50TCQA
Single Package Rooftop
Heat Pump
with Puronr (R---410A) Refrigerant
Sizes 04 --- 07
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 4 Step 2 - Plan for Sequence of Unit Installation . . . . . . 5 Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 5 Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . . . 7 Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 7 Step 7 - Convert to Horizontal & Connect Ductwork . 8 Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . . 8 Step 9 - Install External Condensate Trap and Line . 10 Step 10 - Make Electrical Connections . . . . . . . . . . . 11 Step 11 - Adjust Factory-Installed Options . . . . . . . . 44 Step 12 - Install Accessories . . . . . . . . . . . . . . . . . . . 45
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.
50TCQA
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or death.
Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury, death and/or equipment damage.
Puronr (R-410A) 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.
!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 heat pump units.
2
50TCQA
Vertical Connections / Economizer
Horizontal Connections / Economizer
C09001
Fig. 1 - Unit Dimensional Drawing – 04 — 07 Size Units
3
50TCQA
C09002
Fig. 1 - Unit Dimensional Drawing – 04 — 07 Size 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 installation requirements.
2.Determine unit location (from project plans) or select unit location.
3.Check for possible overhead obstructions which may interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other) that provides for the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance and service access below, around and above unit as specified in unit drawings. See Fig. 2.
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.
1
18” (457)
42" (1067)
18" (457)
42" (1067)
1Required bottom condensate drain connection. Otherwise, 36” (914mm) for condensate connection.
C07459
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 durring the heating-defrost mode as well as allow installation of condensate trap per requirements. Refer to Step 9 — Install External Condensate Trap and Line – for required trap dimensions.
4
Roof mount —
Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different sequences for 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 accessory thru-base service connection package (affects curb and unit) (refer to accessory installation instructions for details)
Prepare bottom condensate drain connection to suit planned condensate line routing (refer to Step 9 for details)
Rig and place unit Install outdoor air hood
Install condensate line trap and piping Make electrical connections
Install other accessories
Pad-mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain connection plug
Rig and place unit
Convert unit to side duct connection arrangement Install field-fabricated ductwork at unit duct openings Install outdoor air hood
Install condensate line trap and piping Make electrical connections
Install other accessories
Frame-mounted installation —
Frame-mounted 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. 3. Assemble and install accessory roof curb in accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 3. Improperly applied gasket can also result in air leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are show in Fig. 4. Refer to Accessory Roof Curb Installation Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. The accessory thru-the-base power package must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the basepan, attach the accessory thru-the-base service connections to the basepan in accordance with the accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of 6 in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
Alternate Unit Support (In Lieu of Curb or Slab Mount) —
A non-combustible sleeper rail can be used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4-in. x 4-in. (102 mm x 102 mm) pads on each side.
Table 1 – Operating Weights
50TCQA |
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UNITS LB (KG) |
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Component |
A04 |
A05 |
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A06 |
A07 |
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Base Unit |
505 |
(229) |
510 |
(231) |
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590 |
(268) |
630 |
(286) |
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Economizer |
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Vertical |
80 |
(36) |
80 |
(36) |
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80 |
(36) |
80 |
(36) |
Horizontal |
105 (48) |
105 (48) |
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105 (48) |
105 (48) |
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Powered Outlet |
32 |
(15) |
32 |
(15) |
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32 |
(15) |
32 |
(15) |
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Curb |
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14---in/356 mm |
110 (50) |
110 (50) |
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110 (50) |
110 (50) |
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24---in/610 mm |
145 (66) |
145 (66) |
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145 (66) |
145 (66) |
50TCQA
5
ROOFCURB |
UNIT SIZE |
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ACCESSORY |
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1’ - 2” CRRFCURB001A02 [356]
50TCQA04-07
CRRFCURB002A02 2’ - 0” [610]
50TCQA
C08548
Fig. 3 - Roof Curb Details
6
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B |
B-C |
A-C |
0.5” (13) |
1.0” (25) |
1.0” (25) |
C06110
Fig. 4 - Unit Leveling Tolerances
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb and building structure. Do not connect ductwork to unit.
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: Horizontal applications require a minimum clearance to combustible surfaces of 1-in (25 mm) from duct for first 12-in (305 mm) away from unit. Vertical applications do not require a minimum clearance.
Minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Table 1 and Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 5. Refer to rigging instructions on unit.
!CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed for handling by fork truck.
Before setting the unit onto the curb, recheck gasketing on curb.
50TCQA
C06005
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MAX WEIGHT |
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DIMENSIONS |
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UNIT |
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A |
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B |
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C |
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LB |
KG |
IN |
MM |
IN |
MM |
IN |
MM |
50TCQA04 |
755 |
343 |
74.38 |
1889 |
36.25 |
921 |
33.38 |
848 |
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50TCQA05 |
760 |
345 |
74.38 |
1889 |
36.25 |
921 |
33.38 |
848 |
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50TCQA06 |
840 |
381 |
74.38 |
1889 |
35.63 |
905 |
41.38 |
1051 |
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50TCQA07 |
880 |
399 |
74.38 |
1889 |
37.25 |
946 |
41.38 |
1051 |
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NOTES:
1.Dimensions in ( ) are in millimeters.
2.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
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Positioning on Curb — |
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Position unit on roof curb so that the following clearances |
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are maintained: 1/4 in. (6.4 mm) clearance between the |
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roof curb and the base rail inside the front and rear, 0.0 in. |
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clearance between the roof curb and the base rail inside on |
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the duct end of the unit. This will result in the distance |
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between the roof curb and the base rail inside on the |
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condenser end of the unit being approximately equal to |
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Fig. 3, section C-C. |
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Although unit is weatherproof, guard against water from |
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higher level runoff and overhangs. |
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After unit is in position, remove the compressor access |
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panel. Holding the blocking between compressors with |
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one hand, cut the strapping. Carefully remove the |
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50TCQA |
blocking without damaging tubing, wiring, or controls. |
Remove the strapping and replace the access panel. |
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Remove all shipping materials and top skid. Recycle or |
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dispose of all shipping materials. |
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Step 7 — Convert to Horizontal and Connect |
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Ductwork (when required) |
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Unit is shipped in the vertical duct configuration. Unit |
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without factory-installed economizer or return air smoke |
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detector option may be field-converted to horizontal |
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ducted configuration. To convert to horizontal |
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configuration, remove screws from side duct opening |
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covers and remove covers. Using the same screws, install |
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covers on vertical duct openings with the insulation-side |
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down. Seals around duct openings must be tight. See |
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Fig. 6. |
C06108
Fig. 6 - Horizontal Conversion Panels
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.
Step 8 — Install Outside Air Hood
Economizer Hood Removal and Setup - Factory
Option
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. 7.)
3.Locate and cut the (2) plastic tie-wraps, being careful to not damage any wiring. (See Fig. 8.)
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
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
C06023
Fig. 7 - Typical Access Panel Locations
Remove Hood Parts
Cut Plastic Ties
(2) Places
Economizer
C08633
Fig. 8 - Economizer Wiring
8
Two Position Damper 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. 7.)
3.Locate the (2) screws holding the metal tray to the basepan and remove. Locate and cut the (2) plastic tie-wraps securing the assembly to the damper. (See Fig. 9.) 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.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C08639
Fig. 9 - Damper Assembly
50TCQA
9
Economizer Hood and Two-Position Hood —
NOTE: If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust hood assembly.
1.The indoor coil access panel will be used as the top of the hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 10.
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SIDE |
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PANEL |
50TCQA |
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TOP |
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SIDE |
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CAULK |
PANEL |
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HERE |
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INDOOR |
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INDOOR |
COIL |
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COIL |
ACCESS |
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ACCESS |
PANEL |
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PANEL |
C06025
Fig. 10 - Indoor Coil Access Panel Relocation
2.Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 11.
LEFT
HOOD
SIDE 19 1/16”B
(483mm)
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
33 3/8” |
(848mm) |
HOOD DIVIDER
C06026
Fig. 11 - Economizer Hood Construction
3.Remove the shipping tape holding the economizer barometric relief damper in place.
4.Insert the hood divider between the hood sides. See Fig. 11 and 12. Secure hood divider with 2 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.
5.Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filter into place. See Fig. 12.
DIVIDER
OUTSIDE
AIR
HOOD
CLEANABLE
ALUMINUM FILTER FILTER
BAROMETRIC RELIEF
FILTER CLIP
C08634
Fig. 12 - Economizer Filter Installation
6.Caulk the ends of the joint between the unit top panel and the hood top.
7.Replace the filter access panel.
Step 9 — 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. 13. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.
When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened with a 1/2-in. square socket drive extension.
To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a 1/2-in. square socket drive extension) and install it in the side drain connection.
CONDENSATE PAN (SIDE VIEW) |
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ALTERNATE |
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STANDARD |
DRAIN PLUG |
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BOTTOM DRAIN |
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SIDE DRAIN |
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(FACTORY-INSTALLED) |
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C08021
Fig. 13 - Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 14.
10
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
TO ROOF
DRAIN
BASE RAIL
2˝ (51) MIN
OPEN
VENT
SEE NOTE
ROOF
CURB
DRAIN PLUG
NOTE: Trap should be deep enough to offset maximum unit static difference. A 4” (102) trap is recommended.
C08022
Fig. 14 - Condensate Drain Piping Details
All units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep and protect against freeze-up. 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 10 — Make Electrical Connections
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Do not use gas piping as an electrical ground. Unit 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.
NOTE: Check all factory and field electrical connections for tightness. Field-supplied wiring shall conform with the limitations of 63_F (33_C) rise.
Field Power Supply —
If equipped with optional Powered Convenience Outlet: The power source leads to the convenience outlet’s transformer primary are not factory connected. Installer must connect these leads according to required operation of the convenience outlet. If an always-energized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de-energize via unit disconnect switch operation of the convenience outlet is desired, connect the source leads to the load side of the
unit disconnect. On a unit without a unit-mounted disconnect, connect the source leads to compressor contactor C and indoor fan contactor IFC pressure lugs with unit field power leads.
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 208-v 1/4-in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information. Field power wires will be connected line-side pressure lugs on the power terminal block or at factory-installed option
non-fused disconnect. |
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Field power wires are connected to the unit at line-side |
50TCQA |
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pressure lugs on compressor contactor C and indoor fan |
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contactor IFC or terminal board (see wiring diagram label |
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for control box component arrangement) or at |
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factory-installed option non-fused disconnect switch. |
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Max wire size is #2 AWG (copper only). (See Fig. 16) |
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NOTE: TEST LEADS - Unit may be equipped with |
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short leads (pigtails) on the field line connection points on |
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contactor C or optional disconnect switch. These leads are |
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for factory run-test purposes only; remove and discard |
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before connecting field power wires to unit connection |
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points. Make field power connections directly to line |
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connection pressure lugs only. |
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!WARNING
FIRE HAZARD
Failure to follow this warning could result in intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire.
(See Fig. 15.)
ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE
A93033
Fig. 15 - Disconnect Switch and Unit
Units Without Factory-Installed Disconnect —
When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes. Do not cover unit informative plate if mounting the disconnect on the unit cabinet.
11
50TCQA
Units with Factory-Installed Disconnect —
The factory-installed option disconnect switch is located in a weatherproof enclosure located under the main control box. The manual switch handle is accessible through an opening in the access panel. Discard the factory test leads (see Fig. 16).
Units Without Disconnect Option
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IFC |
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(3 Phase |
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C |
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Indoor Motor) |
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11 |
13 |
13 |
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(1 Phase Indoor Motor |
TB |
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and 1 Phase Unit) |
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Disconnect per NEC
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L1 |
L2 |
L3 |
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208/230-1-60 |
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208/230-3-60 |
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460-3-60 |
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575-3-60 |
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Units With Disconnect Option |
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L1 |
2 |
Optional |
1 |
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Factory |
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L2 |
4 |
Disconnect |
3 |
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Wiring |
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Switch |
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L3 |
6 |
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5 |
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Disconnect factory test leads; discard.
C09011
Fig. 16 - Power Wiring Connections
All units -
All field wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 16 and the unit label diagram for power wiring connections to the unit power terminal blocks and equipment ground. Maximum wire size is #2 ga AWG per pole.
Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes). Refer to unit informative data plate for MOCP (Maximum Over-current Protection) device size.
All field wiring must comply with the NEC and local requirements.
Convenience Outlets —
!WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Tag-out this switch, if necessary.
Two types of convenience outlets are offered on 50TCQA models: Non-powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuit-interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the end panel of the unit. See Fig. 17.
Pwd-CO
Convenience Transformer
Outlet
GFCI
Pwd-CO
Fuse
Switch
Control Box
Access Panel
C08128
Fig. 17 - Convenience Outlet Location
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.
Remove the blank cover plate at the convenience outlet; discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until approximately 1/2-in (13 mm) under screw heads are exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten).
12
Mount the weatherproof cover to the backing plate as shown in Fig. 18. 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 |
RECEPTACLE |
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WEATHERPROOF |
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NOT INCLUDED |
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BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 18 - Weatherproof Cover Installation
Non-powered type: This type requires the field installation of a general-purpose 125-volt 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.
Unit-powered type: A unit-mounted transformer is factory-installed to stepdown the main power supply voltage to the unit to 115-v at the duplex receptacle. This option also includes a manual switch with fuse, located in a utility box and mounted on a bracket behind the convenience outlet; access is through the unit’s control box access panel. See Fig. 17.
The primary leads to the convenience outlet transformer are not factory-connected. Selection of primary power source is a customer-option. If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unit-mounted non-fused disconnect or HACR breaker switch; this will provide service power to the unit when the unit disconnect switch or HACR switch is open. Other connection methods will result in the convenience outlet circuit being de-energized when the unit disconnect or HACR switch is open. See Fig. 19.
Duty Cycle: the unit-powered convenience outlet has a duty cycle limitation. The transformer is intended to provide power on an intermittent basis for service tools, lamps, etc; it is not intended to provide 15-amps loading for continuous duty loads (such as electric heaters for overnight use). Observe a 50% limit on circuit loading above 8-amps (i.e., limit loads exceeding 8-amps to 30 minutes of operation every hour).
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.
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50TCQA |
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C08283 |
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UNIT |
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TRANSFORMER |
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TERMINALS |
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L1: RED +YEL |
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L2: BLU + GRA |
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YEL |
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Fig. 19 - Powered Convenience Outlet Wiring
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.
Fuse on power type: The factory fuse is a Bussman “Fusetron” T-15, non-renewable screw-in (Edison base) type plug fuse.
Factory-Option Thru-Base Connections —
This service connection kit consists of a 1/2-in electrical bulkhead connector and a 3/4-in electrical bulkhead connector, all factory-installed in the embossed (raised) section of the unit basepan in the condenser section. The 1/2-in bulkhead connector enables the low-voltage control wires to pass through the basepan. The 3/4-in electrical bulkhead connector allows the high-voltage power wires to pass through the basepan. See Fig. 20.
Check tightness of connector lock nuts before connecting electrical conduits.
13
50TCQA
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08637
Fig. 20 - Thru-Base Connection Fittings
Field-supplied and field-installed liquidtight conduit connectors and conduit may be attached to the connectors on the basepan. Pull correctly rated high voltage and low voltage through appropriate conduits. Connect the power conduit to the internal disconnect (if unit is so equipped) or to the external 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. 16.
All Units —
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. See Table 10. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in the legend for Table 10, Note 2 (see page 44) to determine the percent of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.
Field Control Wiring —
The 50TCQA unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as factory-installed option or as field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control) or the RTU-MP Controller for Building Management Systems using non-CCN protocols (RTU-MP 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. The 50TCQ models do not require a thermostat with an O function to
control the reversing valve operation. 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.
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O |
W1 |
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Y1 |
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Note 1: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
C09012
Fig. 21 - Typical Low-Voltage Control Connections
Unit without thru-base connection kit —
Pass the thermostat control wires through the hole provided in the corner post; then feed the wires through the raceway built into the corner post to the control box. Pull the wires over to the terminal strip on the upper-left corner of the Central Terminal Board (CTB). See Fig. 22.
NOTE: If thru-the-bottom connections accessory is used, refer to the accessory installation instructions for information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second-stage heating, when available.
14
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 22 - Field Control Wiring Raceway
Electric Heaters
50TCQ units may be equipped with field-installed accessory electric heaters. The heaters are modular in design, with heater frames holding open coil resistance wires strung through ceramic insulators, line-break limit switches and a control contactor. One or two heater modules may be used in a unit.
Heater modules are installed in the compartment below the indoor (supply) fan outlet. Access is through the indoor access panel. Heater modules slide into the compartment on tracks along the bottom of the heater opening. See Fig. 23, Fig. 24 and Fig. 25.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF |
OUTDOOR |
INDOOR |
ACCESS |
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PANEL |
ACCESS PANEL |
PANEL |
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C08133 |
Fig. 23 - Typical Access Panel Location
Not all available heater modules may be used in every unit. Use only those heater modules that are UL listed for use in a specific size unit. Refer to the label on the unit cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But heaters are ordered as and shipped in cartons marked with a corresponding heater Sales Package part number. See Table 2 for correlation between heater Model Number and Sales Package part number.
NOTE: The value in position 9 of the part number differs between the sales package part number (value is 1 or 3) and a bare heater model number (value is 0).
Table 2 – Heater Model Number
Bare Heater Model Number |
C |
R |
H |
E |
A |
T |
E |
R |
0 |
0 |
1 |
A |
0 |
0 |
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Heater Sales Package PNO |
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Includes: |
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Bare Heater |
C |
R |
H |
E |
A |
T |
E |
R |
1 |
0 |
1 |
A |
0 |
0 |
Carton and packing materials |
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Installation sheet |
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50TCQA
DISCONNECT |
EMT OR RIGID CONDUIT |
SINGLE |
CENTER |
MANUAL RESET |
MOUNTING |
(FIELD-SUPPLIED) |
POINT BOX |
POST |
LIMIT SWITCH |
LOCATION |
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HEATER |
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COVERS |
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SINGLE POINT |
MAIN |
BRACKET AND |
BOX |
CONTROL CONDUIT |
MOUNTING |
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BOX |
DRIP BOOT |
SCREW |
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HEATER |
HEATER |
HEATER |
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MODULE |
MODULE |
MOUNTING |
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(LOCATION 1) |
(LOCATION 2) BRACKET |
CONTROL WIRE TERMINAL BLOCK
C08134
Fig. 24 - Typical Component Location
15