Greenheck Fan PVE-55, PVE-35, PVE-20, PVE-45 manual Dimensional Data, Drain Trap

Dimensional Data

Exhaust

Air Hood

		Bypass
Hood	Filters	Damper
OutdoorAir		Face	Plate Heat
		Damper	Exchanger

Control Center

Top view

D	A
Outdoor	Filters
Air Hood	Plate Heat
	Exchanger
	Filters

Side view

E

C

B

Drain Trap

The PVe plate heat exchanger is provided with two stainless steel drain pans and each is equipped with a one inch MPT drain fitting. A drain trap must be installed on each drain fitting to allow excess water to flow out of the drain pans. More importantly, though, due to the negative internal static pressure inside the PVe cabinet, installing drain traps prevents outdoor air from being pulled into the cabinet and consequently causing overfilling of the drain pans or misting of PVe components.

To ensure the drain trap works properly, the trap height must account for the difference in static pressure between ambient conditions outside the unit and the negative static pressure inside the PVe cabinet. An assumption of 3.0 in. wg differential is normally sufficient for all PVe units and this would require a trap design as shown. If the internal static is believed to be higher, consult the factory.

4 in.

2 in.

Unit	A	B	C	D	E
Size
PVe-20	104.1	59.7	41.5	20.3	20.7
	(2650)	(1520)	(1060)	(520)	(530)
PVe-35	104.1	59.7	49.2	25.2	17.7
	(2650)	(1520)	(1250)	(640)	(450)
PVe-45	110.6	59.7	61.1	25.2	19.0
	(2810)	(1520)	(1560)	(640)	(490)
PVe-55	116.5	59.7	76.1	25.2	23.8
	(2959)	(1520)	(1940)	(640)	(610)

All dimensions are shown in inches (millimeters).

Door handles, hinges and other protrusions are not included in the dimensions above. Dimensions are rounded up to the nearest .1 inch (2.54 millimeters).

Refer to local codes to determine drainage requirements. If draining onto a roof, place a drip pad beneath the drain outlet to protect the roof. If draining onto a roof is not acceptable, a drain line must be attached to the drain trap. The drain line must be pitched away from the unit at least 1/8-inch per foot. On longer runs, an air break should be incorporated to ensure proper drainage. Local codes may require drainage into a waste water system.

Drainage problems result not only from improper drain trap design, but also from lack of maintenance in the PVe cabinet. Algae can form in the drain pans and traps and cause reduced water flow, which can in turn result in a backup in the drain system. Regular maintenance and inspection will prevent this from occurring. If the drains have a cleanout opening, be sure and close the opening after cleaning and refill the trap with water.

8Model PVe Heat Recovery Unit