Carrier 50TC-D17, 50TC-E20, 50TC-E17, 50TC-D20, 50TC-D24 Service And Maintenance Instructions

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50TC*17- 30 Nominal 15 to 27.5 Tons With Puron ® (R-410A) Refrigerant

Service and Maintenance Instructions

TABLE OF CONTENTS

TABLE OF CONTENTS 1.........................

SAFETY CONSIDERATIONS 1....................

UNIT ARRANGEMENT AND ACCESS 3...........

SUPPLY FAN (BLOWER) SECTION 4..............

STAGED AIR VOLUME (SAV) CONTROL: 2−SPEED FAN WITH VARIABLE FREQUENCY DRIVE (VFD) 6

ADDITIONAL VFD INSTALLATION AND

TROUBLESHOOTING 7..........................

CONDENSER COIL SERVICE 8...................

EVAPORATOR COILS 10.........................

HIMIDI−MIZER DEHUMIDIFICATION SYSTEM 12

THERMOSTATIC EXPANSION VALVE (TXV) 17....

PURON (R−410A) REFRIGERANT 19.............

COOLING CHARGING CHARTS 20................

COMPRESSORS 24..............................

TROUBLESHOOTING THE COOLING SYSTEM 26..

CONVENIENCE OUTLETS 27....................

SMOKE DETECTORS 28.........................

INDICATORS 34................................

PROTECTIVE DEVICES 35.......................

PREMIERLINK™ CONTROL 36...................

RTU−OPEN CONTROL SYSTEM 38................

ECONOMI$ER SYSTEMS 40......................

PRE−START−UP/START−UP 49....................

START−UP, PREMIERLINK™ CONTROLS 50.......

START−UP, RTU−OPEN CONTROLS 51............

FASTENER TORQUE VALUES 51.................

APPENDIX I. MODEL NO. NOMENCLATURE 52...

APPENDIX II. PHYSICAL DATA 53................

APPENDIX III. FAN PERFORMANCE 61...........

APPENDIX IV. WIRING DIAGRAMS 67............

APPENDIX V. MOTORMASTER SENSOR

LOCATIONS 80.................................

UNIT START-UP CHECKLIST 81..................

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform the basic maintenance functions of replacing filters. Trained service personnel should perform all other operations.

When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Follow all safety codes. Consult local building codes and National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety−alert

symbol . When you see this symbol on the unit and in instructions or manuals, be aware of the potential for physical injury hazards.

Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety−alert symbol. DANGER identifies a hazardous situation which, if not avoided, will result in death or severe personal injury. WARNING indicates a hazardous situation which, if not avoided, could result in death or personal injury. CAUTION indicates a hazardous situation which, if not avoided, could result in minor to moderate injury or product and property damage. NOTICE is used to address practices not related to physical injury. 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.

WARNING

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in death, personal personal injury and/or property damage.

Never use air or gases containing oxygen for leak testing or for operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can lead to an explosion.

WARNING

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in death, personal personal injury and/or property damage.

Never use non−certified refrigerants in this product. Non−certified refrigerant could contain contaminant that could lead to unsafe operating conditions. Use ONLY refrigerants that conform to AHRI Standard

700.

WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal injury, death and/or equipment damage.

This system uses Puron refrigerant which has higher pressures than R−22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle Puron refrigerant. If unsure about equipment, consult the equipment manufacturer.

UNIT DAMAGE HAZARD

Failure to follow this caution can result in reduced unit performance or unit shutdown.

High velocity water from a pressure washer, garden hose, or compressed air should never be used to clean a coil. The force of the water or air jet will bend the fin edges and increase airside pressure drop.

NOTICE

OPERATIONAL TEST ALERT

Failure to follow this ALERT could result in an unnecessary evacuation of the facility.

Pressing the controller’s test/reset switch for longer than seven seconds will put the duct detector into the alarm state and activate all automatic alarm responses.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on the fan system, shut off all unit power and Lockout/Tagout the unit disconnect switch. DO NOT reach into the fan section with power still applied to the unit.

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 the convenience outlet for power status before opening the unit for service. Locate its disconnect switch, if appropriate, and open it. Lockout/Tagout this switch if necessary.

IMPORTANT: Lockout/Tagout is a term used when electrical power switches are physically locked, preventing power to the unit. A placard is placed on the power switch, alerting personnel that the power is disconnected.

UNIT ARRANGEMENT AND

ACCESS

General

Fig. 1 and Fig. 2 show general unit arrangement and access locations.

SUPPLY FAN

OUTDOOR AIR

HOOD

DISCONNECT

CONVENIENCE

OUTLET

CONTROL BOX ACCESS PANEL

HEATING SECTION

RETURN AIR FILTER AND

INDOOR COIL

ACCESS PANEL

GAS SECTION ACCESS PANEL

Fig. 1 − Access Panels and Components, Front

OUTDOOR FANS/MOTORS

COMPRESSOR

(CIRCUIT A)

CONDENSER

COIL

(CIRCUIT A)

C12560

Seasonal Maintenance

These items should be checked at the beginning of each season (or more often if local conditions and usage patterns dictate):

Air Conditioning

 Condenser fan motor mounting bolts tightness

 Compressor mounting bolts

 Condenser fan blade positioning

 Control box cleanliness and wiring condition

 Wire terminal tightness

 Refrigerant charge level

 Evaporator coil cleaning

 Evaporator blower motor amperage

Heating

 Heat exchanger flue passageways cleanliness

 Gas burner condition

 Gas manifold pressure

 Heating temperature rise

CONDENSER COIL

CIRCUIT A

CONDENSER COIL

CIRCUIT B

COMPRESSOR

CIRCUIT B

C09505

Fig. 2 − Typical Access Panel Locations, Rear

Routine Maintenance

These items should be part of a routine maintenance program, to be checked every month or two, until a specific schedule for each can be identified for this installation:

Quarterly Inspection (and 30 days after initial start)

The 50TC units should be inspected and serviced every three months.

 Return air filter replacement

 Outdoor hood inlet filters cleaned

 Belt tension checked

 Belt condition checked

 Pulley alignment checked

 Fan shaft bearing locking collar tightness checked

 Condenser coil cleanliness checked

 Condensate drain checked

Economizer or Outside Air Damper

 Inlet filters condition

 Check damper travel (economizer)

 Check gear and dampers for debris and dirt

Air Filters and Screens

Each unit is equipped with return air filters. If the unit has an economizer, it will also have an outside air screen. If a manual outside air damper is added, an inlet air screen will also be present.

Each of these filters and screens will need to be periodically replaced or cleaned.

Return Air Filters

Return air filters are disposable fiberglass media type. Access to the filters is through the small lift−out panel located on the rear side of the unit, above the evaporator/return air access panel. (See Fig. 1.)

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this CAUTION can result in premature wear and damage to equipment.

DO NOT OPERATE THE UNIT WITHOUT THE RETURN AIR FILTERS IN PLACE. Dirt and

debris on heat exchangers and coils can cause excessive current use, resulting in motor failure.

Removing the Return Air Filters

1. Remove the return air filter and indoor coil access panel. See Fig. 1.

2. Reach inside and remove filters from the filter rack.

3. Replace these filters as required with similar replacement filters of same size.

4. Re−install the return air filter and indoor coil access panel.

Outdoor Air Hood

Outside air hood inlet screens are permanent aluminum−mesh type filters. See Fig. 2. Inspect these screens for cleanliness. Remove the screens when cleaning is required. Clean by washing with hot low−pressure water and soft detergent and replace all screens before restarting the unit. Observe the flow direction arrows on the side of each filter frame.

Economizer Inlet Air Screen

This air screen is retained by spring clips under the top edge of the hood. (See Fig. 3.)

17 1/4

(438 mm)

DIVIDER

OUTSIDE

AIR

HOOD

Supply Fan Assembly

The supply fan system consists of two forward−curved centrifugal blower wheels mounted on a solid blower shaft that is supported by two greasable pillow block concentric bearings. A fixed−pitch driven fan pulley is attached to the fan shaft and an adjustable−pitch driver pulley is mounted on the motor. The pulleys are connected using a V−belt. (See Fig. 4.)

Vertical Supply Models

The two fan wheels used on the vertical supply models are the same: 15″ diameter x 15″ width. This arrangement provides uniform airflow distribution across the width of the evaporator coil, electric heater, and into the supply duct.

Horizontal Supply Models

The horizontal supply models have two different fan wheel sizes on a single shaft. The front side wheel is 18″ diameter x 15″ wide, while the rear side fan is 15″ diameter x 11″ wide. This arrangement promotes uniform airflow across the width of the evaporator coil and heater assembly while using a supply outlet on the rear side of the unit.

NOTE: This major difference in the fan system design makes it impossible to field−convert the 50TC unit’s supply fan outlet configuration.

15” X 15” SUPPLY FANS

CLEANABLE

ALUMINUM

BAROMETRIC

RELIEF

SCREEN

FILTER

CLIP

C06027

Fig. 3 − Inlet Air Screen Installation

Remove screens be removing the screws in the horizontal clips on the leading edge of the hood. Slide the filters out. See Fig. 3.

Install the filters by sliding clean or new filters into the hood side retainers. Once positioned, re−install the horizontal clips.

SUPPLY FAN (BLOWER) SECTION

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

VERTICAL SUPPLY FANS

15” X 11” SUPPLY FAN

18” X 15” SUPPLY FAN

HORIZONTAL SUPPLY FANS

C12683

Fig. 4 − Supply Fan Arrangements

Belt

Check the belt condition and tension quarterly. Inspect the belt for signs of cracking, fraying or glazing along the inside surfaces. Check belt tension by using a spring−force

tool, such as Browning’s “Belt Tension Checker” (p/n 1302546 or equivalent tool); tension should be 6−lbs at a 5/8−in. (1.6 cm) deflection when measured at the center line of the belt span. This point is at the center of the belt when measuring the distance between the motor shaft and the blower shaft.

BLOWER SHAFT

V-BELT

BLOWER 15” X 17”

MOTOR

MOTOR ADJUSTMENT BOLTS (4)

JACKBOLT LOCKING NUT (2)

MOTOR MOUNTING PLATE

JACKBOLT (2)

BLOWER 18” X 15”

C12260

Fig. 5 − Belt Drive Motor Mounting

NOTE: Without the spring−tension tool, place a straight

edge across the belt surface at the pulleys, then push down on the belt at mid−span using one finger until a 1/2−in. (1.3 cm) deflection is reached.

STRAIGHTEDGE

BROWNING BELT TENSION CHECKER

1/2”

(1.3 cm)

BELT

DEFLECTION

C12093

Fig. 6 − Checking Blower Moter Belt Tension

Adjusting the Belt Tension

Use the following steps to adjust the V−belt tension. See Fig. 4.

1. Loosen the four motor mounting nuts that attach the motor to the blower rail.

2. Loosen the two jack bolt locking nuts beneath the motor mounting plate. Turn the jack bolt locking nut counterclockwise to loosen.

3. Turn the jack bolts counterclockwise to loosen and clockwise to tighten.

4. Adjust the V−belt for proper tension.

5. Make sure the fan shaft and motor shaft are parallel before tightening the motor mount nuts. See Fig. 6.

6. Make adjustments as necessary.

7. Tighten the four motor mounting nuts.

8. Check the V−belt tension. Make adjustments as necessary.

9. Re−tighten the four motor mounting nuts.

10. Tighten both jack bolt locking nuts securely.

Replacing the V−belt

1. Use a belt with same section type or similar size. Do not substitute a “FHP” or notched type V−belt.

2. Loosen (turn counterclockwise) the motor mounting plate front bolts and rear bolts. See Fig. 4.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this CAUTION can result in premature wear and damage to equipment.

Do not use a screwdriver or pry−bar to place the new V−belt in the pulley groove. This can cause stress on the V−belt and the pulley, resulting in premature wear on the V−belt and damage to the pulley.

3. Loosen (turn counterclockwise) the jack bolt lock nuts. Loosen (turn counterclockwise) the jack bolts, relieving the belt tension and allowing easy removal of the belt by hand.

4. Remove the belt by gently lifting the old belt over one of the pulleys.

5. Install the new belt by gently sliding the belt over both pulleys, then tighten (turn clockwise) the jack bolts, sliding the motor plate away from the fan housing until proper belt tension is achieved.

6. Check the alignment of the pulleys, adjust if necessary. See Fig. 6.

7. Tighten all bolts attaching the motor to the motor plate.

8. Tighten all jack bolt jam nuts by turning clockwise.

9. Check the tension after a few hours of runtime and re−adjust as required. See Fig. 5.

Adjustable−Pitch Pulley on Motor

The motor pulley is an adjustable−pitch type that allows a servicer to implement changes in the fan wheel speed to match as−installed ductwork systems. The pulley consists of a fixed flange side that faces the motor (secured to the motor shaft) and a movable flange side that can be rotated around the fixed flange side that increases or reduces the pitch diameter of this driver pulley. (See Fig. 6.)

As the pitch diameter is changed by adjusting the position of the movable flange, the centerline on this pulley shifts laterally, along the motor shaft. This creates a requirement for a realignment of the pulleys after any adjustment of the movable flange. Also reset the belt tension after each realignment. The factory settings of the adjustable pulley is five turns open from full closed.

Check the condition of the motor pulley for signs of wear. Glazing of the belt contact surfaces and erosion on these

surfaces are signs of improper belt tension and/or belt slippage. Pulley replacement may be necessary.

Changing Fan Speed

1. Shut off the main unit power supply, and use the approved Lockout/Tagout procedures.

2. Loosen the belt by loosening the motor adjustment bolts as described in the Belt Adjustment section above.

3. Loosen the movable pulley flange setscrew. (See Fig.

6.)

4. Screw the movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. Increasing fan speed increases load on the motor. Do not exceed maximum speed specified in the Product Data or motor amperage listed on the unit rating plate..

5. Set the movable flange at the nearest keyway or flat of the pulley hub and tighten the setscrew to torque of 72 ± 5 in−lbs (8.14 ± 0.56 Nm).

Aligning the Fan and Motor Pulleys

1. Loosen the fan pulley setscrews.

2. Slide the fan pulley along the fan shaft. Make angular alignment by loosening the motor from its mounting. See Fig. 7.

3. Tighten the fan pulley setscrews and motor mounting bolts to torque specifications.

4. Recheck the belt tension. See Fig. 6.

LOCKING COLLAR

T-25 TORX SOCKET HEAD CAP SCREW

C11505

Fig. 8 − Tightening Locking Collar

STAGED AIR VOLUME (SAV) CONTROL:

2−SPEED FAN WITH VARIABLE

FREQUENCY DRIVE (VFD)

Staged Air Volume (SAV) Indoor Fan Speed System

NOTE: The SAV option is not available on units with

Humidi−MiZer adaptive humidification system.

The SAV system utilizes a Fan Speed control board and Variable Frequency Drive (VFD) to automatically adjust the indoor fan motor speed in sequence with the unit’s ventilation, cooling and heating operation. Conforming to ASHRAE 90.1 2010 Standard Section 6.4.3.10.b, during the first stage of cooling operation the SAV system will adjust the fan motor to provide two- thirds (2/3) of the design airflow rate for the unit. When the call for the second stage of cooling is required, the SAV system will allow the design airflow rate for the unit established (100%). During the heating mode, the SAV system will allow total design airflow rate (100%) operation. During ventilation mode, the SAV system will operate the fan motor at 2/3 speed.

Fig. 7 − Supply−Fan Pulley Adjustment

Bearings

This fan system uses bearings featuring concentric split locking collars. The collars are tightened through a cap screw bridging the split portion of the collar. The cap screw has a Torx T25 socket head. To tighten the locking collar: Hold the locking collar tightly against the inner race of the bearing and torque the cap screw to 65−70 in−lb (7.4−7.9 Nm). See Fig. 8.

C07075

Identifying Factory Option

This supplement only applies to units that meet the criteria detailed in Table 1. If the unit does not meet that criteria, discard this document.

Table 1 – Model−Size / VFD Option Indicator

Model / Sizes

Position in

Model Number

VDP

FIOP Indicator

50TC 17 − 30 17 G, J

See Appendix I for the Model Number Nomenclature breakdown.

Unit Installation with SAV Option

50HC Rooftop—Refer to the base unit installation instructions for standard required operating and service clearances.

NOTE: The Remote VFD Keypad is a field-installed op tion. It is not included as part of the Factory installed VFD option. See “Variable Frequency Drive (VFD) Installa tion, Setup and Troubleshooting Supplement” for wiring schematics and performance charts and configuration. See Fig. 9 for location of the (VFD) as mounted on the various 50HC models.

Variable Frequency Drive (VFD)

C11531

Fig. 9 − VFD Location for 50HC 15–27.5 Units

ADDITIONAL VFD INSTALLATION

AND TROUBLESHOOTING

Additional installation, wiring and troubleshooting infor mation for the VFD can be found in the following manu als: “Variable Frequency Drive (VFD) Installation, Setup

and Troubleshooting Supplement.”

Motor

When replacing the motor, use the following steps. See Fig. 10.

BLOWER PULLEY

V-BELT

MOTOR PULLEY

MOTOR

MOTOR MOUNTING BOLTS (4)

JACK BOLT JAM NUT (2)

JACK BOLT (2)

C12034

Fig. 10 − Replacing Belt Driven Motor

Replacing the Motor

1. Turn off all electrical power to the unit. Use approved lockout/tagout procedures on all electrical power sources.

2. Remove the cover on the motor connection box.

3. Disconnect all electrical leads to the motor.

4. Loosen the two jack bolt jamnuts on the motor

mounting bracket.

5. Turn the two jack bolts counterclockwise until the

motor assembly moves closer to the blower pulley.

6. Remove the V-belt from the blower pulley and motor

pulley.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this CAUTION can result in premature wear and damage to equipment.

7. Loosen the four mounting bracket bolts and lock

washers.

8. Remove four bolts, four flat washers, four lock wash

ers and four nuts attaching the motor mounting plate to the unit. Discard all lock washers.

9. Remove the motor and motor mounting bracket from

the unit.

10. Remove four bolts, flat washers, lock washers and

single external-tooth lock washer attaching the motor to the motor mounting plate. Discard all lock washers and external-tooth lock washer.

11. Lift the motor from the motor mounting plate and set

aside.

12. Slide the motor mounting band from the old motor.

13. Slide the motor mounting band onto the new motor

and set the motor onto the motor mounting plate.

14. Remove the variable pitch pulley from the old motor

and attach it to the new motor.

15. Inspect the variable pitch pulley for cracks and wear.

Replace the pulley if necessary.

16. Secure the pulley to the motor by tightening the pul

ley setscrew to the motor shaft.

17. Insert four bolts and flat washers through the mount

ing holes on the motor and into holes on the motor mounting plate.

18. On one bolt, place a new external-tooth lock washer

between the motor and motor mounting band.

19. Make sure the teeth of the external-tooth lock washer

make contact with the painted base of the motor. This washer is essential for properly grounding the motor.

20. Install four new lock washers and four nuts on the

bolts on the bottom of the motor mounting plate, but do not tighten the mounting bolts at this time.

21. Set the new motor and motor mounting bracket back

onto the unit. See Fig. 10.

22. Install four bolts, four flat washers, four new lock

washers and four nuts attaching the motor assembly to the unit, but do not tighten the mounting bolts at this time.

23. Install the motor drive V-belt to the motor pulley and

blower wheel pulley. See CAUTION.

24. Align the motor pulley and blower wheel pulley using

a straight edge. See Fig. 7.

25. Adjust the V-belt tension using the adjustment tool.

26. Turn the two jack bolts clockwise, moving the motor

assembly away from the blower pulley, increasing the V-belt tension.

27. Tighten the four bolts securing the motor mounting brackets to the unit. Torque bolts to 120 ± 12 in-lbs (14 ± 1.4 Nm).

28. Remove the cover on the motor connection box.

29. Re-connect all electrical leads to the motor and re

place the connection box cover.

30. Re-connect all electrical power to the unit. Remove lockout tags on all electrical power sources.

31. Start the unit and allow to run for a designated period.

32. Shut off the unit and make any necessary adjustments

to the V-belt tension or the motor and blower wheel pulley alignment.

STRAIGHTEDGE

BROWNING BELT TENSION CHECKER

1/2”

(1.3 cm)

BELT

DEFLECTION

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this CAUTION can result in equipment damage.

Drive packages cannot be changed in the field. For example: a standard drive cannot be changed to a high static drive. This type of change will alter the unit’s certification and could require heavier wiring to support the higher amperage draw of the drive package.

To reduce vibration, replace the motor’s adjustable pitch pulley with a fixed pitch pulley (after the final airflow balance adjustment). This will reduce the amount of vibration generated by the motor/belt-drive system.

To determine variable pitch pulley diameter, perform the following calculation:

1. Determine full open and full closed pulley diameter.

2. Subtract the full open diameter from the full closed

diameter.

3. Divide that number by the number of pulley turns

open from full closed This number is the change in pitch datum per turn open.

EXAMPLE:

– Pulley dimensions 2.9 to 3.9 (full close to full open) – 3.9 - 2.9 = 1 – 1 divided by 5 (turns from full close to full open) – 0.2 change in pulley diameter per turn open – 2.9 + 0.2 = 3.1″ pulley diameter when pulley closed

one turn from full open

CONDENSER COIL SERVICE

C12093

Fig. 11 − Adjusting V−belt Tension

Changing Fan Wheel Speed by Changing Pulleys

The horsepower rating of the belt is primarily dictated by the pitch diameter of the smaller pulley in the drive system (typically the motor pulley in these units). Do not install a replacement motor pulley with a smaller pitch diameter than provided on the original factory pulley. Change fan wheel speed by changing the fixed fan pulley (larger pitch diameter to reduce wheel speed, smaller pitch diameter to increase wheel speed) or select a new system with both pulleys and matching belt(s).

Before changing pulleys to increase fan wheel speed, check the fan performance at the target speed and airflow rate to determine new motor loading (bhp). Use the fan performance tables or use the Packaged Rooftop Builder software program. Confirm that the motor in this unit is capable of operating at the new operating condition. Fan shaft loading increases dramatically as wheel speed is increased.

ROUND TUBE PLATE FIN (RTPF) CONDENSER COIL

The condenser coil is fabricated with round tube copper hairpins and plate fins of various materials and/or coatings (see the Model Number Nomenclature in Appendix 1 to identify the materials provided in this unit). The coil may be one−row or composite−type two−row. Composite two−row coils are two single−row coils fabricated with a single return bend end tubesheet.

Recommended Condenser Coil Maintenance and Cleaning

Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities to extend the life of the coil.

Remove Surface Loaded Fibers

Two −Row Coils

Surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non−metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges can be easily bent over and damage to the coating of a protected coil) if the tool is applied across the fins.

NOTE: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low−velocity clean water rinse.

Periodic Clean Water Rinse

A periodic clean water rinse is very beneficial for coils that are applied in coastal or industrial environments. However, it is very important that the water rinse is made with a very low−velocity water stream to avoid damaging the fin edges. Monthly cleaning as described below is recommended.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this CAUTION can result in reduced unit performance or unit shutdown.

Use only the recommended approved cleaning procedures for proper system performance.

Clean coil as follows:

1. Turn off unit power and tag the disconnect.

2. Remove the top panel screws on the condenser end of the unit.

3. Remove the condenser coil corner post. See Fig. 12.

4. Lift and hold the top cover open.

5. Hold the top pan open by placing the coil corner post between the top panel and center post. See Fig. 13.

C08205

Fig. 12 − Cleaning Condenser Coil

Routine Cleaning of Coil Surfaces

Periodic cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement Components Division as p/n: P902- 0301 for one-gallon

(3.8L) container, and P902- 0305 for a 5-gallon (18.9L) container. It is recommended that all coils, including

standard aluminum, pre−coated, copper/copper or E−coated coils be cleaned with the Totaline environmentally sound coil cleaner as described below. Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure long life of the coil. Failure to clean the coils may result in reduced durability in the environment.

Avoid use of:

 coil brighteners

 acid cleaning prior to painting

 high pressure washers

 poor quality water for cleaning

Totaline environmentally sound coil cleaner is a nonflammable, hypo allergenic, non bacterial, USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation. Use of non−recommended coil cleaners is strongly discouraged since coil and unit durability could be affected.

C08206

Fig. 13 − Propping Up Top Panel

6. Remove the screws securing the coil to the compressor plate and compressor access panel.

7. Remove the fasteners holding the coil sections together at the return end of the condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 14.

C08207

Fig. 14 − Separating Coil Sections

8. Clean the outer surfaces with a stiff brush in the normal manner. Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris.

9. Secure the inner and outer coil rows together with a field−supplied fastener.

10. Reposition the outer coil section and remove the coil corner post from between the top panel and center post. Reinstall the coil corner post and access panel.

11. Replace all screws.

EVAPORATOR COILS

The evaporator coil uses the traditional round-tube, plate-fin (RTPF) technology. Tube and fin construction consists of various optional materials and coatings (see APPENDIX I. MODEL NUMBER NOMENCLATURE). Coils are multiple-row. On two-compressor units, the evaporator coil is a face split design, meaning the two refrigerant circuits are independent in the coil. The bottom portion of the coil will always be circuit A, with the top of the coil being circuit B.

Coil Maintenance and Cleaning Recommendation

Removing Surface Loaded Fibers

Surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non- metallic bristle brush can be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged. Applying the tool across the fin edges can cause the edges to be easily bent over, damaging the coating of a protected coil.

NOTE: Use of a water stream, such as a garden hose, against a surface-loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface-loaded fibers must be completely removed prior to using a low-velocity clean water rinse. A vacuum cleaner or a soft- bristled brush should be used to remove surface-loaded fibers and dirt.

and p/n: P902- 0305 for a 5-gallon (18.9L) container). It is recommended that all round tube coils be cleaned as described below. Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure a long life for the coil. Failure to clean the coils can result in reduced durability in the environment. When cleaning the coils, avoid use of the following:

 coil brighteners

 acid cleaning prior to painting

 high pressure washers

 poor quality water for cleaning

TotalineR Environmentally Sound Coil Cleaner Application Equipment

 2−1/2 gallon garden sprayer

 Water rinse with low velocity spray nozzle

WARNING

PERSONAL INJURY HAZARD

Failure to follow this WARNING can result in severe personal injury and reduced unit performance.

High−velocity water from a pressure washer, garden hose, or compressed air should never be used to clean a coil. The force of the water or air jet will bend the fin edges and increase airside pressure drop.

High−velocity water from a pressure washer can cause severe injury upon contact with exposed body tissue. Always direct the water stream away from the body.

Totaline Environmentally Sound Coil Cleaner Application Instructions

1. Proper protection such as safety glasses, gloves and protective clothing are recommended during mixing and application.

Periodic Clean Water Rinse

A periodic clean-water rinse is very beneficial for coils that are used in coastal or industrial environments. However, it is very important that the water rinse is made with a very low-velocity water stream to avoid damage to the fin edges. Monthly cleaning, as described below, is recommended.

Routine Cleaning of Evaporator Coil Surfaces

Monthly cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of the coils. This cleaner is available from Carrier Replacement Parts Division (p/n: P902- 0301 for one-gallon (3.8L) container,

CAUTION

EQUIPMENT HAZARD

Failure to follow this CAUTION can result in corrosion and damage to the unit.

Harsh chemicals, household bleach or acid or basic cleaners should not be used to clean outdoor or indoor coils of any kind. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion at the fin/tube interface where dissimilar materials are in contact. If there is dirt below the surface of the coil, use the Totaline environmentally sound coil cleaner.

2. Remove all surface loaded fibers and dirt with a vacuum cleaner as described above.

3. Thoroughly wet finned surfaces with clean water and a low velocity garden hose, being careful not to bend fins.

4. Mix Totaline environmentally sound coil cleaner in a 2−1/2 gallon (9.6 L) garden sprayer according to the instructions included with the cleaner. The optimum solution temperature is 100F (38C).

NOTE: Do NOT USE water in excess of 130F (54C), as the enzymatic activity will be destroyed.

5. Thoroughly apply Totaline environmentally sound coil cleaner solution to all coil surfaces, including finned area, tube sheets and coil headers.

6. Hold the garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up−and−down motion.

7. Avoid spraying in a horizontal pattern to minimize potential for fin damage.

8. Make sure the cleaner thoroughly penetrates deep into the finned areas.

9. Interior and exterior finned areas must be thoroughly cleaned.

10. Finned surfaces should remain wet with cleaning solution for 10 minutes.

11. Make sure surfaces are not allowed to dry before rinsing. Reapply cleaner as needed to ensure 10−minute saturation is achieved.

12. Thoroughly rinse all surfaces with low−velocity clean water using a downward rinsing motion of the spray nozzle. Protect fins from damage from the spray nozzle.

Evaporator Coil Metering Devices

The metering devices are multiple fixed−bore devices (Acutrol) swedged into the horizontal outlet tubes from

the liquid header, located at the entrance to each evaporator coil circuit path. These are non−adjustable. Service requires replacing the entire liquid header assembly.

To check for possible blockage of one or more of these metering devices, disconnect the supply fan contactor (IFC) coil, then start the compressor and observe the frosting pattern on the face of the evaporator coil. A frost pattern should develop uniformly across the face of the coil starting at each horizontal header tube. Failure to develop frost at an outlet tube can indicate a plugged or a missing orifice.

Refrigerant System Pressure Access Ports

There are two access ports in the system − on the suction tube near the compressor and on the discharge tube near the compressor. These are brass fittings with black plastic caps. The hose connection fittings are standard 1/4 SAE male flare couplings.

The brass fittings are two−piece High Flow valves, with a receptacle base brazed to the tubing and an integral spring−closed check valve core screwed into the base (See Fig. 15). This schrader valve is permanently assembled into this core body and cannot be serviced separately; replace the entire core body if necessary. Service tools are available from RCD (p/n P920−0010) that allow the replacement of the schrader valve core without having to recover the entire system refrigerant charge. Apply compressor refrigerant oil to the schrader valve core’s bottom o−ring. Install the fitting body with 96 ± 10 in−lbs (10.85 ± 1.13 Nm) of torque; do not overtighten.

NOTE: The High−Flow valve has a black plastic cap with a rubber o−ring located inside the cap. This rubber o−ring must be in place in the cap to prevent refrigerant leaks.

EXAMPLE:

Model 50TC*D28

Circuit A (from Fig. 15)

Outdoor Temperature 85F (29C)..................

Suction Pressure 125 psig (860 kPa).................

C08453

Fig. 15 − CoreMax Access Port Assembly

Suction Temperature should be 63F (17C)..........

Circuit B (from Fig. 15)

Outdoor Temperature 85F (29C)..................

Suction Pressure 120 psig (830 kPa).................

Suction Temperature should be 58F (14C)..........

HIMIDI−MIZERR ADAPTIVE

DEHUMIDIFICATION SYSTEM

Units with the factory−equipped Humidi−MiZer option are capable of providing multiple modes of improved dehumidification as a variation of the normal cooling cycle. See Fig 16. The design of the Humidi−MiZer system allows for two humidity control modes of operation of the rooftop unit, utilizing a common subcooling/reheat dehumidification coil located downstream of the standard evaporator coil. This allows the rooftop unit to operate in both a dehumidification (Subcooling) mode and a hot gas (Reheat) mode for maximum system flexibility. The Humidi−MiZer package is factory−installed and will operate whenever there is a dehumidification requirement present.

The Humidi−MiZer system is initiated based on an input from a discrete input from a mechanical space or return air humidistat.

Humidi−MiZerR Modes

Normal Cooling for Units A17 − A30

During the Normal Cooling mode, the liquid refrigerant flows from the outdoor condenser through the normally open (NO) Cooling System Valve (CSV) to the expansion device. Both the Reheat1 (RH1.x) and Reheat2 (RH2) valves are closed during the normal cooling mode.

During the Normal Cooling mode, the refrigerant flows from the outdoor compressor through the condenser coil. The Reheat2 (RH2.x) is closed, preventing the refrigerant from bypassing the condenser coil. The refrigerant then flows through the open Reheat2 (RH1.x) 3−way valve to the TXV Metering Device, bypassing the Humidi− MiZer coil, and finally passing through the evaporator coil before returning to the outdoor compressor. See Fig

16.

Reheat1 (Subcooling Mode) for Units A17 − A30

Th Reheat1 or Subcooling mode will be engaged to satisfy part−load−type conditions when there is a space call for cooling and dehumidification. Although the temperature could have dropped and decreased the sensible load in the space, the outdoor and/or space humidity levels could have risen. A typical scenario could be when the outside air is 85F (29C) with 70% to 80% relative humidity (RH). Desired Sensible Heat Ratio (SHR) for equipment in this scenario is typically from 0.4 to 0.7. The Humidi−MiZer unit will initiate the Dehumidification mode when both the space temperature and humidity are above the temperature and humidity setpoints while attempting to meet both setpoint requirements.

Once the humidity requirement is met, the unit can continue to operate in normal cooling mode to meet any remaining sensible capacity load. Alternatively, if the sensible load is met and humidity levels remain high the unit can switch to Hot Gas Reheat mode or Reheat2 mode to provide neutral, dehumidified air.

During the Reheat1 or Subcooling mode, the liquid refrigerant flows from the outdoor compressor through the condenser coil to the Reheat1 (RH1.x) 3−way valve and on to the Humid−Mizer coil. The Reheat2 (RH2.x) valve is closed. The liquid refrigerant then passes through the Humid−Mizer coil and then a metering device or Thermostatic Expansion Valve (TXV). From the TXV, the liquid refrigerant passes through the evaporator coil and back to the outdoor comprssor. See Fig 17.

Reheat2 (Hot Gas Reheat Mode) for A17 − A30

This Reheat2 or Hot Gas Reheat mode is used when dehumidification is required without a need for cooling, such as when the outside air is at a neutral temperature, but high humidity exists. This situation requires the equipment to operate at a low SHR of 0.0 to 0.2. With no cooling requirement calling for dehumidification, the Humidi− MiZer adaptive dehumidification system will energize both compressors, opening the two hot gas bypass valves, allowing refrigerant flow to the Humidi−MiZer coil to reheat the unit’s supply air to a neutral temperature.

The hot bypassed refrigerant liquid (gas or two−phase mixture) exits the outdoor compressor and passes through the open Reheat1 (RH1.x) at the same time it passes through the condenser coil to the open Reheat2 (Rh2.x) to the Humidi−MiZer coil. After the refrigerant passes through the Humidi−MiZer coil, it enters a TXV metering device, decreasing the air pressure, and on to the evaporator coil. The refrigerant is subcooled in this coil to a temperature approaching the evaporator leaving air temperature. The liquid refrigerant then returns to the outdoor compressor. See Fig. 18.

The refrigerant enters the TXV and evaporator coil at a temperature lower than the temperature in the standard cooling operation. This lower temperature increases the latent capacity of the evaporator. The refrigerant passes through the evaporator turning it into a superheated vapor. The air passing over the evaporator coil becomes colder than it would during normal operation. As this same air passes over the Humidi−MiZer Reheat Coil, it will be warmed to the neutral supply air temperature.

Humidi−MiZerR System Components

The Humidi−MiZer System uses the standard unit compressor(s), evaporator coil and Round Tube−Plate Fin (RTPF) condenser coil. Additional refrigeration system hardware includes a subcooler/reheat coil and control solenoid valves. On some models, the evaporator coil includes a TXV as a standard feature. Units with Humidi−MiZer FIOP also include a factory−installed head pressure control system (Motormaster I) to provide proper liquid pressure during reheat modes. Unique system controls include a reheat relay mode, and evaporator coil freezestat, and secondary low pressure switch.

Operating Sequences

The Humidi−−MiZer system provides three sub−modes of operation: Normal Cooling, Reheat1 and Reheat2.

The Reheat1 and Reheat2 modes are available when the unit is not in a heating mode and when the Low Ambient Lockout Switch is closed.

When there is both cooling demand (thermostat Y1 demand) and dehumidification demand, circuit 1 will operate in Subcooling (Reheat1) mode. See Fig. 17 Schematic for system refrigerant flow.

When there is only a single cooling demand, one or both circuits will operate in Hot Gas (Reheat2) mode. The DSV

RH2.x

VALV E

RH1.x

VALV E

N/A

CONDENSER COIL

OUTDOOR AIR

solenoid valve is open ahd eht CSV solenoid is closed. See Fig. 18 schematic for system refrigerant flow.

Subcooler/Reheat Coil

The Subcooler/Reheat Coil is mounted across the leaving face of the unit’s evaporator coil. The coil is a one−row design with two separate circuits.

HUMIDI-MIZER COIL

COMPRESSOR

= CLOSED VALVE

= OPEN VALVE

= 3-WAY VALVE

Fig. 16 − Normal Cooling Mode – Humidi−MiZerR System

RH2.x

VALV E

CONDENSER COIL

OUTDOOR AIR

COMPRESSOR

RH1.x

VALV E

EVAPORATOR COIL

INDOOR AIR

HUMIDI-MIZER COIL

EVAPORATOR COIL

TXV

VALV E

C07122A

TXV

VALV E

= CLOSED VALVE

= OPEN VALVE

= 3-WAY VALVE

Fig. 17 − Subcooling Mode (Reheat 1) – Humidi−MiZerR System

INDOOR AIR

C07123A

RH2.x

VALV E

CONDENSER COIL

OUTDOOR AIR

RH1.x VALV E

HUMIDI-MIZER COIL

COMPRESSOR

EVAPORATOR COIL

= CLOSED VALVE

= OPEN VALVE

= 3-WAY VALVE

INDOOR AIR

Fig. 18 − Hot Gas Reheat Mode (Reheat 2) – Humidi−MiZerR System

Table 2 – Humidi−MiZerR Reheat Control Board I/O

Point Name Type

Connection Pin Number

Unit

Connection

Humidistat/LTLO DI, 24VAC J1A - 1 (1) LT LO

Thermostat W1 DI, 24VAC J1A - 2 (2) CTB - REHEAT - 4

Econ Y1 DI, 24VAC J1A - 6 (6) CTB - REHEAT - 5

Thermostat G DI, 24VAC J1B - 1 (7) CTB - REHEAT - 1 24V Power (J1) 24VAC J1B - 3 (9) CTB - R 24V Power (J2) 24 VAC J2 - 1 CTB - R

Econ Y2 DI, 24VAC J1B - 5 (11) CTB - REHEAT - 7 2 - circ only

COMP1 DO, 24VAC J1A - 5 (5) CTB - HEAT - 6

IFM DO, 24VAC J1B - 4 (8) CTB - REHEAT - 2

COMP2 DO, 24VAC J1B - 4 (10) CTB - REHEAT - 8

LSV DO, 24VAC J2 - 2 FTP (BLK)

DSV1 DO, 24VAC J2 - 3 DSV

NOT LSV DO, 24VAC J2 - 4 2 - circ only

DSV2 DO, 24VAC J2 - 5 2 - circ only

TXV

VALV E

C07124A

Note

LEGEND

COMP — Compressor CTB — Control Terminal Board DI — Discrete Input (switch) DO — Discrete Output (switch) DSV — Discharge (gas) Solenoid Valve ECON — Economizer FPT — Freeze Protection Thermostat IFM — Indoor (supply) Fan Motor LSV — Liquid Solenoid Valve LTLO — Low Temperature Lockout REHEAT — Connection Strip REHEAT (on CTB)

Table 3 – Inputs/Modes/Outputs Summary

HUM

Y1 Y2 W1 G

OFF OFF OFF ON OFF Normal Fan OFF OFF ON=G OFF OFF ON=R OFF OFF

ON OFF OFF On OFF Normal Cool1 ON=Y1OFF ON=G OFF OFF ON=R OFF OFF

ON ON OFF ON OFF Normal Cool2 0N=Y2 ON ON=G OFF OFF ON=R OFF OFF OFF OFF ON X OFF Normal Heat 1 OFF OFF ON=G OFF OFF ON=R OFF OFF OFF OFF OFF ON ON Reheat Dehumidify ON ON ON=G ON ON OFF ON=R ON=R

ON OFF OFF ON ON Subcool

ON ON OFF ON ON Subcool

OFF OFF ON X ON Heat Over-

OFF OFF ON

/ LT

X ON Heat Over-

MODE

Cir1/ Reheat

Cir2

Cir1 and

Cir2

ride

Cool1 and Cool2 /

Subcool-Dehumidify

Cool1 and Cool2 /

Subcool-Dehumidify

Heat 1 OFF OFF ON=G OFF OFF ON=R OFF OFF

Heat 1 and 2 OFF OFF ON=G OFF OFF ON=R OFF OFF

COMP1COMP

ON ON ON=G ON ON OFF OFF ON=R

ON ON ON=G ON ON OFF OFF OFF

IFM

LSV

LSV2

LSV

NOT

DSV1 DSV2

Table 4 – Humidi−MiZerR Troubleshooting

PROBLEM CAUSE REMEDY

General cooling mode problem See Cooling Service Troubleshooting (Table 4).

Subcooling Reheat Mode Will Not Activate

Hot Gas Reheat Mode Will Not Activate

No Dehumidification Demand

CRC Relay Operation

RLV, CLV or LDV Valve Operation

RDV Valve Operation (NOTE: Normally Closed When De-energized)

Low Latent Capacity in Subcool ing or Hot Gas Reheat Modes

Low Sensible Capacity in Normal Cool or Subcooling Reheat Modes

Low Suction Pressure and High Superheat During Normal Cool Mode

Low Suction Pressure and High Discharge Pressure

RDV Valve Cycling On/Off Hot Gas Reheat mode low suction pressure limit

Circuit B Will Not Operate With Circuit A Off

LEGEND

CRC — Cooling/Reheat Control CLV — Cooling Liquid Valve RLV — Reheat Liquid Valve RH — Relative Humidity RDV — Reheat Discharge Valve

No dehumidification demand See No Dehumidification Demand, below.

CRC relay operation See CRC Relay Operation, below.

Circuit RLV, CLV or LDV valve problem See CLV, RLV or LDV Valve Operation, below.

General cooling mode problem See Cooling Service Troubleshooting (Table 4).

No dehumidification demand See No Dehumidification Demand, below.

CRC relay operation See CRC Relay Operation, below.

Circuit RLV, CLV or LDV valve problem See CLV, RLV or LDV Valve Operation, below.

Circuit RDV valve is not open See RDV Valve Operation, below.

Outdoor temperature too low

Relative humidity setpoint too low — Humidistat Check/reduce setting on accessory humidistat.

Relative humidity setpoint too low — RH sensor

Software configuration error for accessory humidistat

Software configuration error for accessory humidity sensor

No humidity signal Check wiring. Check humidistat or humidity sensor.

No 24V signal to input terminals

No power to output terminals Check wiring.

Relay outputs do not change state Replace faulty relay.

No 24V signal to input terminals

Solenoid coil burnout

Stuck valve Replace valve. Replace filter drier.

No 24V signal to input terminals

Solenoid coil burnout

Stuck valve Replace valve. Replace filter drier.

CLV valve open or leaking See CLV Valve Operation, above.

RDV valve open or leaking See RDV Valve Operation, above.

General cooling mode problem See Cooling Service Troubleshooting (Table 4).

RDV valve open or leaking See RDV Valve Operation, above.

General cooling mode problem See Cooling Service Troubleshooting (Table 4).

Both RLV and CLV valves closed See RLV and CLV Valve Operation, above.

Normal operation. Motormaster outdoor fan control requires operation of circuit A.

Check Reheat 2 Circuit Limit Temperatures (Configuration → HMZR → RA.LO and RB.LO) using ComfortLink Scrolling Marquee.

Check Space RH Setpoints (Setpoints → RH.SP and RH.UN) and occupancy using ComfortLink Scrolling Marquee.

Check Space Humidity Switch (Configuration UNIT RH.SW) using ComfortLink Scrolling Marquee.

Check RH Sensor on OAQ Input (Configuration → UNIT → RH.S) using ComfortLink Scrolling Marquee.

Check using Cool→Reheat1 Valve Test (Service Test → HMZR → CRC) using ComfortLink Scrolling Marquee.

Check MBB relay output.

Check wiring.

Check transformer and circuit breaker.

Check using Cool→Reheat1 Valve Test (Service Test → HMZR → CRC) using ComfortLink Scrolling Marquee.

Check CRC Relay Operation.

Check Wiring.

Check transformer and circuit beaker or fuses.

Check continuous over-voltage is less than 10%.

Check under-voltage is less than 15%.

Check for missing coil assembly parts.

Check for damaged valve enclosing tube.

Check using Cool→Reheat1 Valve Test (Service Test → HMZR → RHV.A or RHV.B) using ComfortLink Scrolling Marquee.

Check MBB relay output.

Check wiring.

Check transformer and circuit breaker or fuses.

Check continuous over-voltage is less than 10%.

Check under-voltage is less than 15%.

Check for missing coil assembly parts.

Check for damaged valve enclosing tube.

Normal Operation During Mixed Circuit Subcooling and Hot Gas Reheat ModesatLowerOutdoorTemperatures.

None

THERMOSTATIC EXPANSION

VALVE (TXV)

All two−stage 50TC units with Humidi−Mizer have a factory installed nonadjustable thermostatic expansion valve (TXV). The TXV will be a bi-flow, bleed port expansion valve with an external equalizer. TXVs are specifically designed to operate with Puron or R-22 refrigerant, use only factory authorized TXVs. See Fig.

20.

TXV Operation

The TXV is a metering device that is used in air conditioning and heat pump systems to adjust to changing load conditions by maintaining a preset superheat temperature at the outlet of the evaporator coil.

The volume of refrigerant metered through the valve seat is dependent upon the following:

1. Superheat temperature is sensed by the cap tube sensing bulb on suction the tube at the outlet of evaporator coil. This temperature is converted into pressure by refrigerant in the bulb pushing downward on the diaphragm which opens the valve using the push rods.

2. The suction pressure at the outlet of the evaporator coil is transferred through the external equalizer tube to the underside of the diaphragm.

3. The needle valve on the pin carrier is spring loaded, exerting pressure on the underside of the diaphragm. Therefore, the bulb pressure equals the evaporator pressure (at the outlet of the coil) plus the spring pressure. If the evaporator load increases, the temperature increases at the bulb, which increases the pressure on the topside of the diaphragm, pushing the carrier away from the seat, opening the valve and increasing the flow of refrigerant. The increased refrigerant flow causes increased leaving evaporator pressure which is transferred through the equalizer tube to the underside of the diaphragm. This causes the pin carrier spring pressure to close the TXV valve. The refrigerant flow is effectively stabilized to the load demand with a negligible change in superheat.

Replacing TXV

CAUTION

PERSONAL INJURY HAZARD

Failure to follow this CAUTION can result in injury to personnel and damage to components.

Always wear approved safety glasses, work gloves, and other recommended Personal Protective Equipment (PPE) when working with refrigerants.

1. Disconnect all AC power to the unit. Use approved lockout/tagout procedures.

2. Using the gauge set approved for use with Puron (R− 410A) refrigerant, recover all refrigerant from the system.

3. Remove the TXV support clamp.

4. Disconnect the liquid line at the TXV inlet.

5. Remove the liquid line connection at the TXV inlet.

6. Remove the equalizer tube from the suction line of the coil. Use a tubing cutter to cut the brazed equalizer line approximately 2 inches (50 mm) above the suction tube.

7. Remove the bulb from the vapor tube above the evaporator coil header outlet.

8. Install the new TXV; avoid damage to the tubing or the valve when attaching the TXV to the distributor. Protect the TXV against over−temperature conditions by using wet rags and directing the torch flame tip away from the TXV body. Connect the liquid line to the TXV inlet by repeating the above process.

9. Attach the equalizer tube to the suction line. If the replacement TXV has a flare nut on its equalizer line, use a tubing cutter to remove the mechanical flare nut from the equalizer. Then use a coupling to braze the equalizer line to the stub (previous equalizer line) in the suction line.

10. Attach the TXV bulb in the same location as the original (in the sensing bulb indent), wrap the bulb in protective insulation and secure using the supplied bulb clamp. See Figs. 19 and 21.

EQUALIZER TUBE FROM TXV VALVE

15.9 mm (REF)

C10372

DIRECTION OF REFRIGERANT FLOW

TXV SENSOR BULB

SENSOR BULB

INDENT

SENSOR BULB

INSULATION

CAPILLARY TUBE

TO TXV

Fig. 19 − TXV Sensor Valve Insulation

11. Route the equalizer tube through the suction connection opening (large hole) in the fitting panel and install the fitting panel in place.

12. Sweat the inlet of the TXV marked “IN” to the liquid line. Avoid excessive heat which could damage the valve.

13. Check for leaks.

14. Evacuate the system completely and then recharge.

15. Remove the lockout/tagout on the main power switch

and restore power to the unit.

16. Complete the charging procedure.

Refrigerant System Pressure Access Ports

There are two access ports in the system: on the suction tube near the compressor, and on the discharge tube near the compressor. These are brass fittings with black plastic caps. The hose connection fittings are standard 1/4 SAE male flare couplings. See Fig. 15.

The brass fittings are two-piece High Flow valves, with a receptacle base brazed to the tubing and an integral spring-closed check valve core screwed into the base. This check valve is permanently assembled into this core body

and cannot be serviced separately; replace the entire core body if necessary. Service tools are available from RCD that allow the replacement of the check valve core without having to recover the entire system refrigerant charge.

DIAPHRAGM

PUSHRODS

FEEDER TUBES

INLET

OUTLET

NEEDLE VALVE

SPRING

DISTRIBUTOR

Apply compressor refrigerant oil to the check valve core’s bottom o-ring. Install the fitting body with 96 ±10 in-lbs of torque; do not over- tighten.

CAPILLARY TUBE

COIL

BULB

TXV SENSOR

BULBS

CIRCUIT 2

EXTERNAL EQUALIZER TUBE

C150325

Fig. 20 − Thermostatic Expansion Valve (TXV) Operation

CLAMP

TXV SENSOR BULB

TXV

SENSOR

BULBS

TXV (CIRCUIT 1)

Fig. 21 − TXV Sensor Bulb Locations

TXV (CIRCUIT 2)

CIRCUIT 1

C12557

PURONR (R−410A) REFRIGERANT

This unit is designed for use with Puron (R−410A) refrigerant. Do not use any other refrigerant in this system.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this CAUTION can result in damage to components.

The compressor is in a Puron (R−410A) refrigerant system and uses a polyester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Avoid exposure of POE oil to the atmosphere. Exposure to the atmosphere can cause contaminants that are harmful to R−410A components to form. Keep POE oil containers closed until ready for use.

Puron (R−410A) refrigerant is provided in pink (rose) colored cylinders. These cylinders are available with and without dip tubes; cylinders with dip tubes will have a label indicating this feature. For a cylinder with a dip tube, place the cylinder in the upright position (access valve at the top) when removing liquid refrigerant for charging. For a cylinder without a dip tube, invert the cylinder, with theaccess valve located on the bottom, when adding liquid refrigerant.

Because Puron (R−410A) refrigerant is a blend, it is strongly recommended that refrigerant always be removed from the cylinder as a liquid. Admit liquid refrigerant into the system in the discharge line when breaking the refrigerant system vacuum while the compresor is OFF. Only add refrigerant (liquid) into the suction line while the compressor is operating. If adding refrigerant into the suction line, use a commercial metering/expansion device at the gauge manifold; remove liquid from the cylinder, pass it through the metering device at the gauge set, and then pass it into the suction line as a vapor. Do not remove Puron (R−410A) refrigerant from the cylinder as a vapor.

specified amount of refrigerant as listed on the unit's rating plate.

Low−Charge Cooling

Using the Cooling Charging Charts (Figs. 23 thru 30), vary the refrigerant until the conditions of the appropriate chart are met. Note the charging charts are different from the type normally used. These charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gauge and temperature sensing devices are required. Connect the pressure gauge to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate it so the outdoor ambient temperature does not affect the reading. Indoor-air cfm must be within the normal operating range of the unit.

SIZE DESIGNATION NOMINAL TON REFERENCE

17 15 20 17.5 24 20 28 25

EXAMPLE:

Model 50TC*D28

Circuit A

Outdoor Temperature 85F (29C)..................

Suction Pressure 125 psig (860 kPa).................

Suction Temperature should be 63F (17C)..........

Circuit B

Outdoor Temperature 85F (29C)..................

Suction Pressure 120 psig (830 kPa).................

Suction Temperature should be 58F (14C)..........

Using the Cooling Charging Charts

Take the outdoor ambient temperature and read the suction pressure gauge. Refer to the chart to determine what the suction temperature should be. If the suction temperature is high, add refrigerant.

Refrigerant Charge

Unit panels must be in place when the unit is operating during the charging procedure. To prepare the unit for charge adjustment:

No Charge

Use standard evacuating techniques. Evacuate the system down to 500 microns and let set for 10 minutes to determine if the system has a refrigerant leak. If the evacuation level raises to 1100 microns and stabilizes, then the system has moisture in it and should be dehydrated as GTAC2-5 recommends.

If the system continues to rise above 1100 microns, then the system has a leak and should be pressurized and leak tested using appropriate techniques as explained in GTAC2-5. After evacuating the system, weigh in the

If the suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as the charge is adjusted.

Select the appropriate unit charging chart from Figs. 22 thru 29.

Note the outdoor ambient temperature and read the suction pressure gauge. Refer to the chart to determine what the suction temperature should be. If the suction temperature is high, add refrigerant. If the suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as the charge is adjusted.

For 17–28 sizes, perform this procedure once for Circuit A (using the Circuit A chart) and once for Circuit B (using the Circuit B chart).

COOLING CHARGING CHARTS

COOLING CHARGING CHART

17.5 Ton - Circuit A

185.0

175.0

165.0

155.0

145.0

135.0

125.0

115.0

Suction Pressure (psig)

105.0

95.0

85.0

75.0 °

F 35 40 45 50 55 60 65 70 75 80 85 90 95 100

C 1.7 4.4 7.2 10.0 12.8 15.6 18.3 21.1 23.9 26.7 29.4 32.2 35.0 37.8

Suction Temperature

Fig. 22 − Cooling Charging Chart − 15 Ton (Circuit A)

115F / 46.1C 105F / 40.6C

95F / 35.0C 85F / 29.4C 75F / 23.9C 65F / 18.3C 55F / 12.8C 45F / 7.2C

50HE501045-C

C12227

COOLING CHARGING CHART

17.5 Ton - Circuit B

185.0

175.0

165.0

155.0

145.0

135.0

125.0

115.0

Suction Pressure (psig)

105.0

95.0

85.0

75.0 °

F 35 40 45 50 55 60 65 70 75 80 85 90 95 100

C 1.7 4.4 7.2 10.0 12.8 15.6 18.3 21.1 23.9 26.7 29.4 32.2 35.0 37.8

Suction Temperature

115F / 46.1C 105F / 40.6C

50HE501046-C

Fig. 23 − Cooling Charging Chart − 15 Ton (Circuit B)

95F / 35.0C 85F / 29.4C 75F / 23.9C 65F / 18.3C 55F / 12.8C 45F / 7.2C

12228

COOLING CHARGING CHARTS (cont.)

COOLING CHARGING CHART

20 Ton - Circuit A

185.0

175.0

165.0

155.0

145.0

135.0

125.0

115.0

Suction Pressure (psig)

105.0

95.0

85.0

75.0 °

F 35 40 45 50 55 60 65 70 75 80 85 90 95 100

C 1.7 4.4 7.2 10.0 12.8 15.6 18.3 21.1 23.9 26.7 29.4 32.2 35.0 37.8

Suction Temperature

Fig. 24 − Cooling Charging Chart − 17.5 Ton (Circuit A)

115F / 46.1C 105F / 40.6C

50HE501089-C

95F / 35.0C 85F / 29.4C 75F / 23.9C 65F / 18.3C 55F / 12.8C 45F / 7.2C

C12229

Fig. 25 − Cooling Charging Chart − 17.5 Ton (Circuit B)

C12230A

COOLING CHARGING CHARTS (cont.)

Fig. 26 − Cooling Charging Chart − 20 Ton (Circuit A)

C12231A

Fig. 27 − Cooling Charging Chart − 20 Ton (Circuit B)

C12232A

Fig. 28 − Cooling Charging Chart − 25 Ton (Circuit A)

C12233A

Fig. 29 − Cooling Charging Chart − 25 Ton (Circuit B)

C12234A

COMPRESSORS

Lubrication

The compressor is charged with the correct amount of oil at the factory.

WARNING

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in death, personal personal injury and/or property damage.

Never use air or gases containing oxygen for leak testing or for operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can lead to an explosion.

WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this WARNING can result in personal injury or death.

Use a gauge set certified for use with Puron (R−410A) refrigerant to relieve presure 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

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in death, personal personal injury and/or property damage.

700.

Replacing the Compressor

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in damage to components.

The compressor is in a Puron refrigerant system and uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Avoid exposure of the oil to the atmosphere.

NOTE: Only factory−trained service technicians should remove and replace compressor units.

Compressor Mounting Bolts: Compressor mounting bolts should be periodically inspected for proper tightness. Bolts should be tightened and have the torque set at 65−75 in−lb (7.3 − 8.5 Nm).

Compressor Rotation

On 3−phase units with scroll compressors, it is important to be certain the compressor is rotating in the proper direction. To determine whether or not the compressor is rotating in the proper direction:

1. Connect service gauges to suction and discharge pressure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start−up.

NOTE: If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

4. Note that the evaporator fan is probably also rotating in the wrong direction.

5. Turn off power to the unit. Use applicable lockout/ tagout procedures.

6. Reverse any two of the unit power leads.

7. Reapply power to the compressor.

The suction and discharge pressure levels should now move to their normal start−up levels.

NOTE: When the compressor is rotating in the wrong direction, the unit makes an elevated level of noise and does not provide cooling.

Filter Drier

Replace the Filter Drier whenever the refrigerant system is exposed to atmosphere. Only use factory specified liquid−line filter driers with working pressures no less than 650 psig (4482 kPa). Do not install a suction−line filter drier in liquid line. A liquid−line filter drier designed for use with Puron refrigerant is required on every unit.

The compressor using Puron refrigerant contains a POE oil. This oil has a high affinity for moisture. Do not remove the compressor’s tube plugs until ready to insert the unit suction and discharge tube line ends.

Replacing the Filter Drier

Use the following steps to replace the Filter Drier.

1. Using a Puron (R410) gauge set, recover all refrig

erant from the system.

2. Use a tubing cutter to remove the filter drier from the

line.

NOTE: Do Not use a torch to remove the old filter drier. The heat from the torch will allow contaminants into the air and into the open refrigeration system.

3. Sweat a new replacement filter drier into the refriger

ant line.

4. Re-charge the refrigerant system.

Adjusting the Condenser−Fan

1. Shut off the unit power supply. Apply the appropriate lockout/tagout procedures.

2. Remove the condenser−fan assembly (grille, motor, and fan).

3. Loosen the fan hub setscrews.

4. Adjust the fan height as shown in Fig. 30.

5. Tighten the setscrews.

6. Replace the condenser−fan assembly.

C10323

Fig. 30 − Condenser Fan Adjustment

TROUBLESHOOTING THE COOLING SYSTEM

Refer to Table 5 for additional troubleshooting topics.

Table 5 – Cooling Service Troubleshooting

PROBLEM CAUSE REMEDY

Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker.

Compressor and Con denser Fan Will Not Start.

Compressor Will Not Start But Condenser Fan Runs.

Compressor Cycles (other than normally satisfying thermostat).

Compressor Operates Continuously.

Excessive Head Pressure.

Head Pressure Too Low.

Excessive Suction Pressure.

Suction Pressure Too Low.

Evaporator Fan Will Not Shut Off.

Compressor Makes Excessive Noise.

Defective thermostat, contactor, transformer, or control relay.

Insufficient line voltage. Determine cause and correct. Incorrect or faulty wiring. Check wiring diagram and rewire correctly. Thermostat setting too high. Lower thermostat setting below room temperature. Faulty wiring or loose connections in compres

sor circuit. Compressor motor burned out, seized, or

internal overload open. Defective run/start capacitor, overload, start

relay. One leg of three-phase power dead. Replace fuse or reset circuit breaker. Determine cause.

Refrigerant overcharge or undercharge.

Defective compressor. Replace defective compressor. Insufficient line voltage. Determine cause and correct. Blocked condenser. Determine cause and correct. Defective run/start capacitor, overload, or start

relay. Defective thermostat. Replace thermostat. Faulty condenser-fan motor or capacitor. Replace. Defective fan motor or capacitor. Restriction in refrigerant system. Locate restriction and remove. Dirty air filter. Replace filter. Unit undersized for load. Decrease load or replace with larger unit. Thermostat set too low. Reset thermostat. Low refrigerant charge. Locate leak; repair and recharge. Leaking valves in compressor. Replace compressor. Air in system. Recover refrigerant, evacuate system, and recharge. Condenser coil dirty or restricted. Clean coil or remove restriction. Dirty air filter. Replace air filter. Dirty condenser coil. Clean condenser coil. Refrigerant overcharged. Recover excess refrigerant.

Faulty TXV valve.

Air in system. Recover refrigerant, evacuate system, and recharge. Condenser air restricted or air short-cycling. Determine cause and correct. Low refrigerant charge. Check for leaks; repair and recharge. Compressor valves leaking. Replace compressor. Restriction in liquid tube. Remove restriction. High head load. Check for source and eliminate. Compressor valves leaking. Replace compressor. Refrigerant overcharged. Recover excess refrigerant. Dirty air filter. Replace filter. Low refrigerant charge. Check for leaks; repair and recharge. Metering device or low side restricted. Remove source of restriction.

Faulty TXV valve.

Insufficient evaporator airflow.

Temperature too low in conditioned area. Reset thermostat. Outdoor ambient below 25°F. Install low-ambient kit.

Time off delay not finished. Wait for 30-second off delay.

Compressor rotating in wrong direction. Reverse the 3-phase power leads.

Replace defective component.

Check wiring and repair or replace. Tighten loose connec tions.

Determine cause. Replace compressor.

Determine cause and replace defective component.

Recover refrigerant, evacuate system, and recharge to values on nameplate.

Determine cause and replace.

1. Check TXV bulb mounting and secure tightly to suction line and insulate.

2. Replace TXV valve and filter drier if stuck open or closed.

1. Check TXV bulb mounting and secure tightly to suction line and insulate.

2. Replace TXV valve and filter drier if stuck open or closed.

Increase air quantity. Check filter and replace if necessary. Check belt tension on blower.

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 50HC models: Non−powered and unit−powered. Both types provide a 125−volt Ground−Fault Circuit−Interrupter (GFCI) duplex receptacle rated at 15A behind a hinged waterproof access cover, located on the end panel of the unit. See Fig. 32.

Non−Powered Type

This type requires the field installation of a general−purpose 125−volt 15A 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 125V power supply conductors into the bottom of the utility box containing the duplex receptacle.

Pwd-CO

Convenience

Outlet

GFCI

Transformer

C10324

Fig. 32 − Powered Convenience Outlet Wiring

Pwd-CO

Fuse

Switch

Control Box

Access Panel

C08128

Fig. 31 − Convenience Outlet Location

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. 33.

UNIT

VOLTAGE

208,

230

460 480

575 600

CONNECT

240

PRIMARY

CONNECTIONS

L1: RED +YEL L2: BLU + GRA

L1: RED Splice BLU + YEL L2: GRA

L1: RED L2: GRA

TRANSFORMER

TERMINALS

H1 + H3 H2 + H4

H2 + H3

H1 H2

Wet in Use Convenience Outlet Cover

The unit has a “wet in use” convenience outlet cover that must be installed on the panel containing the convenience outlet. This cover provides protection against moisture entering the GFCI receptacle. This cover is placed in the unit control box during shipment.

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).

The primary leads to the convenience outlet transformer

TOP

WET L

ATION

WET L

OCATION S

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 a unit−mounted non−fused disconnect or circuit breaker switch; this will provide service power to the unit when the unit disconnect switch or circuit breaker is open. Other connection methods will result in the convenience outlet circuit being de−energized when the unit disconnect or circuit breaker is open. See Fig. 32.

GFCI Maintenance

Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle.

1. Press the TEST button on the face of the receptacle. This should cause the internal circuit of the receptacle to trip and open the receptacle.

2. Check for proper grounding and power line phasing should the GFCI receptacle fail to trip.

3. Repair ground wire connections as needed and correct the line phasing.

4. Press RESET button to clear the tripped condition.

Fuse On Powered Type

The factory fuse is a Bussman “Fusetron” T−15, non−renewable screw−in (Edison base) type plug fuse.

Using Unit−Mounted Convenience Outlets

Units with unit−mounted convenience outlet circuits will often require that two disconnects be opened to de−energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de−energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets. Always use a volt meter to verify no voltage is present at the GFCI receptacles before working on the unit.

Installing a 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 to its depth. The cover must be installed at the unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

GFCI RECEPTACLE

COVER - WHILE-IN-USE

WEATHERPROOF

BASEPLATE FOR

GFCI RECEPTACLE

NOT INCLUDED

GASKET

C09022

Fig. 33 − Weatherproof Cover Installation

1. Remove the blank cover plate at the convenience outlet. Discard the blank cover.

2. Loosen the two screws at the GFCI duplex outlet until approximately 1/2−in (13 mm) under the screw heads is exposed.

3. 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.

4. Mount the weatherproof cover to the backing plate as shown in Fig. 33.

5. Remove two slot fillers in the bottom of the cover to allow service tool cords to exit the cover.

6. Check the cover installation to confirm full closing and latching.

SMOKE DETECTORS

Smoke detectors are available as factory−installed options on 50TC models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer or in combination of Supply Air and Return Air. 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.

The weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, backing plate and gasket.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Before performing service or maintenance operations on the convenience outlets, Lockout/Tagout all electrical power to the unit.

System

The smoke detector system consists of a four−wire controller (HT28TZ001) and one or two sensors (HT50TZ001). 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.

Controller

The controller (see Fig. 34) 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: Power, Trouble and Alarm. A manual test/reset button is located on the cover face.

from a fire, causes the sensor to signal an alarm state but dust and debris accumulated over time does not.

Duct Smoke Sensor

Controller

Conduit Nuts (supplied by installer)

Controller Housing

and Electronics

Conduit Couplings

(supplied by installer)

Alarm

Fastener

(2X)

Cover Gasket

(ordering option)

Conduit Support Plate

Terminal Block Cover

Trouble Power

Test/Reset Switch

Controller Cover

C08208

Fig. 34 − Controller Assembly

Sensor

The sensor (see Fig. 35) 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: Power, Trouble, Alarm and Dirty. A manual test/reset button is located on the left side of the housing.

Air is introduced to the duct smoke detector sensor’s sensing chamber through a sampling tube that extends into the HVAC duct and is directed back into the ventilation system through a (shorter) exhaust tube. The difference in air pressure between the two tubes pulls the sampled air through the sensing chamber. When a sufficient amount of smoke is detected in the sensing chamber, the sensor signals an alarm state and the controller automatically takes the appropriate action to shut down fans and blowers, change over air handling systems, notify the fire alarm control panel, etc.

Duct Smoke Sensor

Exhaust Tube

Exhaust Gasket

Sensor Housing

Alarm

Tro ubl e

and Electronics

Power Dirty

Cover Gasket (ordering option)

Sensor Cover

C08209

See Detail A

Intake

Gasket

(ordering option)

Plug

Detail A

TSD-CO2

Sampling Tube (ordered separately)

Coupling

Magnetic

Test/Reset

Switch

Fig. 35 − Smoke Detector Sensor

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

The Supply Air smoke detector sensor is located to the left of the unit’s indoor (supply) fan. See Fig. 36. Access is through the fan access panel. There is no sampling tube used at this location. The sampling tube inlet extends through the side plate of the fan housing (into a high pressure area). The controller is located on a bracket to the right of the return filter, accessed through the lift−off filter panel.

SUPPLY AIR

SMOKE

DETECTOR

SENSOR

The sensor uses a photoelectric (light scattering principle) process called differential sensing to prevent gradual environmental changes from triggering false alarms. A rapid change in environmental conditions, such as smoke

C10325

Fig. 36 − Typical Supply Air Smoke Detector Sensor

Location

Return Air without Economizer

FIOP Smoke Detector Wiring and Response

The sampling tube is located across the return air opening on the unit basepan. See Fig. 37. The holes in the sampling tube face downward, into the return air stream. The sampling tube is attached to the control module bushing that extends from the control box through the partition into the return air section of the unit. The sensor tube is shipped mounted to the Indoor Blower Housing and must be relocated to the return air section of the unit. Installation requires that this sensing tube be attached to the control module bushing. See installation steps.

RETURN AIR DETECTOR MODULE (Shipping position shown)*

CONTROLLER MODULE

RETURN AIR DETECTOR SAMPLING TUBE

*RA detector must be moved from shipping

position to operating position by installer

C07307

Fig. 37 − Typical Return Air Detector Location

Return Air with Economizer

All units: The FIOP smoke detector is configured to

automatically shut down all unit operations when a smoke condition is detected. See Fig. 39, Smoke Detector Wiring.

Highlight A: The JMP 3 is factory−cut, transferring unit control to the smoke detector.

Highlight B: The smoke detector NC contact set will open on a smoke alarm condition, de−energizing the ORN conductor.

Highlight C: 24V power signal using the ORN lead is removed at the Smoke Detector input on the Central Terminal board (CTB); all unit operations cease immediately.

PremierLinkt and RTU−−Open Controls: Unit operating functions (fan, cooling and heating) are terminated as described above. In addition:

Highlight D: On smoke alarm condition, the smoke detector NO Alarm contact will close, supplying 24V power to the GRA conductor.

Highlight E: The GRA lead at the Smoke Alarm input on LCTB provides a 24V signal to the FIOP DDC control.

PremierLink: This signal is conveyed to PremierLink FIOP’s TB1 at terminal TB1−6 (BLU lead). This signal initiates the FSD sequence by the PremierLink control. FSD status is reported to the connected CCN network.

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. 38. The holes in the sampling tube face downward, into the return air stream. The sampling tube is connected through tubing to the return air sensor that is mounted on a bracket high on the partition between return filter and controller location. The Return Air 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 installation steps.

RTU−OPEN: The 24V signal is conveyed to the RTU −OPEN J1−10 input terminal. This signal initiates the FSD sequence by the RTU−OPEN control. FSD status is reported to the connected BAS network.

Using Remote Logic: Five field−use conductors are provided for additional annunciation functions.

Additional Application Data: Refer to Catalog number HKRNKA−1XA for discussions on additional control features of these smoke detectors, including multiple unit coordination. See Fig. 39.

RETURN AIR SENSOR

(Operating Position Shown)

CONTROLLER MODULE

SCREWS (2)

SAMPLE TUBE

Fig. 38 − Return Air Sampling Tube Location in Unit with Economizer

C12050

Fig. 39 − Typical Smoke Detector System Wiring

48TM502525 D

C12559

Sensor and Controller Tests

Sensor Alarm Test

The sensor alarm test checks a sensor’s ability to signal an alarm state. This test requires that you use a field provided SD−MAG test magnet.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

This test places the duct detector into the alarm state. Unless part of the test, disconnect all auxiliary equipment from the controller before performing the test. If the duct detector is connected to a fire alarm system, notify the proper authorities before performing the test.

Sensor Alarm Test Procedure

1. Hold the test magnet where indicated on the side of the sensor housing for seven seconds.

2. Verify that the sensor’s Alarm LED turns on.

3. Reset the sensor by holding the test magnet against the sensor housing for two seconds.

4. Verify that the sensor’s Alarm LED turns off.

Controller Alarm Test

The controller alarm test checks the controller’s ability to initiate and indicate an alarm state.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

Controller Alarm Test Procedure

1. Press the controller’s test/reset switch for seven seconds.

2. Verify that the controller’s Alarm LED turns on.

3. Reset the sensor by pressing the test/reset switch for two seconds.

4. Verify that the controller’s Alarm LED turns off.

Dirty Controller Test

The dirty controller test checks the controller’s ability to initiate a dirty sensor test and indicate its results.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

Pressing the controller’s test/reset switch for longer than seven seconds will put the duct detector into the alarm state and activate all automatic alarm responses.

Dirty Controller Test Procedure

1. Press the controller’s test/reset switch for two seconds.

2. Verify that the controller’s Trouble LED flashes.

Dirty Sensor Test

The dirty sensor test provides an indication of the sensor’s ability to compensate for gradual environmental changes. A sensor that can no longer compensate for environmental changes is considered 100% dirty and requires cleaning or replacing. You must use a field provided SD−MAG test magnet to initiate a sensor dirty test. The sensor’s Dirty LED indicates the results of the dirty test as shown in Table 6.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

Holding the test magnet against the sensor housing for more than seven seconds will put the duct detector into the alarm state and activate all automatic alarm responses.

Table 6 – Dirty LED Test

FLASHES DESCRIPTION

1 0-25% dirty. (Typical of a newly installed detector)

2 25-50% dirty

3 51-75% dirty

4 76-99% dirty

Dirty Sensor Test Procedure

1. Hold the test magnet where indicated on the side of the sensor housing for two seconds.

2. Verify that the sensor’s Dirty LED flashes.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

Changing the dirty sensor test operation will put the detector into the alarm state and activate all automatic alarm responses. Before changing dirty sensor test operation, disconnect all auxiliary equipment from the controller and notify the proper authorities if connected to a fire alarm system.

Changing the Dirt Sensor Test

By default, sensor dirty test results are indicated by:

 The sensor’s Dirty LED flashing.  The controller’s Trouble LED flashing.  The controller’s supervision relay contacts toggle.

The operation of a sensor’s dirty test can be changed so that the controller’s supervision relay is not used to indicate test results. When two detectors are connected to a controller, sensor dirty test operation on both sensors must be configured to operate in the same manner.

To Configure the Dirty Sensor Test Operation

1. Hold the test magnet where indicated on the side of the sensor housing for approximately 60 seconds until the sensor’s Alarm LED turns on and its Dirty LED flashes twice.

2. Reset the sensor by removing the test magnet and then holding it against the sensor housing again for approximately 2 seconds until the sensor’s Alarm LED turns off.

Supervision relay contacts [3]

Wire must be

added by installer

TB3

Smoke Detector Controller

−

Auxiliary

equipment

18 Vdc (+)

18 Vdc (

−) 2

SD-TR14

Tro uble

Power

Alarm

Reset/ Test

Fig. 40 − Remote Test/Reset Station Connections

C08247

Remote Station Test

The remote station alarm test checks a test/reset station’s ability to initiate and indicate an alarm state.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE may result in an unnecessary evacuation of the facility.

Changing the dirty sensor test operation will put the detector into the alarm state and activate all automatic alarm responses. Before changing the dirty sensor test operation, disconnect all auxiliary equipment from the controller and notify proper authorities if connected to a fire alarm system.

SD−TRK4 Remote Alarm Test Procedure

1. Turn the key switch to the RESET/TEST position for seven seconds.

2. Verify that the test/reset station’s Alarm LED turns on.

3. Reset the sensor by turning the key switch to the RESET/TEST position for two seconds.

4. Verify that the test/reset station’s Alarm LED turns off.

Remote Test/Reset Station Dirty Sensor Test

The test/reset station dirty sensor test checks the test/reset station’s ability to initiate a sensor dirty test and indicate the results. It must be wired to the controller as shown in Fig. 40 and configured to operate the controller’s supervision relay. For more information, see “Changing the Dirty Sensor Test.”

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE can result in an unnecessary evacuation of the facility.

If the test/reset station’s key switch is left in the RESET/TEST position for longer than seven seconds, the detector will automatically go into the alarm state and activate all automatic alarm responses.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE can result in an unnecessary evacuation of the facility.

Holding the test magnet to the target area for longer than seven seconds will put the detector into the alarm state and activate all automatic alarm responses.

Dirty Sensor Test Using an SD−TRK4

1. Turn the key switch to the RESET/TEST position for two seconds.

2. Verify that the test/reset station’s Trouble LED flashes.

Detector Cleaning

Cleaning the Smoke Detector

Clean the duct smoke sensor when the Dirty LED is flashing continuously or sooner if conditions warrant.

NOTICE

OPERATIONAL TEST NOTICE

Failure to follow this NOTICE can result in an unnecessary evacuation of the facility.

If the smoke detector is connected to a fire alarm system, first notify the proper authorities that the detector is undergoing maintenance then disable the relevant circuit to avoid generating a false alarm.

1. Disconnect power from the duct detector then remove the sensor’s cover. (See Fig. 41.)

Sampling

tube

Airow

Fig. 41 − Sensor Cleaning Diagram

2. Using a vacuum cleaner, clean compressed air, or a soft bristle brush, remove loose dirt and debris from inside the sensor housing and cover. Use isopropyl alcohol and a lint−free cloth to remove dirt and other contaminants from the gasket on the sensor’s cover.

3. Squeeze the retainer clips on both sides of the optic housing then lift the housing away from the printed circuit board.

4. Gently remove dirt and debris from around the optic plate and inside the optic housing.

5. Replace the optic housing and sensor cover.

6. Connect power to the duct detector then perform a sensor alarm test.

HVAC duct

Sensor housing

Optic plate

Retainer clip

Optic housing

C07305

Alarm State

The smoke detector enters the alarm state when the amount of smoke particulate in the sensor’s sensing chamber exceeds the alarm threshold value. (See Table 7.) Upon entering the alarm state:

 The sensor’s Alarm LED and the controller’s Alarm

LED turn on.

 The contacts on the controller’s two auxiliary relays

switch positions.

 The contacts on the controller’s alarm initiation relay

close.

 The controller’s remote alarm LED output is activated

(turned on).

 The controller’s high impedance multiple fan shutdown

control line is pulled to ground Trouble state.

The SuperDuct duct smoke detector enters the trouble state under the following conditions:

 A sensor’s cover is removed and 20 minutes pass before

it is properly secured.

 A sensor’s environmental compensation limit is reached

(100% dirty).

 A wiring fault between a sensor and the controller is

detected.

An internal sensor fault is detected upon entering the trouble state:

 The contacts on the controller’s supervisory relay

switch positions. (See Fig. 42.)

 If a sensor trouble, the sensor’s Trouble LED the

controller’s Trouble LED turn on.

 If 100% dirty, the sensor’s Dirty LED turns on and the

controller’s Trouble LED flashes continuously.

 If a wiring fault between a sensor and the controller, the

controller’s Trouble LED turns on but not the sensor’s.

Tro uble

Alarm

Power

INDICATORS

Normal State

The smoke detector operates in the normal state in the absence of any trouble conditions and when its sensing chamber is free of smoke. In the normal state, the Power LED on both the sensor and the controller are on and all other LEDs are off.

Tes t /r e s et switch

C07298

Fig. 42 − Controller Assembly

NOTE: All troubles are latched by the duct smoke

detector. The trouble condition must be cleared and then the duct smoke detector must be reset in order to restore it to the normal state.

Table 7 – Detector Indicators

CONTROL OR INDICATOR DESCRIPTION

Magnetic test/reset switch

Alarm LED Indicates the sensor is in the alarm state.

Trouble LED Indicates the sensor is in the trouble state.

Dirty LED

Power LED Indicates the sensor is energized.

Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in the normal state.

Indicates the amount of environmental compensation used by the sensor (flashing continuously = 100%)

Resetting Alarm and Trouble Condition Trips:

Manual reset is required to restore smoke detector systems to Normal operation. For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an alarm or trouble condition. Check each sensor for Alarm or Trouble status. Clear the condition that has generated the trip at this sensor. Then reset the sensor by pressing and holding the reset button (on the side) for 2 seconds. Verify that the sensor’s Alarm and Trouble LEDs are now off. At the controller, clear its Alarm or Trouble state by pressing and holding the manual reset button (on the front cover) for 2 seconds. Verify that the controller’s Alarm and Trouble LEDs are now off. Replace all panels.

Troubleshooting

Controller’s Trouble LED is On

1. Check the Trouble LED on each sensor connected to the controller. If a sensor’s Trouble LED is on, determine the cause and make the necessary repairs.

2. Check the wiring between the sensor and the controller. If wiring is loose or missing, repair or replace as required.

Controller’s Trouble LED is Flashing

1. One or both of the sensors is 100% dirty.

2. Determine which Dirty LED is flashing then clean that sensor assembly as described in the detector cleaning section.

Sensor’s Trouble LED is On

1. Check the sensor’s Dirty LED. If it is flashing, the sensor is dirty and must be cleaned.

2. Check the sensor’s cover. If it is loose or missing, secure the cover to the sensor housing.

3. Replace sensor assembly.

Sensor’s Power LED is Off

1. Check the controller’s Power LED. If it is off, determine why the controller does not have power and make the necessary repairs.

2. Check the wiring between the sensor and the controller. If wiring is loose or missing, repair or replace as required.

Controller’s Power LED is Off

1. Make sure the circuit supplying power to the controller is operational. If not, make sure JP2 and JP3 are set correctly on the controller before applying power.

2. Verify that power is applied to the controller’s supply input terminals. If power is not present, replace or repair wiring as required.

Remote Test/Reset Station’s Trouble LED Does Not flash When Performing a Dirty Test, but the Controller’s Trouble LED Does

1. Verify that the remote test/station is wired as shown in Fig. 40. Repair or replace loose or missing wiring.

2. Configure the sensor dirty test to activate the controller’s supervision relay. See “Changing Sensor Dirty Test Operation.”

Sensor’s Trouble LED is On, But the Controller’s Trouble LED is OFF

Remove JP1 on the controller.

PROTECTIVE DEVICES

Compressor Protection

Overcurrent

The compressor has internal linebreak motor protection. Reset is automatic after compressor motor has cooled.

Overtemperature

Each compressor has an internal protector to protect it against excessively high discharge gas temperatures. Reset is automatic.

High Pressure Switch

The system is provided with a high pressure switch mounted on the discharge line. The switch is stem−mounted and brazed into the discharge tube. Trip setting is 630 psig ± 10 psig (4344 ± 69 kPa) when hot. Reset is automatic at 505 psig (3482 kPa).

Low Pressure Switch

The system is protected against a loss of charge and low evaporator coil loading condition by a low pressure switch located on the suction line near the compressor. The switch is stem−mounted. Trip setting is 54 psig ± 5 psig (372 ± 34 kPa). Reset is automatic at 117 ± 5 psig (807 ± 34 kPa).

Supply (Indoor) Fan Motor Protection

WARNING

PERSONAL INJURY HAZARD

Failure to follow this WARNING can result in personal injury.

Disconnect all electrical power when servicing the fan motor. Apply appropriate lockout/tagout procedures.

Motors with 2.9 and 3.7 bhp are equipped with an internal overtemperature or protection device. The type of device depends on the motor size. See Table 8.

The High Static option supply fan motor is equipped with a pilot−circuit Thermix combination overtemperature/ overcurrent protection device. This device resets automatically. Do not bypass this switch to correct trouble. Determine the cause and correct it.

The Thermik device is a snap−action overtemperature protection device that is embedded in the motor windings. The Thermik can be identified by two blue wires extending out of the motor control box. It is a pilot−circuit device that is wired into the unit’s 24V control circuit. When this switch reaches its trip setpoint, it opens the 24V control circuit and causes all unit operation to cease. This device resets automatically when the motor windings cool. Do not bypass this switch to correct trouble. Determine the cause and correct it.

The External Overload Breaker is an overcurrent device used on motors with a horsepower rating of 4.7 hp or greater. This is a specially−calibrated circuit breaker that is UL recognized as a motor overload controller. When the current to the motor exceeds the circuit breaker setpoint, the device opens all motor power leads to the motor, shutting the motor down. Reset requires a manual reset at the overload switch. This device (designated IFCB) is located on the side of the supply fan housing,

behind the fan access panel. The Must Hold and Must Trip values are listed on the side of the External Overload Breaker.

Troubleshooting Supply Fan Motor Overload Trips

The supply fan used in 50TC units is a forward−curved centrifugal wheel. At a constant wheel speed, this wheel has a characteristic that causes the fan shaft load to DECREASE when the static pressure in the unit−duct system increases and to INCREASE when the static pressure in the unit−duct system decreases (and fan airflow rate increases). Motor overload conditions typically develop when the unit is operated with an access panel removed, with unfinished duct work, in an economizer−open mode, or a leak develops in the duct system that allows a bypass back to unit return opening.

Table 8 – Overcurrent Device Type

Motor Size (bhp) Overload Device Reset

1.7 Internal Linebreak Automatic

2.4 Internal Linebreak Automatic

2.9 Thermik Automatic

3.7 Thermik Automatic

4.7 External (circuit breaker) Manual

Condenser Fan Motor Protection

The condenser fan motor is internally protected against overtemperature.

Control Circuit, 24−V

The control circuit is protected against overcurrent conditions by a circuit breaker mounted on the control transformer TRAN. Reset is manual.

PREMIERLINK] CONTROL

The factory−installed PremierLink Controller includes the supply−air temperature (SAT) sensor. The outdoor air temperature (OAT) sensor is included in the FIOP/accessory EconoMi$er 2 package.

Refer to Fig. 43 for PremierLink connection locations.

NOTE: Refer to PremierLink Installation, Start−Up and Configuration Instructions. Have a copy of this

manual available at unit start−up.

Fig. 43 − PremierLinkt Controller

C08199

The PremierLink controller is compatible with Carrier Comfort Network (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 Navigator and Scrolling Marquee are not suitable for use with latest PremierLink controller (Version 2.x).)

The PremierLink control is factory−mounted in the 50TC unit’s main control box to the left of the LCTB. Factory wiring is completed through harnesses connected to the LCTB thermostat. Field connections are made at a 16−pole terminal block (TB1) 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$er 2 package.

RTU−OPEN CONTROL SYSTEM

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.

The RTU Open control is factory−mounted in the 50TC unit’s main control box, to the left of the Light Commercial Terminal Board (LCTB). See Fig. 44. Factory wiring is completed through harnesses connected to the LCTB. 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.

Sensory/Accessory Installation

IMPORTANT: Refer to the specific sensor or accessory

instructions for its proper installation and for rooftop unit installation refer to base unit installation instructions and the unit’s wiring diagrams.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death, and/or equipment damage.

Disconnect and lockout/tagout electrical power before wiring the RTU−OPEN controller.

Additional RTU−OPEN Installation and Troubleshooting

Additional installation, wiring and troubleshooting information for the RTU−OPEN Controller can be found in the following manuals: “Controls, Start−up, Operation

and Troubleshooting Instructions,” and “RTU Open Installation and Start−up Guide.”

There are a variety of sensors and accessories available for the RTU−OPEN. Some of these can be factory or field installed, while others are only field installable. The RTU −OPEN controller may also require connection to a building network system or building zoning system. All field control wiring that connects to the RTU−OPEN must be routed through the raceway built into the corner post of the unit or secured to the unit control box with electrical conduit. The unit raceway provides the UL required clearance between high and low−voltage wiring. Pass the control wires through the hole provided in the corner post, then feed the wires thorough the raceway to the RTU −OPEN. Connect the wires to the removable Phoenix connectors and then reconnect the connectors to the board. See Fig. 44.

Fig. 44 − RTU−OPEN Control Module

C10818

ECONOMI$ER SYSTEMS

IMPORTANT: Any economizer that meets the economizer requirements as laid out in California’s Title 24 mandatory section 120.2 (fault detection and diagnostics) and/or prescriptive section 140.4 (life−cycle tests, damper leakage, 5 year warranty, sensor accuracy, etc), will have a label on the economizer. Any economizer without this label does not meet California’s Title 24. The five year limited parts warranty referred to in section

140.4 only applies to factory installed economizers. Please refer to your economizer on your unit.

The 50TC units may be equipped with a factory−installed or accessory (field−installed) EconoMi$er system. Two types are available: with a logic control system (EconoMi$er IV) and without a control system (EconoMi$er2). See Fig. 45 for component locations on each type. See Figs. 46 and 47 for EconoMi$er section wiring diagrams. Both EconoMi$ers use direct−drive damper actuators.

WIRING

HARNESS

CTUATOR

ECONOMI$ER2 PLUG

ECONOMIER IV CONTROLLER

OUTSIDE AIR TEMPERATURE SENSOR

LOW AMBIENT SENSOR

OUTDOOR AIR HOOD

HOOD SHIPPING BRACKET

C06021

BAROMETRIC RELIEF DAMPER

GEAR DRIVEN DAMPER

C06022

Fig. 45 − EconoMi$er IV Component Locations

FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK

DCV— Demand Controlled Ventilation IAQ — Indoor Air Quality LA — Low Ambient Lockout Device OAT — Outdoor-Air Temperature POT— Potentiometer RAT— Return-Air Temperature

LEGEND

Potentiometer Defaults Settings: Power Exhaust Middle Minimum Pos. Fully Closed DCV Max. Middle DCV Set Middle Enthalpy C Setting

Fig. 46 − EconoMi$er IV Wiring

NOTES:

1. 620 ohm, 1 watt 5% resistor should be removed only when using differential enthalpy or dry bulb.

2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.

3. For field-installed remote minimum position POT, remove black wire jumper between P and P1 and set control minimum position POT to the minimum position.

C06028

BLACK

500 OHM RESISTOR

VIOLET

NOTE 1

RUN

NOTE 3

50HJ540573

ACTUATOR ASSEMBLY

DIRECT DRIVE

ACTUATOR

NOTES:

1. Switch on actuator must be in run position for economizer to operate.

2. PremierLink™ control requires that the standard 50HJ540569 outside-air sensor be replaced by either the CROASENR001A00 dry bulb sen sor or HH57A077 enthalpy sensor.

3. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.

OAT SENSOR

4-20mA SIGNAL

PINK

YELLOW

WHITE

TRANSFORMER GROUND

BLUE

RED

ECONOMISER2 PLUG

24 VAC

4-20 mA TO J9 ON PremierLink BOARD

C08310

Fig. 47 − EconoMi$er2 with 4 to 20 mA Control Wiring

Table 9 – EconoMi$er IV Input/Output Logic

INPUTS OUTPUTS

Demand Control

Ventilation (DCV)

(Free Cooling LED Off)

Below set

(DCV LED Off)

(Free Cooling LED On)

Enthalpy*

Outdoor Return

High

Low

High

Y1 Y2

On On On On

On Off On Off

Off Off Off Off

On On On Off

On Off Off Off

Off Off Off Off Minimum position Closed

On On On On

On Off On Off

Off Off Off Off

On On On Off

On Off Off Off

Above set

(DCV LED On)

(Free Cooling LED Off)

High

Low

(Free Cooling LED On)

Low

High

Off Off Off Off

* For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint. † Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied). ** Modulation is based on the supply‐air sensor signal. †† Modulation is based on the DCV signal. *** Modulation is based on the greater of DCV and supply‐air sensor signals, between minimum position and either maximum

position (DCV) or fully open (supply‐air signal).

††† Modulation is based on the greater of DCV and supply‐air sensor signals, between closed and either maximum position

(DCV) or fully open (supply‐air signal).

Compressor N Terminal†

Stage1Stage

Occupied Unoccupied

Damper

Minimum position Closed

Modulating** (between min.

position and full‐open)

Modulating†† (between min.

position and DCV

maximum)

Modulating*** Modulating†††

Modulating** (between

closed and full‐open)

Modulating†† (between

closed and DCV

maximum)

Fig. 48 − EconoMi$er IV Functional View

C06053

EconoMi$er IV Standard Sensors

Table 9 provides a summary of EconoMi$er IV I/O logic. A functional view of the EconoMi$er is shown in Fig. 48. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available to help with EconoMi$er IV training and troubleshooting.

Outdoor Air Temperature (OAT) Sensor

The outdoor air temperature sensor (HH57AC074) is a 10 to 20 mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the EconoMi$er IV can be used for free cooling. The sensor is factory-installed on the EconoMi$er IV in the outdoor airstream. See Fig. 49. The operating range of temperature measurement is 40 to 100F (4 to 38C). See Fig. 67.

Supply Air Temperature (SAT) Sensor

The supply air temperature sensor is a 3 K thermistor located at the inlet of the indoor fan. See Fig. 49. This sensor is factory installed. The operating range of temperature measurement is 0° to 158F (−18 to 70C). See Table 49 for sensor temperature/resistance values.

The temperature sensor looks like an eyelet terminal with wires running to it. The sensor is located in the “crimp end” and is sealed from moisture.

Outdoor Air Lockout Sensor

The EconoMi$er IV is equipped with an ambient temperature lockout switch located in the outdoor airstream which is used to lock out the compressors below a 42F (6C) ambient temperature. See Fig. 61.

SUPPLY

AIR TEMPERATURE

SENSOR MOUNTING

LOCATION

SUPPLY AIR

TEMPERATURE

SENSOR

(SEALED

INSIDE CRIMP

END)

C06033

Fig. 49 − Supply Air Sensor Location

EconoMi$er IV Control Modes

IMPORTANT: The optional EconoMi$er2 does not include

a controller. The EconoMi$er2 is operated by a 4 to 20 mA signal from an existing field-supplied controller. See Fig. 62 for wiring information.

Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. The EconoMi$er IV is supplied from the factory with a supply−air temperature sensor and an outdoor− air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the EconoMi$er IV and unit.

Outdoor Dry Bulb Changeover

The standard controller is shipped from the factory configured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to an adjustable setpoint selected on the control. If the outdoor-air temperature is above the setpoint, the EconoMi$er IV will adjust the outside air dampers to minimum position. If the outdoor-air temperature is below the setpoint, the position of the outside air dampers will be controlled to provided free cooling using outdoor air. When in this mode, the LED next to the free cooling setpoint potentiometer will be on. The changeover temperature setpoint is controlled by the free cooling setpoint potentiometer located on the control. See Fig. 50. The scale on the potentiometer is A, B, C, and D. See Fig. 51 for the corresponding temperature changeover values.

0.13 0. 20 0.22 0.25 0.30 0.35 0 .40 0.45 0. 50

FLOW IN CUBIC FEET PER MINUTE (cfm)

STATIC PRESSURE (in. wg)

C06031

Fig. 52 − Outdoor−Air Damper Leakage

Differential Dry Bulb Control

For differential dry bulb control the standard outdoor dry bulb sensor is used in conjunction with an additional accessory dry bulb sensor (p/n: CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. See Fig. 53. Wiring is provided in the EconoMi$er IV wiring harness.

ECONOMI$ER IV CONTROLLER

C06034

Fig. 50 − EconoMi$er IV Controller Potentiometer

and LED Locations

LED ON

LED OFF

DEGREES FAHRENHEIT

LED ON

LED OFF

LED ON

LED OFF

100

C06035

LED OFF

Fig. 51 − Outside Air Temperature Changeover

Setpoints

ECONOMI$ER IV

GROMMET

RETURN AIR SENSOR

RETURN DUCT (FIELD-PROVIDED)

C07085

Fig. 53 − Return Air Temperature or Enthalpy Sensor

Mounting Location

In this mode of operation, the outdoor-air temperature is compared to the return-air temperature and the lower temperature airstream is used for cooling. When using this mode of changeover control, turn the enthalpy setpoint potentiometer fully clockwise to the D setting. See Fig. 50.

Outdoor Enthalpy Changeover

For enthalpy control, accessory enthalpy sensor (p/n: HH57AC078) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. See Fig. 70. When the outdoor air enthalpy rises above the outdoor enthalpy changeover setpoint, the outdoor-air damper moves to its minimum position. The outdoor enthalpy changeover setpoint is set with the outdoor enthalpy setpoint potentiometer on the EconoMi$er IV controller. The setpoints are A, B, C, and D. See Fig. 51. The factory-installed 620-ohm jumper must be in place across terminals SR and SR+ on the EconoMi$er IV controller.

CONTROL

CURVE

B C D

CONTROL POINT

APPROX.

AT 50% RH

73 (23) 7 (21) 7 (19) 3 (17)

3 (2)

deg. F (deg. C)

ENTHALPY BTU PER POUND DRY AIR

(13)

(1 )

(7) 4 (4)

(1 )

(21)

(1 )

(29)9(32)9(3 )1(3 )1(41)11(43)

(27)

(24)

RELATIVE HUMIDITY (%)

(2)

(4)

(7)

(1 )

(13)

(1 )

APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C)

Fig. 54 − Enthalpy Changeover Setpoints

FACTORY JUMPER

TR1

AQ1

SO+

SR+

EXH

2V 10V

Open

2V 10V

Free Cool

Set

EXH

Min Pos

DCV Max

DCV

Set

24 Vac

Va c

COM

HOT

EF1

C06038

Fig. 55 − EconoMi$er IV Control

Differential Enthalpy Control

For differential enthalpy control, the EconoMi$er IV controller uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return air duct. The EconoMi$er IV controller compares

(21)

(24)

(27)

(29)9(32)9(3 )1(3 )

1 (41)11(43)

HIGH LIMIT CURVE

the outdoor air enthalpy to the return air enthalpy to determine EconoMi$er IV use. The controller selects the lower enthalpy air (return or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air, the EconoMi$er IV opens to bring in outdoor air for free cooling.

Replace the standard outside air dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. See Fig. 45. Mount the return air enthalpy sensor in the return air duct. See Fig. 53. Wiring is provided in the EconoMi$er IV wiring harness. See Fig.

46. The outdoor enthalpy changeover setpoint is set with the outdoor enthalpy setpoint potentiometer on the EconoMi$er IV controller. When using this mode of changeover control, turn the enthalpy setpoint potentiometer fully clockwise to the D setting.

Indoor Air Quality (IAQ) Sensor Input

The IAQ input can be used for demand control ventilation control based on the level of CO2 measured in the space or return air duct.

Mount the accessory IAQ sensor according to manufacturer specifications. The IAQ sensor should be wired to the AQ and AQ1 terminals of the controller. Adjust the DCV potentiometers to correspond to the DCV voltage output of the indoor air quality sensor at the user-determined setpoint. See Fig. 56.

C06037

CO SENSOR MAX RANGE SETTING

6000

5000

4000

3000

2000

1000

RANGE CONFIGURATION (ppm)

2345678

DAMPER VOLTAGE FOR MAX VENTILATION RATE

800 ppm 900 ppm 1000 ppm 1100 ppm

C06039

Fig. 56 − CO2 Sensor Maximum Range Settings

If a separate field-supplied transformer is used to power the IAQ sensor, the sensor must not be grounded or the EconoMi$er IV control board will be damaged.

When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compounds) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.

When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied ventilation position. The maximum demand ventilation position should be turned fully clockwise.

Exhaust Setpoint Adjustment

The exhaust setpoint will determine when the exhaust fan runs based on damper position (if accessory power exhaust is installed). The setpoint is modified with the Exhaust Fan Setpoint (EXH SET) potentiometer. See Fig.

50. The setpoint represents the damper position above which the exhaust fans will be turned on. When there is a call for exhaust, the EconoMi$er IV controller provides a

45 ± 15 second delay before exhaust fan activation to allow the dampers to open. This delay allows the damper to reach the appropriate position to avoid unnecessary fan overload.

Minimum Position Control

There is a minimum damper position potentiometer on the EconoMi$er IV controller. See Fig. 50. The minimum damper position maintains the minimum airflow into the building during the occupied period.

When using demand ventilation, the minimum damper position represents the minimum ventilation position for Volatile Organic Compound (VOC) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.

Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least 10F temperature difference between the outdoor and return-air temperatures.

To determine the minimum position setting, perform the following procedure:

1. Calculate the appropriate mixed air temperature using the following formula:

O x

100 100

+ (TR x

)

) =T

TO = Outdoor-Air Temperature OA = Percent of Outdoor Air

= Return-Air Temperature

RA = Percent of Return Air TM = Mixed-Air Temperature As an example, if local codes require 10% outdoor

air during occupied conditions, outdoor-air temperature is 60F, and return-air temperature is 75F.

(60 x .10) + (75 x .90) = 73.5F

2. Disconnect the supply air sensor from terminals T and T1.

3. Ensure that the factory-installed jumper is in place across terminals P and P1. If remote damper positioning is being used, make sure that the terminals are wired according to Fig. 52 and that the minimum position potentiometer is turned fully clockwise.

4. Connect 24 vac across terminals TR and TR1.

5. Carefully adjust the minimum position potentiometer until the measured mixed air temperature matches the calculated value.

6. Reconnect the supply air sensor to terminals T and T1.

Remote control of the EconoMi$er IV damper is desirable when requiring additional temporary ventilation. If a field-supplied remote potentiometer (Honeywell p/n: S963B1128) is wired to the EconoMi$er IV controller, the minimum position of the damper can be controlled from a remote location.

To control the minimum damper position remotely, remove the factory-installed jumper on the P and P1 terminals on the EconoMi$er IV controller. Wire the field-supplied potentiometer to the P and P1 terminals on the EconoMi$er IV controller. (See Fig. 54.)

Damper Movement

Damper movement from full open to full closed (or vice versa) takes 21/2 minutes.

Thermostats

The EconoMi$er IV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage

2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.

Occupancy Control

The factory default configuration for the EconoMi$er IV control is occupied mode. Occupied status is provided by the black jumper from terminal TR to terminal N. When

unoccupied mode is desired, install a field−supplied timeclock function in place of the jumper between TR and N. When the timeclock contacts are closed, the EconoMi$er IV control will be in occupied mode. When the timeclock contacts are open (removing the 24V signal from terminal N), the EconoMi$er IV will be in unoccupied mode.

Demand Control Ventilation (DCV)

When using the EconoMi$er IV for demand controlled ventilation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditions. The maximum damper position must be calculated to provide the desired fresh air.

Typically the maximum ventilation rate will be about 5 to 10% more than the typical cfm required per person, using normal outside air design criteria.

A proportional anticipatory strategy should be taken with the following conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation rate means the equipment can condition air at a maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. A proportional-anticipatory strategy will cause the fresh air supplied to increase as the room CO2 level increases even though the CO2 setpoint has not been reached. By the time the CO2 level reaches the setpoint, the damper will be at maximum ventilation and should maintain the setpoint.

In order to have the CO2 sensor control the economizer damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation required to remove contaminants during unoccupied periods. The following equation may be used to determine the percent of outside air entering the building for a given damper position. For best results there should be at least a 10 degree difference in outside and return-air temperatures.

O x

100 100

+ (TR x

)

) =T

TO = Outdoor-Air Temperature OA = Percent of Outdoor Air TR = Return-Air Temperature RA = Percent of Return Air TM = Mixed-Air Temperature

Once base ventilation has been determined, set the minimum damper position potentiometer to the correct position.

The same equation can be used to determine the occupied or maximum ventilation rate to the building. For example, an output of 3.6 volts to the actuator provides a base ventilation rate of 5% and an output of 6.7 volts provides the maximum ventilation rate of 20% (or base plus 15 cfm per person). Use Fig. 56 to determine the maximum setting of the CO2 sensor. For example, an 1100 ppm setpoint relates to a 15 cfm per person design. Use the

1100 ppm curve on Fig. 56 to find the point when the CO sensor output will be 6.7 volts. Line up the point on the graph with the left side of the chart to determine that the range configuration for the CO2 sensor should be 1800 ppm. The EconoMi$er IV controller will output the 6.7 volts from the CO2 sensor to the actuator when the CO concentration in the space is at 1100 ppm. The DCV setpoint may be left at 2 volts since the CO2 sensor voltage will be ignored by the EconoMi$er IV controller until it rises above the 3.6 volt setting of the minimum position potentiometer.

Once the fully occupied damper position has been determined, set the maximum damper demand control ventilation potentiometer to this position. Do not set to the maximum position as this can result in over-ventilation to the space and potential high humidity levels.

CO2 Sensor Configuration

The CO2 sensor has preset standard voltage settings that can be selected anytime after the sensor is powered up. See Table 10.

Use setting 1 or 2 for CarrierBryant equipment. See Table

10.

1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

Table 10 – EconoMi$er IV Sensor Usage

ECONOMI$ER IV WITH OUTDOOR AIR DRY

APPLICATION

Outdoor Air

Dry Bulb

Differential

Dry Bulb

Single Enthalpy HH57AC078

Differential

Enthalpy

CO2 for DCV

Control using a

Wall‐Mounted

CO2 Sensor

CO2 for DCV

Control using a

Duct‐Mounted

CO2 Sensor

* CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may

contain parts that will not be needed for installation. † 33ZCSENCO2 is an accessory CO2 sensor. ** 33ZCASPCO2 is an accessory aspirator box required for duct‐

mounted applications. †† CRCBDIOX005A00 is an accessory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

None. The outdoor air dry bulb sensor is

HH57AC078 and CRENTDIF004A00*

33ZCSENCO2† and

33ZCASPCO2**OR

BULB SENSOR

Accessories Required

factory installed.

CRTEMPSN002A00*

33ZCSENCO2

CRCBDIOX005A00††

3. Use the Up/Down button to select the preset number. See Table 10.

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO2 sensor can be changed anytime after the sensor is energized. Follow the steps below to change the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD menu and press Enter.

4. Use the Up/Down button to toggle through each of the nine variables, starting with Altitude, until the desired setting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode to continue to the next variable.

Dehumidification of Fresh Air with DCV (Demand Controlled Ventilation) Control

If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit and/or a dehumidification option should be considered.

EconoMi$er IV Preparation

This procedure is used to prepare the EconoMi$er IV for troubleshooting. No troubleshooting or testing is done by performing the following procedure.

NOTE: This procedure requires a 9V battery, 1.2 kilo−ohm resistor, and a 5.6 kilo−ohm resistor which are not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.

1. Disconnect power at TR and TR1. All LEDs should be off. Exhaust fan contacts should be open.

2. Disconnect device at P and P1.

3. Jumper P to P1.

4. Disconnect wires at T and T1. Place 5.6 kilo−ohm resistor across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals SO and +. Connect 1.2 kilo−ohm 4074EJM checkout resistor across terminals SO and +.

8. Put 620−ohm resistor across terminals SR and +.

9. Set minimum position, DCV setpoint, and exhaust potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW (clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TR1.

Differential Enthalpy

To check differential enthalpy:

1. Make sure EconoMi$er IV preparation procedure has been performed.

2. Place 620−ohm resistor across SO and +.

3. Place 1.2 kilo−ohm resistor across SR and +. The Free Cool LED should be lit.

4. Remove 620−ohm resistor across SO and +. The Free Cool LED should turn off.

5. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

Single Enthalpy

To check single enthalpy:

1. Make sure EconoMi$er IV preparation procedure has been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The Free Cool LED should be lit.

3. Set the enthalpy potentiometer to D (fully CW). The Free Cool LED should turn off.

4. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

DCV (Demand Controlled Ventilation) and Power Exhaust

To check DCV and Power Exhaust:

1. Make sure EconoMi$er IV preparation procedure has been performed.

2. Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuator should be fully closed.

3. Connect a 9V battery to AQ (positive node) and AQ1 (negative node). The LED for both DCV and Exhaust should turn on. The actuator should drive to between 90 and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust LED turns off. The LED should turn off when the potentiometer is approximately 90%. The actuator should remain in position.

5. Turn the DCV setpoint potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9−v. The actuator should drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on. The exhaust contacts will close 30 to 120 seconds after the LED turns on.

7. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

DCV Minimum and Maximum Position

To check the DCV minimum and maximum position:

1. Make sure EconoMi$er IV preparation procedure has been performed.

2. Connect a 9v battery to AQ (positive node) and AQ1 (negative node). The DCV LED should turn on. The actuator should drive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

4. Turn the DCV Maximum Position potentiometer to fully CCW. The actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

6. Turn the Minimum Position Potentiometer fully CW. The actuator should drive fully open.

7. Remove the jumper from TR and N. The actuator should drive fully closed.

8. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

Supply−Air Sensor Input

To check supply−air sensor input:

1. Make sure EconoMi$er IV preparation procedure has been performed.

2. Set the Enthalpy potentiometer to A. The Free Cool LED turns on. The actuator should drive to between 20 and 80% open.

3. Remove the 5.6 kilo−ohm resistor and jumper T to T1. The actuator should drive fully open.

4. Remove the jumper across T and T1. The actuator should drive fully closed.

5. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

EconoMi$er IV Troubleshooting Completion

This procedure is used to return the EconoMi$er IV to operation. No troubleshooting or testing is done by performing the following procedure.

1. Disconnect power at TR and TR1.

2. Set enthalpy potentiometer to previous setting.

3. Set DCV maximum position potentiometer to previous setting.

4. Set minimum position, DCV setpoint, and exhaust potentiometers to previous settings.

5. Remove 620−ohm resistor from terminals SR and +.

6. Remove 1.2 kilo−ohm checkout resistor from terminals SO and +. If used, reconnect sensor from terminals SO and +.

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo−ohm resistor from T and T1. Reconnect wires at T and T1.

10. Remove jumper from P to P1. Reconnect device at P and P1.

11. Apply power (24 vac) to terminals TR and TR1.

PRE−START−UP/START−UP

WARNING

PERSONAL INJURY HAZARD

Failure to follow this warning could result in personal injury or death.

1. Follow recognized safety practices and wear approved Personal Protective Equipment (PPE), including safety glasses and gloves when checking or servicing refrigerant system.

2. Do not use a torch to remove any component. System contains oil and refrigerant under pressure. To remove a component, wear PPE and proceed as follows:

a. Shut off all electrical power to unit. Apply

applicable Lock−out/Tagout procedures.

b. Recover refrigerant to relieve all pressure

from system using both high−pressure and low pressure ports.

c. Do not use a torch. Cut component connec-

tion tubing with tubing cutter and remove component from unit.

d. Carefully un−sweat remaining tubing stubs

when necessary. Oil can ignite when exposed to torch flame.

3. Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

4. Do not remove compressor terminal cover until all electrical power is disconnected and approved Lock−out/Tagout procedures are in place.

5. Relieve all pressure from system before touching or disturbing anything inside terminal box whenever refrigerant leak is suspected around compressor terminals.

6. Never attempt to repair a soldered connection while refrigerant system is under pressure.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning result in personal injury or death.

The unit must be electrically grounded in accordance with local codes and NEC ANSI/NFPA 70 (American National Standards Institute/National fire Protection Association.

Proceed as follows to inspect and prepare the unit for initial start−up:

1. Remove all access panels.

2. Read and follow instructions on all WARNING, CAUTION, and INFORMATION labels attached to, or shipped with, unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages such

as broken lines, loose parts, or disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connec-

tions and on unit base. Detecting oil generally indicates a refrigerant leak. Leak−test all refrigerant tubing connections using electronic leak detector, halide torch, or liquid−soap solution.

c. Inspect all field−wiring and factory−wiring con-

nections. Be sure that connections are completed and tight. Be sure that wires are not in contact with refrigerant tubing or sharp edges.

d. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that condenser−fan blade are correctly

positioned in fan orifice. See Condenser−Fan Adjustment section for more details.

b. Make sure that air filter(s) is in place.

c. Make sure that condensate drain trap is filled

with water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose

parts have been removed.

START−UP, GENERAL

Unit Preparation

Make sure that unit has been installed in accordance with installation instructions and applicable codes.

IMPORTANT: Follow the base unit’s start-up sequence as described in the unit’s installation instructions:

In addition to the base unit start-up, there are a few steps needed to properly start-up the controls. RTU-OPEN’s Service Test function should be used to assist in the base unit start-up and also allows verification of output operation. Controller configuration is also part of start-up. This is especially important when field accessories have been added to the unit. The factory pre-configures options installed at the factory. There may also be additional installation steps or inspection required during the start-up process.

Additional Installation/Inspection

Inspect the field installed accessories for proper installation, making note of which ones do or do not require configuration changes. Inspect the RTU-OPEN’s Alarms for initial insight to any potential issues. Refer to the following manual: “Controls, Start−up, Operation and Troubleshooting Instructions.” Inspect the SAT sensor for relocation as intended during installation. Inspect special wiring as directed below.

Return−Air Filters

Ensure correct filters are installed in unit (see Appendix II

− Physical Data). Do not operate unit without return−air filters.

Outdoor−Air Inlet Screens

Outdoor−air inlet screen must be in place before operating unit.

Compressor Mounting

Compressors are internally spring mounted. Do not loosen or remove compressor hold down bolts.

Internal Wiring

Check all electrical connections in unit control boxes. Tighten as required.

Refrigerant Service Ports

Each unit system has two 1/4” SAE flare (with check valves) service ports: one on the suction line, and one on the compressor discharge line. Be sure that caps on the ports are tight.

Compressor Rotation

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this CAUTION could result in equipment damage.

Scroll compressors can only compress refrigerant if rotating in the right direction. Reverse rotation for extended times can result in internal damage to the compressor. Scroll compressors are sealed units and cannot be repaired on−site.

6. Replace the compressor if suction/discharge pressures are not within specifications for the specific compressor.

Cooling

Set space thermostat to OFF position. To start unit, turn on main power supply. Set system selector switch at COOL position and fan switch at AUTO. position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor.

Check unit charge. Refer to Refrigerant Charge section.

Reset thermostat at a position above room temperature. Compressor will shut off. Evaporator fan will shut off after a 30−second delay.

To shut off unit, set system selector switch at OFF position. Resetting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting.

NOTE: The default value for the evaporator−fan motor on/off delay is 45 seconds. The Integrated Gas Unit Controller (IGC) modifies this value when abnormal limit switch cycles occur. Based upon unit operating conditions, the on delay can be reduced to 0 seconds and the off delay can be extended to 180 seconds. When one flash of the LED is observed, the evaporator−fan on/off delay has been modified.

Ventilation (Continuous Fan)

Set fan and system selector switches at ON and OFF positions, respectively. Evaporator fan operates continuously to provide constant air circulation. When the evaporator−fan selector switch is turned to the OFF position, there is a 30−second delay before the fan turns off.

NOTE: When the compressor is rotating in the wrong direction, the unit will make an elevated level of noise and will not provide cooling.

On 3−phase units with scroll compressors, it is important to be certain compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the proper direction:

1. Connect service gauges to suction and discharge pressure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start−up.

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

1. Note that the evaporator fan is probably also rotating in the wrong direction.

2. Turn off power to the unit and install lockout tag.

3. Reverse any two of the unit power leads.

4. Reapply electrical power to the compressor.

5. The suction pressure should drop, and the discharge pressure should rise, which is normal for scroll compressors on start−up.

START−UP, PREMIERLINK] CONTROLS

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

The unit must be electrically grounded in accordance with local codes and NEC ANSI/NFPA 70 (American National Standards Institute/National Fire Protection Association.)

Use the Carrier network communication software to start up and configure the PremierLink controller.

Changes can be made using the ComfortWORKS software, ComfortVIEW software, Network Service Tool, System Pilot device, or Touch Pilot device. The System Pilot and Touch Pilot are portable interface devices that allow the user to change system set−up and setpoints from a zone sensor or terminal control module. During start−up, the Carrier software can also be used to verify communication with PremierLink controller.

NOTE: All set−up and setpoint configurations are factory set and field−adjustable.

For specific operating instructions, refer to the literature provided with user interface software.

NOTICE

SET−UP INSTRUCTIONS

All set−up and set point configurations are factory set and field−adjustable.

Refer to the PremierLinkt Installation, Start−Up and Configuration Instructions for specific operating instructions for the controller. Have a copy of this manual available at unit start−up.

Perform System Check−Out

1. Check correctness and tightness of all power and communication connections.

2. At the unit, check fan and system controls for proper operation.

3. At the unit, check electrical system and connections of any optional electric reheat coil.

4. Check to be sure the area around the unit is clear of construction dirt and debris.

5. Check that final filters are installed in the unit. Dust and debris can adversely affect system operation.

6. Verify that the PremierLink controls are properly connected to the CCN bus.

START−UP, RTU−OPEN CONTROLS

NOTICE

SET−UP INSTRUCTIONS

Refer to the following manuals for additional installation, wiring and troubleshooting information for the RTU−OPEN Controller.: “Controls, Start−up,

Operation and Troubleshooting Instructions,” “RTU Open Installation and Start−up Guide” and “RTU−Open Integration Guide”. Have a copy of these

manuals available at unit start−up.

FASTENER TORQUE VALUES

Table 11 – Torque Values

Supply fan motor mounting

Supply fan motor adjustment plate

Motor pulley setscrew

Fan pulley setscrew

Blower wheel hub setscrew

Bearing locking collar setscrew 50 in-lbs (6.2 Nm) — 60 in-lbs (6.8 Nm)

Compressor mounting bolts 65 in-lbs (7.3 Nm) — 75 in-lbs (8.5Nm)

Condenser fan motor mounting bolts

Condenser fan hub setscrew

Serial Number Format

POSITION NUMBER 1 2 3 4 5 6 7 8 9 10

TYPICAL 4 8 0 8 G 1 2 3 4 5

POSITION DESIGNATES

1−2 Week of manufacture (fiscal calendar)

3−4 Year of manufacture (“08” = 2008)

5 Manufacturing location (G = ETP, Texas, USA)

6−10 Sequential number

120 in-lbs (13.6 Nm) ± 12 in-lbs (1.4Nm)

72 in-lbs (8.1 Nm) ± 5 in-lbs (0.6 Nm)

20 in-lbs (2.3 Nm) ± 2 in-lbs 0.2 Nm)

84 in-lbs (9.5 Nm) ± 12 in-lbs (1.4 Nm)

APPENDIX I. MODEL NUMBER NOMENCLATURE

Position:

1234567891011 12 13 14 15 16

Example:

50TC- D24A3A5- 0A0A0

Unit Heat Type

50 - Elect. Heat Pkgd Rooftop

Model Series - WeatherMaker™

TC - Standard Efficiency

ElectricHeat Options

- = Standard (No Electric Heat) A = Low Electric Heat B = Medium Electric Heat C = High Electric Heat

Refrig. Systems Options

D = Two stage cooling E = Two stage cooling models with Humidi-MiZer

Cooling Tons

17/18 = 15 tons 20/21 = 17.5 tons 24/25 = 20 tons 28/29 = 25 tons 30 = 27.5 tons

Sens or Options

A = None B = RA Smoke Detector C = SA Smoke Detector D = RA + SA Smoke Detector E = CO F = RA Smoke Detector + CO G = SA Smoke Detector + CO H = RA + SA Smoke Detector + CO

Sensor

Indoor Fan Options & Air Flow Configuration

1 = Standard Static / Vertical Supply, Return Air Flow 2 = Medium Static Option - Belt Drive 3 = High Static / Vertical Supply, Return Air Flow B = Med Static High Eff Motor / Vert Supply, Return Air Flow C = High Static High Eff Motor / Vert Supply, Return Air Flow 2 = Medium Static Option - Belt Drive 5 = Standard Static / Horizontal Supply, Return Air Flow 6 = Medium Static / Horizontal Supply, Return Air Flow 7 = High Static / Horizontal Supply, Return Air Flow F = Med Static Hi Eff Motor / Horizontal Supply, Return Air Flow G = High Static High Eff Motor / Horiz Supply, Return Air Flow

Factory Assigned

0 = Standard 3 = CA Seismic Compliant

Electrical Options

A = None B = HACR Breaker C = Non-Fused Disconnect G = 2-Speed Indoor Fan (VFD) Controller J = 2 Speed Fan Controller & Non-Fused Disconnect

Service Options

0 = None 1 = Unpowered Convenience Outlet 2 = Powered Convenience Outlet 3 = Hinged Panels 4 = Hinged Panels and Unpowered Convenience Outlet 5 = Hinged Panels and Powered Convenience Outlet C = Foil Faced Insulation

Intake / Exhaust Options

A = None B = Temperature Economizer w/ Barometric Relief F = Enthalpy Economizer w/ Barometric Relief K = 2-Position Damper U =

Temp Ultra Low Leak Economizer w/ Baro Relief V = Temp. Ultra Low LEak Econo w/PE (cent) Vert W =

Enthalpy Ultra Low Leak Economizer w/ Baro Relief X = Enthalpy Ultra Low Leak Econ w/P (cent) Vertical Air Only

Base Unit Controls

0 = Electromechanical Controls. Can be used with W7212 EconoMi$er IV (Non-Fault Detection and Diagnostic) 1 = PremierLink Controller 2 = RTU Open Multi-Protocol Controller 6 = Electro-mechanical Controls. Can be used with W7220 EconoMi$er X (with Fault Detection and Diagnostic) D = ComfortLink Controls

Coil Options (RTPF) (Outdoor - Indoor - Hail Guard)

A = Al/Cu - Al/Cu B = Precoat Al/Cu - Al/Cu C = E-coat Al/Cu - Al/Cu D = E-coat Al/Cu - E-coat Al/Cu E = Cu/Cu - Al/Cu F = Cu/Cu - Cu/Cu M = Al/Cu -Al/Cu — Louvered Hail Guard N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard R = Cu/Cu - Al/Cu — Louvered Hail Guard S = Cu/Cu - Cu/Cu — Louvered Hail Guard

Coil Options – Novation (Outdoor - Indoor - Hail Guard)

G = Al/Al - Al/Cu H = Al/Al - Cu/Cu J = Al/Al - E-coat Al/Cu K = E-coat Al/Al - Al/Cu L = E-coat Al/Al - E-coatAl/Cu T = Al/Al - Al/Cu — Louvered Hail Guard U = Al/Al - Cu/Cu — Louvered Hail Guard V = Al/Al - E-coat Al/Cu — Louvered Hail Guard

Design Revision

- Factory Design Revision

Voltage

1 = 575/3/60 5 = 208-230/3/60 6 = 460/3/60

C150380

APPENDIX II. PHYSICAL DATA

Table 12 – PHYSICAL DATA − VERTICAL (COOLING) 15 − 27.5 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D17 50TC-E17 50TC-D20 50TC-E20

Refrigeration System RTPF RTPF RTPF RTPF

# Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll

R-410a charge A/B (lbs) 16.3/17.5 25.9/25.7 16.3/17.5 25.9/25.7

Metering device Acutrol TXV Acutrol TXV

High-press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505

Low-press. Trip / Reset (psig) 54 / 117 27 / 44 54 / 117 27 / 44

Evap. Coil

Material Cu / Al Cu / Al Cu / Al Cu / Al

Tube Diameter 3/8" 3/8" 3/8" 3/8"

Rows / FPI 4 / 15 4 / 15 4 / 15 4 / 15

total face area (ft2) 22.00 22.00 22.00 22.00

Condensate drain conn. size 3/4" 3/4" 3/4" 3/4"

Humidimizer Coil

Material n/a Cu / Al n/a Cu / Al

Tube Diameter n/a 3/8" n/a 3/8"

Rows / FPI n/a 1 / 17 n/a 1 / 17

total face area (ft2) n/a 22.00 n/a 22.00

Evap. fan and motor

VERTICAL

Motor Qty / Belt Qty / Driver Type 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt

Standard

Static

Max BHP 2.2 2.2 3.3 3.3

RPM range 514-680 514-680 622-822 622-822

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15

Medium

Static

High

Static

High

Static-

High

Efficiency

Motor Qty / Belt Qty / Driver Type 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt

Max BHP 3.3 3.3 4.9 4.9

RPM range 679-863 679-863 713-879 713-879

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15

Motor Qty / Belt Qty / Driver Type 1 / 1 / Belt 1 / 1 / Belt n/a n/a

Max BHP 4.9 4.9 n/a n/a

RPM range 826-1009 826-1009 n/a n/a

motor frame size 56 56 n/a n/a

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal n/a n/a

Fan Diameter (in) 15 x 15 15 x 15 n/a n/a

Motor Qty / Belt Qty / Driver Type n/a n/a 1 / 1 / Belt 1 / 1 / Belt

Max BHP (208/230/460/575v) n/a n/a 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3

RPM range n/a n/a 882-1078 882-1078

motor frame size n/a n/a 184T 184T

Fan Qty / Type n/a n/a 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) n/a n/a 15 x 15 15 x 15

APPENDIX II. PHYSICAL DATA (CONT)

Table 12 - PHYSICAL DATA − VERTICAL (cont) (COOLING) 15 - 27.5 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D24 50TC-E24 50TC-D28 50TC-E28 50TC-D30 Refrigeration System RTPF RTPF RTPF RTPF RTPF

# Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll

R-410a charge A/B (lbs) 20.6/14.7 27.9/20.5 19.8/ 20.4 27.9/ 28.9 27.0/ 28.5

Metering device Acutrol TXV Acutrol TXV Acutrol

High-press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505 630 / 505

Low-press. Trip / Reset (psig) 54 / 117 27 / 44 54 / 117 27 / 44 54 / 117

Evap. Coil

Material Cu / Al Cu / Al Cu / Al Cu / Al Cu / Al

Tube Diameter 3/8" 3/8" 3/8" 3/8" 3/8"

Rows / FPI 4 / 15 4 / 15 4 / 15 4 / 15 4 / 15

total face area (ft2) 22.00 22.00 23.11 23.11 26

Condensate drain conn. size 3/4" 3/4" 3/4" 3/4" 3/4"

Humidimizer Coil

Material n/a Cu / Al n/a Cu / Al n/a

Tube Diameter n/a 3/8" n/a 3/8" n/a

Rows / FPI n/a 1 / 17 n/a 1 / 17 n/a

total face area (ft2) n/a 22.00 n/a 23.11 n/a

Evap. fan and motor

VERTICAL

Standard

Static

Motor Qty / Belt Qty

/ Driver Type

Max BHP 4.9 4.9 4.9 4.9 n/a

RPM range 690-863 690-863 717-911 717-911 n/a

motor frame size 56 56 56 56 n/a

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal n/a

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15 n/a

1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt n/a

Standard

Static -

High

Efficiency

Medium Static -

High

Efficiency

High

Static-

High

Efficiency

Motor Qty / Belt Qty

/ Driver Type

Max BHP n/a n/a n/a n/a 6.5/ 6.9/ 7.0/ 8.3

RPM range n/a n/a n/a n/a 751-954

motor frame size n/a n/a n/a n/a 184T

Fan Qty / Type n/a n/a n/a n/a 2 / Centrifugal

Fan Diameter (in) n/a n/a n/a n/a 15 x 15

Motor Qty / Belt Qty

/ Driver Type

Max BHP

(208/230/460/575v)

RPM range 835-1021 835-1021 913-1116 913-1116 920-1190

motor frame size 184T 184T 184T 184T 213T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15 15 x 15

Motor Qty / Belt Qty

/ Driver Type

Max BHP

(208/230/460/575v)

RPM range 941-1176 941-1176 941-1176 941-1176 1116-1400

motor frame size 213T 213T 213T 213T 215T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15 15 x 15

n/a n/a n/a n/a 1 / 1 / Belt

1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt

6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 10.5/11.9/11.9/11

1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 1 / Belt 1 / 2 Belt

10.5/11.9/11.9/11 10.5/11.9/11.9/11 10.5/11.9/11.9/11 10.5/11.9/11.9/11 11.9/12.9/12.9/14.1

APPENDIX II. PHYSICAL DATA (CONT)

Table 12 - PHYSICAL DATA − VERTICAL (cont) (COOLING) 15-27.5 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D17 50TC-E17 50TC-D20 50TC-E20 50TC-D24 50TC-E24 50TC-D28 50TC-E28 50TC-D30

Cond. Coil (Circuit A)

Coil type RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF

Coil Length (in) 70 70 70 70 82 82 75 75 95

Coil Height (in) 44 44 44 44 44 44 52 52 52

Rows / FPI 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17

total face area (ft2) 21.4 21.4 21.4 21.4 25.1 25.1 27.1 27.1 34.3

Cond. Coil (Circuit B)

Coil type RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF

Coil Length (in) 70 70 70 70 57 57 75 75 95

Coil Height (in) 44 44 44 44 44 44 52 52 52

Rows / FPI 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17

total face area (ft2) 21.4 21.4 21.4 21.4 17.4 17.4 27.1 27.1 34.3

Cond. fan / motor

Qty / Motor drive type 3 / direct 3 / direct 3 / direct 3 / direct 4 / direct 4 / direct 4 / direct 4 / direct 6 / direct

Motor HP / RPM 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100

Fan diameter (in) 22 22 22 22 22 22 22 22 22

Filters

RA Filter # / size (in)

OA inlet screen # / size

(in)

6 / 20 x 25

x 2

4 / 16 x 25

x 1

6 / 20 x 25

x 2

4 / 16 x 25

x 1

6 / 20 x 25

x 2

4 / 16 x 25

x 1

6 / 20 x 25

x 2

4 / 16 x 25

x 1

6 / 20 x 25

x 2

4 / 16 x 25

x 1

6 / 20 x 25

x 2

4 / 16 x 25

x 1

9 / 16 x 25

x 2

4 / 16 x 25

x 1

9 / 16 x 25

x 2

4 / 16 x 25

x 1

9 / 16 x 25

x 2

4 / 16 x 25

x 1

APPENDIX II. PHYSICAL DATA (CONT)

Table 12 - PHYSICAL DATA − VERTICAL (cont) (COOLING) 15-27.5 TONS Novation - All Aluminum Coil Design

50TC*17 50TC*20 50TC*24 50TC*28

Refrigeration System MCHX MCHX MCHX MCHX

# Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll

R-410a charge A/B (lbs) 9.5/12.0 9.5/12.0 14.4/12.5 12.5/13.0

Metering device Acutrol Acutrol Acutrol Acutrol

High-press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505

Low-press. Trip / Reset (psig) 54 / 117 54 / 117 54 / 117 54 / 117

Evap. Coil

Material Cu / Al Cu / Al Cu / Al Cu / Al

Tube Diameter 3/8" 3/8" 3/8" 3/8"

Rows / FPI 4 / 15 4 / 15 4 / 15 4 / 15

total face area (ft2) 19.56 19.56 22.00 23.11

Condensate drain conn. size 3/4" 3/4" 3/4" 3/4"

Evap. fan and motor

VERTICAL

Motor Qty / Belt Qty /

Standard

Static

Motor Qty / Belt Qty /

Medium

Static

Motor Qty / Belt Qty /

High

Static

Motor Qty / Belt Qty /

Medium Static -

High

Efficiency

Motor Qty / Belt Qty /

High

Static-

High

Efficiency

Driver Type

Max BHP 2.2 3.3 4.9 4.9

RPM range 514-680 622-822 690-863 717-911

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15

Driver Type

Max BHP 3.3 4.9 6.5 6.5

RPM range 679-863 713-879 835-1021 913-1116

motor frame size 56 56 184T 184T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15

Driver Type

Max BHP 4.9 6.5 8.7 8.7

RPM range 826-1009 882-1078 941-1176 941-1176

motor frame size 56 184T 213T 213T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 15 x 15 15 x 15 15 x 15 15 x 15

Driver Type

Max BHP

(208/230/460/575v)

RPM range n/a n/a 835-1021 913-1116

motor frame size n/a n/a 184T 184T

Fan Qty / Type n/a n/a 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) n/a n/a 15 x 15 15 x 15

Driver Type

Max BHP

(208/230/460/575v)

RPM range n/a 882-1078 941-1176 941-1176

motor frame size n/a 184T 213T 213T

Fan Qty / Type n/a 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) n/a 15 x 15 15 x 15 15 x 15

1 / 1 Belt 1 / 1 Belt 1 / 1 Belt 1 / 1 Belt

n/a n/a 1 / 1 Belt 1 / 1 Belt

n/a n/a 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3

n/a 1 / 1 Belt 1 / 1 Belt 1 / 1 Belt

n/a 6.5/ 6.9/ 7.0/ 8.3 10.5/11.9/11.9/11 10.5/11.9/11.9/11

APPENDIX II. PHYSICAL DATA (CONT)

Table 12 - PHYSICAL DATA − VERTICAL (cont) (COOLING) 15-27.5 TONS Novation - All Aluminum Coil Design

50TC*17 50TC*20 50TC*24 50TC*28

Cond. Coil (Circuit A)

Coil type Novation Novation Novation Novation

Coil Length (in) 70 70 82 75

Coil Height (in) 44 44 44 52

Number of Passes l Rows

total face area (ft2) 21.4 21.4 25.1 27.1

Cond. Coil (Circuit B)

Coil Length (in) 70 70 57 75

Coil Height (in) 44 44 44 52

total face area (ft2) 21.4 21.4 17.4 27.1

Cond. fan / motor

Qty / Motor drive type 3 / direct 3 / direct 4 / direct 4 / direct

Motor HP / RPM 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100

Fan diameter (in) 22 22 22 22

Filters

RA Filter # / size (in) 6 / 20 x 25 x 2 6 / 20 x 25 x 2 6 / 20 x 25 x 2 9 / 16 x 25 x 2

OA inlet screen # / size (in) 4 / 16 x 25 x 1 4 / 16 x 25 x 1 4 / 16 x 25 x 1 4 / 16 x 25 x 1

/ FPI

Coil type Novation Novation Novation Novation

Rows / FPI 2 2 2 2

2 2 2 2

APPENDIX II. PHYSICAL DATA (CONT)

TABLE 13 – PHYSICAL DATA − HORIZONTAL (COOLING) 15−25 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D18 50TC-E18 50TC-D21 50TC-E21 Refrigeration System

# Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll

R-410a charge A/B (lbs) 17/16.4 24.5/25.7 17.5/16.8 25.5/25.5

Metering device TXV TXV TXV TXV

High-press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505

Low-press. Trip / Reset (psig) 54 / 117 27 / 44 54 / 117 27 / 44

Material Cu / Al Cu / Al Cu / Al Cu / Al

Tube Diameter 3/8" RTPF 3/8" RTPF 3/8" RTPF 3/8" RTPF

Rows / FPI 4 / 15 4 / 15 4 / 15 4 / 15

total face area (ft2) 22 22 22 22

Condensate drain conn. size 3/4" 3/4" 3/4" 3/4"

Humidimizer Coil

Material n/a Cu / Al n/a Cu / Al

Tube Diameter n/a 3/8" RTPF n/a 3/8" RTPF

Rows / FPI n/a 1 / 17 n/a 1 / 17

total face area (ft2) n/a 22 n/a 22

Evap. fan and motor

HORIZONTAL

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt 1/1/ Belt 1/1/ Belt

Max BHP 2.2 2.2 3.3 3.3

Standard

Static

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt 1/1/ Belt 1/1/ Belt

Medium

Static

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt n/a n/a

High

Static

Motor Qty / Belt Qty / Driver Type n/a n/a 1/1/ Belt 1/1/ Belt

High

Static-

High Eff

RPM range 514-680 514-680 622-822 622-822

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11

Max BHP 3.3 3.3 4.9 4.9

RPM range 614-780 614-780 713-879 713-879

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11

Max BHP 4.9 4.9 n/a n/a

RPM range 746-912 746-912 n/a n/a

motor frame size 56 56 n/a n/a

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal n/a n/a

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 n/a n/a

Max BHP n/a n/a 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3

RPM range n/a n/a 882-1078 882-1078

motor frame size n/a n/a 184T 184T

Fan Qty / Type n/a n/a 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) n/a n/a 18 x 15/15 X 11 18 x 15/15 X 11

APPENDIX II. PHYSICAL DATA (CONT)

Table 13 PHYSICAL DATA − HORIZONTAL (cont) (COOLING) 15−25 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D25 50TC-E25 50TC-D29 50TC-E29 Refrigeration System

# Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll

R-410a charge A/B (lbs) 23.8/23.1 30.0/30.7 24.9/27.7 35.1/35.4

Metering device TXV TXV TXV TXV

High-press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505

Low-press. Trip / Reset (psig) 54 / 117 27 / 44 54 / 117 27 / 44

Material Cu / Al Cu / Al Cu / Al Cu / Al

Tube Diameter 3/8" RTPF 3/8" RTPF 3/8" RTPF 3/8" RTPF

Rows / FPI 4 / 15 4 / 15 4 / 15 4 / 15

total face area (ft2) 26 26 26 26

Condensate drain conn. size 3/4" 3/4" 3/4" 3/4"

Humidimizer Coil

Material n/a Cu / Al n/a Cu / Al

Tube Diameter n/a 3/8" RTPF n/a 3/8" RTPF

Rows / FPI n/a 1 / 17 n/a 1 / 17

total face area (ft2) n/a 26 n/a 26

Evap. fan and motor

HORIZONTAL

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt 1/1/ Belt 1/1/ Belt

Max BHP 4.9 4.9 4.9 4.9

Standard Static

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt 1/1/ Belt 1/1/ Belt

Medium Static

- High Eff.

Motor Qty / Belt Qty / Driver Type 1/1/ Belt 1/1/ Belt 1/1/ Belt 1/1/ Belt

High Static-

High Eff.

RPM range 690-863 690-863 647-791 647-791

motor frame size 56 56 56 56

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11

Max BHP 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3

RPM range 835-1021 835-1021 755-923 755-923

motor frame size 184T 184T 184T 184T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11

Max BHP 10.5/11.9/11.9/11 10.5/11.9/11.9/11 10.5/11.9/11.9/11 10.5/11.9/11.9/11

RPM range 941-1176 941-1176 827-1010 827-1010

motor frame size 213T 213T 213T 213T

Fan Qty / Type 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal 2 / Centrifugal

Fan Diameter (in) 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11 18 x 15/15 X 11

APPENDIX II. PHYSICAL DATA (CONT)

Table 13 PHYSICAL DATA − HORIZONTAL (cont) (COOLING) 15−25 TONS RTPF (Round Tube/Plate Fin Coil Design)

50TC-D18 50TC-E18 50TC-D21 50TC-E21 50TC-D25 50TC-E25 50TC-D29 50TC-E29

Cond. Coil (Circuit A)

Coil type RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF

Coil Length (in) 70 70 72 72 82 82 95 95

Coil Height (in) 44 44 44 44 52 52 52 52

Rows / FPI 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17

total face area (ft2) 21.4 21.4 22.0 22.0 29.6 29.6 34.3 34.3

Cond. Coil (Circuit B)

Coil type RTPF RTPF RTPF RTPF RTPF RTPF RTPF RTPF

Coil Length (in) 70 70 64 64 80 80 95 95

Coil Height (in) 44 44 44 44 52 52 52 52

Rows / FPI 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17 2 /17

total face area (ft2) 21.4 21.4 19.5 19.5 29.6 29.6 34.3 34.3

Cond. fan / motor

Qty / Motor drive type 3 / direct 3 / direct 4 / direct 4 / direct 4/ direct 4/ direct 6 / direct 6 / direct

Motor HP / RPM 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100 1/4 / 1100

Fan diameter (in) 22 22 22 22 22 22 22 22

Filters

RA Filter # /

size (in)

OA inlet screen # /

size (in)

6 /

20 x 25 x 2

4 /

16 x 25 x 1

6 /

20 x 25 x 2

4 /

16 x 25 x 1

6 /

20 x 25 x 2

4 /

16 x 25 x 1

6 /

20 x 25 x 2

4 /

16 x 25 x 1

9 /

16 x 25 x 2

4 /

16 x 25 x 1

9 /

16 x 25 x 2

4 /

16 x 25 x 1

9 /

16 x 25 x 2

4 /

16 x 25 x 1

9 /

16 x 25 x 2

4 /

16 x 25 x 1

APPENDIX III. FAN PERFORMANCE

Table 14 – 50TC*D17 VERTICAL SUPPLY / RETURN 15 TON

Available External Static Pressure (in. wg)

CFM

4500 436 0.60 530 0.90 611 1.22 684 1.57 751 1.94 4900 456 0.71 546 1.03 625 1.37 695 1.73 760 2.12 5250 473 0.83 560 1.16 637 1.51 706 1.89 770 2.30 5600 491 0.95 575 1.30 650 1.67 717 2.07 780 2.48 6000 513 1.11 593 1.48 665 1.87 731 2.28 792 2.71 6400 534 1.29 611 1.68 681 2.09 745 2.52 805 2.97 6750 553 1.46 628 1.87 696 2.29 758 2.74 817 3.20 7100 573 1.65 645 2.07 711 2.51 772 2.98 829 3.46 7500 595 1.88 665 2.33 729 2.79 788 3.27 844 3.77

CFM

4500 812 2.33 869 2.74 924 3.17 975 3.62 1024 4.08 4900 821 2.53 877 2.95 931 3.40 981 3.86 1030 4.34 5250 829 2.72 885 3.16 938 3.61 988 4.09 1036 4.57 5600 838 2.92 893 3.37 945 3.84 994 4.33 1042 4.83 6000 849 3.17 903 3.63 954 4.12 1003 4.62 1050 5.14 6400 861 3.43 914 3.92 964 4.42 1012 4.94 1058 5.47 6750 872 3.69 924 4.18 973 4.70 1021 5.23 1066 5.78 7100 883 3.95 934 4.47 983 5.00 1030 5.54 ---- ---7500 897 4.28 947 4.81 995 5.36 1041 5.92 ---- ----

Std Static Motor and Drive - 514-680 RPM, Max BHP 2.29 Medium Static Motor and Drive - 679-863 RPM, Max BHP 3.3 High Static Motor and Drive - 826-1009 RPM, Max BHP 4.9 ---- Outside operating range

Boldface - Field Supplied Drive ITALIC - Field Supplied Motor and Drive

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Table 15 – 50TC*D20 VERTICAL SUPPLY / RETURN 17.5 TON

Available External Static Pressure (in. wg)

CFM

5250 541 1.08 618 1.42 688 1.79 754 2.19 817 2.62 5700 573 1.31 645 1.67 712 2.06 775 2.48 835 2.93 6100 602 1.55 670 1.93 734 2.34 795 2.77 852 3.23 6500 631 1.81 696 2.21 757 2.64 815 3.09 871 3.57 7000 668 2.19 729 2.61 787 3.06 843 3.53 896 4.03 7500 706 2.62 763 3.06 819 3.54 871 4.03 922 4.55 7900 736 3.00 791 3.47 844 3.96 895 4.47 944 5.00 8300 767 3.42 819 3.90 870 4.41 919 4.94 967 5.49 8750 801 3.94 852 4.44 900 4.97 948 5.52 993 6.09

CFM

5250 876 3.08 932 3.56 986 4.07 1038 4.60 1088 5.15 5700 892 3.40 946 3.90 998 4.42 1049 4.96 1097 5.52 6100 907 3.72 960 4.23 1011 4.76 1060 5.31 1107 5.89 6500 924 4.07 975 4.59 1025 5.13 1072 5.70 1119 6.28 7000 947 4.55 996 5.09 1044 5.65 1090 6.23 1135 6.83 7500 971 5.08 1019 5.64 1064 6.22 1109 6.82 1152 7.44 7900 992 5.55 1038 6.13 1082 6.72 1126 7.34 ---- ---8300 1013 6.06 1057 6.65 1101 7.26 ---- ---- ---- ---8750 1038 6.68 1081 7.29 ---- ---- ---- ---- ---- ----

Std Static Motor and Drive - 622-822 RPM, Max BHP 3.3 Medium Static Motor and Drive - 713-879 RPM, Max BHP 4.9 High Static Motor and Drive - 882-1078 RPM, Max BHP 6.5 ---- Outside operating range

Boldface - Field Supplied Drive ITALIC - Field Supplied Motor and Drive

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

APPENDIX III. FAN PERFORMANCE (CONT)

Table 16 – 50TC*D24 VERTICAL SUPPLY / RETURN 20 TON

Available External Static Pressure (in. wg)

CFM

6000 506 1.12 593 1.43 668 1.74 736 2.07 798 2.40 6500 533 1.36 616 1.70 689 2.04 754 2.39 815 2.74 7000 561 1.64 640 2.01 710 2.37 774 2.74 833 3.11 7500 588 1.96 664 2.35 732 2.74 795 3.13 852 3.53 8000 617 2.32 689 2.74 755 3.15 816 3.57 872 3.99 8500 645 2.73 715 3.17 779 3.60 837 4.04 892 4.49 9000 674 3.18 741 3.64 803 4.10 860 4.57 913 5.04 9500 703 3.67 767 4.16 827 4.65 883 5.14 935 5.64

10000 732 4.22 794 4.74 852 5.25 906 5.77 957 6.29

CFM

6000 855 2.75 909 3.11 959 3.47 1008 3.85 1054 4.24 6500 871 3.11 924 3.48 974 3.87 1022 4.26 1067 4.67 7000 888 3.50 940 3.89 989 4.30 1036 4.71 1081 5.13 7500 906 3.94 957 4.35 1005 4.77 1052 5.20 1096 5.64 8000 925 4.42 975 4.85 1022 5.29 1068 5.74 1111 6.20 8500 944 4.94 993 5.40 1040 5.86 1084 6.33 1127 6.81 9000 964 5.51 1012 5.99 1058 6.48 1102 6.97 1144 7.46 9500 984 6.13 1032 6.64 1077 7.14 1120 7.65 1161 8.17

10000 1006 6.81 1052 7.33 1096 7.86 1138 8.40 ---- ----

Std Static Motor and Drive - 690-863 RPM, Max BHP 4.9 Medium Static Motor and Drive - 835-1021 RPM, Max BHP 6.5 High Static Motor and Drive - 941-1176 RPM, Max BHP 8.7 ---- Outside operating range

Boldface - Field Supplied Drive

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Table 17 – 50TC*D28 VERTICAL SUPPLY / RETURN 25 TON

Available External Static Pressure (in. wg)

CFM

7500 541 1.50 636 1.88 716 2.27 787 2.66 850 3.06 8000 563 1.76 656 2.17 735 2.58 804 3.00 867 3.42 8500 585 2.05 676 2.50 753 2.93 822 3.37 884 3.81 9000 608 2.37 697 2.85 772 3.31 840 3.77 901 4.24

9500 631 2.73 717 3.24 791 3.73 858 4.21 918 4.70 10000 654 3.12 738 3.66 811 4.18 876 4.69 936 5.20 10500 678 3.56 759 4.12 831 4.67 895 5.21 954 5.74 11000 701 4.02 781 4.62 851 5.20 914 5.76 972 6.33 11500 725 4.53 802 5.16 871 5.77 933 6.36 991 6.95 12000 748 5.09 824 5.75 892 6.38 953 7.00 1010 7.62 12500 772 5.68 846 6.38 912 7.04 973 7.69 1029 8.34

CFM

7500 909 3.47 963 3.89 1014 4.32 1062 4.77 1108 5.23

8000 925 3.85 978 4.29 1029 4.74 1077 5.20 1122 5.68

8500 941 4.26 994 4.72 1044 5.19 1092 5.67 1137 6.16

9000 957 4.71 1010 5.19 1060 5.67 1107 6.17 1152 6.68

9500 974 5.19 1027 5.69 1076 6.20 1123 6.72 1167 7.24 10000 991 5.72 1043 6.24 1092 6.77 1138 7.30 ---- ---10500 1009 6.28 1060 6.83 1109 7.37 1155 7.93 ---- ---11000 1026 6.89 1077 7.46 1125 8.03 1171 8.60 ---- ---11500 1044 7.54 1095 8.13 1142 8.72 ---- ---- ---- ---12000 1062 8.23 1112 8.85 ---- ---- ---- ---- ---- ---12500 ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

Std Static Motor and Drive - 717-911 RPM, Max BHP 4.9 Medium Static Motor and Drive - 913-1116 RPM, Max BHP 6.5 High Static Motor and Drive - 941-1176 RPM, Max BHP 8.7 ---- Outside operating range

Boldface - Field Supplied Drive

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

APPENDIX III. FAN PERFORMANCE (CONT)

Table 18 – 50TC−D30 VERTICAL SUPPLY / RETURN 27.5 TON

Available External Static Pressure (in. wg)

CFM

8250 620 1.85 705 2.31 778 2.77 843 3.22 903 3.68

8800 650 2.18 731 2.67 802 3.16 866 3.64 925 4.13

9350 679 2.54 758 3.07 828 3.59 890 4.10 948 4.62

9900 710 2.95 786 3.51 853 4.06 915 4.60 971 5.15 10450 740 3.40 814 3.99 879 4.57 939 5.15 995 5.73 11000 771 3.90 842 4.52 906 5.14 965 5.75 1020 6.35 11550 802 4.45 871 5.10 933 5.75 991 6.39 1044 7.03 12100 833 5.04 900 5.73 961 6.41 1017 7.09 1070 7.76 12650 865 5.70 930 6.42 989 7.13 1044 7.84 1095 8.54 13200 897 6.40 959 7.16 1017 7.90 1071 8.64 1121 9.38 13750 929 7.17 990 7.96 1046 8.74 1098 9.51 1148 10.27

CFM

8250 959 4.14 1011 4.61 1059 5.08 1106 5.56 1150 6.05

8800 980 4.62 1031 5.11 1080 5.61 1126 6.12 1169 6.63

9350 1002 5.14 1052 5.66 1100 6.18 1146 6.72 1189 7.25

9900 1024 5.70 1074 6.25 1121 6.80 1166 7.36 1209 7.92 10450 1047 6.30 1096 6.88 1143 7.47 1187 8.05 1230 8.64 11000 1071 6.96 1119 7.57 1165 8.18 1209 8.79 1251 9.41 11550 1095 7.66 1142 8.30 1188 8.94 1231 9.58 1273 10.23 12100 1119 8.42 1166 9.09 1211 9.76 1253 10.43 1295 11.10 12650 1144 9.24 1190 9.93 1234 10.63 1276 11.33 ---- ---13200 1169 10.10 1215 10.83 1258 11.56 1300 12.29 ---- ---13750 1195 11.03 1240 11.79 1282 12.55 ---- ---- ---- ----

Std Static Motor and Drive - 751-954 RPM, Max BHP 6.5 Medium Static Motor and Drive - 920-1190 RPM, Max BHP 10.5 High Static Motor & Drive - 1116-1400 RPM, Max BHP 11.9 ---- Outside operating range

Boldface - Field Supplied Drive ITALIC - Field Supplied Motor

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

APPENDIX III. FAN PERFORMANCE (CONT)

Table 19 – 50TC*D18 HORIZONTAL SUPPLY / RETURN 15 TON

Available External Static Pressure (in. wg)

CFM

4500 451 0.84 533 1.21 605 1.63 668 2.12 726 2.67 4900 476 1.01 554 1.40 623 1.84 685 2.34 742 2.89 5250 498 1.18 573 1.60 640 2.05 701 2.55 756 3.11 5600 520 1.37 593 1.82 658 2.28 717 2.79 771 3.35 6000 546 1.61 616 2.10 679 2.58 736 3.10 789 3.67 6400 572 1.88 640 2.41 700 2.91 756 3.45 808 4.03 6750 595 2.13 661 2.70 720 3.23 774 3.79 825 4.38 7100 619 2.41 683 3.02 740 3.59 793 4.16 842 4.76 7500 646 2.75 708 3.42 764 4.02 815 4.62 863 5.23

CFM

4500 778 3.25 826 3.86 871 4.49 913 5.15 ‐ ‐ 4900 794 3.49 842 4.12 887 4.78 ‐ ‐ ‐ ‐ 5250 808 3.72 856 4.36 900 5.04 ‐ ‐ ‐ ‐ 5600 822 3.97 870 4.62 ‐ ‐ ‐ ‐ ‐ ‐ 6000 839 4.29 886 4.96 ‐ ‐ ‐ ‐ ‐ ‐ 6400 857 4.65 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 6750 873 5.01 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 7100 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 7500 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐

Standard Static Motor and Drive – 514 – 680 RPM, Max BHP 2.2 Medium Static Motor and Drive – 614 – 780 RPM, Max BHP 3.3

High Static Motor and Drive – 746 – 912 RPM, Max BHP 4.9 – Outside operating range

Boldface - Field Supplied Drive ITALIC - Field Supplied Motor and Drive

ITALIC Boldface - Field Supplied Drive with Medium Static Motor

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Table 20 – 50TC*D21 HORIZONTAL SUPPLY / RETURN 17.5 TON

Available External Static Pressure (in. wg)

CFM

5250 498 1.18 573 1.60 640 2.05 701 2.55 756 3.11 5700 526 1.43 599 1.89 663 2.35 721 2.86 776 3.43 6100 552 1.67 622 2.17 684 2.66 741 3.18 794 3.76 6500 579 1.95 646 2.49 706 3.00 761 3.54 813 4.12 7000 612 2.33 677 2.93 734 3.48 788 4.05 837 4.64 7500 646 2.75 708 3.42 764 4.02 815 4.62 863 5.23 7900 673 3.13 734 3.86 788 4.50 838 5.12 884 5.75 8300 700 3.53 760 4.33 812 5.01 861 5.66 906 6.32 8750 731 4.03 789 4.90 840 5.63 887 6.33 932 7.02

CFM

5250 808 3.72 856 4.36 901 5.04 943 5.75 983 6.48 5700 826 4.05 874 4.71 918 5.40 960 6.13 1000 6.89 6100 843 4.38 890 5.05 934 5.75 976 6.50 1016 7.27 6500 861 4.75 907 5.43 951 6.14 992 6.90 1032 7.69 7000 885 5.28 929 5.96 972 6.69 1013 7.45 ‐ ‐ 7500 909 5.88 953 6.58 994 7.31 ‐ ‐ ‐ ‐ 7900 929 6.42 972 7.12 ‐ ‐ ‐ ‐ ‐ ‐ 8300 950 7.01 992 7.72 ‐ ‐ ‐ ‐ ‐ ‐ 8750 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐

Standard Static Motor and Drive – 622 – 822 RPM, Max BHP 3.3 Medium Static Motor and Drive – 713 – 879 RPM, Max BHP 4.9

High Static Motor and Drive – 882 – 1078 RPM, Max BHP 6.5 – Outside operating range

Boldface - Field Supplied Drive ITALIC - Field Supplied Motor and Drive

ITALIC Boldface - Field Supplied Drive with Medium Static Motor Underscore - Field Supplied Drive with High Static Motor

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

APPENDIX III. FAN PERFORMANCE (CONT)

Table 21 – 50TC*D25 HORIZONTAL SUPPLY / RETURN 20 TON

Available External Static Pressure (in. wg)

CFM

6000 546 1.57 617 2.10 680 2.67 738 3.29 790 3.93 6500 579 1.90 646 2.46 707 3.07 763 3.71 814 4.39 7000 613 2.28 677 2.87 735 3.51 789 4.19 839 4.89 7500 648 2.71 708 3.34 764 4.01 816 4.72 865 5.46 8000 683 3.20 740 3.86 794 4.57 846 5.30 892 6.08 8500 718 3.76 773 4.45 825 5.18 873 5.95 919 6.75 9000 754 4.37 814 5.10 856 5.87 903 6.67 947 7.50 9500 790 5.06 840 5.82 887 6.51 933 7.45 976 8.31

10000 826 5.82 874 6.50 920 7.44 965 8.30 ‐ ‐

CFM

6000 839 4.60 885 5.29 928 6.01 969 6.75 1008 7.51 6500 862 5.09 907 5.82 950 6.57 990 7.34 1028 8.13 7000 886 5.63 930 6.39 972 7.17 1012 7.97 1050 8.70 7500 911 6.22 954 7.01 995 7.83 1035 8.66 ‐ ‐ 8000 936 6.87 979 7.69 1019 8.54 ‐ ‐ ‐ ‐ 8500 965 7.58 1004 8.44 ‐ ‐ ‐ ‐ ‐ ‐ 9000 990 8.36 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 9500 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐

10000 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐

Standard Static Motor and Drive – 690 – 680 RPM, Max BHP 4.9 Medium Static Motor and Drive – 835 – 1021 RPM, Max BHP 6.5

High Static Motor and Drive – 941 – 1176 RPM, Max BHP 8.7 – Outside operating range

Boldface - Field Supplied Drive Underscore - Field Supplied Drive with High Static Motor

ITALIC Boldface - Field Supplied Drive with Medium Static Motor

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Table 22 – 50TC*D29 HORIZONTAL SUPPLY / RETURN 25 TON

Available External Static Pressure (in. wg)

CFM

7500 553 1.92 621 2.46 683 3.07 741 3.72 795 4.42 8000 575 2.21 639 2.77 700 3.39 756 4.07 809 4.78 8500 596 2.52 658 3.10 716 3.73 771 4.43 823 5.16 9000 616 2.86 675 3.44 732 4.10 786 4.80 836 5.55

9500 636 3.22 693 3.82 747 4.48 800 5.20 849 5.97 10000 656 3.60 710 4.21 763 4.89 813 5.62 862 6.40 10500 675 4.02 727 4.64 778 5.32 827 6.07 874 6.86 11000 694 4.46 744 5.09 793 5.79 841 6.50 887 7.34 11500 713 4.93 761 5.57 808 6.27 854 7.03 899 7.84

CFM

7500 845 5.14 892 5.90 936 6.68 978 7.48 1018 8.31

8000 859 5.53 905 6.31 949 7.11 991 7.94 ‐ ‐

8500 872 5.93 918 6.73 961 7.56 1003 8.41 ‐ ‐

9000 884 6.34 930 7.16 973 8.01 ‐ ‐ ‐ ‐

9500 896 6.77 941 7.61 984 8.48 ‐ ‐ ‐ ‐ 10000 908 7.22 953 8.08 ‐ ‐ ‐ ‐ ‐ ‐ 10500 920 7.69 963 8.56 ‐ ‐ ‐ ‐ ‐ ‐ 11000 931 8.18 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 11500 943 8.70 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐

Standard Static Motor and Drive – 647 – 791 RPM, Max BHP 4.9 Medium Static Motor and Drive – 755 – 923 RPM, Max BHP 6.5

High Static Motor and Drive – 827 – 1010 RPM, Max BHP 8.7 – Outside operating range

Boldface - Field Supplied Drive ITALIC Boldface - Field Supplied Drive with Medium Static Motor

0.2 0.4 0.6 0.8 1.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure (in. wg)

1.2 1.4 1.6 1.8 2.0

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

APPENDIX III. FAN PERFORMANCE (CONT)

Table 23 – Pulley Adjustment − Vertical

UNIT

NOTE: Do not adjust pulley further than 5 turns open.

MOTOR/DRIVE

COMBO

Standard Static 680 663 647 630 614 597 580 564 547 531 514

Medium Static 863 845 826 808 789 771 753 734 716 697 679

High Static 1009 991 972 954 936 918 899 881 863 844 826

Standard Static 822 802 782 762 742 722 702 682 662 642 622

Medium Static 879 862 846 829 813 796 779 763 746 730 713

High Static 1078 1058 1039 1019 1000 980 960 941 921 902 882

Standard Static 863 846 828 811 794 777 759 742 725 707 690

Medium Static 1021 1002 984 965 947 928 909 891 872 854 835

High Static 1176 1153 1129 1106 1082 1059 1035 1012 988 965 941

Standard Static 911 892 872 853 833 814 795 775 756 736 717

Medium Static 1116 1096 1075 1055 1035 1015 994 974 954 933 913

High Static 1176 1153 1129 1106 1082 1059 1035 1012 988 965 941

Standard Static 954 934 913 893 873 853 832 812 792 771 751

Medium Static 1190 1163 1136 1109 1082 1055 1028 1001 974 947 920

High Static 1400 1372 1343 1315 1286 1258 1230 1201 1173 1144 1116

- Factory settings

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

MOTOR PULLEY TURNS OPEN

Table 24 – Pulley Adjustment − Horizontal

UNIT

NOTE: Do not adjust pulley further than 5 turns open.

N/A - Not Available

MOTOR/DRIVE

COMBO

Standard Static 680 663 647 630 614 597 580 564 547 531 514

Medium Static 780 763 747 730 714 697 680 664 647 631 614

High Static 912 895 879 862 846 829 812 796 779 763 746

Standard Static 822 802 782 762 742 722 702 682 662 642 622

Medium Static 879 862 846 829 813 796 779 763 746 730 713

High Static 1078 1058 1039 1019 1000 980 960 941 921 902 882

Standard Static 863 846 828 811 794 777 759 742 725 707 690

Medium Static 1021 1002 984 965 947 928 909 891 872 854 835

High Static 1176 1153 1129 1106 1082 1059 1035 1012 988 965 941

Standard Static N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

Medium Static 923 906 889 873 856 839 822 805 789 772 755

High Static 1010 992 973 955 937 919 900 882 864 845 827

- Factory settings

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

MOTOR PULLEY TURNS OPEN

APPENDIX IV. WIRING DIAGRAMS

Table 25 – Wiring Diagrams

50TC−D17 / 50TC−D30 UNITS

DUAL CIRCUIT HUMIDI-MIZER[

SIZE VOLTAGE CONTROL POWER CONTROL POWER

208/230-3-60 50HE500887-K 50HE500894-I 50HE502180-E

D17

D20

D24

D28

D30

ALL PremierLink* 50HE500891-F 50HE500891-F

ALL RTU-Open* 50HE501687-B 50HE501687-B

ALL SAV/VFD 50HE502975-C 50HE502975-C

460-3-60 50HE500887-K 50HE500895-I 50HE502180-E

575-3-60 50HE500887-K 50HE500895-I 50HE502180-E

208/230-3-60 50HE500887-K 50HE500894-I 50HE502180-E

460-3-60 50HE500887-K 50HE500895-I 50HE502180-E

575-3-60 50HE500887-K 50HE500895-I 50HE502180-E

208/230-3-60 50HE500887-K 50HE500894-I 50HE502180-E

460-3-60 50HE500887-K 50HE500895-I 50HE502180-E

575-3-60 50HE500887-K 50HE500895-I 50HE502180-E

208/230-3-60 50HE500887-K 50HE500894-I 50HE502180-E

460-3-60 50HE500887-K 50HE500895-I 50HE502180-E

575-3-60 50HE500887-K 50HE500895-I 50HE502180-E

208/230-3-60 50HE502337-D 50HE500894-I 50HE502180-E

460-3-60 50HE502335-D 50HE500895-I 50HE502180-E

575-3-60 50HE502335-D 50HE500895-I 50HE502180-E

50HE502185-B

50HE502182-C

50HE501774-C

50HE502185-B

50HE502182-C

50HE501774-C

50HE502185-B

50HE502182-C

50HE501774-C

50HE502185-B

50HE502182-C

50HE501774-C

50HE502185-B

50HE502182-C

50HE501774-C

NOTE: Component arrangement on Control; Legend on Power Schematic.

* PremierLink and RTU-OPEN control labels overlay a portion of the base unit control label. The base unit label drawing and

the control option drawing are required to provide a complete unit control diagram.

APPENDIX IV. WIRING DIAGRAMS

Fig. 57 − 50TC D17 − D28 Control Diagram − 208/230−3−60; 460/575−3−60

C150425

APPENDIX IV. WIRING DIAGRAMS

Fig. 58 − 50TC D30 Control Diagram − 208/230−3−60

C150370

APPENDIX IV. WIRING DIAGRAMS

Fig. 59 − 50TC D30 Control Diagram − 460/575−3−60

C150368

APPENDIX IV. WIRING DIAGRAMS

Fig. 60 − 50TC D17 − D30 Power Diagram − 208/230−3−60

C150373

APPENDIX IV. WIRING DIAGRAMS

Fig. 61 − 50TC D17 − D30 Power Diagram 460/575−3−60

C12399

APPENDIX IV. WIRING DIAGRAMS

Fig. 62 − 50TC D17 − D30 Control Diagram 208/230−3−60; 460/575−3−60 with Humidi−MiZer®

C150375

APPENDIX IV. WIRING DIAGRAMS

Fig. 63 − 50TC D17 − D30 Power Diagram 208/230−3−60 with Humidi−MiZer®

C150376

APPENDIX IV. WIRING DIAGRAMS

Fig. 64 − 50TC D17 − D30 Power Diagram 460−3−60 with Humidi−MiZer®

C150378

APPENDIX IV. WIRING DIAGRAMS

Fig. 65 − 50TC D17 − D30 Power Diagram 575−3−60 with Humidi−MiZer®

C150379

APPENDIX IV. WIRING DIAGRAMS

Fig. 66 − 50TC − PremierLinkt System Control Wiring Diagram

C12690

APPENDIX IV. WIRING DIAGRAMS

Fig. 67 − 50TC − RTU−OPEN Wiring Diagram

C12691

APPENDIX IV. WIRING DIAGRAMS

Fig. 68 − 50TC − SAV − VFD System Control Wiring Diagram

C12689A

APPENDIX V. MOTORMASTER SENSOR LOCATIONS

SENSOR

LOCATION

Fig. 69 − Motormaster Sensor Locations − D17, D20, and D24

SENSOR

LOCATION

C12258

Fig. 70 − Motormaster Sensor Location − D28

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

C12259

Catalog No: 50TC-17-30-01SM

Replaces: 50TC-4SM

UNIT START-UP CHECKLIST

I. PRELIMINARY INFORMATION:

MODEL NO.:

DATE: ______________

SERIAL NO: _____________________________________

TECHNICIAN: ___________________________________

II. PRE-START-UP (insert check mark in box as each item is completed):

 VERIFY THAT JOBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE

 VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT

 REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS

 VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS

 VERIFY THAT FLUE HOOD IS INSTALLED

 CHECK REFRIGERANT PIPING FOR INDICATIONS OF LEAKS; INVESTIGATE AND REPAIR IF NECESSARY

 CHECK GAS PIPING FOR LEAKS

 CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

 CHECK THAT RETURN (INDOOR) AIR FILTERS ARE CLEAN AND IN PLACE

 VERIFY THAT UNIT INSTALLATION IS LEVEL

 CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS

 CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTACT WITH REFRIGERANT LINES OR

SHARP METAL EDGES

 VERIFY PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS

III. START-UP (REFER TO UNIT SERVICE/MAINTENANCE MANUAL FOR INSTRUCTIONS)

ELECTRICAL

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1

CIRCUIT 1 COMPRESSOR AMPS L1

CIRCUIT 2 COMPRESSOR AMPS L1 L2 L2

INDOOR FAN AMPS L1 L2 L2

OUTDOOR FAN AMPS NO. 1 NO. 2

L2 L2

TEMPERATURES

OUTDOOR-AIR TEMPERATURE DB WB

RETURN-AIR TEMPERATURE

COOLING SUPPLY AIR

GAS HEAT SUPPLY AIR

DB WB

PRESSURES

GAS INLET PRESSURE IN. WG

GAS MANIFOLD PRESSURE

REFRIGERANT SUCTION, CIRCUIT 1

REFRIGERANT SUCTION, CIRCUIT 2

REFRIGERANT DISCHARGE, CIRCUIT 1

IN. WG (LOW FIRE) IN. WG (HI FIRE)

PSIG F

REFRIGERANT DISCHARGE, CIRCUIT 2

 VERIFY THAT 3−PHASE FAN MOTOR AND BLOWER ARE ROTATING IN CORRECT DIRECTION  VERIFY THAT 3−PHASE SCROLL COMPRESSOR IS ROTATING IN CORRECT DIRECTION  VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS

GENERAL

 SET ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO MATCH JOB REQUIREMENTS

(IF EQUIPPED)

PSIG F

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 50TC-17-30-01SM

Replaces: 50TC-4SM

Carrier 50TC-D17, 50TC-E20, 50TC-E17, 50TC-D20, 50TC-D24 Service And Maintenance Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual