Carrier COBRA 48/50HJ004-014- Manuals

8 Y L P P U S Q060 or 100 A 2 6 N O I T A C O L Q060 or 100 A 2 6 N O I T A C O L R2 . n i 3 . 0 1 . n i 3 . 0 1 R1 N O P I L P O O C S S D N E T X E S I H T R E V O A E R A B (W) (L) A AA (W) (L) Fig. 8A — COBRA™ Iso-Exhaust Return Air Hood Dimensions — 48/50HJ004-007 Units with 62AQ060, 100 62AQ S...

9 . n i 9 . 8 1 N O P I L P O O C S S D N E T X E S I H T R E V O A E R A Y L P P U S Q200 or 300 A 2 6 N O I T A C O L Q200 or 300 A 2 6 N O I T A C O L B R2 R1 . n i 9 . 8 1 A (W) (L) (W) (L) A Fig. 8B — COBRA™ Iso-Exhaust Return Air Hood Dimensions — 48/50HJ008-014 Units with 62AQ200, 300 62AQ SI...

10 Field-Installed 62AQ Application — A field- installed 62AQ energy recovery unit cannot use a COBRA™rooftop unit full perimeter curb. A standard curb with amounting kit and an adjustable support are used, as shown inTable 1 and Fig. 9 and 10. Ductwork attaches to the roof curb; do not attach ductw...

11 SYSTEM OPERATION The COBRA™ and field-installed 62AQ Energy$- Recycler™ units replace the rooftop unit economizer andcontain their own powered two-position outdoor air (OA)damper. See Fig. 1. Outdoor air passes through the damper,then through the upper coil and into the rooftop unit, where itmixe...

12 Cooling Mode — The cooling changeover thermostat located on the hood of COBRA™ and 62AQ energy recoveryunits determines when the energy recovery unit goes intoeconomizer mode. When the outdoor temperature is below thecooling set point, the unit will be in economizer mode. In the unoccupied mode, ...

13 ROOM AIR SUPPLY AIR MIXED AIR CONDENSER COMPRESSOR EV APORA TO R EVAPORA T O R ROOFTOP UNIT ROOF LINE ENERGY RECOVERY SECTION OUTSIDE AIR EXHAUST AIR THERMIDISTAT/HUMIDISTAT 95 F db/78 F wb 78 F db/69 F wb ROOM AIR SUPPLY AIR MIXED AIR CONDENSER COMPRESSOR EV APORA TO R EVAPORA T O R ROOFTOP UNIT...

14 ROOM AIR SUPPLY AIR MIXED AIR CONDENSER COMPRESSOR EV APORA TO R EVAPORA T OR ROOFTOP UNIT ROOF LINE ENERGY RECOVERY SECTION OUTSIDE AIR EXHAUST AIR THERMIDISTAT/HUMIDISTAT 85 F db/75 F wb 74 F db/65 F wb ROOM AIR SUPPLY AIR MIXED AIR CONDENSER COMPRESSOR EV APORA TO R EVAPORA T O R ROOFTOP UNIT ...

15 Table 2A — COBRA™ Energy Recovery Unit Sequence of Operation — Unoccupied LEGEND *Second stage for Y2 call applicable on rooftop units with 2 circuits only. †50% rooftop unit heat only applicable with 2-stage electric or gas heating units. Table 2B — COBRA Energy Recovery Unit Sequence of Operati...

16 HEATING — The heating outdoor air changeover thermostatdetermines the heating stage 1 to heating stage 2 switchoverpoint. During heating, the rooftop unit supply fan and energyrecovery unit supply fan are both always on. It is adjustablefrom 5 F to 50 F, will “make” as the temperature falls and w...

17 COBRA™ and 62AQ Unit Options HUMIDI-MIZER™ OPTION (Units after October 2004) —Units equipped with the Humidi-MiZer dehumidificationoption are capable of increased humidity control by utilizing acommon subcooling/reheat dehumidification coil. This uniqueand innovative design provides the capabilit...

19 ECONOMIZER USAGE — The energy recycler portion of aCOBRA unit or a field-installed 62AQ energy recovery unitcontains an integral economizer with barometric relief for“free” cooling when conditions are right. Therefore, an addi-tional economizer is not needed and cannot be mounted on arooftop unit...

20 87654321 33ZCSENCO2 CRTWOPOS001A01 or CRTWOPOS002A02 TWO POSITION DAMPER PLUG R1 24v Power 24v Power COM R1 R1 62AQ CONNECTIONBOARD Commercial Thermidistat NO(Alarm RelayContact) 6 4 3 1 J8 HM OC W2 W1 GRA GRA YEL YEL VIO WHT WHT T STAT 6 7 10 8 2 3 4 1 5 9 11 12 DEHUM OC W2 W1 G Y2 Y1 C R 876543...

22 W2 R Y1 Y2 W1 G C X HM OC T STAT UNIT W2 W1 W2 W1 HM HM R BASE UNIT CONNECTION BOARD CONTROL BOX CONTROL BOX THERMOSTATCONNECTION BOARD G C Y1 Y2 W1 W2 OC DEHUM LIGHT COMMERCIAL THERMIDISTAT CONNECTION BOARD Fig. 24 — Control Wiring with Thermidistat™ and Electro-Mechanical Controls

24 SPACE TEMPERATURE SENSOR (33ZCT56SPT) W2 R Y1 Y2 W1 G C X HM OC T STAT UNIT W2 W1 W2 W1 HM HM CONTROL BOX CONTROL BOX 1234 56 78 BLUBRN BLK TB2 TB1 PREMIERLINKCONTROLS HM R HUMIDISTAT 2 3 4 5 6 1 SW1 SEN SET Cool Warm BRN (GND) BLU (SPT) RED(+) WHT(GND) BLK(-) CCN COM SENSOR WIRING JUMPERTERMINAL...

25 C G R Y1 Y2 W1 W2 OC DEHUM * LIGHT COMMERICAL THERMIDISTAT CONTROL BOX CONTROL BOX HM HM W1 W2 OC HM W1 W2 T STAT UNIT W1 W2 Y2 Y1 R G C X THERMOSTAT CONNECTION BOARD TB1 PREMIERLINK CONTROLS 12345678 NOTE: Thermidistat connection terminal arrangement for schematic purposes only. Fig. 27 — Contro...

28 Gas Supply — The gas supply for 48HJ gas heat units can be run through the curb or through the bottom of the unit.See Fig. 31 and 32. When installing the gas supply throughthe curb, the gas piping will exit through the side of the roofcurb. The thru-the-curb accessory service connections (partnum...

29 WIRING For a COBRA™ unit, all interconnecting wiring between the rooftop unit section and the energy recovery section isfactory-supplied and factory-wired. Wiring from power supplyto unit is field-supplied. See the COBRA installation manual orthe 62AQ Energy$Recycler™ Installation Manual for appl...

30 CONTROLBOX MOTORIZED OUTDOOR AIR DAMPER FACTORY-MOUNTEDSTEP DOWNTRANSFORMER(460-V 004-007 ONLY) UNITWIRING DISCONNECT UNITCONTROLBOX ENERGY RECOVERY SECTION ROOFTOP UNIT SECTION 62 A QFi e ld-Ins ta lled 48/50HJ Rooftop Unit Wire sized per 62AQ Amp rating(62AQ MCA) Disconnect sized percombined MO...

33 Warm Cool Warm Cool Warm Cool Carrier COMFORT NETWORK MODEL 485SD9R RS-232 TO RS- 485 R S -4 85 RS-232 T-58DIGITALDISPLAYSENSOR T-58DIGITALDISPLAYSENSOR T-58DIGITALDISPLAYSENSOR 3 WIRE COM BUS 3 WIRE COM BUS 3 WIRE COM BUS CCN PC RS232, RS485 ADAPTER TEMPORARY OR PERMANENT ACCESS BUILDING MECHANI...

34 CONDENSATE PIPING Condensate piping from the COBRA™ energy recovery unit exits at the Energy$Recycler™ unit, near the bottom leftcorner of the exhaust air outlet. Condensate from the rooftopunit is piped to the Energy$Recycler condensate pan, so onlyone field-installed condensate line is required...

35 DESIGN EXAMPLES Design Example 1 — Carrier’s COBRA™ energy re- covery unit pre-conditions ventilation air by recovering energyfrom the building exhaust air during both summer and winteroperation. Additionally, the COBRA energy recovery unitwill benefit the application by potentially allowing high...

36 A COBRA™ energy recovery unit makes it possible to: • Select a smaller 4-ton 48/50HJ rooftop to operate with the same total airflow to satisfy the same conditions. • Pre-condition the same or larger quantities of outdoor air, depending on the application and climate. • Provide an additional stage...

37 SELECTION PROCEDURE WITH PACKAGED ROOFTOP BUILDER The selection procedure with Packaged Rooftop Builder (PRB) works like a normal selection procedure, except thatratings for the rooftop section, 62AQ Energy$Recycler™section, and the combined COBRA™ energy recovery unitratings are all shown. See F...

38 Fig. 46 — Electronic Selection Program — Performance Summary