol Selector
RTU Open
J12
Cable
P5
P5
BACview6 Local Access Cable
Fig. 68 - BACview6 Handheld Connections
38
C10812
Table 9 – LEDs
The LEDs on the RTU Open show the status of certain functions
If this LED is on...
Status is...
Power
RTU Open has power
Rx
RTU Open is receiving data from the network segment
Tx
RTU Open is transmitting data over the network segment
DO#
The digital output is active
The Run and Error LEDs indicate control module and network status
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes per second
2 flashes,
alternating with Run LED
Five minute auto---restart delay after system error
2 flashes per second
3 flashes,
then off
Control module has just been formatted
2 flashes per second
4 flashes,
then pause
Two or more devices on this network have the
same ARC156 network address
2 flashes per second
On
Exec halted after frequent system errors or
control programs halted
5 flashes per second
On
Exec start---up aborted, Boot is running
5 flashes per second
Off
Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second, alternating with
Run LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second,
alternating with Run LED
Brownout
On
Failure. Try the following solutions:
S
Turn RTU Open off, then on.
S
Format RTU Open.
S
Download memory to RTU Open.
S
Replace RTU Open.
On
NOTE:
Refer to Catalog No. 48--50HCTQ--01T for
complete configuration of RTU Open, operating sequences
and troubleshooting information. Refer to RTU Open
Controller Integration Guide (Catalog No. 11--808--428--01)
for details on configuration and troubleshooting of connected
networks. Have a copy of these manuals available at unit
start--up.
48TC
If Run LED shows...
Enthalpy
Switch
Outdoor Air Enthalpy Control
(PNO 33CSENTHSW)
24V
RED
PL6-1 (24-V)
GND
BLK
PL6-4 (COM)
LOW
GRA
7
CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
Factory Wiring Harness
C11160
Fig. 69 - Enthalpy Switch (33CSENTHSW) Connections
The enthalpy control (33CSENTHSW) is available as a
field--installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field--installed accessory
return air enthalpy sensor (33CSENTSEN) is required for
differential enthalpy control. See Fig. 69.)
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. 69. Connect the enthalpy
control power input terminals to economizer actuator power
leads RED (connect to 24V) and BLK (connect to GND).
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.
39
Return Air Enthalpy Sensor —
Controller —
Mount the return-- air enthalpy sensor (33SENTSEN) in
the return-- air section of the economizer. The return air
sensor is wired to the enthalpy controller
(33CSENTHSW). See Fig. 70.
The controller (see Fig. 71) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
housing with a single captive screw for easy access to the
wiring terminals. The controller has three LEDs (for
Power, Trouble and Alarm) and a manual test/reset button
(on the cover face).
24V
RED
PL6-1 (24-V)
– 4-20
Main
GND
BLK
PL6-4 (COM)
+ VDC
Out
LOW
GRA
Outside Air
Enthalpy Switch
+ 24-36
VDC In
48TC
– 4-20 Main
Out
7
CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
Return Air
Enthalpy
Sensor
Duct smoke sensor
controller
C11161
Conduit nuts
(supplied by installer)
Fig. 70 - Outside and Return Air Enthalpy Sensor
Wiring
Conduit support plate
To wire the return air enthalpy sensor, perform the
following:
Terminal block cover
Controller housing
and electronics
1. Use a 2-- conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the
enthalpy controller.
2. Connect the field-- supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (-- ) spade connector on the return air
enthalpy sensor and the (-- ) terminal on the enthalpy
controller.
Cover gasket
(ordering option)
Controller cover
Conduit couplings
(supplied by installer)
Fastener
(2X)
Trouble
Alarm
Test/reset
switch
Smoke Detectors
Smoke detectors are available as factory-- installed options
on 48TC 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. Return Air smoke detectors are arranged for vertical
return configurations only. 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
and smoke detector configuration to meet project
requirements.
Units equipped with factory--optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See “Completing Installation of Return Air
Smoke Sensor:” on page 42 for details.
System —
The smoke detector system consists of a four-- wire
controller and one or two sensors. Its primary function is
to shut down the rooftop unit in order to prevent smoke
from circulating throughout the building. It is not to be
used as a life saving device.
Power
Fig. 71 - Controller Assembly
C08208
Sensor Module —
The sensor module (see Fig. 72) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling tube
inlet and an exhaust tube. The sampling tube (when used)
and exhaust tube are attached during installation. The
sampling tube varies in length depending on the size of the
rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
terminal for connecting to the controller. Each sensor has
four LEDs (for Power, Trouble, Alarm and Dirty) and a
manual test/reset button (on the left--side of the housing).
Air is introduced to the duct smoke detector sensor’s
sensing chamber through a sampling tube that extends into
the HVAC duct and is directed back into the ventilation
system through a (shorter) exhaust tube. The difference in
air pressure between the two tubes pulls the sampled air
through the sensing chamber. When a sufficient amount of
smoke is detected in the sensing chamber, the sensor
signals an alarm state and the controller automatically
40
takes the appropriate action to shut down fans and
blowers, change over air handling systems, notify the fire
alarm control panel, etc.
The sensor uses a process called differential sensing to
prevent gradual environmental changes from triggering
false alarms. A rapid change in environmental conditions,
such as smoke from a fire, causes the sensor to signal an
alarm state but dust and debris accumulated over time
does not.
Smoke Detector Sensor
C08245
Fig. 73 - Typical Supply Air Smoke Detector Sensor
Location
Return Air without Economizer —
Exhaust tube
Exhaust gasket
Sensor housing
and electronics
See
Detail A
Intake
gasket
Cover gasket
(ordering option)
TSD-CO2
(ordering option)
Sensor cover
Plug
Sampling tube
(ordered separately)
The sampling tube is located across the return air opening
on the unit basepan. See Fig. 74. The holes in the
sampling tube face downward, into the return air stream.
The sampling tube is connected via tubing to the return air
sensor that is mounted on a bracket high on the partition
between return filter and controller location. (This sensor
is shipped in a flat-- mounting location. Installation
requires that this sensor be relocated to its operating
location and the tubing to the sampling tube be connected.
See “Completing Installation of Return Air Smoke
Sensor:” for details.)
Coupling
Return Air Detector module
(shipping position shown)*
Detail A
Controller module
Magnetic
test/reset
switch
Alarm
Trouble
Power
Dirty
Fig. 72 - Smoke Detector Sensor
C08209
For installations using two sensors, the duct smoke
detector does not differentiate which sensor signals an
alarm or trouble condition.
Return Air Detector Sampling Tube
*RA detector must be moved from shipping position to operating position by installer
C07307
Fig. 74 - Typical Return Air Detector Location
Smoke Detector Locations
Supply Air —
Return Air with Economizer —
The Supply Air smoke detector sensor is located to the
left of the unit’s indoor (supply) fan. See Fig. 73. Access
is through the fan access panel. There is no sampling tube
used at this location. The sampling tube inlet extends
through the side plate of the fan housing (into a high
pressure area). The controller is located on a bracket to
the right of the return filter, accessed through the lift-- off
filter panel.
The sampling tube is inserted through the side plates of
the economizer housing, placing it across the return air
opening on the unit basepan. See Fig. 75. The holes in the
sampling tube face downward, into the return air stream.
The sampling tube is connected via tubing to the return air
sensor that is mounted on a bracket high on the partition
between return filter and controller location. (This sensor
is shipped in a flat-- mounting location. Installation
requires that this sensor be relocated to its operating
location and the tubing to the sampling tube be connected.
See the following installation procedure.)
41
48TC
Duct smoke sensor
Screws
Flexible
Exhaust Tubes
Sample Tube
C08126
Return Air
Sampling Tube
Fig. 76 - Return Air Detector Shipping Position
48TC
C08129
Fig. 75 - Return Air Sampling Tube Location
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Sensor detector plate. See Fig. 76. Save the screws.
2. Remove the Return Air Sensor and its detector plate.
3. Rotate the detector plate so the sensor is facing outwards and the sampling tube connection is on the bottom. See Fig. 77.
4. Screw the sensor and detector plate into its operating
position using screws from Step 1. Make sure the
sampling tube connection is on the bottom and the exhaust tube is on the top. See Fig. 77.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
C08127
Fig. 77 - Return Air Sensor Operating Position
Additional Application Data —
Refer to Catalog No. HKRNKA-- 1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
42
Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data
NOM.
V ---Ph---Hz
208/230--- 1--- 60
IFM
TYPE
48TC**04
460--- 3--- 60
575--- 3--- 60
208/230--- 1--- 60
48TC**05
208/230--- 3--- 60
460--- 3--- 60
575--- 3--- 60
208/230--- 1--- 60
48TC**06
460--- 3--- 60
575--- 3--- 60
48TC**07
208/230--- 3--- 60
460--- 3--- 60
575--- 3--- 60
w/ P.E. (pwrd fr/ unit)
FLA
LRA
27.2
26
95
27.2
40
26
95
19.4
25
19
19.4
25
HIGH
19.7
STD
STD
MED
FLA
FLA
0.48
1.9
MED
MED
0.48
1.9
FLA
LRA
29.1
FUSE
or
HACR
BRKR
45
29
97
29.1
45
29
97
89
21.3
30
22
91
19
89
21.3
30
22
91
30
20
107
21.6
30
22
109
10.2
15
10
46
11.2
15
11
47
MCA
DISC. SIZE
MCA
DISC. SIZE
10.2
15
10
46
11.2
15
11
47
HIGH
10.7
15
11
55
11.7
15
12
56
STD
7.3
15
7
44
9.2
15
9
46
7.3
15
7
44
9.2
15
9
46
HIGH
7.4
15
7
50
9.3
15
10
52
STD
33.7
50
32
133
35.6
50
35
135
MED
MED
0.25
0.24
0.48
1.0
1.9
1.9
33.7
50
32
133
35.6
50
35
135
STD
23.5
30
23
99
25.4
30
25
101
MED
23.5
30
23
99
25.4
30
25
101
HIGH
23.8
30
23
117
25.7
30
26
119
STD
10.7
15
10
49
11.7
15
12
50
10.7
15
10
49
11.7
15
12
50
HIGH
11.2
15
11
58
12.2
15
12
59
STD
8.5
15
8
40
10.4
15
11
42
8.5
15
8
40
10.4
15
11
42
HIGH
8.6
15
9
46
10.5
15
11
48
STD
39.2
60
37
150
41.1
60
40
152
41.3
60
40
175
43.2
60
42
177
25.9
30
25
126
27.8
40
27
128
26.2
40
26
144
28.1
40
28
146
HIGH
28.5
40
28
170
30.4
45
30
172
STD
12.5
20
12
60
13.5
20
13
61
13.0
20
13
69
14.0
20
14
70
HIGH
13.8
20
14
82
14.8
20
15
83
STD
9.8
15
10
46
11.7
15
12
48
MED
9.9
15
10
52
11.8
15
12
54
HIGH
10.7
15
11
63
12.6
15
13
65
STD
30.5
45
30
157
32.4
50
32
159
MED
MED
MED
0.48
0.25
0.24
1.9
1.0
1.9
0.48
1.9
0.48
1.9
STD
208/230--- 3--- 60
NO P.E.
FUSE
or
HACR
BRKR
40
STD
208/230--- 3--- 60
NO C.O. or UNPWR C.O.
POWER
EXHAUST
MED
MED
MED
0.25
0.24
1.0
1.9
32.8
50
32
183
34.7
50
34
185
HIGH
32.8
50
32
183
34.7
50
34
185
STD
15.5
25
15
79
16.5
25
16
80
16.3
25
16
92
17.3
25
17
93
HIGH
17.3
25
17
101
18.3
25
18
102
STD
11.9
15
12
63
13.8
20
14
65
12.7
20
12
74
14.6
20
15
76
12.7
20
12
74
14.6
20
15
76
MED
MED
0.48
0.25
0.24
HIGH
1.9
1.0
1.9
See: “Legend and Notes for Table 10” on page 45.
43
48TC
UNIT
COMBUSTION
FAN MOTOR
Table 10 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
UNIT
COMBUSTION
FAN MOTOR
NOM.
V ---Ph---Hz
208/230---1---60{
IFM
TYPE
48TC**04
460--- 3--- 60
48TC
575--- 3--- 60
208/230---1---60{
48TC**05
208/230--- 3--- 60
460--- 3--- 60
575--- 3--- 60
208/230---1---60{
48TC**06
460--- 3--- 60
575--- 3--- 60
48TC**07
208/230--- 3--- 60
460--- 3--- 60
575--- 3--- 60
w/ P.E. (pwrd fr/ unit)
FLA
LRA
32.0
32
100
32.0
45
32
100
24.2
30
25
24.2
30
HIGH
24.5
STD
STD
MED
FLA
0.48
FLA
1.9
MED
MED
0.48
1.9
FLA
LRA
33.9
FUSE
or
HACR
BRKR
50
34
102
33.9
50
34
102
94
26.1
30
27
96
25
94
26.1
30
27
96
30
25
112
26.4
30
27
114
12.4
15
13
48
13.4
15
14
49
MCA
DISC. SIZE
MCA
DISC. SIZE
12.4
15
13
48
13.4
15
14
49
HIGH
12.9
15
13
57
13.9
20
14
58
STD
9.0
15
9
46
10.9
15
11
48
9.0
15
9
46
10.9
15
11
48
HIGH
9.1
15
9
52
11.0
15
12
54
STD
38.5
60
38
138
40.4
60
40
140
MED
MED
0.25
0.24
0.48
1.0
1.9
1.9
38.5
60
38
138
40.4
60
40
140
STD
28.3
40
29
104
30.2
40
31
106
MED
28.3
40
29
104
30.2
40
31
106
HIGH
28.6
40
29
122
30.5
40
31
124
STD
12.9
15
13
51
13.9
20
14
52
12.9
15
13
51
13.9
20
14
52
HIGH
13.4
15
14
60
14.4
20
15
61
STD
10.2
15
10
42
12.1
15
13
44
10.2
15
10
42
12.1
15
13
44
HIGH
10.3
15
10
48
12.2
15
13
50
STD
44.0
60
43
155
45.9
60
45
157
46.1
60
45
180
48.0
60
48
182
30.7
45
31
131
32.6
45
33
133
31.0
45
31
149
32.9
45
33
151
HIGH
33.3
45
34
175
35.2
50
36
177
STD
14.7
20
15
62
15.7
20
16
63
15.2
20
15
71
16.2
20
16
72
HIGH
16.0
20
16
84
17.0
20
17
85
STD
11.5
15
12
48
13.4
15
14
50
MED
11.6
15
12
54
13.5
15
14
56
HIGH
12.4
15
13
65
14.3
20
15
67
STD
35.3
50
35
162
37.2
50
37
164
MED
MED
MED
0.48
0.25
0.24
0.48
1.9
1.0
1.9
1.9
STD
208/230--- 3--- 60
NO P.E.
FUSE
or
HACR
BRKR
45
STD
208/230--- 3--- 60
w/ PWRD C.O.
POWER
EXHAUST
MED
MED
MED
0.48
0.25
0.24
1.9
1.0
1.9
37.6
50
38
188
39.5
50
40
190
HIGH
37.6
50
38
188
39.5
50
40
190
STD
17.7
25
18
81
18.7
25
19
82
18.5
25
19
94
19.5
25
20
95
HIGH
19.5
25
20
103
20.5
30
21
104
STD
13.6
20
13
65
15.5
20
16
67
14.4
20
14
76
16.3
20
17
78
14.4
20
14
76
16.3
20
17
78
MED
MED
0.48
0.25
0.24
HIGH
1.9
1.0
1.9
See: “Legend and Notes for Table 10” on page 45.
{ Models no longer available except for field inventory.
44
LEGEND:
BRKR
--- Circuit breaker
CO
--- Convenient outlet
DISC
--- Disconnect
FLA
--- Full load amps
IFM
--- Indoor fan motor
LRA
--- Locked rotor amps
MCA
--- Minimum circuit amps
PE
--- Power exhaust
PWRD CO
--- Powered convenient outlet
UNPWR CO
--- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit
breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to determine the percentage of voltage imbalance.
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
=
(224 + 231 + 226)
3
=
681
3
227
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
4
227
= 1.76%
% Voltage Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
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%, contact your local electric utility company immediately.
45
48TC
Legend and Notes for Table 10
48TC
Fig. 78 - EconoMi$er IV Wiring
Step 13 — Adjust Factory--Installed Options
Smoke Detectors —
Smoke detector(s) will be connected at the Controls
Connections Board, at terminals marked “Smoke
Shutdown”. Cut jumper JMP 3 when ready to energize
unit.
EconoMi$er IV Occupancy Switch —
Refer to Fig. 78 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Controls Connections 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. Cut jumper JMP 2 to complete the
installation.
Step 14 — Install Accessories
Available accessories include:
Curb
Thru-- base connection kit (must be installed before unit
is set on curb)
LP conversion kit
Flue discharge deflector
C09302
Manual outside air damper
Two-- Position motorized outside air damper
EconoMi$er IV (with control)
EconoMi$er2 (without control/for external signal)
Power Exhaust
Differential dry-- bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
CO2 sensor
DDC interface (PremierLink)
Louvered hail guard
Motormaster head pressure controls
Phase monitor control
Refer to separate installation instructions for information
on installing these accessories.
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. Download the latest versions
from HVAC Partners (www.hvacpartners.com).
46
47
48TC
48TC
Copyright 2011 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 08/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
48
Catalog No:48TC ---16SI
Replaces: 48TC--- 05SI