Carrier 50HC Series, 50HC08, 50HC09, 50HC11, 50HC12 Service And Maintenance Instructions

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50HC Single Package Rooft op Electric Cooling Unit with Puron (R---410A) Refrigerant 3 to 12.5 Nominal Tons (Sizes 04---14)

Service and Maintenance Instructions

TABLE OF CONTENTS

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

UNIT ARRANGEMENT AND ACCESS 2...........

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

STAGED AIR VOLUME CONTROL --2 SPEED FAN

WITH VARIABLE FREQUENCY DRIVE (VFD) 7....

ADDITIONAL VARIABLE FREQUENCY DRIVE (VFD) INSTALLATION AND TROUBLESHOOTING. 8

MOTOR 8......................................

COOLING 12...................................

THERMOSTATIC EXPANSION VALVE (TXV) 14....

PURONR (R--410A) REFRIGERANT 15.............

COOLING CHARGING CHARTS 17................

COMPRESSOR 21...............................

CONVENIENCE OUTLETS 24....................

SMOKE DETECTORS 25.........................

SENSOR AND CONTROLLER TESTS 29...........

PROTECTIVE DEVICES 32.......................

PREMIERLINK CONTROL 33...................

RTU--OPEN CONTROL SYSTEM 33................

SENSORY/ACCESSORY INSTALLATION 34........

ADDITIONAL RTU--OPEN INSTALLATION AND

TROUBLESHOOTING 34.........................

ECONOMIZER UNITS 36........................

PRE-- START --UP/START- -UP 44....................

START--UP, GENERAL 45........................

START--UP, PREMIERLINK CONTROLS 46.......

START--UP, RTU--OPEN CONTROLS 46............

FASTENER TORQUE VALUES 47.................

APPENDIX I. MODEL NUMBER SIGNIFICANCE 48.

APPENDIX II. PHYSICAL DATA 49................

APPENDIX III. FAN PERFORMANCE 52...........

APPENDIX IV WIRING DIAGRAMS 71............

APPENDIX V. MOTORMASTER SENSOR

LOCATIONS 121................................

UNIT STAR T-UP CHECKLIST 124.................

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 ot her 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 and unbrazing operations.

Read these instructions thoroughly and follow all warnings or cautions attached to t he unit. Consult local building codes and National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety ALERT

symbol 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 indicates 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 propert y 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.

. When you see this symbol on the unit and in

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning c ould re sult in personal injury or death.

Before performing service or maintenance operati ons on unit, LOCK--OUT/TAGOUT the main power switch to unit. Electrical shock and rotating equipment could cause severe injury.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning c ould re sult in personal injury or death.

50HC

Units with convenience outlet circuits can use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate the disconnect switch and lock it in the open position it. LOCK--OUT/TAGOUT this switch to notify others.

WARNING

UNIT OPERATION AND SAFETY HAZARD

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

Puron (R--410A) refrigerant systems operate at higher pressures than standard R--22 systems. Do not use R--22 service equipment or components on Puron refrigerant equipment.

WARNING

FIRE, EXPLOSION HAZARD

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

Never use non--certified refrigerants in this product. Non--certified refrigerants could contain contaminates that could lea d to unsafe operating conditions. Use ONLY refrigerants that conform to AHRI Standard

700.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may 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 increa se airside pressure drop.

NOTICE

OPERATIONAL TEST ALERT

Failure to follow this ALERT can 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.

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in death, serious 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 lea d to an explosion.

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 service personnel that the power is disconnected.

UNIT ARRANGEMENT AND

ACCESS

General

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

FILTER ACCESS PANEL

OUTDOOR-AIR OPENING AND INDOOR COIL ACCESS PANEL

Fig. 1 -- Typical Access Panel Locations

COMPRESSOR ACCESS PANEL (04-07 only)

C08449

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)

S Return air filter replacement

S Outdoor hood inlet filters cleaned

S Belt tension and condition checked

S Pulley alignment checked

S Fan shaft bearing locking collar tightness checked

S Condenser coil cleanliness checke d

S Condensate drain checked

Seasonal Maintenance

50HC

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

COMPRESSOR

CONTROL BOX

(08-09 only)

Fig. 2 -- Blower Access Panel Location

BLOWER ACCESS PANEL

C160062

Air Conditioning

S Condenser fan motor mounting bolts tightness

S Compressor mounting bolts

S Condenser fan blade positioning

S Control box cleanliness and wiring condition

S Wire terminal tightness

S Refrigerant charge level using chart

S Evaporator coil cleaning

S Evaporator blower and condenser motor amperage

Economizer or Outside Air Damper

S Inlet filters condition

S Check damper travel (economizer)

S 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.

SUPPLY FAN (BLOWER) SECTION

WARNING

ELECTRICAL SHO CK HAZARD

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

Before performing service or maintenance operations on unit, LOCK--OUT/TAGOUT the main power switch to unit. Electrical shock and rotating equipment could cause severe injury.

connected to motor terminals L and N (see Fig. 4 and Fig. 5); ground is connected at terminal G. The motor power voltage is ALWAYS present; it is not switched off by a motor contactor.

YEL

Com BRN

BLU

Gnd

GRN/YEL

LGN

Motor Power Connections

Supply Fan (Direct--Drive)

For unit sizes 04, 05 and 06, a direct--drive forward-- curved centrifugal blower wheel is an available option. The motor has taps to provide the servicer with the selection of one of five motor torque/speed ranges to best

50HC

match wheel performance with attached duct system. See Fig. 3 and Fig. 4 .

Motor Plug Position

(95° from vertical)

ECM Motor

Fig. 3 -- Direct-- Drive Supply Fan Assembly

ECM Motor — The direct--drive motor is an X13

Electronically Commutated Motor (ECM). An ECM motor contains electronic circuitry used to convert single--phase line AC voltage into 3--phase DC voltage to power the motor circuit. The motor circuit is a DC brushless design with a permanent ma gnet rot or. On the X13 ECM Motor design, the electronic circuitry is integral to the motor assembly and cannot be serviced or replaced separately.

208/230V units use a 230V motor. 460V units use a 230V motor with a stepdown transformer (mounted on the end of the fan housing, see Fig. 3). 575V units use a 460V motor with an autotransformer. Motor power voltage is

95°

ECM Power Transformer (460, 575v)

C09260

Speed

Taps

12345

VIO Default Connection

C09261

Fig. 4 -- ECM Motor Connectors

Evaluating motor speed — The X13 ECM Motor uses a

constant torque motor design. The motor speed is adjusted by the motor control circuitry to maintain the programmed shaft torque. Consequently there is no specific speed value assigned to each control tap setting. At the Position 5 tap, the motor speed is approximately 1050 RPM (17.5 r/s) but varies depending on fan wheel loading.

Selecting speed tap — The five communication terminals are each programmed to provide a different motor torque output. See Table 1. Factory default tap selection is Position 1 for lowest torque/speed operation.

Table 1 – Motor Tap Programing

(percent of full--load torque)

Unit Size Ta p 1 Ta p 2 Ta p 3 Ta p 4 Ta p 5

04 32 38 45 50 100 05 46 58 61 69 100 06 73 82 85 90 100

Factory Default: Tap 1 (VIO)

Selecting another speed:

1. Disconnect main power to the unit. Apply lockout/tagout procedures.

2. Remove the default motor signal lead (VIO) from terminal 1 at the motor communications terminal.

3. Reconnect the motor signal lead to the desired speed (terminals 1 through 5).

4. Connect main power to the unit.

460, 575-v Units

208/230-v Units

Fig. 5 -- Direct-- Drive Supply Fan Assembly

50HC

C09260

Motor “rocking” on start--up — When the motor first starts, the rotor (and attached wheel) will “rock” back and forth as the motor tests for rotational direction. Once the correct rotational direction is determined by the motor circuitry, the motor will ramp up to the specified speed. The “rocking” is a normal operating characteristic of ECM mot ors.

Troubleshooting the ECM motor — Troubleshooting the X13 ECM requires a voltmeter.

1. Disconnect main power to the unit.

2. Remove the motor power plug (including the control BRN lead) and VIO control signal lead at the motor terminals.

3. Restore main unit power.

4. Check for proper line voltage at motor power leads BLK (at L terminal) and YEL (at N terminal). See Table 2.

Table 2 – Motor Test Volts

Unit Voltage Motor Voltage Min ---Max Volts

208/230 230 190---250

460 230 210--- 250 575 460 420--- 500

5. Using a jumper wire from unit control terminals R to G, engage motor operation. Check for 24v output at the defrost board terminal IFO.

6. Check for proper control signal voltages of 22V to 28V at motor signal leads VIO and BRN.

7. Disconnect unit main power. Apply lockout/tagout procedures.

8. Reconnec t motor power and control signal leads at the motor terminals.

9. Restore unit main power.

10. The motor should start and run. If the motor does not start, remove the motor assembly. Replace the motor with one having the same part number. Do not substitute with an alternate design motor as the torque/ speed programming will not be the same as that on an original factory motor.

Replacing the X--13 ECM Motor — Before removing the ECM belly--band mounting ring from old motor:

1. Measure the distance from base of the motor shaft to the edge of the mounting ring.

2. Remove the motor mounti ng band and transfer it to the replacement motor.

3. Position the mounting band at the same distance that was measured in Step 1.

4. Hand--tighten mounting bolt only. Do not tighten securely at this time.

5. Insert the m otor shaft into t he fan wheel hub.

6. Securely tighten the three motor mount arms to the support cushions and torque the arm mounting screws to 60 in--lbs (6.8 Nm).

7. Center the fan wheel in the fan housing. Tighten the fan wheel hub setscrew and torque to 120 in--lbs (13.6 Nm).

8. Ensure the motor terminals are located at a position below the 3 o’clock position (see Fig. 3). Tighten the motor belly--band bolt and torque to 80 in--lbs (9.0 Nm).

Supply Fan (Belt--Drive)

The belt--drive supply fan system consists of a forward--curved centrifugal blower wheel on a solid shaft with two concentric type bearings, one on each side of the

blower housing. A fixed--pitch driven pulley is attached to the fan shaft and an adjustable--pitch driver pulley is on the motor. The pulleys are connected using a V--belt. (See Fig. 6.).

BLOWER PULLEY

V --- B E LT

MOTOR PULLEY

MOTOR

MOUNTING

BOLTS (4)

MOTOR MOUNTING

PLATE

50HC

Fig. 6 -- Typical Belt Drive Motor Mounting

Belt

Check the belt condition and tension quarterly. Inspect the belt for signs of cracki ng, 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

/8--in (1.6 cm). deflection when measured at the centerline 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.

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 (1.3 cm) deflection is reached. See Fig. 7.

Adjust belt tension by loosening the motor mounting plate front and rear bolts and sliding the plate toward the fan (to reduce tension) or away from fan (to increase tension). Ensure the blower shaft and the motor shaft are parallel to each other (pulleys aligned). When finished, tighten all bolts and torque to 65--70 in--lb (7.4 to 7.9 Nm).

C11504

/2-- i n .

STRAIGHTEDGE

BROWNING BELT TENSION CHECKER

1/2”

(1.3 cm)

BELT

DEFLECTION

C12025

Fig. 7 -- Checking Blower Motor Belt Tension

Replacing the Belt:

NOTE: Use a belt with same section type or similar size.

Do not substitute a FHP--type belt. When installing the new belt, do not use a tool (screwdriver or pry--bar) to force the belt over the pulley flanges, this will stress the belt and cause a reduction in belt life. Damage to the pulley can also occur.

Use the following steps to replace the V--belt. See Fig. 6.

1. Loosen the front and rear motor mounting plate bolts.

2. Push the motor and its mounting plate towards the blower housing as c lose as possible to reduce the center distance between fan shaft and motor shaft.

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

4. Install the new belt by gently sliding the belt over both pulleys and then sliding the motor and plate away from the fan housing until proper tension is achieved.

CAUTION

EQUIPMENT DAMAGE HAZARD

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

Do not use a screwdriver or a pry bar to pl ace 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.

5. Check the alignment of the pulleys, adjust if necessary.

6. Tighten all bolts and torque to 65--70 in--lb (7.4 to 7.9 Nm).

7. Check the tension after a few hours of runtime and re--adjust as required.

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. 8.)

FAN PULLEY

MOTOR AND

FANSHAFTS

MUST BE

PARALLEL

MOTOR PULLEY

STRAIGHT EDGE MUST BE PARALLEL WITH BELT

SETSCREWS

FIXED FLANGE

SINGLE - GROOVE

MOVABLE

FLANGE

C07075

Fig. 8 -- Supply--Fan Pulley Adjustment

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 can be necessary.

LOCKING COLLAR

T --- 2 5 T O R X S O C K E T

HEAD CAP SCREW

C11505

Fig. 9 -- Tightening Locking Collar

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 re alignment of the pulleys after any adjustment of the movable flange. Reset the belt tension after each realignment.

Inspect 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. Replace pulley if wear is excessive.

Changing the Fan Speed:

1. Shut off unit power supply. Use proper lockout/tagout procedures.

2. Loosen belt by l oosening fan motor mounting nuts. (See Fig. 6.)

3. Loosen movable pulley fla nge setscrew. (See Fig. 8.)

4. Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motor. Do not exceed the maximum specified speed.

5. Set movable flange at nearest keyway of pulley hub. Tighten setscrew and torque to 65--70 in--lb (7.4 to 7.9 Nm).

Aligning Blower and Motor Pulleys:

1. Loosen blower pulley setscrews.

2. Slide blower pul ley along blower shaft. Make angular alignment by loosening motor mounting plate front and rear bolts.

3. Tighten blower pulley setscrews and motor mounting bolts. Torque bolts to 65--70 in--lb (7.4 to 7.9 Nm).

4. Rechec k belt tension.

Bearings

The fan system uses bearings featuring concentric split locking collars. A Torx T--25 socket head cap screw is used to tighten the loc king collars. Tighten the locking collar by holding it tightly against the inner race of the bearing. Tighten the socket head cap screw. Torque cap screw to 65--70 in--lb (7.4--7.9 Nm). See Fig. 9. Check the

STAGED AIR VOLUME CONTROL --

2 SPEED FAN WITH VARIABLE

FREQUENCY DRIVE (VFD)

Staged Air Volume (SAV) Indoor Fan Speed System

The Staged Air Volume (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. Per 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.

Identifying Factory Option

This supplement only applies to units that mee t the criteria detailed in Table 3. If the unit does not meet that criteria, discard this document.

Table 3 – Model--Size / VFD Option Indicator

Model / Sizes

50HC / 08 --- 28 17 G, J

Position in

Model Number

NOTE: See Fig. 57 for an example of Model Number Nomenclature.

Unit Installation with SAV Option

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

VFD FIOP

Indicator

50HC

NOTE: The Remote VFD Keypad is a field--installed option. It is not included as part of the Factory installed VFD option. See “Variable Frequency Drive (VFD) Installation, Setup and Troubleshooting Suppleme nt” for wiring schematics and performance charts and configuration.

See Figs 10, 11 and 12 for locations of the Variable Frequency Drive (VFD) as mounted on the various 50HC models.

VARIABLE

50HC

FREQUENCY

DRIVE (VFD)

Fig. 10 -- VFD Location for size 08--09

VARIABLE

FREQUENCY

DRIVE (VFD)

Fig. 11 -- VFD Location for size 12

C11528

C11529

ADDITIONAL VARIABLE FREQUENCY

DRIVE (VFD) INSTALLATION AND

TROUBLESHOOTING

Additional installation, wiring and troubleshooting information for the Variable Frequency Drive can be found in the following manuals: “Variable Frequency

Drive (VFD) Installation, Setup and Troubleshooting Supplement.”

MOTOR

When replacing the motor, use the following steps. See Fig. 13.

BLOWER PULLEY

V-B ELT

MOTOR PULLEY

MOTOR

MOTOR MOUNTING BRACKET BOLTS (4)

JACK BOLT JAM NUT (2)

JACK BOLT (2)

Fig. 13 -- Replacing Belt Driven Motor

Replacing the Motor

Use the following steps to replace the belt--driven motor.

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

2. Remove cover on 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 two jack bolts counterclockwise until motor assembly moves closer to blower pulley.

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

MOTOR MOUNTING BRACKET (2)

C12034

VARIABLE

FREQUENCY

DRIVE (VFD)

Fig. 12 -- VFD Location for size 14

C11530

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 washers and four nuts attaching the motor mounting

plate to the unit. Discard all lock washers.

9. Remove motor and motor mounting bracket from unit.

10. Remove four bolts, flat washers, lock washers and single external--tooth lock washer attaching motor to the motor mounting plate. Discard all lock washers and external--tooth lock washer.

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

12. Slide motor mounting band from old motor.

13. Slide motor mounting band onto new motor and set motor onto the motor mounting plate.

14. Remove variable pitch pulley from old motor and attach it to the new motor.

15. Inspect variable pitch pulley for cracks and wear. Replace the pulley if necessary.

16. Secure the pulley to the motor by tightening the pulley setscrew to the motor shaft.

17. Insert four bolts and flat washers through mounting holes on the motor 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. Ensure the teeth of the external--tooth lock washer make contact with the painted ba se of the motor. This washer is essential for properly grounding motor.

20. Install four new lock washers and four nuts on the bolts on the bottom of the motor mounting plate.

21. Do Not tighten the mounting bolts at this time.

22. Set new motor and motor mounting bracket back onto the unit. See Fig. 13.

23. Install four bolts, four flat washers, four new lock washers and four nuts attaching the motor assembly to the unit.

24. Do Not tighten the mounting bolts at this time.

25. Install motor drive V--belt to motor pulley and blower wheel pulley. See CAUTION.

26. Align the motor pulley and blower wheel pulley using a straight edge. See Fig. 8.

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

28. Turn two jac k bolts cl ockwise, moving the motor assembly away from the blower pulley, increasing the V--belt tension.

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

30. Remove cover on motor c onnection box.

31. Re--connect all electrical leads to the motor and replace the connection box cover.

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

33. Start unit and allow to run for a designated period.

34. Shut off unit and make any necessary adjustments to the V--belt tension or the motor and blower wheel pulley alignment.

When replacing the motor, also replace the external --tooth lock washer (star washer) under t he motor mounting base; this is part of the motor grounding system. Ensure the

teeth on the lock washer are in contact with the motor’s painted base. Tighten motor mounting bolts to 120  12 in--lbs.

Changing Fan Wheel Speed

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 fan pulley (larger pitch diameter to reduce wheel speed, smaller pitch diameter to increase wheel speed) or select a new system (both pulleys and matching belt).

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 fa n 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.

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.

50HC

Decel

(2203)

Accel

(2202)

Decel

Accel/

(2201)

Fcn

Stop

(2102)

Fcn

Start

(2101)

Freq

(2606)

Switch

Max

Freq

(2008)

Min

Freq

(2007)

REMOTE VFD KEYPAD REFERENCE

Table 4 – SRT Unit VFD Parameters — 50HC** 08--12

Motor

Max

Relay

Const

Nom

Amps

Out 3

Speed 3

Speed 2

Speed 1

Speed Sel

RPM

Freq

Amps

(2003)

(1403)

(1204)

(1203)

(1202)

(1201)

(9909)

(9908)

(9907)

(9906)

6.7 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

3.3 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

3.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

9.1 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

4.1 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

4.4 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

Alarm

16 FLT/

4.8 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

10.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

6.2 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

13.5 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

5.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

7.4 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

15.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

6.9 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

50HC

(9905)

Volt age

Par t

Motor

Number

ABB Part Number Description

Par t

VFD

Number

HK30WA352 ACH550--- U0--- 012A---2 1.7 HP 230V HD56FR233 230 5.8 60Hz 1725 1.7 DI 2 ,3 40Hz 60Hz 60Hz

HK30WA356 A CH 5 5 0 --- U 0 --- 0 6 A 9 --- 4 1.7 HP 460V HD56FR463 460 2.9 60Hz 1725 1.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA360 A CH 5 5 0 --- U 0 --- 0 3 A 9 --- 6 1.7 HP 575V HD56F R 579 575 3.1 60Hz 1725 1.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA352 ACH550--- U0--- 012A---2 2.4 HP 230V HD56FE653 230 7.9 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA356 A CH 5 5 0 --- U 0 --- 0 6 A 9 --- 4 2.4 HP 460V HD56F E653 460 3.6 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA360 A CH 5 5 0 --- U 0 --- 0 3 A 9 --- 6 2.4 HP 575V HD56F E577 575 3.8 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA352 ACH550--- U0--- 012A---2 2.9 HP 230V HD58FE654 230 9.2 60Hz 1725 2.9 DI 2,3 40Hz 60Hz 60Hz

HK30WA356 A CH 5 5 0 --- U 0 --- 0 6 A 9 --- 4 2.9 HP 460V HD58F E654 460 4.2 60Hz 1725 2.9 DI 2,3 40Hz 60Hz 60Hz

HK30WA353 ACH550--- U0--- 017A---2 3.7 HP 230V HD60FE656 230 11.7 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA357 A CH 5 5 0 --- U 0 --- 0 8 A 8 --- 4 3.7 HP 460V HD60F E656 460 5.4 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA361 A CH 5 5 0 --- U 0 --- 0 6 A 1 --- 6 3.7 HP 575V HD58F E577 575 4.9 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA354 ACH550--- U0--- 024A---2 5.3 HP 230V HD60FK658 230 13.6 60Hz 1740 5.3 DI 2,3 40Hz 60Hz 60Hz

HK30WA358 ACH550--- U0--- 012A---4 5.3 HP 460V HD60FK658 460 6.4 60Hz 1740 5.3 DI 2,3 40Hz 60Hz 60Hz

HK30WA362 A CH 5 5 0 --- U 0 --- 0 9 A 0 --- 6 5.3 HP 575V HD60F E576 575 6.0 60Hz 1725 5.3 DI 2,3 40Hz 60Hz 60Hz

Decel

(2203)

Accel

(2202)

Decel

Accel/

(2201)

Fcn

Stop

(2102)

Fcn

Start

(2101)

Freq

(2606)

Switch

Max

Freq

(2008)

Min

Freq

(2007)

50HC

REMOTE VFD KEYPAD REFERENCE (CONT)

Max

Relay

Const

Nom

Motor

Table 5 – SRT Unit VFD Parameters — 50HC** 14

Nom

Amps

Out 3

Speed 3

Speed 2

Speed 1

Speed Sel

RPM

Freq

Amps

(2003)

(1403)

(1204)

(1203)

(1202)

(1201)

(9909)

(9908)

(9907)

(9906)

9.1 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

4.1 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

4.4 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

Alarm

16 FLT/

4.8 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

10.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

6.2 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

13.5 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

5.6 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

9.9 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

19.7 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

8.7 0Hz 60Hz 4kHz Auto Ramp Not Sel 30 sec 30 sec

Alarm

16 FLT/

(9905)

Volt age

Par t

Motor

Number

ABB Part Number Description

Par t

VFD

Number

HK30WA352 ACH550--- U0--- 012A---2 2.4 HP 230V HD56FE653 230 7.9 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA356 A CH 5 5 0 --- U 0 --- 0 6 A 9 --- 2 2.4 HP 460V HD56F E653 460 3.6 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA360 A CH 5 5 0 --- U 0 --- 0 3 A 9 --- 6 2.4 HP 575V HD56F E577 575 3.8 60Hz 1725 2.4 DI 2,3 40Hz 60Hz 60Hz

HK30WA352 ACH550--- U0--- 012A---2 2.9 HP 230V HD58FE654 230 9.2 60Hz 1725 2.9 DI 2,3 40Hz 60Hz 60Hz

HK30WA356 A CH 5 5 0 --- U 0 --- 0 6 A 9 --- 4 2.9 HP 460V HD58F E654 460 4.2 60Hz 1725 2.9 DI 2,3 40Hz 60Hz 60Hz

HK30WA353 ACH550--- U0--- 017A---2 3.7 HP 230V HD60FE656 230 11.7 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA357 A CH 5 5 0 --- U 0 --- 0 8 A 8 --- 4 3.7 HP 460V HD60F E656 460 5.4 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA361 A CH 5 5 0 --- U 0 --- 0 6 A 1 --- 6 3.7 HP 575V HD58F E577 575 4.9 60Hz 1725 3.7 DI 2,3 40Hz 60Hz 60Hz

HK30WA354 ACH550--- U0--- 024A---2 5.0 HP 230V HD60FL 657 230 17.1 60Hz 1760 5 DI 2,3 40Hz 60Hz 60Hz

HK30WA358 ACH550--- U0--- 012A---4 5.0 HP 460V HD60FL 657 460 8.6 60Hz 1760 5 DI 2,3 40Hz 60Hz 60Hz

HK30WA362 A CH 5 5 0 --- U 0 --- 0 9 A 0 --- 6 5.0 HP 575V HD60F K577 575 7.6 60Hz 1745 5 DI 2,3 40Hz 60Hz 60Hz

COOLING

WARNING

UNIT OPERATION AND SAFETY HAZARD

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

This system uses PuronR 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 designe d to handle Puron refrigerant. If unsure about equipment, consult the equipment manufacturer.

Condenser Coil

The condenser coil is fabricated with round tube coppe r hairpins and plate fins of various materials and/or coatings

50HC

(see Model Number Format in the Appendix to identify the materials provided in this unit). The coil may be one--row or composite--type two--row. Composite t wo--row coils are two single--row coils fabricated with a single return bend end tubesheet.

Condenser Coil Maintenance and Cleaning Recommendation

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.

Routine Cleaning of Coil Surfaces

Periodic cleaning with TotalineR environmental ly sound coil cleaner is essential to extend the life of coils. This cleaner is available from Replacement Components Division as part number P902--0301 for a one gallon container, and part number P902--0305 for a 5 gallon 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 proc edures to ensure long life of the coil. Failure to clean the coils may result in reduced durability in the environment.

Avoid use of:

S coil brighteners

S acid cleaning prior to painting

S high pressure washers

S poor quality water for cleaning

Totaline environmentally sound coil cleaner is nonflammable, hypo allergenic, non bacterial, and a 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.

One--Row Coil

Wash coil with commercial coil cleaner. It is not necessary to remove top panel.

Two--Row Coils

Remove 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 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 appli ed in coastal or industrial e nvironments. 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. Rinsing coils in the opposite direction of airflow is recommende d.

Clean coil as follows:

1. Turn off unit power, tag disconnect.

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

3. Remove condenser coil corner post. See Fig. 14. To hold top panel open, place coil corner post between top panel and center post. See Fig. 15.

C08205

Fig. 14 -- Cleaning Condenser Coil

Fig. 15 -- Propping Up Top Panel

4. Remove screws securing coil to compressor plate and compressor access panel.

5. Remove fastener holding coil sections together at return end of condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 16.

Fig. 16 -- Separating Coil Sections

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

7. Secure inner and outer coil rows together with a field--supplied fastener.

8. 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 replace all screws.

Totaline Environmentally Sound Coil Cleaner Application Equipment

S 2--1/2 gallon garden sprayer

S Water rinse with low velocity spray nozzle

CAUTION

UNIT DAMAGE HAZARD

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

C08206

C08207

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in accelerated corrosion of unit parts.

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.

Totaline Environmentally Sound Coil Cleaner Application Instructions

1. Proper eye protection such as safety glasses is recommended during mixing and application.

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 ve locity garden hose, being careful not to bend fins.

4. Mix Totaline environmentally sound coil cleaner in a 2--1/2 gallon garden sprayer according to the instructions included with the cleaner. The optimum solution temperature is 100_F.

NOTE: Do NOT USE water in excess of 130_F, 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 garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up--and--down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage.

7. Ensure cleaner thoroughly penetrates dee p into finned areas.

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

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

10. Ensure surfaces are not allowed to dry before rinsing. Reapplying cleaner as needed to ensure 10--minute saturation is achieved.

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

Evaporator Coil

Cleaning the Evaporator Coil

1. Turn unit power off. Install lockout tag. Remove evaporator coil access panel.

2. If economizer or two--position damper is installed, remove economizer by disconnecting Molex plug and removing mounting screws.

3. Slide filters out of unit.

50HC

4. Clean coil using a commercial coil cleaner or dishwasher detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, back--flush toward return--air section to remove foreign material. Flush condensate pan after completion.

5. Reinstall economizer and filters.

6. Reconnec t wiring.

7. Replace access panels.

THERMOSTATIC EXPANSION

VALVE (TXV)

All 50HC’s 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 PuronR or R-22 refrigerant, use only factory authorized TXVs. Do not interchange Puron and R-22 TXVs.

50HC

TXV Operation

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

6. Install the new TXV using a wrench and an additional wrench on connections to prevent damage to tubing while attaching TXV to distributor.

7. Attach the equalizer tube to the suction line. If the coil has mechanical a connection, then use a wrench and an additional wrench on connections to prevent damage. If the coil has a brazed connection, use a file or a tubing cutter to remove the mechanical flare nut from the equalizer line. Then use a new coupling to braze the equalizer line to t he stub (previous equalizer line) in suction line.

8. Attach TXV bulb in the same location where the original (in the sensing bulb indent) was when it was removed, using the supplied bulb clamps. See Fig. 17.

THERMAL EXPANSION (TXV) VALVE

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

1. Superheat temperature is sensed by cap tube sensing bulb on suction tube at 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 e xternal equalizer tube to the underside of the diaphragm.

3. The pin is spring loaded, which exerts pressure on the underside of the diaphragm. Therefore, the bulb pressure works against the spring pressure and evaporator suction pressure to open the valve. If the load increases, the temperature increases at the bulb, which increases the pressure on the top side of the diaphragm. This opens the valve and increases the flow of refrigerant. The increased refrigerant flow causes the leaving evaporator temperature to decrease. This lowers the pressure on the diaphragm and closes the pin. The refrigerant flow is effectively stabilized to the load demand with negligible change in superheat.

Replacing TXV

CLAMP

TXV SENSING

BULB

SENSING BULB INSULATION REMOVED FOR CLARITY

C10372

Fig. 17 -- TXV Valve and Sensing Bulb Location

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

10. Sweat the inlet of TXV marked “IN” to the liquid line. Avoid excessive heat which could damage the TXV valve. Use quenching cloth when applying heat anywhere on TXV.

Refrigerant System Pressure Access Ports

1. Recover refrigerant.

2. Remove TXV support clamp using a 5/l6-in. nut driver.

3. Remove TXV using a wrench and an additional wrench on connections to prevent damage to tubing.

4. Remove equalizer tube from suction line of coil. Use file or tubing cutter to cut brazed equalizer line approximately 2 i nches above suction tube.

5. Remove bulb from vapor tube inside cabinet.

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. 18. 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 val ve core without having to recover the entire system refrigerant charge. Apply compressor refrigerant oil to the check valve core’s bottom o--ring. Install the fitting body with 96  10 in--lbs (10.85  1.1 Nm) of torque; do not overtighten.

PURONR (R--410A) REFRIGERANT

This unit is designed for use with Puron (R-- 410A) refrigerant. Do not use any other refrigerant in this system. Puron (R--410A) refrigerant is provided in pink (rose) colored cylinders.

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 t op) when removing liquid refrigerant for charging. For a cylinder without a dip tube, invert the cylinder (access valve on the bottom) when removing 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. 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.

Refrigerant Charge

No Charge

Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant.

Low--Charge Cooling

Using Cooling Charging Charts, Fig. 19 through Fig. 26, vary refrigerant until the conditions of the appropriate chart are met. Note the charging charts are different from type normally used. Charts are based on charging the units to the correct sub--cooling for the various operating conditions. Accurate pressure gauge and temperature sensing device are required. Connect the pressure gauge to the service port on the liquid line. Mount the temperature sensing device on the liquid line and insulate it so that outdoor ambient temperature does not affect the reading. Indoor--air cfm must be within the normal operating range of the unit.

SIZE DESIGNATION NOMINAL TONS

04 3 05 4 06 5 07 6 08 7.5 09 8.5 12 10 14 12.5

REFERENCE

EXAMPLE:

Model 50HC*A04

Outdoor Temperature 85_F(29_C)..................

Suction Pressure 140 psig (965 kPa).................

Suction Temperature should be 60_F(16_C)..........

50HC

Amount of refrigerant charge is listed on the unit’s nameplate. Refer to Carrier GTAC2-- 5 Charging,

Recovery, Recycling and Reclamation training manual and the following procedures.

Unit panels must be in place when unit is operating during the charging procedure.

Using Cooling Charging Charts

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

SEAT

CORE

(Part No. EC39EZ067)

1/2-20

5/8” HEX

UNF RH

.47

0.596

WASHER

O-RING

This surface provides a metal to metal seal when

1/2” HEX

DEPRESSOR PER ARI 720 +.01/-.035 FROM FACE OF BODY

7/16-20 UNF RH

torqued into the seat. Appropriate handing is required to not scratch or dent the surface.

C08453

Fig. 18 -- CoreMax Access Port Assembly

50HC

COOLING CHARGING CHARTS

50HC

Fig. 19 -- Cooling Charging Charts -- 3 Ton

C14053

C14054

Fig. 20 -- Cooling Charging Chart -- 4 Ton

COOLING CHARGING CHARTS (cont.)

50HC

Fig. 21 -- Cooling Charging Chart -- 5 Ton

CHARGING CHART - R410A REFRIGERANT

160

) F seerge

140

D (

,erutare

120

p me

100

T gniv

a eL li

o C r

o o d t uO

150 200 250 300 350 400 450 500 550 600

COOLING MODE-ALL OUTDOOR FANS MUST BE RUNNING

Add Charge if Above the Curve

Remove Charge if Below the Curve

Compressor Discharge Pressure, [psig]

48TM502680 rev. -

Fig. 22 -- Cooling Charging Chart -- 6 Ton

C14055

C14056

COOLING CHARGING CHARTS (cont.)

CHARGING CHART - R410A REFRIGERANT

160

s eergeD( ,erutare

140

120

pmeT

100

gniv

aeL

lioC roodt

COOLING MODE-ALL OUTDOOR FANS MUST BE RUNNING

Add Charge if Above the Curve

Remove Charge if Below the Curve

150 200 250 300 350 400 450 500 550 600

Compressor Discharge Pressure, [psig]

Fig. 23 -- Cooling Charging Chart -- 7.5 Ton

CHARGING CHART - R410A REFRIGERANT

160

) F seergeD( ,erutare

140

120

pme

100

T gniv

a eL

l ioC

roodt

u O

COOLING MODE-ALL OUTDOOR FANS MUST BE RUNNING

Add Charge if Above the Curve

Remove Charge if Below the Curve

50HC

48TM502681 rev. -

C14059

150 200 250 300 350 400 450 500 550 600

Compressor Discharge Pressure, [psig]

48TM502682 rev. -

C14060

Fig. 24 -- Cooling Charging Chart -- 8.5 Ton

COOLING CHARGING CHARTS (cont.)

50HC

Fig. 25 -- Cooling Charging Chart -- 10 Ton

12.5 TON HC CKT A CHARGING CHART

140

120

100

OUTDOOR COIL LEAVING TEMPERATURE, [Degrees F]

ADD CHARGE IF ABOVE THE CURVE

150 200 250 300 350 400 450 500 550 600

(COOLING MODE ONLY) (R410A REFRIGERANT)

REMOVE CHARGE IF BELOW THE CURVE

COMPRESSOR DISCHARGE PRESSURE, [psig]

12.5 TON HC CKT B CHARGING CHART

140

120

100

OUTDOOR COIL LEAVING TEMPERATURE, [Degrees F]

ADD CHARGE IF ABOVE THE CURVE

150 200 250 300 350 400 450 500 550 600

(COOLING MODE ONLY) (R410A REFRIGERANT)

REMOVE CHARGE IF BELOW THE CURVE

COMPRESSOR DISCHARGE PRESSURE, [psig]

50TM501188

C14057

Fig. 26 -- Cooling Charging Chart -- 12.5 Ton -- Circuit A and B

C14058

COMPRESSOR

Lubrication

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

CAUTION

INSTALLATION SITE DAMAGE

Failure to follow this caution can result in damage to equipment location site.

CAUTION

UNIT DAMAGE HAZARD

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

The compressor is in a PuronR refrigerant system and uses a polyolester (POE) oil. Thi s 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.

WARNING

FIRE, EXPLOSION HAZARD

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

Never use air or gases containing oxyge n 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, serious personal injury and/or property damage.

700.

Replacing Compressor

NOTE: Only factory--trained service techni cians should

remove and replace compressor units.

Puron (R--410A) refrigerant contains polyolester (POE) oil that can damage the roof membrane. Caution should be taken to prevent POE oil from spilling onto the roof surface.

The factory also recommends that the suction and discharge lines be cut with a tubing cutter instead of using a torch to remove brazed fittings.

Compressor Rotation

CAUTION

EQUIPMENT DAMAGE

Failure to follow this caution can result in equipment damage.

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

NOTE: When the compressor is rotating in the wrong direction, the unit makes an elevated level of noise and does 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 whe ther 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 star t--up.

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

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

5. Turn off power to the unit.

6. Reverse any two of the three unit power leads.

7. Reapply electrical power to the compressor.

8. The suction pressure should drop and the discharge pressure should rise which is normal for scroll compressors on start--up.

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

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

50HC

Filter Drier

Replace whenever refrigerant system is exposed to atmosphere. Only use factory specified liquid--line filter driers with working pressures no less than 650 psig. 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.

Condenser--Fan Adjustment

Conduit

0.14 in + 0.0 / -0.03

C08448

Fig. 27 -- Condenser Fan Adjustment

1. Shut off unit power supply. Install lockout tag.

2. Remove condenser--fan assembly (grille, m otor, and fan).

3. Loosen fan hub setscrews.

4. Adjust fan height as shown in Fig. 27.

5. Tighten setscrews.

6. Replac e condenser--fan assembly.

50HC

Troubleshooting Cooling System

Refer to Table 6 for additional troubleshooting topics.

Table 6 –

PROBLEM CAUSE REMEDY

Compressor and Outdoor Fan Will Not Start.

Compressor Will Not Start But Outdoor Fan Runs.

Compressor Cycles (Other Than Normally Satisfying Thermostat).

Compressor Operates Continuously.

Compressor Makes Excessive Noise.

Excessive Head Pressure.

Head Pressure Too L o w.

Excessive Suction Pressure.

Suction Pressure Too L o w.

Power failure. Call power company.

Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Determine root cause.

Defective thermostat, contactor, transformer, control relay, or capacitor.

Insufficient line voltage. Determine cause and correct.

Incorrect or f aulty wiring. Check wiring diagram and rewire correctly.

Thermostat setting too high. Lower thermostat setting below room temperature.

High pressure switch tripped. See problem ‘‘Excessive head pressure.’’

Low pressure switch tripped. Check system for leaks. Repair as necessary.

Freeze-up protection thermostat tripped. See problem ‘‘Suction pressure too low.’’

Fault y wiring or loose connectio ns in compressor circuit.

Compressor motor burned out, seized, or internal overload open.

Defective run/start capacitor, overload, start relay.

Onelegof3-phasepowerdead. Replace fuse or reset circuit breaker. Determine cause.

Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge to nameplate.

Defective compressor. Replace and determine cause.

Insufficient line voltage. Determine cause and correct.

Blocked outdoor coil or dirty air filter. Clear or clean coil. Replace filter.

Defective run/start capacitor, overload, or start relay.

Defective thermostat. Replace thermostat.

Faulty outdoor-fan (cooling) or indoor-fan (heating) motor or capacitor.

Restriction in refrigerant system. Locate restriction and remove.

Dirty air filter. Replace filter.

Unit undersized for load. Decrease load or increase unit size.

Thermostat set too low (cooling). Reset thermostat.

Low refrigerant charge. Locate leak; repair and recharge.

Air in system. Recover refrigerant, replace filter dryer, evacuate system, and

Outdoor coil dirty or restricted. Clean coil or remove restriction.

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

Dirty outside air or return air filter (heating). Replace filter.

Dirty outdoor coil (cooling). Clean coil.

Refrigerant overcharged. Recover excess refrigerant.

Air in system. Recover refrigerant, replace filter dryer, evacuate system, and

Condensing air restricted or air short-cycling. Determine cause and correct.

Low refrigerant charge. Check for leaks; repair and recharge.

Compressor scroll plates defective. Replace compressor.

Restrictioninliquidtube. Remove restriction.

High heat load. Check for source and eliminate.

Compressor scroll plates defective. Replace compressor.

Refrigerant overcharged. Recover excess refrigerant.

Dirty air filter (cooling). Replace filter.

Dirty or heavily iced outdoor coil (heating). Clean outdoor coil. Check defrost cycle operation.

Low refrigerant charge. Check for leaks; repair and recharge.

Metering device or low side restricted. Remove source of restriction.

Insufficient indoor airflow (cooling mode). Increase air quantity. Check filter an d replace if necessary.

Temperature too low in conditioned area. Reset thermostat.

Field-installed filter drier restricted. Rep lace.

Outdoor ambient below 25_F (cooling). Install low-ambient kit.

Outdoor fan motor(s) not operating (heating). Check fan motor operation.

Cooling Troubleshooting

Replace component.

Check wiring and repair or replace.

Determine cause. Replace compressor or allow enough time for internal overload to cool and reset.

Determine cause and replace defective component.

Determine cause and replace.

Replace.

recharge.

Start-Up.

recharge.

50HC

CONVENIENCE OUTLETS

TOP

WET LOCATIONS

WET

LOCA

T I ONS

WARNING

ELECTRICAL O PERATION 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.

Convenience Outlets: Two type s of convenience outlets are offered on 50HC models: Non--powered and

unit--powered. Both types provide a 125VAC Ground--Fault Circuit--Interrupt (GFCI) duplex receptacle rated at 15A behind a hinged waterproof access cover,

50HC

located on the end panel of the unit. See Fig. 28.

PWD-CO TRANSFORMER

CONVENIENCE

OUTLET GFCI

2. Loosen the two screws at the GFCI duplex outlet,

until approximately

/2-in (13 mm) under screw heads

are 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. 29.

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

6. Check cover installation for full closing a nd latching.

GFCI RECEPTACLE

COVER - WHILE-IN-USE

WEATHERPROOF

NOT INCLUDED

PWD-CO FUSE SWITCH

CONTROL BOX ACCESS PANEL

Fig. 28 -- Convenience Outlet Location

Installing Weatherproof Cover: A weatherproof

while-in-use cover for the factory installed convenience outlets is now required by UL standards. This cove r cannot be factory-mounted due its depth. The cover must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

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

NOTE: DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET. Use approved lockout/tagout procedures.

1. Remove the blank cover plate at the conveni ence outlet; discard t he blank cover.

C08128

GASKET

BASEPLATE FOR

GFCI RECEPTACLE

C09022

Fig. 29 -- Weatherproof Cover Installation

Non--powered type: This type requires the fiel d

installation of a general--purpose 125--volt 15--A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location. Route 125--v power supply conductors into the bottom of the utility box containing the duplex receptacle.

Unit--powered type: A unit--mounted transformer is factory--installed t o step--down 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. 28.

The primary leads to the convenience out let transformer are not factory--connected. Selection of primary power source is a customer-- option. If local codes permit, the transformer primary leads can be connected at the line--side terminals on a unit--mounted non--fused disconnect or Heating, Air Conditioning and Refrigeration (HACR) breaker switch; this will provide service power to the unit when the unit disconnect switch or HACR switch is open. Other connection methods will result in the convenience outlet circuit being de--energized when the unit disconnect or HACR switch is open. See Fig. 30.

SMOKE DETECTORS

Smoke detectors are available as factory--instal led options on 50HC 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 configura tions only. All c omponents 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.

System

CO8283

Fig. 30 -- Powered Convenience Outlet Wiring

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

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 15A loading for continuous duty loads (such as electric heaters for overnight use). Observe a 50% limit on circuit loading above 8A (i.e., limit loads exceeding 8A to 30 minutes of operation every hour).

Maintenance: Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle. This should cause the internal circuit of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition.

Fuse on powered type: The factory fuse is a Bussmann Fusetron T--15, non--renewable screw--in (Edison base) type plug fuse.

Using unit--mounted convenience outlet s: 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.

The smoke detector system consists of a four--wire controller and one or two sensors. Its primary function is to shut down the rooftop unit in order to prevent smoke from circulating throughout the building. It is not to be used as a life saving device.

Controller

The controller (see Fig. 31) includes a controller housing, a printed circuit board, and a clear plastic cover. The controller can be connected to one or two compatible duct smoke sensors. The clear plastic cover is secured to the housing with a single captive screw for easy access to the wiring terminals. The controller has three LEDs (for Power, Trouble and Alarm) and a manual test/reset button (on the cover face).

DUCT SMOKE SENSOR

CONTROLLER

CONDUIT NUTS (SUPPLIED BY INSTALLER)

CONDUIT SUPPORT PLATE

CONTROLLER HOUSING

AND ELECTRONICS

CONDUIT COUPLINGS

(SUPPLIED BY INSTALLER)

FASTENER (2X)

ALARM

Fig. 31 -- Controller Assembly

TERMINAL BLOCK COVER

COVER GASKET (ORDERING OPTION)

TROUBLE

POWER

TEST/RESET SWITCH

CONTROLLER COVER

C08208

50HC

Smoke Detector Sensor

The Smoke Detector Sensor (see Fig. 32) includes a plastic housing, a printed circuit board, a clear plastic cover, a sampling tube inlet and an exhaust tube. The sampling tube (when used) and exhaust tube are attached during installation. The sampling tube varies in length depending on the size of the rooftop unit. The clear plastic cover permits visual inspections without having to disassemble the sensor. The cover attaches to the sensor housing using four captive screws and forms an airtight chamber around the sensing electronics. Each sensor includes a harness with an RJ45 terminal for connecting to the controller. Each sensor has four LEDs (for Power, Trouble, Alarm and Dirty) and a manual te st/reset button (on the left--side of the housing).

Air is introduced to the duct smoke detector sensor’s sensing chamber through a sampling tube that extends into the HVAC duct and is directed back into the ventilation

50HC

system through a (shorter) exhaust tube.

The difference in air pressure between the two tubes pulls the sampled air t hrough 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 blowe rs, change over air handling systems, notify the fire alarm control panel, etc.

The sensor uses a process called differential sensing to prevent gradual environmental changes from triggering false alarms. A rapid change in environmental conditions, such as smoke from a fire, causes the sensor to signal an alarm state but dust and debris accumulated over time does not.

SEE DETAIL A

INTAKE

GASKET

(ORDERING OPTION)

PLUG

SAMPLING TUBE (ORDERED SEPARATELY)

DETAIL

MAGNETIC

TEST/RESET

SWITCH

TSD-CO2

EXHAUST TUBE

COUPLING

TROUBLE

EXHAUST GASKET

ALARM

DUCT SMOKE SENSOR

SENSOR HOUSING AND ELECTRONICS

POWER DIRTY

COVER GASKET (ORDERING OPTION)

SENSOR COVER

C08209

Fig. 32 -- Smoke Detector Sensor

Smoke Detector Locations

Supply Air: The Supply Air Smoke Detector Sensor is

located to the left of the unit’s indoor (supply) fa n. See Fig. 33. 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.

For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an alarm or trouble c ondition.

SUPPLY AIR

SMOKE DETECTOR

C08245

Fig. 33 -- Typical Supply Air Smoke Detector Sensor

Location

Return Air Smoke Detector Sensor without Economizer: The sampling tube is located across the

return air opening on the unit basepan. See Fig. 34. 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. (Thi s 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 below.)

RETURN AIR DETECTOR MODULE (Shipping position shown)*

Completing Installation of Return Air Smoke Detector:

FLEXIBLE EXHAUST TUBES

SCREWS

CONTROLLER MODULE

RETURN AIR DETECTOR SAMPLING TUBE

*RA detector must be moved from shipping

position to operating position by installer

C07307

Fig. 34 -- Typical Return Air Smoke Detector Location

Return Air Smoke Detector Sensor with Economizer:

The sampling tube is inserted through the side plates of the economizer housing, placing it across the return air opening on the unit basepan. See Fig. 35. The holes in the sampling tube face downward, into the return air stream. The sampling tube is connected using tubing to the return air sensor mounted on a bracket high on the partition between return filter and controller location. The sensor is shipped in a flat--mounting location. Installation requi res the sensor be relocated to its operating location and the tubing to the sampling tube be connected. See installation steps below.

SAMPLE TUBE

C12049

Fig. 36 -- Return Air Smoke Detector Module

Shipping Position

Use the following steps to complete the installation of the Return Air Smoke Detector.

1. Unscrew the two screws holding the Return Air Sensor Detector plate. See Fig. 36. Save the screws.

2. Remove the Return Air Smoke Sensor Module and its detector plate.

3. Rotate the detector plate so the sensor is facing outwards and the sampling tube connection is on the bottom. See Fig. 37.

4. Screw the sensor and detector plate into its operating position using screws from Step 1. Ensure the sampling tube connection is on the bottom and the exhaust tube is on the top. See Fig. 37.

5. Connect the flexible tube on the sampling inlet to the sampling tube on the basepan.

6. For units with an economizer, the sampling tube is integrated into the economizer housing but connecting the flexible tubing to the sampling tube is the same.

RETURN AIR SENSOR

(Operating Position Shown)

50HC

Fig. 35 -- Return Air Sampling Tube Location

(View is reoriented to show opposite side for clarity.)

RETURN AIR SAMPLING TUBE

C08129

C12050

Fig. 37 -- Return Air Sensor Operating Position

FIOP Smoke Detector Wiring and Response

All units: FIOP smoke detector is configured to automatically shut down all unit operations when a smoke condition is detected. See Fig. 38, Smoke Detector Wiring.

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

Highlight B: Smoke detector NC contact set will open on smoke al arm condition, de--energizing the ORN conductor.

Highlight C: 24V power signal using the ORN lead is removed at the Smoke Detector input on LCTB; all unit operations cease immediately.

PremierLink and RTU--OPEN Controls: Unit operating functions (fan, cooling and heating) are terminated as described above. In addition:

50HC

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

Highlight E: GRA lead at Smoke Alarm input on LCTB provides 24--v signal to FIOP DDC control .

Premier--Link: 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 connected CCN network.

RTU--OPEN: The 24--v signal is conveyed to RTU--OPEN -- J1--10 input terminal. This signal initiates the FSD sequence by the RTU--OPEN control. FSD sta tus is reported to connected BAS network.

Using Remote Logic: Five conductors are provided for field use (see Highlight F) for additional annunciation functions.

Additional Application Data: Refer to Catalog No. HKRNKA--1XA for discussions on additional control features of these smoke detectors including multiple unit coordination. See Fig. 38.

Fig. 38 -- Typical Smoke Detector System Wiring

C08246

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.

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 ALERT

Failure to follow this ALERT can 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 magne t 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 ALERT

Failure to follow this ALERT can 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 7.

NOTICE

50HC

NOTICE

OPERATIONAL TEST ALERT

Failure to follow this ALERT can 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.

OPERATIONAL TEST ALERT

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

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

Table 7 – Dirty L E D Te st

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 ALERT

Failure to follow this ALERT can 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

50HC

By default, sensor dirty test results are indicated by:

S The sensor’s Dirty LED flashing. S The controller’s Trouble LED flashing. S 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 until the sensor’s Alarm LED turns on and its Dirty LE D flashes twice (approximately 60 seconds).

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

Remote Station Test

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

NOTICE

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. 39 and configured to operate the controller’s supervision relay. For more information, see “Changing sensor dirty test operation.”

upe

contacts [3]

ire must be

added by installer

ision relay

TB3

Smoke Detector Controller

−

equipment

18 Vdc ( )

−

Auxiliary

SD-TRK4

Trouble

ower

Alarm

Reset/Test

C08247

Fig. 39 -- Remote Test/Reset Station Connections

NOTICE

OPERATIONAL TEST ALERT

Failure to follow this ALERT 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.

OPERATIONAL TEST ALERT

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

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.

NOTICE

OPERATIONAL TEST ALERT

Failure to follow this ALERT 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.

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