Carrier 48TC**16 Air Conditioner User Manual

48TC**16
Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puronr (R --- 410A) Refrigerant
Size 16
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
Units with Factory-- Installed Disconnect . . . . . . . 15
TABLE OF CONTENTS
Factory-- Option Thru-- Base Connections
(Electrical Connections) . . . . . . . . . . . . . . . . . . . . 18
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 2
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . 16
Units without Thru-- Base Connections . . . . . . . . . 18
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Field Control Wiring . . . . . . . . . . . . . . . . . . . . . . . 18
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 4
Unit without Thru-- Base Connection Kit . . . . . . . 19
Roof Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Heat Anticipator Settings . . . . . . . . . . . . . . . . . . . 19
Step 2 - Plan for Sequence of Unit Installation . . . . . . 5
Humidi-- MiZerR Control Connections . . . . . . . . . . 20
Curb-- Mount Installation . . . . . . . . . . . . . . . . . . . . . 5
Humidi-- MiZer - Space RH Controller . . . . . . . . 20
Pad-- Mount Installation . . . . . . . . . . . . . . . . . . . . . . 5
PremierLinkt (Factory Option) . . . . . . . . . . . . . . . . . 21
Frame-- Mount Installation . . . . . . . . . . . . . . . . . . . . 5
Supply Air Temperature (SAT) Sensor . . . . . . . . . 25
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Outdoor Air Temperature (OAT) Sensor . . . . . . . 25
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 5
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Roof Curb Mount . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Slab Mount (Horizontal Units Only) . . . . . . . . . . . 5
Space Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Alternate Unit Support
(In Lieu of Curb or Slab Mount) . . . . . . . . . . . . . . 5
Connect Thermostat . . . . . . . . . . . . . . . . . . . . . . . 27
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . . . 7
Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . 28
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 7
Positioning on Curb . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 7 - Convert to Horizontal and Connect Ductwork . . . 8
Configure the Unit for Thermostat Mode . . . . . . 27
Indoor Air Quality (CO2 sensor) . . . . . . . . . . . . . 28
Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 28
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . . 9
Space Relative Humidity Sensor or
Humidistat Connections . . . . . . . . . . . . . . . . . . . . 29
Economizer Hood Removal and Setup —
Factory Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 30
Two Position Damper Hood Removal and Setup —
Factory Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Supply Fan Status Switch . . . . . . . . . . . . . . . . . . . 30
Economizer Hood and Two-- Position Hood . . . . . 10
Step 9 - Install Flue Hood . . . . . . . . . . . . . . . . . . . . . 10
Step 10 - Install Gas Piping . . . . . . . . . . . . . . . . . . . . 11
Factory-- Option Thru-- Base Connections
(Gas Connections) . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filter Status Switch . . . . . . . . . . . . . . . . . . . . . . . . 30
Remote Occupied Switch . . . . . . . . . . . . . . . . . . . 30
Power Exhaust (output) . . . . . . . . . . . . . . . . . . . . . 30
CCN Communication Bus . . . . . . . . . . . . . . . . . . 31
RTU Open Control System . . . . . . . . . . . . . . . . . . . . . 32
Supply Air Temperature (SAT) Sensor . . . . . . . . . 35
Step 11 - Install External Condensate Trap and Line . . 13
Outdoor Air Temperature (OAT) Sensor . . . . . . . 35
Step 12 - Make Electrical Connections . . . . . . . . . . . 14
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Field Power Supply . . . . . . . . . . . . . . . . . . . . . . . . 14
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 35
All Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Space Temperature (SPT) Sensors . . . . . . . . . . . . 36
Units without Factory-- Installed Disconnect . . . . 15
Indoor Air Quality (CO2) Sensor . . . . . . . . . . . . . 36
Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 37
!
Space Relative Humidity Senor or Humidistat . . 37
Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 38
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.
Connecting Discrete Inputs . . . . . . . . . . . . . . . . . . 38
Communication Wiring - Protocols . . . . . . . . . . . . 39
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Local Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
RTU Open Troubleshooting . . . . . . . . . . . . . . . . . 40
Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . 41
Differential Enthalpy Control . . . . . . . . . . . . . . . . 41
Return Air Enthalpy Sensor . . . . . . . . . . . . . . . . . 41
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
48TC**16
WARNING
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
!
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Sensor Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
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.
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 43
Supply Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Return Air without Economizer . . . . . . . . . . . . . . 43
Return Air with Economizer . . . . . . . . . . . . . . . . . 43
Step 13 - Adjust Factory-- Installed Options . . . . . . . . 46
Step 14 - Install Accessories . . . . . . . . . . . . . . . . . . . 46
!
SAFETY CONSIDERATIONS
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.
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.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
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.
!
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**16
Vertical Connections / Economizer
Horizontal Connections / Economizer
Fig. 1 - Unit Dimensional Drawing – 16 Size Unit
3
C10864A
48TC**16
C10862A
Fig. 1 - Unit Dimensional Drawing – 16 Size Unit (cont.)
INSTALLATION
Jobsite Survey
18”
(457) *
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.
42"
(1067)
42"
(1067)
42"
(1067)
* Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for at least 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.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof--covering material when roof curb is used
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents, relief valves, or other sources of
contaminated air.
C09897
Fig. 2 - Service Clearance Dimensional Drawing
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate
height to allow for removal and disposal of frost and ice
that will form during the heating-- defrost mode as well as
allow installation of condensate trap per requirements.
Refer to Step 11 — Install External Condensate Trap and
Line – for required trap dimensions.
4
Roof Mount —
Step 3 — Inspect Unit
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
Inspect unit for transportation damage. File any claim
with transportation agency.
Table 1 – Operating Weights
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Base Unit
UNITS LB (KG)
1380 (627)
Economizer
Vertical
100 (45)
Horizontal
115 (52)
Humidi--- MiZerR System
62 (28)
Powered Outlet
32 (15)
Curb
14--- in/356 mm
180 (82)
24--- in/610 mm
235 (107)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on 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.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 3. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
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.
IMPORTANT:
Curb-- mounted installation —
If the unit’s gas connection and/or electric and control
wiring is to be routed through the basepan and the unit
is equipped with the factory-- installed Thru-- the-- Base
service option see the following sections:
Install curb, making sure to position the common cross
rail (see Fig. 3) for large duct opening.
Install field-- fabricated ductwork inside curb
Complete installation of the factory-- installed
thru-- the-- base service connection option
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
S Factory-- Option Thru-- Base Connections
(Gas Connection) on page 11
S Factory-- Option Thru-- Base Connections
(Electrical Connections) on page 17
If using the field-- installed Thru-- the-- Base accessory
follow the instructions provided with the accessory kit.
NOTE: If gas and/or electrical connections are not
going to occur at this time, tape or otherwise cover the
fittings so that moisture does not get into the building or
conduit in the interim.
Pad-- mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field-- fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame-- mounted installation —
Frame-- mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
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.
5
48TC**16
48TC**16
COMPONENT
48TC**16
Fig. 3 - Roof Curb Details
6
C10772
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.
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
B
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
C10001
Fig. 4 - Unit Leveling Tolerances
Step 5 — Field Fabricate Ductwork
NOTE: Cabinet return-air static pressure (a negative
condition) shall not exceed 0.35 in. wg (87 Pa) with
economizer or 0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional
dimensions are equal to or greater than the unit supply
duct opening dimensions for the first 18 in. (458 mm) of
duct length from the unit basepan.
Step 6 — Rig and Place Unit
When the unit is ready to be rigged and no longer will be
lifted by a fork truck, the wood protector under the basepan
must be removed. Remove 4 screws from each base rail.
Wood protector will drop to the ground. See instructions on
the unit base rails.
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.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable 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.
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.
Before setting the unit onto the curb, recheck gasketing on
curb.
PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
914 - 1371
( 36” - 54” )
“B”
“C”
“A”
DUCT END
DETAIL “A”
SEE DETAIL “A”
C10774
UNIT
48TC**16
NOTES:
DIMENSIONS
MAX WEIGHT
A
B
C
LB
KG
IN
MM
IN
MM
IN
MM
2130
968
116.0
2945
60.5
1535
59.5
1510
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
7
48TC**16
A
Positioning on Curb —
48TC**16
For full perimeter curbs CRRFCURB074A00 and 075A00,
the clearance between the roof curb and the front and rear
base rails should be 1/4 in (6.4 mm). The clearance between
the curb and the end base rails should be 1/2 in (13 mm). For
retrofit applications with curbs CRRFCURB003A01 and
4A01, the unit should be position as shown in Fig. 6.
Maintain the 15.5 in (394 mm) and 8 5/8 in (220 mm)
clearances and allow the 22 5/16 in (567 mm) dimension to
float if necessary.
Remove all shipping materials and top skid. Remove extra
center post from the condenser end of the unit so that the
condenser end of the unit matches Figs. 26 and 27.
Recycle or dispose of all shipping materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration using accessory CRDUCTCV001A00. To
convert to horizontal configuration, remove screws from side
duct opening covers and remove covers.
Discard the supply duct cover. Install accessory
CRDUCTCV001A00 to cover the vertical supply duct
opening. Use the return duct cover removed from the end
panel to cover the vertical return duct opening.
Fig. 6 - Retrofit Installation Dimensions
C10003
If the alternative condensate drain location through the
bottom of the unit is used in conjunction with a retrofit
curb, the hole in the curb must be moved 12.5 in (320
mm) towards the duct end of the unit. (See Fig. 7.)
Original
Position
New Position
(moved 12.5 in.)
Field-- supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
C10904
Fig. 7 - Alternative Condensate Drain Hole Positions
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Fig. 8 - Horizontal Conversion Panels
IMPORTANT:
If the unit has the factory-- installed Thru-- the-- Base
option, make sure to complete installation of the option
before placing the unit on the roof curb.
See the following sections:
S Factory-- Option Thru-- Base Connections
(Gas Connection) on page 11
S Factory-- Option Thru-- Base Connections
(Electrical Connections) on page 17
NOTE: If gas and/or electrical connections are not
going to occur at this time, tape or otherwise cover the
fittings so that moisture does not get into the building or
conduit in the interim.
8
C06108
Step 8 — Install Outside Air Hood
Economizer Hood Removal and Setup Factory Option —
1. The hood is shipped in knock-- down form and
assembled to a metal support tray using plastic stretch
wrap. Located in the return air compartment, the
assembly’s metal tray is attached to the basepan and
also attached to the damper using two plastic
tie-- wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
3. Locate the (2) screws holding the metal tray to the
basepan and remove. In order to remove the screws, it
may be necessary to remove the panel underneath the
two-- position damper. Remove the two screws. Locate
and cut the (2) plastic tie-- wraps securing the
assembly to the damper. (See Fig. 11.) Be careful to
not damage any wiring or cut tie-- wraps securing any
wiring.
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 on page 10.
5. If removed, reattach the panel under the damper.
1. The hood is shipped in knock-- down form and located
in the return air compartment. It is attached to the
economizer using two plastic tie-- wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
3. Locate and cut the (2) plastic tie-- wraps, being careful
to not damage any wiring. (See Fig. 10.)
4. Carefully lift the hood assembly through the filter
access opening and assemble per the steps outlined in
Economizer Hood and Two–Position Hood on page 10.
FILTER ACCESS PANEL
Hood Parts
INDOOR COIL ACCESS PANEL
Fig. 9 - Typical Access Panel Locations
C10004
Plastic Tie Wrap
Qty (2)
Remove Hood Parts
Screws for Metal Tray
Qty (2)
Cut Plastic Ties
(2) Places
C10006
Fig. 11 - Two--Position Damper Hood Package Location
Economizer
C10005
Fig. 10 - Economizer Hood Package Location
9
48TC**16
Two Position Damper Hood Removal and Setup Factory Option —
Economizer Hood and Two-- Position Hood —
5. Attach the post that separates the filters with the
screws provided.
6. Open the filter clips which are located underneath the
hood top. Insert the aluminum filters into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filters into place. See Fig. 14.
7. Install the two rain deflectors on the edge of the hood
top as shown in Fig. 12.
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. If the panel is still attached to the unit, remove the screws along the sides and bottom of the
panel. See Fig. 12.
SIDE
PANEL
DIVIDER
OUTSIDE
AIR
48TC**16
RAIN DEFLECTORS
HOOD
CLEANABLE
ALUMINUM
FILTER
TOP
PANEL
CAULK
HERE
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
BAROMETRIC
RELIEF
C10007
TOP
PANEL
FILTER
CLIP
Fig. 14 - Economizer Filter Installation
C10009
8. Caulk the ends of the joint between the unit top panel
and the hood top as shown in Fig. 12.
9. Replace the filter access panel.
Fig. 12 - Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). Be careful not
to lift the panel too far as it might fall out. 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. 13.
FILTER
Step 9 — Install Flue Hood
The flue hood is shipped screwed to the basepan beside
the burner compartment access panel. Remove the panel
below the control box access panel to access the flue hood
shipping location. Using screws provided, install flue
hood and screen in location shown in Fig. 15.
INDOOR COIL
ACCESS PANEL
SCREW
LEFT
HOOD
SIDE
HOOD DIVIDER
Fig. 13 - Economizer Hood Construction
C10008
CONTROL BOX
ACCESS PANEL
FLUE
HOOD
3. Remove the shipping tape holding the economizer
barometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Figs. 13 and 14. Secure hood divider with 3 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
Fig. 15 - Flue Hood Details
10
C10804
Step 10 — Install Gas Piping
X
GAS
REGULATOR*
MANUAL GAS
SHUTOFF VALVE*
BASE UNIT
48” MINIMUM
DRIP LEG
PER NFGC*
BASE RAIL
MIN
MAX
48HC**14
5.0 in. wg (1250 Pa)
13.0 in. wg (3240 Pa)
!
FIELDFABRICATED
SUPPORT*
ROOF
CURB
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
11/4 or larger
6
8
10
Fig. 16 - Gas Piping Guide
C11121
Factory-- Option Thru-- Base Connections
(Gas Connection) —
This service connection kit consists of a 3/4- in NPT gas adapter
fitting (stainless steel), a 1/2- in electrical bulkhead connector
and a 11/2- in electrical bulkhead connector, connected to an
“L” bracket covering the embossed (raised) section of the unit
basepan in the condenser section. See Fig. 17.
11/2” ELECTRICAL
BULKHEAD
CONNECTOR
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT
FROM
GAS
METER
1/2” ELECTRICAL
BULKHEAD
CONNECTOR
3/4”
NPT GAS
ADAPTER
FITTING
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. 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. 16.
C10905
Fig. 17 - Thru-- the-- Base Option, Shipping Position
1. Remove the “L” bracket assembly from the unit (see
Fig. 17).
2. Cut and discard the wire tie on the gas fitting. Hand
tighten the fitting if it has loosened in transit.
3. Remove connector plate assembly from the “L”
bracket and discard the “L” bracket, but retain the
washer head screws and the gasket (located between
the “L” bracket and the connector plate assembly
NOTE: Take care not to damage the gasket, as it is
reused in the following step.
4. Place the gasket over the embossed area in the
basepan, aligning the holes in the gasket to the holes
in the basepan. See Fig. 18.
5. Install the connector plate assembly to the basepan
using 8 of the washer head screws.
11
48TC**16
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
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: 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 5 in. wg (1250 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 in.
wg (3240 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 3/4--in. FPT gas inlet port on the unit gas
valve.
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
NOTE: If gas and/or electrical connections are not going to
occur at this time, tape or otherwise cover the fittings so that
moisture does not get into the building or conduit in the
interim.
shutoff valve be located upstream of the sediment trap.
See Figs. 20 and 21 for typical piping arrangements for
gas piping that has been routed through the sidewall of the
curb. See Fig. 22 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.
CONNECTOR
PLATE
ASSEMBLY
9” (229mm) min
Thru-Curb Adapter
Union
48TC**16
GASKET
Unit Base Rail
Shut Off
Valve
C10906
Fig. 18 - Completing Installation of Thru-- the-- Base
Option
Drip
Leg
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 3/4 - in NPT street elbow (field-- supplied) on the
thru-- base gas fitting. Attach a 3/4 - 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. 19.)
C07469
Fig. 20 - Gas Piping
9” (229mm) min
Burner
Access
Panel
Union
Thru-Curb Adapter
Unit Base Rail
Drip
Leg
Shut Off
Valve
THRU-BASE
GAS FITTING
3/4-in
NPT
STREET
ELBOW
Fig. 19 - Gas Line Piping
Fig. 21 - Gas Piping
GAS
SUPPORT
BRACKET
C07470
C10806
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
Fig. 22 - Gas Piping Thru-- Base Connections
12
C10826
!
WARNING
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.
BURNER
ORIFICE
A93059
Fig. 23 - Orifice Hole
NOTE: If orifice hole appears damaged or it is suspected
to have been re-- drilled, check orifice hole with a
numbered drill bit of correct size. Never re-- drill an
orifice. A burr-- free and squarely aligned orifice hole is
essential for proper flame characteristics. See Fig. 23.
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. 24. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
CONDENSATE PAN (SIDE VIEW)
STANDARD
DRAIN PLUG
SIDE DRAIN
(FACTORY-INSTALLED)
ALTERNATE
BOTTOM DRAIN
Fig. 24 - Condensate Drain Pan (Side View)
C08021
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.
13
48TC**16
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 8 ft (2.4 m). For pipe sizes larger than
3/4-- in., follow recommendations of national codes.
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.
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).
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 25.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
BASE RAIL
OPEN
VENT
2˝ (51) MIN
TO ROOF
DRAIN
SEE NOTE
C10884
48TC**16
DRAIN PLUG
Fig. 26 - Conduit into Factory Option Disconnect
ROOF
CURB
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) trap is recommended
.
Fig. 25 - Condensate Drain Piping Details
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.).
Step 12 — Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
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.
Fig. 27 - Conduit into Control Box
C10885
If the field disconnect is larger than 100A, it must be
attached to the unit using accessory CRDISBKT001A00
— disconnect switch bracket — (see Fig. 28). Follow the
instructions provided with this accessory. For smaller field
disconnects, be sure to use 1/2” screws to mount the
disconnect directly to the end panel (see Fig. 29). In either
case, set the disconnect vertical location on the unit so
that a 90_ fitting can be used to connect the conduit to the
disconnect.
NOTE: Field-- supplied wiring shall conform with the
limitations of minimum 63_F (33_C) rise.
Field Power Supply —
For those units without through--the--curb power, conduit
must be used to route the main power from the condenser
end, via the power entry in the corner post of the unit (see
Figs. 26 and 27) to either the factory option disconnect or
the bottom of the control box. 1” conduit is provided
wrapped around compressor. A second conduit is provided
with factory installed powered convenience outlet. For those
units that require conduit larger than 1”, it must be field
supplied. Figs. 26 and 27 show the wire routings.
C10853
Fig. 28 - Mounting Position for Field Disconnects
(over 100A)
14
All Units —
All field wiring must comply with NEC and all local
requirements. Size wire based on MCA (Minimum Circuit
Amps) on the unit informative plate. See Fig. 31 and the
unit label diagram for power wiring connections to the
unit power terminal blocks and equipment ground.
Maximum wire size is 2/0 AWG per pole.
C10854
Fig. 29 - Mounting Position for Field Disconnects
(up to 100A)
Field power wires are connected to the unit at line-- side
pressure lugs at the main terminal block (TB1) or at
factory-- installed option non-- fused disconnect switch.
Max wire size is #2 AWG (copper only). (See Fig. 31.)
NOTE: TEST LEADS - Unit may be equipped with
short leads (pigtails) on the field line connection points off
the 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.
!
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 (see Note 2
on page 45) to determine the percent of voltage
imbalance.
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.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
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.
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 unit. Use only copper wire.
(See Fig. 30.)
CAUTION
NOTE: Check all factory and field electrical connections
for tightness.
Units Without Factory-- Installed Disconnect —
When installing units, provide a disconnect switch of
adequate size per NEC (National Electrical Code).
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.
ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
Units with Factory-- Installed Disconnect —
ALUMINUM
WIRE
Fig. 30 - Disconnect Switch and Unit
A93033
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.
31). The factory disconnect is an 80A disconnect.
15
48TC**16
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.
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 and
conduit requirements, 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.
Units Without Disconnect Option
TB1
11
12
13
Disconnect
per
NEC
L1
L2
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 panel beneath
the control box. See Fig. 32.
L3
208/230-3-60
460-3-60
575-3-60
Units With Disconnect Option
48TC**16
L1
2
L2
4
L3
6
1
Optional
Disconnect
Switch
Factory
Wiring
3
5
Disconnect factory test leads; discard.
Fig. 31 - Power Wiring Connections
C10015
Convenience Outlets —
!
WARNING
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; this will provide service power to the unit
when the unit disconnect switch is open. Other connection
methods will result in the convenience outlet circuit being
de-- energized when the unit disconnect switch is open. See
Fig. 34. On a unit without a unit-- mounted disconnect,
connect the source leads to the main terminal block
(TB1).
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.
If the convenience outlet transformer is connected to the
line side of a field disconnect, the conduit provided with
the unit must be used to protect the wire as they are routed
from the transformer to the field disconnect. The end of
the conduit with the straight connector attaches to the
field disconnect. The other end does not need to connect
to the transformer; however, the conduit must be routed so
that all wiring is either in the conduit or behind the access
panel.
Two types of convenience outlets are offered on the
48TC**16 : 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 panel beneath the control box.
See Fig. 32.
If the convenience outlet transformer is connected to the
line side of the factory disconnect option, route the wires
through the web bushing located on the bottom of the
disconnect box. For the load side wiring to the factory
option disconnect, route the wires through the hole on the
right side of the disconnect. Be sure to create a drip loop
at least 6” long.
Pwd-CO
Fuse
Switch
NOTICE/AVIS
Convenience Outlet Utilization
Maximum Intermittent Use 15 - Amps
Maximum Continuous Use 8 - Amps
Observe a 50% limit on the circuit
Loading above 8 - Amps
Utilisation de la prise utilitaire
Usage intermittent maximum 15 - Amps
Usage continu maximum 8 - Amps
Observez une limite de 50% sur le circuit
Chargement au-dessus de 8 - Amps 50HE501288
Convenience
Outlet
GFCI
Pwd-CO
Transformer
C10077
Fig. 33 - Convenience Outlet Utilization Notice
Disconnect
Access Panel
Fig. 32 - Convenience Outlet Location
2.0
C10361
16
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.
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.
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).
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
Mount the weatherproof cover to the backing plate as
shown in Fig. 35. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
COVER – WHILE-IN-USE
WEATHERPROOF
RECEPTACLE
NOT INCLUDED
H1
H2
Fig. 34 - Unit Powered Convenience Outlet Wiring
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T-- 15, non-- renewable screw-- in (Edison base)
type plug fuse.
!
WARNING
BASE PLATE FOR
GFCI RECEPTACLE
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Using unit-- mounted convenience outlets: Units with
unit-- mounded 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 Code Article 210, Branch Circuits,
for use of convenience outlets.
Fig. 35 - Weatherproof Cover Installation
17
C09022
48TC**16
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Factory-- Option Thru-- Base Connections
(Electrical Connections)—
This service connection kit consists of a 1/2 - in electrical
bulkhead connector and a 11/2 - in electrical bulkhead
connector, connected to an “L” bracket covering the
embossed (raised) section of the unit basepan in the
condenser section. See Fig. 36. The 1/2 - in bulkhead
connector enables the low-- voltage control wires to pass
through the basepan. The 11/2 - in electrical bulkhead
connector allows the high-- voltage power wires to pass
through the basepan.
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.
Units without Thru-- Base 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. 31.
1/2”
48TC**16
ELECTRICAL
BULKHEAD
CONNECTOR
Field Control Wiring —
11/2” ELECTRICAL
BULKHEAD
CONNECTOR
C10907
Fig. 36 - Thru-- the-- Base Option, Shipping Position
1. Remove the “L” bracket assembly from the unit.
2. Remove connector plate assembly from the “L”
bracket and discard the “L” bracket, but retain the
washer head screws and the gasket (located between
the “L” bracket and the connector plate assembly).
NOTE: Take care not to damage the gasket, as it is
reused in the following step.
3. Place the gasket over the embossed area in the
basepan, aligning the holes in the gasket to the holes
in the basepan. See Fig. 37.
4. Install the connector plate assembly to the basepan
using 8 of the washer head screws.
NOTE: If electrical connections are not going to occur at
this time, tape or otherwise cover the fittings so that
moisture does not get into the building or conduit in the
interim.
The 48TC**16 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).
Thermostat —
Install a Carrier-- approved accessory 2 stage
Cooling/Heating thermostat according to installation
instructions included with the accessory. If using an
electronic thermostat, configure it for “non-- heat pump”
operation. 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 minimum).
For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated
wire (35_C minimum). For over 75 ft. (23 m), use no. 14
AWG insulated wire (35_C 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.
CONNECTOR
PLATE
ASSEMBLY
GASKET
C10908
Fig. 37 - Completing Installation of Thru-- the-- Base
Option
18
Unit without Thru-- Base Connection Kit —
Central
Terminal
Board
Pass the thermostat control wires through the bushing on the
unit end panel. Route the wire through the snap--in wire tie
and up to the web bushing near the control box.. Route the
wire through the bushing and into the bottom left side of the
control box after removing one of the two knockouts in the
corner of the box. Use a connector at the control box to
protect the wire as it passes into the control box. Pull the
wires over to the terminal strip at the upper left corner of the
Central Terminal Board (CTB). Use the connector at the
control box and the wire tie to take up any slack in the
thermostat wire to ensure that it will not be damaged by
contact with the condenser coil. See Fig. 39.
X
C
C
G
G
W2
W2
W1
W1
O/B/Y2
Y2
(see Note)
Note:
Y1
Y1
R
R
T
H
E
R
M
O
S
T
A
T
NOTE: If thru-- the-- bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2. Do not configure for O output.
Field Wiring
C10903
Fig. 38 - Typical Low-- Voltage Control Connections
Thermostat Wire
Fig. 39 - Thermostat Wire Routing
C10886
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.
19
48TC**16
Typical
Thermostat
Connections
Humidi--MiZerR Control Connections
48TC**16
Humidi-- MiZer – Space RH Controller —
NOTE: The Humidi-- MiZer is a factory installed option.
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 bushing the unit’s louvered end panel (see
Fig. 39).
2. Route the cable through the snap-- in wire tie and up to
the web bushing near the control box.
3. Feed the cable through the bushing and into the
bottom left side of the control box after removing one
of the two knockouts in the corner of the box. Use a
connector to protect the cable as it enters the control
box.
4. Use the connector and the wire tie to reduce any slack
in the humidistat cable to ensure that it will not be
damaged by contact with the condenser coil (see Fig.
39).
5. Use wire nuts to connect humidistat cable to two
PINK leads in the low–voltage wiring as shown in
Fig. 42.
To connect the Thermidistat device (33CS2PPRH-- 01):
1. Route the Thermidistat multi-- conductor thermostat
cable (field-- supplied) through the bushing the unit’s
louvered end panel (see Fig. 39).
2. Route the cable through the snap-- in wire tie and up to
the web bushing near the control box.
3. Feed the cable through the bushing and into the
bottom left side of the control box after removing one
of the two knockouts in the corner of the box. Use a
connector to protect the cable as it enters the control
box.
4. Use the connector and the wire tie to reduce any slack
in the thermostat cable to ensure that it will not be
damaged by contact with the condenser coil (see Fig.
39).
5. The Thermidistat has dry contacts at terminals D1
and D2 for dehumidification operation (see Fig. 43).
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. 40 - Accessory Field-- Installed Humidistat
®
Fig. 41 - EDGE Pro Thermidistat
20
C09296
48TC**16
HUMIDISTAT
Fig. 42 - Typical Humidi-- MiZerR Adaptive Dehumidification System Humidistat Wiring
EDGE Pro THERMIDISTAT
C11201
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. 43 - Typical Rooftop Unit with Humidi-- MiZer Adaptive Dehumidification System
with EDGE Pro Thermidistat Device
21
C09298
48TC**16
PremierLinkt (Factory Option)
Fig. 44 - PremierLink Controller
NOTE:
Refer to Form 33CS-- 67SI for complete
PremierLink configuration, operating sequences and
troubleshooting information. Have a copy of this manual
available at unit start-- up.
The PremierLink controller (see Fig. 44) 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).)
The PremierLink control is factory-- mounted in the
48TC**16 unit’s main control box to the left of the
Central Terminal Board (CTB) (see Fig. 45). Factory
wiring is completed through harnesses connected to the
C08199
CTB. Field connections are made at a 16-- pole terminal
block (TB3) located on the bottom shelf of the unit
control box in front 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$ert2 package. (See page 34 for
accessory enthalpy controls.)
The PremierLink controller requires the use of
electronic thermostat or a CCN connection
broadcast to initiate its internal timeclock.
necessary for broadcast of time of day
(occupied/unoccupied).
a Carrier
for time
This is
functions
NOTE: PremierLink controller is shipped in Sensor mode.
To be used with a thermostat, the PremierLink controller
must be configured to Thermostat mode. Refer to
PremierLink Configuration instructions for Operating Mode.
Fig. 45 - 48HC**14 Control Box Component Locations - PremierLink Controller Location
22
C11189
48TC**16
Fig. 46 - PremierLink Wiring Schematic
23
C11202
48TC**16
Fig. 47 - PremierLink Wiring Schematic with Humidi-- MiZerR
24
C11203
Supply Air Temperature (SAT) Sensor —
NOTE: The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit’s heater surfaces.
On FIOP--equipped 48TC**16 units, the unit is supplied
with a supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6--inches (12.7
mm) in length. It is a nominal 10--k ohm thermistor.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory--mounted in the EconoMi$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 the template provided in the unit control box. Use two
field-- supplied, self-- drilling screws to secure the sensor
probe in a horizontal orientation. See Fig. 48.
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.
Field Connections
SUPPLY AIR
TEMPERATURE
SENSOR
SUPPLY AIR
RETURN AIR
Field connections for accessory sensor and input devices
are made at the 16-- pole terminal block (TB3) located
beneath the PremierLink control (see Fig. 46). 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). Route wires
to control box as indicated in Fig. 39.
ROOF
CURB
C10020
Fig. 48 - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
NOTE:
Refer to Form 33CS-- 67SI (or latest) for
complete PremierLink configuration, operating sequences
and troubleshooting information. Have a copy of this
manual available at unit set-- 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.
25
48TC**16
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**16
TB3 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
TB3 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
26
-----------
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
TB3
PL
1
J6-7
TB3
3
PL
J6-6
5
J6-5
Jumper
SET
SET
C10022
Fig. 52 - 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 TB3 as shown in Fig. 53.
CCN COM
SEN
SW1
BRN (GND)
BLU (SPT)
SENSOR WIRING
If the 48TC**16 unit is equipped with factory-- installed
smoke detector(s), disconnect the factory BLU lead at
TB3-- 6 (Y2) before connecting the thermostat. Identify the
BLU lead originating at CTB-- DDC-- 1; disconnect at
TB3-- 6 and tape off. Confirm that the second BLU lead at
TB3-- 6 remains connected to PremierLink J4-- 8.
SPACE
THERMOSTAT
C08201
Fig. 49 - T-- 55 Space Temperature Sensor Wiring
R
Connect T-- 55: See Fig. 49 for typical T-- 55 internal
connections. Connect the T-- 55 SEN terminals to TB3
terminals 1 and 3 (see Fig. 50).
CTB
THERMOSTAT
R
TB3
G
2
PL
J4-12
Y1
4
J4-10
TB3
PL
SEN
1
J6-7
Y2
6
J4-8
SEN
3
J6-6
W1
8
J4-6
W2
10
J4-4
C
C
Fig. 50 - PremierLink T-- 55 Sensor
C10023
Connect T-- 56: See Fig. 51 for T-- 56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T-- 56 terminals to TB3 terminals 1, 3
and 5 (see Fig. 52).
1
2
3
4
SEN
SW1
5
6
RED(+)
WHT(GND)
BLK(-)
CCN COM
SET
BLK
(T56)
BRN (GND)
BLU (SPT)
Fig. 53 - Space Thermostat Connections
C10283
If the 48TC**16 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. 49) 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 TB3-- 1
and TB3-- 3 per Fig. 50.
Configure the unit for Thermostat Mode —
Connect to the CCN bus using a CCN service tool and
navigate to PremierLink Configuration screen for Operating
Mode. Default setting is Sensor Mode (value 1). Change the
value to 0 to reconfigure the controller for Thermostat Mode.
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Cool
CTB
THERMOSTAT
Warm
Fig. 51 - 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).
27
48TC**16
Connect Thermostat —
Economizer Controls
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**16
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. 54 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.
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.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 54. Connect the 4-- 20 mA terminal to
terminal TB3-- 9 and connect the SIG COM terminal to
terminal TB3-- 11. See Fig. 55.
IAQ Sensor
SEN
TB3
9
PL
J5-5
COM
TB3
11
J5-3
24 VAC
Fig. 55 - Indoor CO2 Sensor (33ZCSENCO2)
Connections
C10284
Refer to Form 33CS-- 67SI, 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. 56. 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
COVER REMOVED
SIDE VIEW
Fig. 56 - Outdoor Air Quality Sensor Cover
8765432 1
J4
C08635
Fig. 54 - Indoor/Outdoor Air Quality (CO2) Sensor
(33ZCSENCO2) - Typical Wiring Diagram
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.
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. 54. Connect the 4 to 20 mA
terminal to the TB3-- 13 terminal of the 48TC**16.
Connect the SIG COM terminal to the TB3-- 11 terminal of
the 48TC**16. See Fig. 57.
28
IAQ Sensor
SEN
TB3
13
PL
J5-2
COM
TB3
11
J5-3
MOUNTING
HOLES
24 VAC
Io
Fig. 57 - Outdoor CO2 Sensor Connections
Vin
Gnd
WIRING
OPENING
Vo
C10285
Space Relative Humidity Sensor or Humidistat
Connections —
2
3
4
5
6
TB3-7
CAUTION
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. 58.
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. 59 for wiring details.
RED
BLACK
TB3-13
C11085
Fig. 59 - 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 of the jacket from the
cable. Strip 1/4 inch of insulation from each conductor. Route the cable through the wire clearance opening in the center of the sensor. See Fig. 58.
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 TB3-- 13.
5. Connect the field-- supplied BLACK wire from the
sensor to TB3-- 7.
Humidistat connections: A humidistat can not be directly
connected to the PremierLink controller. Follow the
instructions on pages 20 & 21 to connect a humidistat or a
thermostat as an electromechanical device.
29
48TC**16
C11084
Fig. 58 - Space Relative Humidity Sensor Installation
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.
!
1
!
SW2
ON
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.
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.
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 TB3-- 8. Setpoint for Supply Fan Status
is set at the switch. See Fig. 61.
Fan (Pressure) Switch (NO, close on rise in pressure)
CTB
Thermostat
On 48TC**16 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 Fig. 46,
the PremierLink wiring schematic.
R
TB3
8
C10287
Fig. 61 - PremierLink Wiring Fan Pressure Switch
Connection
48TC**16
Filter Status Switch —
This function is available only when PremierLink is
configured for (Space) Sensor Mode.
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 TB3-- 10. Setpoint for Dirty Filter is set
at the switch. See Fig. 60.
PL
J4-6
Remote Occupied Switch —
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.
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 TB3-- 2 terminal.
See Fig. 62.
Remote Occupied
LCTB
Thermostat
R
Time Clock
TB3
2
Filter Switch (NO, close on rising pressure (high drop))
CTB
Thermostat
R
PL
J4-12
C10288
TB3
10
Fig. 62 - PremierLink Wiring Remote Occupied
PL
J4-4
C10286
Fig. 60 - PremierLink Filter Switch Connection
Refer to Form 33CS-- 67SI for additional information on
configuring the PremierLink control for Door Switch
timer function.
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”.
Power Exhaust (output) —
Using Filter Timer Hours: Refer to Form 33CS-- 67SI for
instructions on using the PremierLink Configuration
screens and on unit alarm sequence.
Power Exhaust
Connect the accessory Power Exhaust contactor coils(s)
per Fig. 63.
PEC
GRA
TB3
15
TAN
CTB
THERMOSTAT
C
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.
PL
J8-3
Fig. 63 - PremierLink Power Exhaust Output
Connection
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.
30
C10289
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.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must
be connected to ground at only one single point. If the
communication bus cable exits from one building and
enters another building, the shields must be connected to
the grounds at a lightning suppressor in each building (one
point only).
Connecting CCN Bus:
NOTE: When connecting the 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
NOTE: Carrier device default is 9600 band.
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.
See Table 6 for recommended cable.
Table 6 – Recommended Cables
MANUFACTURER
CABLE PART NO.
Alpha
2413 or 5463
American
A22503
Belden
8772
Columbia
CCN BUS WIRE
COLOR
CCN PLUG PIN
NUMBER
+
Red
1
Ground
White
2
---
Black
3
Connect the CCN (+) lead (typically RED) to the unit’s
TB3-- 12 terminal. Connect the CCN (ground) lead
(typically WHT) to the unit’s TB3-- 14 terminal. Connect
the CCN (-- ) lead (typically BLK) to the unit’s TB3-- 16
terminal. See Fig. 64.
CCN Bus
+ (RED)
TB3
12
PL
J2-1
GND (WHT)
TB3
14
J2-2
– (BLK)
TB3
16
J2-3
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.
SIGNAL TYPE
Fig. 64 - PremierLink CCN Bus Connections
31
C10290
48TC**16
CCN Communication Bus —
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**16
The RTU Open control is factory-- mounted in the
48TC**16 unit’s main control box, to the left of the CTB.
See Fig. 66. 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. 65.)
Fig. 65 - RTU Open Multi-- Protocol Control Board
Fig. 66 - 48TC**16 Control Box Component Locations
32
C10811
C10810
48TC**16
Fig. 67 - RTU Open System Control Wiring Diagram
33
C11204
48TC**16
Fig. 68 - RTU Open System Control Wiring Diagram with Humidi-- MiZerR
34
C11205
Table 8 – RTU Open Controller Inputs and Outputs
Space Temp / Zone Temp
Supply Air Temperature
Outdoor Air Temperature
Space Temperature Offset Pot
Safety Chain Feedback
Compressor Safety Status
Fire Shutdown Status
Enthalpy Status
Humidistat Input Status
Indoor Air CO2
Outdoor Air CO2
Space Relative Humidity
Supply Fan Status*
Filter Status*
Door Contact Input*
Occupancy Contact*
BACnet OBJECT
NAME
TYPE OF I/O
DEDICATED INPUTS
zone_temp
AI (10K Thermistor)
sa_temp
AI (10K Thermistor)
oa_temp
AI (10K Thermistor)
stpt_adj_offset
AI (100K Potentiometer)
safety_status
DI (24 VAC)
comp_status
DI (24 VAC)
firedown_status
DI (24 VAC)
enthalpy_status
DI (24 VAC)
humstat_status
DI (24 VAC)
CONFIGURABLE INPUTS
iaq
AI (4--- 20 ma)
oaq
AI (4--- 20 ma)
space_rh
AI (4--- 20 ma)
sfan_status
DI (24 VAC)
filter_status
DI (24 VAC)
door_contact_status
DI (24 VAC)
occ_contact_status
DI (24 VAC)
CONNECTION PIN
NUMBER(S)
J20--- 1, 2
J2--- 1, 2
J2--- 3, 4
J20--- 3
J1--- 9
J1--- 2
J1--- 10
J2--- 6
J5--- 7
J4--- 2 or J4--- 5
J5--- 1 or J5--- 3 or
J5 5 or J5--- 7
OUTPUTS
Economizer Output
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat Stage 1 Relay State
Heat Stage 2 Relay State
Power Exhaust Relay State
Dehumidification Relay State
econ_output
sfan
comp_1
comp_2
heat_1
heat_2
pexh
dehum
AO (4--- 20ma)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC, 1A)
J2--- 5
J1--- 4
J1--- 8
J1--- 7
J1--- 6
J1--- 5
J11--- 3
J11--- 7, 8
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**16 unit, the unit is supplied with
a supply--air temperature (SAT) sensor (33ZCSENSAT). This
sensor is a tubular probe type, approx 6--inches (12.7 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. 48.
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
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 as shown in Fig. 39. This routing
provides the UL required clearance between high-- and
low-- voltage wiring. Connect to the wires to the
removable Phoenix connectors and then reconnect the
connectors to the board.
35
48TC**16
POINT NAME
48TC**16
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.
Field connections to T-- 55, T-- 56 and T-- 59 are provided as
examples.
S 33ZCT55SPT, space temperature sensor with override
button (T-- 55)
Connect T-- 59: The T-- 59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 71
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)
OR
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment (T-- 56)
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment (T-- 59)
Connect T-- 55: See Fig. 49 for typical T--55 internal
connections. Connect the T--55 SEN terminals to RTU Open
J20--1 and J20--2. See Fig. 69.
J20-1
SEN
J20-2
C08460
Fig. 69 - RTU Open T-- 55 Sensor Connections
Connect T-- 56: See Fig. 51 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. 70.
SEN
J20-1
SEN
J20-2
Jumper
SET
SET
SEN
OPB
COM- PWR+
J20-2
J20-3
C08461
Fig. 70 - RTU Open T-- 56 Sensor Connections
SENSOR
WIRING
J20-1
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.
SEN
SET
J20-3
POWER
WIRING
NOTE: Must use a separate isolated transformer.
C10291
Fig. 71 - 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. 54 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.
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.
36
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 54. Connect the 4-- 20 mA terminal to
RTU Open J4-- 2 and connect the SIG COM terminal to
RTU Open J4-- 3. See Fig. 72.
IAQ Sensor
4-20mA
J4-2
SIG COM
J4-3
24 VAC
Fig. 72 - RTU Open / Indoor CO2 Sensor
(33ZCSENCO2) Connections
C10738
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. 56. 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.
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. 54. Connect the 4 to 20 mA
terminal to RTU Open J4-- 5. Connect the SIG COM
terminal to RTU Open J4-- 6. See Fig. 73.
Space Relative Humidity Sensor or Humidistat —
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. 74 and 75 for typical RH sensor wiring.
S J4-- 1 or J4-- 4 = 24vdc loop power
S J4-- 2 or J4-- 5 = 4-- 20mA signal input
NOTE: The factory default for dehumidification control
is normally open humidistat.
MOUNTING
HOLES
Io
Vin
Gnd
WIRING
OPENING
Vo
OAQ Sensor/RH Sensor
J4-5
3
4
5
6
J4-6
2
ON
SIG COM
SW2
1
4-20mA
24 VAC
Fig. 73 - RTU Open / Outdoor CO2 Sensor
(33ZCSENCO2) Connections
C10739
Vin - J4-1 or J4-4 24Vdc
Io - J4-2 or J4-5 -20mA output
C11087
Fig. 74 - Space Relative Humidity Sensor Typical Wiring
37
48TC**16
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.
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**16
4-20 VAC GND 0-5V
mA or
or
VDC
0-10V
Fig. 75 - 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**16 units equipped with factory-- installed
Smoke Detector(s), the smoke detector controller
implements the unit shutdown through its NC contact set
connected to the unit’s CTB input. The FSD function is
initiated via the smoke detector’s Alarm NO contact set.
The RTU Open controller communicates the smoke
detector’s tripped status to the BAS building control. See
Fig. 67, the RTU Open System Control Wiring Diagram.
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. 65 and Fig. 67 or Fig. 68 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. 65 and Fig. 67 or Fig. 68 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. 65 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.
65 and Fig. 67 or Fig. 68 for wire terminations at J11.
38
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. 76 and 77 for
protocol switch settings and address switches. The 3rd
party connection to the RTU Open is through plug J19.
See Fig. 78 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. 76 - RTU Open SW3 Dip Switch Settings
Fig. 77 - RTU Open Address Switches
C10815
Fig. 78 - Network Wiring
39
C10816
48TC**16
SW3 Protocol Selection
Local Access —
BACview6
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. 79. 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’s J12
local access port. There are 2 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 identically to the handheld.
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**16
Handheld: The
Virtual BACview: Virtual BACview is a freeware computer
BACview6
Access Port
P1
P1
Protocol Selector
RTU Open
J12
Cable
P5
P5
BACview6 Local Access Cable
Fig. 79 - BACview6 Handheld Connections
40
C10812
Table 9 – LEDs
The LEDs on the RTU Open Control Board (see Fig. 65) 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
48TC**16
If Run LED shows...
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.
Differential Enthalpy Control —
Outdoor Air Enthalpy Control
(PNO 33CSENTHSW)
Mount the return--air enthalpy sensor (33CSENTSEN) in the
return--air section of the economizer. The return air sensor is
wired to the enthalpy controller (33CSENTHSW). See
Fig. 80.
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. 80.)
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.
Return Air Enthalpy Sensor —
24V
RED
PL6-1 (24-V)
– 4-20
Main
GND
BLK
PL6-4 (COM)
+ VDC
Out
LOW
GRA
Outside Air
Enthalpy Switch
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. 80. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
+ 24-36
VDC In
– 4-20 Main
Out
7
CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
Return Air
Enthalpy
Sensor
C11161
Fig. 80 - Outside and Return Air Enthalpy Sensor
Wiring
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
41
To wire the return air enthalpy sensor, perform the
following:
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.
Duct smoke sensor
controller
Conduit nuts
(supplied by installer)
Conduit support plate
Smoke Detectors
Terminal block cover
48TC**16
Controller housing
and electronics
Smoke detectors are available as factory--installed options on
48TC**16 units. 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.
Cover gasket
(ordering option)
Controller cover
Conduit couplings
(supplied by installer)
Fastener
(2X)
Trouble
Alarm
Power
Test/reset
switch
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 37 for details.
Fig. 81 - Controller Assembly
C08208
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.
Duct smoke sensor
Exhaust tube
Controller —
Exhaust gasket
The controller (see Fig. 81) 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,
all located on the cover face.
Sensor housing
and electronics
See
Detail A
Intake
gasket
Cover gasket
(ordering option)
TSD-CO2
(ordering option)
Sensor cover
Plug
Sampling tube
(ordered separately)
Sensor Module —
The sensor module (see Fig. 82) 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).
Coupling
Detail A
Magnetic
test/reset
switch
Alarm
Trouble
Power
Dirty
Fig. 82 - Smoke Detector Sensor Module
42
C08209
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.
For installations using two sensors, the duct smoke
detector does not differentiate which sensor signals an
alarm or trouble condition.
Smoke Detector Locations
Supply Air —
Return Air without Economizer —
The sampling tube is located across the return air opening
on the unit basepan. See Fig. 86. 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.)
Return Air with Economizer —
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. 84. 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.)
The Supply Air smoke detector sensor is located to the
left of the unit’s indoor (supply) fan. See Fig. 83. Access
is through the left side blower 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.
Flexible
Exhaust Tube
Return Air
Sampling Tube
Smoke Detector Sensor
C10330
C08245
Fig. 84 - Return Air Sampling Tube Location
Fig. 83 - Typical Supply Air Smoke Detector Sensor
Location
43
48TC**16
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
takes the appropriate action to shut down fans and
blowers, change over air handling systems, notify the fire
alarm control panel, etc.
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Sensor detector plate. See Fig. 85. 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. 86.
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. 86.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
48TC**16
Controller
Screws
Sampling Tube
C10332
Fig. 86 - Return Air Sensor Operating Position
Flexible
Exhaust
Tubes
Additional Application Data —
Refer to Catalog No. HKRNKA-- 1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
Sampling Tube
C10331
Fig. 85 - Return Air Detector Shipping Position
44
Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data
NOM.
V ---Ph---Hz
48TC*D16
208/230---3---60
460--- 3--- 60
575--- 3--- 60
IFM
TYPE
POWER
EXHAUST
NO C.O. or UNPWR C.O.
NO P.E.
w/ P.E. (pwrd fr/ unit)
STD
68.3
FUSE
or
HACR
BRKR
80
71
396
72.1
FUSE
or
HACR
BRKR
80
76
400
MED
70.8
80
74
413
74.6
90
79
417
HIGH
81.2
100
86
432
85.0
100
91
436
STD
34
45
35
234
35.8
45
37
236
35.0
45
37
243
36.8
45
39
245
HIGH
40.8
50
43
252
42.6
50
45
254
STD
26.5
30
28
184
30.3
40
32
188
26.5
30
28
184
30.3
40
32
188
32.7
40
35
196
36.5
45
39
200
MED
MED
FLA
FLA
0.48
MCA
3.8
0.25
1.8
0.24
3.8
HIGH
DISC. SIZE
FLA
LRA
MCA
DISC. SIZE
FLA
LRA
Table 10 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
UNIT
COMBUSTION
FAN MOTOR
NOM.
V ---Ph---Hz
IFM
TYPE
POWER
EXHAUST
w/ PWRD C.O.
NO P.E.
FLA
FLA
MCA
STD
48TC*D16
208/230---3---60
460--- 3--- 60
575--- 3--- 60
FUSE
or
HACR
BRKR
w/ P.E. (pwrd fr/ unit)
MCA
FUSE
or
HACR
BRKR
DISC. SIZE
FLA
LRA
DISC. SIZE
FLA
LRA
73.1
80
77
401
76.9
100
81
405
75.6
100
80
418
79.4
100
84
422
HIGH
86.0
100
92
437
89.8
100
96
441
STD
36.2
45
38
236
38
50
40
238
37.2
50
39
245
39.0
50
41
247
HIGH
43.0
50
46
254
44.8
50
48
256
STD
28.2
35
30
186
32
40
34
190
28.2
35
30
186
32
40
34
190
34.4
40
37
198
38.2
45
41
202
MED
MED
MED
0.48
0.25
0.24
3.8
1.8
3.8
HIGH
Legend and Notes for Table 10
LEGEND:
BRKR
--- Circuit breaker
CO
--- Convenience outlet
DISC
--- Disconnect
FLA
--- Full load amps
IFM
--- Indoor fan motor
LRA
--- Locked rotor amps
MCA
--- Minimum circuit amps
P.E.
--- 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.
% Voltage Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
=
(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%
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**16
UNIT
COMBUSTION
FAN MOTOR
48TC**16
Economizer
2 Position Damper
Unit Without Economizer or
2 Position Damper
Fig. 87 - EconoMi$ert IV Wiring
Step 13 — Adjust Factory--Installed Options
Barometric relief
Power Exhaust
Differential dry-- bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
Time Guard II compressor anti-- cycle control
Outdoor coil protector grille
Head pressure control
Programmable setback thermostat
Electrical/Mechanical thermostat and subbase
Thermidistatt device
Humidistat
Thermostat / Sensors
CO2 sensor
DDC interface (PremierLink)
Louvered hail guard
Phase monitor control
Smoke Detectors —
Smoke detector(s) will be connected at the Central Terminal
Board (CTB), at terminals marked “Smoke Shutdown”.
Remove jumper JMP 3 when ready to energize unit.
EconoMi$er IV Occupancy Switch —
Refer to Fig. 87 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Central Terminal Board.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY on CTB. Remove or cut jumper JMP 2 to
complete the installation.
Step 14 — Install Accessories
Available accessories include:
Roof Curb (must be installed before unit)
Thru-- base connection kit (must be installed before unit
is set on curb)
Manual outside air damper
Two-- Position motorized outside air damper
EconoMi$er IV (with control and integrated barometric
relief)
EconoMi$er2 (without control/for external signal and
integrated barometric relief)
C10333
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.
46
47
48TC**16
48TC**16
Copyright 2011 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 05/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
48
Catalog No: 48TC ---14SI
Replaces: 48TC--- 11SI