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6
2.5 Piping Considerations
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 inches (279 mm).
2.5.1 Drain Line
A 3/4" (19.1 mm) 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 connec-
tion and pitched a minimum of 1/8" per ft. (11 mm per meter).
NOTE
This line may contain boiling water. Select appropriate drain system materials.
The drain line must include one and only one trap. Units without a condensate pump have a
factory-supplied trap in the unit, so a field trap should not be added. Units with a condensate
pump will require a field-supplied trap downstream from the pump. The drain line must
comply with all applicable codes.
Table 2 Piping connection size
Air Cooled Unit Connection Sizes—in.
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
Split System Fan Coil Unit Connection Sizes—in.
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
All Units: Connection Sizes—in.
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
Water/Glycol Cooled Unit Connection Sizes—inches
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
GLYCOOL Unit Connection Sizes —in.
Model No. BE/BK
(50 Hz)
Supply Line
S
Return Line
R
061G (058G) 1-1/8 1-1/8
Chilled Water Unit Connection Sizes—in.
Model No. BF/BU
(50 Hz)
Supply Line
CWS
Return Line
CWR
068C (072C) 1-1/8 1-1/8
102C (101C) 1-1/8 1-1/8