Carrier 62MB, 62ME, 62MC, 62MD specifications Service

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EXH blower motor is turned on.

The two-position damper is open (if used).

The stop/jog option will periodically rotate the ERV wheel to clean it during wheel bypass operation. This feature is factory set to activate every 10 minutes, for 20 seconds of operation. Both settings can be adjusted from 0 to 10 minutes.

UNOCCUPIED MODE — While in unoccupied mode, when below the low temperature lockout set point, the ERV wheel is off, and only the two-position damper option is opened to allow free cooling when desired. The dampers are controlled by either the ERV Timer option (scheduling program) or the CO2 sensor input. Additionally, the frost protection and preheat options are also off. The low temperature lockout (LTLO) function locks out the 62M ERV if the outdoor-air temperature entering the wheel is below the set point. The LTLO is factory set at –10 F, and can be field adjusted from –30 F to 100 F.

When above the low temperature lockout set point and cooling is desired the economizer or wheel bypass option is also used. Depending on the option used with the 62M ERV, several sequences of operation could occur.

Unoccupied Mode, with the Economizer Accessory — When using the economizer option, this allows for up to 100% out- side air to be brought in for free cooling. During free cooling, no mechanical cooling is operating and the following occurs:

ERV wheel is turned off.

Outdoor air blower motor is off.

EXH blower motor is off.

Two-position OA damper option is closed (if used).

Two-position EXH damper is open (if used).

The stop/jog option will periodically rotate the ERV wheel to clean it during wheel bypass operation.

When using the economizer option and mechanical cooling is operating, the economizer should be closed or at the mini- mum position.

Unoccupied Mode, with the Wheel Bypass Option — When using the wheel bypass option (with the stop/jog option), this allows free cooling through the wheel limited by the ERV cfm limits. With this option the unit can be in free cooling or not depending on the temperature of the OA compared to the set point. When in free cooling:

ERV wheel is turned off.

Outdoor air blower is on.

EXH blower motor is on.

Two-position damper is open (if used).

When not in free cooling:

To install the segments see the Installing Wheel Segments (62M075-950) section.

Removing and Installing Non-Segmented Wheel for Cleaning (62M040 Units) — Non-segmented ener- gy transfer wheels are secured to the shaft and bearing support beam by a Phillips head screw and hub cover. See Fig. 84.

To remove the energy transfer wheel, follow Steps 1-4 below. (See Fig. 84.) Reverse procedure for wheel installation.

1.Remove front seal assembly (pulley side of cassette) if present.

2.Remove belt from pulley and position temporarily around wheel rim.

3.Remove the hub cover from the wheel. Note the wheel to shaft alignment pin under the hub cover. Ensure this pin engages the notch at the end of the shaft when reinstalling the wheel.

4.Pull the wheel straight off the shaft. Handle wheel with care to prevent distorting of the wheel.

Fig. 83 — Unlocking the

Segment Retaining Brackets

ERV wheel is turned off.

Outdoor air blower motor is turned off.

EXH blower motor is turned off.

Two-position damper is closed (if used).

SERVICE

Disconnect electrical power before servicing energy recov- ery cassette.

Removing Wheel Segments for Cleaning (62M170-950 Units)

1.

Unlock and open the segment retaining brackets on both

 

sides of the selected segment opening. Refer to Fig. 83.

2.

Gently lift segment outward.

3.

Close segment retaining latches and rotate wheel 180 de-

Alignment

Pin

Hub Cover

Wheel & Hub

Cassette Housing/Frame

Shaft

Bearings (2)

grees to remove next segment. Follow this pattern to

remove all segments. This pattern will help keep wheel

balanced.

Fig. 84 — 62M040 Energy Transfer Wheel Assembly

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Contents Installation, Start-Up Service Instructions Assembling the Roof Curb Roof Curb 62M040 for Stand-Alone Applications All dimensions are in inches Roof curb shipped unassembled170-285† DimensionsDimensions 075,120 Duct SizesDimensions 075,120 62M-A-CRB-14MC 30.5 62M-B-CRB-14MC 49.63 45.5Field provided Front Rear Left Right Required Service ClearancesFront 27.5 Rear Left Right 62MD,ME040 Outdoor Unit Dimensions39 in. service clearance required for ERV wheel removal 62MB,MC075,120 Indoor Unit Dimensions62MD,ME075,120 Outdoor Unit Dimensions View A-A 55 in. service clearance required for ERV wheel removal62MD,ME170-285 Outdoor Unit Dimensions 62 in. service clearance required for ERV wheel removal Required Service Clearances View A-A62MD,ME330-640 Outdoor Unit Dimensions 72 in. service clearance required for ERV wheel removal FrontRear Left 62MD,ME750,950 Outdoor Unit Dimensions 004-007 RooftopUnit Curb Top ViewUnit Curb Support Roof Curb Location DetailReturn 48/50PG 03-07ERV 67 3/8 TOP View48/50HJ,TF,TJ,TM 008,009 62M-ATR-HJ78-H 62M-A-CRB-14MC Cannot be used. Use the 62M economizer insteadSupply Return Rooftop Unit Curb48/50PG 62M-ATR-PG712-H Unit Curb Rooftop Unit CurbSide View A-A 62M-ATR-PG26-H62M-BTR-HJ36-D 62M-B-CRB-14MC 008,009 62M-BTR-HJ78-D 62M-B-CRB-14MC78 1 012,014 62M-BTR-HJ1012-D 62M-B-CRB-14MC 62M-BTR-HJ36-H 62M-B-CRB-14MC 62M-BTR-HJ78-H 62M-B-CRB-14MC62M-BTR-HJ1012-H 62M-B-CRB-14MC 015,017 62M-BTR-HJ1525-D 62M-B-CRB-14S Length is 891/16″ for 48/50TM028 units62M-BTR-HJ1525-D 62M-B-CRB-14S 48/50HJ62M-BTR-PG712-D 62M-A-CRB-14MC 62M-BTR-PG26-D 62M-A-CRB-14MC62M-BTR-PG26-H 62M-B-CRB-14MC 80 5 44 11 Rooftop Unit Curb 38 3/4 49 5/8 ERV CurbCurb Detail Unit 38 3/4 Curb020-028 62M-BTR-HG1525-H 62M-B-CRB-14MC 114.4 78.6 20-28 62M-BTR-HG1525-H 62M-B-CRB-14MC 114.4 78.648/50HJ 020-028 62M-BTR-HG1525-D 62M-B-CRB-14MC 114.4 48/50PG 20-28 62M-BTR-HG1525-D 62M-B-CRB-14MC 114.4012,014 62M-CTR-HJ1012-D 62M-C-CRB-14M Supply62M-CTR-HJ1012-HEC 62M-C-CRB-14M 62M-CTR-HJ1012-H 62M-C-CRB-14M74 1/4 Rooftop Unit AccessoryTransition Rooftop Unit Accessory 62M ERV Unit 62M330-640 Optional Economizer Hood Exhaust hood48/50PG 08-14 62M-CTR-PG712-D 62M-C-CRB-14M 923/4 5315/16 60 11/32 ERV Curb 62M ERV Unit ERV Curb ERV Energy Recovery Ventilator48/50HJ 020-028 62M-CTR-HG1525-H 62M-B-CRB-14M 114.4 48/50PG 20-28 62M-CTR-HG1525-H 62M-C-CRB-14M 114.448/50HJ 020-028 62M-CTR-HG1525-D 62M-B-CRB-14M 114.4 Hood rather than the bottom. The newHood will use the filters from the original 48/50PG 20-28 62M-CTR-HG1525-D 62M-C-CRB-14M 114.448/50A 020-060 62M-CTR-AJ2060-D 62M-C-CRB-14M 58 3/4 ERV Curb Rooftop Unit Curb 77 3/4 Outside airHood 62M Unit ERV Wheel ERV Curb Rooftop Unit Economizer See Note Standard Rooftop Unit CurbStandard factory economizer cannot be Used when coupled with 62M750,950 units62M ERV Unit Rooftop ERV Wheel Hood48/50HJ 020-028 62M-DTR-HG1525-H 62M-D-CRB-14M 114.4 48/50PG 20-28 62M-DTR-HG1525-H 62M-D-CRB-14M 114.448/50PG 20-28 62M-DTR-HG1525-D 62M-D-CRB-14M 114.4 62M750,950 ERV ERV CurbHood O/A Outdoor Air Relief HoodSee curb Detail 77 3/4 Rooftop Unit 62M ERV Unit86.25 Rooftop Unit 57 9/16 Curb 95.7Side View Rigging Details Physical Data Make Electrical Connections Electrical Data Without VAV Option Size ERV Electrical Data With VAV Option NEC FLA MCA VFD Exhaust and Supply Power Supply PRE Disconnect Economizer End Switch Wiring Typical Wiring Schematic, High Voltage MCA Minimum Circuit Amps Energy Recovery VentilatorPrimary SecondaryHigh Voltage Low Voltage Disconnect Fiop START-UP 62M040-120 ERV Wheel Pressure Drop 62M550,640 62M750,950 62M550-950 ERV Wheel Pressure Drop*62M040 Supply Air Fan Performance Curves 62M075 Supply Air Fan Performance Curves 62M120 Supply Air Fan Performance Curves 2200 28002600 240062M225 Supply Air Fan Performance Curves 62M285 Supply Air Fan Performance Curves 4500 4000 3500 3000 2500 5500 50004500 4000000 500 500 00062M640 Supply Air Fan Performance Curves 62M750 Supply Air Fan Performance Curves 11500 11000 10500 10000 95009000 8500 8000 7500 7000 6500 Blower Motor Pulley Adjustment Service Installing Wheel Segments 62M170-950 Units Series wheel WheelDrive MotorMaintenance Diameter Seal Adjustment Copyright 2006 Carrier Corporation Page START-UP Checklist