Emerson 3000 Manuel D’Utilisation

All piping below the elevated floor must be located so that it offers the least resistance to air flow. 

Careful planning of the piping layout under the raised floor is required to prevent the air flow from 

being blocked. When installing piping on the subfloor, it is recommended that the pipes be mounted in 

a horizontal plane rather than stacked one above the other. Whenever possible, the pipes should be 

run parallel to the air flow.
Condensate pumps for downflow units are shipped separately to be field-installed under the raised 

floor. Pump height is 11 in. (279mm).

A 3/4" (19.1mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate 

drain. This drain line also drains the humidifier, if applicable. The drain line must be located so it will 

not be exposed to freezing temperatures. The drain should be at least the full size of the drain 

connection and pitched a minimum of 1/8" per ft. (11mm per meter).

Risk of water backing up in the evaporator coil drain line. Can cause the drain pan to 

overflow, resulting in building and equipment damage.
Do not install an external trap in the drain line of units without a condensate pump. This line 

already has a factory-installed trap inside the cabinet.

Risk of drain line damage. Can cause water leaks resulting in furniture, equipment and 

building damage.
This line may contain boiling water. Select appropriate drain system materials.
Units with a condensate pump will require a field-supplied trap downstream from the pump. 

The drain line must comply with all applicable national, state and local plumbing codes.

Model No. BF/BU

(50 Hz)

Liquid Line O.D. Copper

L

Hot Gas Line OD Copper

HG 

042A (040A)

3/8

5/8 

067A (065A)

1/2

7/8 

Model No. BF/BU (50 Hz)

Liquid Line

L

Suction Line

SC

036E (035E)

5/8 - 18 Female (#6 QC) 

1-1/8 - 12 Female (#11 QC)

060E (059E)

1/2 OD Cu

1-1/8 OD Cu

Humidifier Line

OD Copper

H

Condensate

Drain Line

C

Condensate Pump Line 

OD Copper

P

Hot Water Reheat

OD Copper

1/4

3/4 FPT

1/2 

Supply 

HWS

Return 

HWR

5/8

5/8

Model No. BF/BU

(50 Hz)

Supply Line

S

Return Line

R

046WG (045WG)

7/8

7/8

071WG (070WG)

1-1/8

1-1/8

Model No. BE/BK

(50 Hz)

Supply Line

S

Return Line

R

061G (058G) 

1-1/8 

1-1/8