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Carrier WeatherExpert 48LC B14 Series, Installation Instructions Manual

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Carrier WeatherExpert 48LC B14 Series Installation Instructions Manual Download Page 39

39

Variable Air Volume (VAV) with Variable Fre-
quency Drive

The Variable Air Volume (VAV) system utilizes a Variable Fre-

quency Drive (VFD) to modulate supply fan speed using a PID

and an analog input from a duct static pressure sensor. The supply

fan will adjust to meet the configured static set point regardless of

cooling stage. In heating mode, the latest VAV Open air terminals

offer a minimum airflow setting. This shall be configured to main-

tain the required airflow (CFM) whenever the RTU is in a heating

mode per the unit’s specification. The Open VAV terminals will

recognize the Heating or Warm-up modes as a heat mode and uti-

lize the higher airflow minimum setpoint as configured. The sys-

tem will further monitor the SAT of the RTU to determine if the

SAT is approaching the configured maximum limit. As the limit is

approached, the Linkage mode is changed to Linkage Pressuriza-

tion to ensure all terminals open to their maximum supply airflow.

See Fig. 54 and 55.

Fig. 54 — Variable Frequency Drive (VFD)

Fig. 55 — VFD Location

MULTI-SPEED VFD DISPLAY KIT (FIELD-INSTALLED
OPTION)
NOTE: The Remote VFD Keypad is part of the Multi-Speed VFD

display kit (PN: CRDISKIT002A00) which is a field-installed op-

tion. It is not included with the 48LC*B14-26 base units.

230V/460V

575V ONLY

Summary of Contents for WeatherExpert 48LC B14 Series

Page 1: ...ing 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 basic maintenance functions of cleaning coils and filters and replacing filters All other operations should be performed by trained service personnel When working ...

Page 2: ...s le bâtiment Vérifier que toutes les ouvertures pratiquées dans le mur ex térieur autour du ou des tuyaux d évent et de la prise d air sont scellées de manière à empêcher l infiltration de produits de combustion dans le bâtiment Veiller à ce que la ou les sorties de l évent de l appareil de chauffage et la prise d air ne soient en aucune façon ob struées quelle que soit la saison GAS VALVE INLET ...

Page 3: ...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 Voltage 1 575 3 60 5 208 230 3 60 6 460 3 60 Design Revision Factory Design Revision Intake Exhaust Options required on each unit B Temperature Low Leak Economizer with Barometric Relief C Temper...

Page 4: ...4 Fig 2 48LC B14 Vertical Airflow ...

Page 5: ...5 Fig 3 48LC B14 Horizontal Airflow ...

Page 6: ...6 Fig 4 48LC B14 Back View and Condensate Drain Location ...

Page 7: ...7 Fig 5 48LC B14 Corner Weights and Clearances ...

Page 8: ...8 Fig 6 48LC B14 Bottom View ...

Page 9: ...9 Fig 7 48LC B17 20 Vertical Airflow ...

Page 10: ...10 Fig 8 48LC B17 20 Horizontal Airflow ...

Page 11: ...11 Fig 9 48LC B17 20 Back View and Condensate Drain Location ...

Page 12: ...12 Fig 10 48LC B17 20 Corner Weights and Clearances ...

Page 13: ...13 Fig 11 48LC B17 20 Bottom View ...

Page 14: ...14 Fig 12 48LC B24 26 Vertical Airflow ...

Page 15: ...15 Fig 13 48LC B24 26 Horizontal Airflow ...

Page 16: ...16 Fig 14 48LC B24 26 Back View and Condensate Drain Location ...

Page 17: ...17 Fig 15 48LC B24 26 Corner Weights and Clearances ...

Page 18: ...18 Fig 16 48LC B24 26 Bottom View ...

Page 19: ... Refer to Step 11 Install External Condensate Trap and Line for re quired trap dimensions ROOF MOUNT Check building codes for weight distribution requirements Unit operating weight is shown in Table 2 Step 2 Plan for Sequence of Unit Installation The support method used for this unit will dictate different se quences for the steps of unit installation For example on curb mounted units some accesso...

Page 20: ...ontal airflow units see Fig 3 8 or 13 Attach the service connections to the basepan SLAB MOUNT HORIZONTAL UNITS ONLY Provide a level concrete slab that extends a minimum of 6 in 150 mm beyond unit cabinet Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstruct ing airflow NOTE Horizontal units may be installed on a roof curb if required ALTERNATE UNIT...

Page 21: ...21 Fig 20 48LC B14 Roof Curb Details ...

Page 22: ...22 Fig 21 48LC B17 20 Roof Curb Details ...

Page 23: ...23 Fig 22 48LC B24 26 Roof Curb Details ...

Page 24: ...s and sizes of the horizontal duct connections Note that there are two different return air duct connection locations one for non VAV units without an economizer on back side of unit and a different one for LC B VAV units with the integrated economizer on left end under the economizer hood The sup ply air duct connection is on the back side See Fig 23 for top view depicting typical horizontal duct...

Page 25: ...ons 1 Remove hood top panel from shipping position on unit end 2 Install filters supports item 1 to the upper end panel using the screws provided 3 Install each deflector item 8 on to each filter support item 1 using the screws provided 4 Apply seal strip to mating flanges on side plates of hood items 4 and 5 5 Secure side panels items 4 and 5 to upper panel using the screws provided 6 Apply seal ...

Page 26: ... the hood to the back of the burner access panel Using the two screws re attach the hood to the front of the burner access panel as shown in Fig 31 Fig 31 Flue Hood and Combustion Air Hood Details Step 12 Install Gas Piping Installation of the gas piping must be in accordance with local building codes and with applicable national codes In U S A refer to NFPA 54 ANSI Z223 1 National Fuel Gas Code N...

Page 27: ...han 13 in wg 3240 Pa at the unit connection see Table 5 Manifold pressure is factory adjusted for NG fuel use Adjust as required to obtain best flame characteristics See Table 6 Manifold pressure for LP fuel must be adjusted to specified range see Table 7 Follow instructions in the accessory kit to make ini tial readjustment Table 3 Typical 3 4 in NPT Field Supplied Piping Parts ITEM QTY DESCRIPTI...

Page 28: ...damage Support all piping with appropriate straps hangers etc Use a minimum of one hanger every 6 ft 1 8 m For pipe sizes larger than 1 2 in follow recommen dations of national codes 3 Apply joint compound pipe dope sparingly and only to male threads of joint when making pipe connections Use only pipe dope that is resistant to action of liquefied petro leum gases as specified by local and or natio...

Page 29: ...nnect On a unit without a unit mounted disconnect or HACR connect the source leads to the terminal block with unit field power leads See Fig 38 Fig 38 Location of TB1 Field power wires are connected to the unit at line side pressure lugs on the terminal block see wiring diagram label for control box component arrangement or at factory installed option non fused disconnect switch or HACR breaker Us...

Page 30: ...30 Fig 40 48LC B14 26 VAV RTU Open Control Wiring Diagram ...

Page 31: ...31 Fig 41 48LC B14 26 Power Wiring Diagram ...

Page 32: ... silver metal collar is at OFF 3 Insert the shaft with the cross pin on the top of the shaft in the horizontal position 4 Measure the tip of the shaft to the outside surface of the cor ner post to be 0 88 in 5 Tighten the locking screw to secure the shaft to the NFD 6 Turn the handle to OFF position with red arrow pointing at OFF 7 Install the handle on to the corner post vertically with the red a...

Page 33: ...atherproof Cover Aweatherproof while in use cover for the factory installed conve nience outlets is now required by UL standards This cover cannot be factory mounted due to its depth it must be installed at unit in stallation 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 ba...

Page 34: ...and power line phasing if the GFCI receptacle does not trip as required Press the RESET button to clear the tripped condition Using unit mounted convenience outlets Units with unit mounted convenience outlet circuits will often re quire that two disconnects be opened to de energize all power to the unit Treat all units as electrically energized until the conve nience outlet power is also checked a...

Page 35: ... KIT Correctly rated low voltage wire can be routed through the rubber grommet located on the corner post adjacent to the control box ac cess panel Route wire through the grommet and then route the wire behind the corner post utilizing the factory provided wire ties secured to the control box This will insure separation of the field low voltage wire and the high voltage circuit Route the low volt ...

Page 36: ...en LED Note 1 2 Check HPS LPS COFS RED RED 3 Call for Y3 with no call for Y1 Check Y1 wiring RED 4 Call for Y3 with no call for Y1 Y2 Check Y1 wiring RED RED 5 Call for Y2 with no call for Y1 Check Y1 wiring RED RED 6 Call for W2 with no call for W1 Check W1 wiring RED RED 7 Call for heat W1 W2 and cooling Y1 Y2 Y3 Check VAV RTU Open wiring RED RED RED RED 8 Call for heat W1 W2 with no IFM Check G...

Page 37: ...l be cal culated based on the output of the DCV calculation Two user con figurable values are provided the DCV Max Ctrl Setpoint is the differential CO2 setpoint that is used as the control point and a DCV Max Vent Damper Pos provides the ability to limit the maximum amount of outdoor air being introduced into the unit through the economizer by the DCV control The economizer will be positioned at ...

Page 38: ... time before it turns IFO OFF At this time the ISC board sees W1 OFF and IFO ON The ISC will keep the indoor fan ON high speed Once the IGC board delay times out the ISC board will see W1 OFF and IFO OFF which then turns the indoor fan OFF If the call for W1 lasted less than 1 minute the heating cycle will not terminate until 1 minute after W1 became active The indoor fan motor will continue to op...

Page 39: ...ation The Open VAV terminals will recognize the Heating or Warm up modes as a heat mode and uti lize the higher airflow minimum setpoint as configured The sys tem will further monitor the SAT of the RTU to determine if the SAT is approaching the configured maximum limit As the limit is approached the Linkage mode is changed to Linkage Pressuriza tion to ensure all terminals open to their maximum s...

Page 40: ...eter value 3 Setup number shows the active setup and the edit setup If the same set up acts as both the active and edit set up only that setup number is shown factory setting When the active and edit setup differ both numbers are shown in the display SETUP 12 The flashing number indicates the edit setup 4 The symbol in the number 4 position in the figure above indicates motor direction The arrow p...

Page 41: ...e requires use of the VFD Keypad which is included as part of the field installed Multi Speed VFD display kit PN CRDISKIT002A00 If the VFD keypad is not already installed install it See Connecting the Keypad to the VFD for details To program the VFD for variable indoor fan motor speeds 1 At Power Up At the first power up the LCD displays the Select Language screen The default setting is English se...

Page 42: ...Menu The display shows the following b Press OK twice the display changes to c Press Down Arrow three times to reach the fol lowing display d Press OK to highlight the number in the bracket and then use the and Up and Down Arrow keys to select the desired voltage and Hertz for the unit e Press OK to accept the selection and continue 5 Entering Motor Data a Press the Menu key to move the triangle i...

Page 43: ...provided in Tables 10 14 Press OK again to set the selected value g Press Down Arrow twice the following display appears h Press OK to highlight the number in the bracket and then use the and Up and Down Arrow keys to select the number provided in Tables 10 14 Press OK again to set the selected value i Press the Back key once the following display appears j Press Down Arrow once the following disp...

Page 44: ...ollowing display appears f Press Down Arrow again the following display appears NOTE Press OK to highlight the Hz value and then use the and Up and Down Arrow keys to enter the required values g Press Down Arrow once the following display appears NOTE Press OK to highlight the value and then use the and Up and Down Arrow keys to enter the required value See Tables 10 14 for proper selection of the...

Page 45: ...ighlight the number in the bracket g Use the and Up and Down Arrow keys to change the number to 3 for 3 automatic resets and then press OK The display changes to h Press Down Arrow once the following display appears i Press OK to highlight the number of seconds and use the and Up and Down Arrow keys to select 600 seconds Press OK again to set the selected value j Press the Back key once the follow...

Page 46: ...T REFERENCE Motor Option Voltage 1 71 1 73 1 82 1 90 3 10 0 3 10 1 3 10 2 3 10 3 3 10 4 3 10 5 3 10 6 3 10 7 STD 208 230 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 460 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 575 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 MID 208 230 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 460 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 575 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 HIGH 208 23...

Page 47: ...0 21 2 1760 460 HD60FK657 HK30WA380 131L9867 1 122 14 460 60 9 7 1760 575 HD60FL576 HK30WA384 131N0229 1 132 14 575 60 7 2 1745 HIGH 208 230 HD62FK654 HK30WA374 131L9799 1 102 15 230 60 28 0 1760 460 HD62FK654 HK30WA381 131L9868 1 122 15 460 60 13 7 1760 575 HD62FL576 HK30WA384 131N0229 1 132 15 575 60 8 9 1750 ULTRA 208 230 HD64FK654 HK30WA375 131L9800 1 102 16 230 60 37 3 1755 460 HD64FK654 HK30...

Page 48: ...0 60 3 600 0 575 2 10 0 60 3 600 0 HIGH 208 230 2 10 0 60 3 600 0 460 2 10 0 60 3 600 0 575 2 10 0 60 3 600 0 ULTRA 208 230 2 10 0 60 3 600 0 460 2 10 0 60 3 600 0 575 2 10 0 60 3 600 0 Table 12 VFD Unit Parameters 48LC B Size 20 REGIONAL SETTINGS GRID TYPE MOTOR POWER MOTOR VOLTAGE MOTOR FREQUENCY Hz MOTOR CURRENT MUST HOLD AMPS MOTOR NOMINAL SPEED RPM Motor Option Voltage Motor P N VFD Carrier P...

Page 49: ...INAL 18 DIGITAL INPUT TERMINAL 19 DIGITAL INPUT TERMINAL 27 DIGITAL INPUT TERMINAL 29 DIGITAL INPUT Motor Option Voltage 3 41 3 42 4 18 5 10 5 11 5 12 5 13 STD 208 230 10 00 10 00 100 8 16 17 18 460 10 00 10 00 100 8 16 17 18 575 10 00 10 00 100 8 16 17 18 MID 208 230 10 00 10 00 100 8 16 17 18 460 10 00 10 00 100 8 16 17 18 575 10 00 10 00 100 8 16 17 18 HIGH 208 230 10 00 10 00 100 8 16 17 18 46...

Page 50: ... 33 64 48 100 100 0 0 0 575 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 MID 208 230 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 460 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 575 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 HIGH 208 230 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 460 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 575 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 RAMP UP TIME sec RAMP DOWN TIME sec CURRENT LIMIT T...

Page 51: ... 00 72 00 100 100 0 0 0 575 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 MID 208 230 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 460 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 575 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 HIGH 208 230 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 460 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 575 2 0 1 1 0 4 0 60 00 72 00 100 100 0 0 0 RAMP UP TIME sec RAMP DOWN TIME sec CURRENT LIMIT T...

Page 52: ... hand partition 3 Orient the tube s sampling holes into the return air flow direc tion For vertical application position the sampling holes on the bottom of the tube facing into the bottom return duct opening For horizontal application position the sampling holes on the side of the tube facing the unit s end panel 4 Insert the sampling tube into the return air sensor module until the tube snaps in...

Page 53: ......

Page 54: ... discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53480267 01 Printed in U S A Form 48LCB 14 26 02SI Pg 54 9 19 Replaces 48LCB 14 26 01SI 2019 Carrier Corporation ...

Page 55: ...d range Y N _____ Check gas piping for leaks Y N _____ Check that indoor air filters are clean and in place Y N _____ Check that outdoor air inlet screens are in place Y N _____ Verify that unit is level Y N _____ Check fan wheels and propeller for location in housing orifice and verify setscrew is tight Y N _____ Verify that fan sheaves are aligned and belts are properly tensioned Y N _____ Verif...

Page 56: ...LINE PRESSURES Gas Inlet Pressure _____________IN WG Gas Manifold Pressure STAGE 1 _____________IN WG STAGE 2 _____________IN WG Refrigerant Suction CIRCUIT A _____________ PSIG CIRCUIT B _____________ PSIG Refrigerant Discharge CIRCUIT A _____________ PSIG CIRCUIT B _____________ PSIG Verify Refrigerant Charge using Charging Charts Y N _____ GENERAL Economizer minimum vent and changeover settings...

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