Carrier Comprehensive Guide to Roof Curbs for Efficient HVAC Installations
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HVACunit base

Screw (NO TE A)

*Gasketing outer flange

Flashing field

supplied

Roofing material

field supplied

Cant strip

field supplied

HVAC unit base

Gasketing

Screw

inner flange*

(NOTE A)

 

*Gasketing

 

outer flange

Wood nailer*

 

 

Flashing field

Roof curb*

supplied

Insulation(field

 

supplied)

Roofing material

 

 

field supplied

Ductwork

 

field supplied

Cant strip

 

 

field supplied

Roof

 

Gask eting inner flange*

Wood nailer*

Roof curb*

Insulation(field

supplied)

Ductwork field supplied

Roof

*Provided with roof curb*Provided with roof curb

Roof Curb for Small Cabinet

Roof Curb for Large Cabinet

Note A: When unit mounting screw is used,

Note A: When unit mounting screw is used,

retainer bracket must also be used.

retainer bracket must also be used.

50CR

 

 

E

 

G

 

 

Supply opening

 

F

 

 

(B x C)

 

 

 

 

 

G

BTyp.

D

 

 

 

 

 

F

 

CTyp.

 

 

 

 

 

 

 

 

 

R/A

S/A

 

 

A

 

Gasket around

 

 

 

 

 

 

E

D

duct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short

 

 

 

Insulated

 

 

 

Gasket around

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Insulated

 

 

Support

 

 

 

deck pan

 

 

 

 

outer edge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

deck pan

 

Long

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Return opening

 

 

 

 

 

 

 

 

 

 

Support

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(B X C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A05308

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNIT SIZE

ODS CATALOG

A

 

B

C

 

 

D

 

 

 

 

 

E

F

G

 

 

NUMBER

IN. (MM)

 

IN. (MM)

IN. (MM)

 

IN. (MM)

 

 

 

 

 

IN. (MM)

IN. (MM)

IN. (MM)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50CR024-036

CPRFCURB006A00

8 (203)

 

11 (279)

16--1/2 (419)

28--3/4 (730)

 

 

30--3/8 (771)

44--5/16 (1126)

45--15/16 (1167)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPRFCURB007A00

14 (356)

 

11 (279)

16--1/2 (419)

28--3/4 (730)

 

 

30--3/8 (771)

44--5/16 (1126)

45--15/16 (1167)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50CR042-060

CPRFCURB008A00

8 (203)

 

16--3/16 (411)

17--3/8 (441)

40--1/4 (1022)

 

41--15/16 (1065)

44--7/16 (1129)

46--1/16 (1169)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPRFCURB009A00

14 (356)

 

16--3/16 (411)

17--3/8 (441)

40--1/4 (1022)

 

41--15/16 (1065)

44--7/16 (1129)

46--1/16 (1169)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTES:

1.Roof curb must be set up for unit being installed.

2.Seal strip must be applied, as required, to unit being installed.

3.Dimension in ( ) are in millimeters.

4.Roof curb is made of 16-gauge steel.

5.Table lists only the dimensions, per part number, that have changed.

6.Attach ductwork to curb (flanges of duct rest on curb).

7.Insulated panels: 1-in. thick fiberglass 1 lb. density.

8.Dimensions are in inches.

9.When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic conditions. This bracket is available through Micrometl.

Fig. 2 - Roof Curb Dimensions

3

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Contents Table of Contents Installation InstructionsIntroduction Safety ConsiderationsElectrical Shock Hazard Equipment Damage HazardRoof Curb for Small Cabinet Roof Curb for Large Cabinet Unit Leveling Tolerances 50CR024-036 Unit Dimensions 50CR042-060 Unit Dimensions Property Damage Hazard Rig and Place UnitInspection Unit Falling HazardRigging Bracket Under Unit Rain Lip Select and Install Ductwork Electrical Operation HazardProvide for Condensate Disposal Physical Data Unit 50CR Typical InstallationHIGH-VOLTAGE Connections Routing Power Leads Into UnitConnecting Ground Lead to Ground Screw Routing Control Power WiresElectrical Data-50CR Electrical Data Legend Wiring Schematics-50CR Single Phase Wiring Schematics-50CR Three Phase Line Power Connections Accessory InstallationPRE-START-UP FIRE, EXPLOSION, Electrical Shock Hazard START-UPUnit Start-Up Verify Motor Winding Section Status Code 45, Control Board Test FaultStatus Code 37, Heater Output Sensed on When not Energized Status Code 44, Motor Communication FaultStatus Code 25, Invalid Motor / Model Selection Status Code 36, Heater Output not Sensed When EnergizedStatus Code 41, Blower Motor Fault Status Code 16, System Communication FaultStart-Up Adjustments Sequence of OperationCheck for Refrigerant Leaks Typical Heat Pump Operation, Cooling Mode Defrost Control Electric Heat Pressure Drop Table Small Cabinet Maintenance Personal Injury and Unit Damage HazardUnit Operation Hazard Outdoor Fan Air FilterIndoor Blower and Motor Outdoor Coil, Indoor Coil, and Condensate Drain PanPressure Switches Indoor AirflowMetering Devices-TXV & Accurater Piston High-Pressure Switch EXPLOSION, FIRE, Electrical Shock HazardPersonal INJURY, Unit Operation Hazard System Information LOSS-OF-CHARGE SwitchTroubleshooting START-UP ChecklistObserve all warnings, cautions, and bold text Troubleshooting Chart Head pressure too low Troubleshooting Chart Cont’dSTART-UP Checklist
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