Carrier 50TCQD User manual

1
50TCQD
Single Package Rooftop
Heat Pump
with Puronr(R---410A) Refrigerant
Sizes 17 & 24
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
INSTALLATION 6...............................
Step 1 -- Plan for Unit Location 6..................
Step 2 -- Plan for Sequence of Unit Installation 7......
Step 3 -- Inspect Unit 7...........................
Step 4 -- Provide Unit Support 7...................
Step 5 -- Field Fabricate Ductwork 10...............
Step 6 -- Rig and Place Unit 10....................
Step 7 -- Duct Connection 11......................
Step 8 -- Install Outside Air Hood 12...............
Step 9 -- Install External Condensate Trap and Line 13.
Step 10 -- Make Electrical Connections 13...........
Step 11 -- Adjust Factory--Installed Options 42........
Step 12 -- Install Accessories 42...................
APPENDIX — TYPICAL WIRING DIAGRAMS 43...
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
safety--alert symbol . When you see this symbol on the
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.

50TCQD
2
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, always turn off main power switch to unit and
install lockout tag. Unit may have more than one
power switch.
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr(R--410A) refrigerant systems operate at
higher pressures than standard R--22 systems. Do not
use R--22 service equipment or components on Puron
refrigerant equipment.
!WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!WARNING
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.
CAUTION
!

50TCQD
3
C10135
Fig. 1 -- Unit Dimensional Drawing – Size 17 Units

50TCQD
4
C10136
Fig. 1 -- Unit Dimensional Drawing – Size 17 Unit (cont.)

50TCQD
5
C10137
Fig. 2 -- Unit Dimensional Drawing – Size 24 Unit

50TCQD
6
C10138
Fig. 2 -- Unit Dimensional Drawing – Size 24 Unit (cont.)
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installa-
tion requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for the minimum clearances
required for safety. This includes the clearance to
combustible surfaces, unit performance and service access
below, around and above unit as specified in unit
drawings. See Fig. 3.
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 or other sources of contaminated
air.
36” (914)
42” (1067)
42” (1067)
18” (457)
C09121
Fig. 3 -- 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 installation of condensate trap per
requirements.RefertoStep9—InstallExternal
Condensate Trap and Line – for required trap dimensions.
Roof mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.

50TCQD
7
Table 1 – Operating Weights
50TCQD UNITS LB (KG) UNITS LB (KG)
Component 17 24
Base Unit 2035 923) 2200 (998)
Economizer 245 (111) 245 (111)
Powered Outlet 32 (15) 32 (15)
Curb
14---in/356 mm 243 (111) 273 (124)
24---in/610 mm 315 (143) 350 (159)
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.
Curb--mounted installation —
Install curb
Install field--fabricated ductwork inside curb
Install thru--base service connection fittings (affects
curb and unit)
Rig and place unit
Remove top skid
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--mounted installation —
Prepare pad and unit supports
Rig and place unit
Remove duct covers and top skid
Install field--fabricated ductwork at unit duct openings
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.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 4 (size 17 and 20 units) and Fig. 5 (size 24 and 28
units). 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. 4 and Fig. 5. 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. 6. 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. Thru--the--base power connection must be
installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the
basepan remove knockouts in basepan located in control
box area, see Fig. 7 for location. Attach the service
connections to the basepans.
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 4 equally
spaced 4--in. x 4--in. (102 mm x 102 mm) pads on each
side. Locate pads so that they support the rails. Make sure
to avoid the fork openings.

50TCQD
8
C10139
Fig. 4 -- Roof Curb Details – Size 17 Units

50TCQD
9
C10140
Fig. 5 -- Roof Curb Details – Size 24 Units

50TCQD
10
A-B
0.25” (6)
B-C
0.5” (12)
A-C
0.5” (12)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A
B
C
C09132
Fig. 6 -- Unit Leveling Tolerances
Control Box
A
ccess Panel
Filter and
Indoor Coil
Access Panel
Indoor Blower
Access Panel
Electric Heat
Access Panel Compressor
(each side)
C09118
Fig. 7 -- Typical Access Panel and Compressor Locations
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.5 in. wg (87 Pa) with economizer or
without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
For units with accessory electric heaters, minimum clearance
is not required around ductwork. One inch (25 mm)
clearance to combustible materials must be maintained for
the first 48 inches (1220 mm) of ductwork exiting the unit.
This applies to horizontal and vertical applications.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90--degree elbow must be provided in the
ductwork to comply with UL (Underwriters Laboratories)
code for use with electric heat.
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal
injury.
For vertical supply and return units, tools or parts
could drop into ductwork and cause an injury. Install
a 90--degree turn in the return ductwork between the
unit and the conditioned space. If a 90--degree elbow
cannot be installed, then a grille of sufficient strength
and density should be installed to prevent objects
from falling into the conditioned space. Due to
electric heater, supply duct will require 90--degree
elbow.
!WARNING
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference. See Table 1 (on page 7) and Fig. 8 for additional
information.
Lifting holes are provided in base rails as shown in Fig. 8.
Refer to rigging instructions on unit.
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.
CAUTION
!
Before setting the unit onto the curb, recheck gasketing on
curb.
PositioningonCurb—
Position unit on roof curb so that the following clearances
are maintained: 1/4in. (6 mm) clearance between the roof
curb and the base rail inside the right and left, 1/2in.
(12 mm) clearance between the roof curb and the base rail
inside the front and back. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately equal to
Detail A in Figs. 4 and 5.
Do not attempt to slide unit on curb after unit is set. Doing
so will result in damage to the roof curb seal.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove rigging skids and
shipping materials.