IN006 Rev K 0417
4
3 Saber Way, Ward Hill, MA 01835 | radonaway.com
For GP500 piping, the following table provides the minimum recommended pipe diameter and pitch under several
system conditions.
*Typical GP500 operational flow rate is 25 - 90 CFM. (For more
precision, determine flow rate by using the chart in the addendum.)
The GP500 incorporates a unique condensation drain system which actively
pumps water back to the inlet piping for drainage to a slab hole. It is required
that the system piping provide a drop-off immediately at the inlet of the unit,
as shown in Figure 1, to prevent reintrainment of condensation. If this is not
possible the condensate drain tube may be extended to the point of drop off by
slipping 5/16” ID tubing (available from RadonAway) over the drain tube.
An alternative condensation drain may be provided using the 3/8” NPT fitting
on the bottom of the unit. The alternative drain system must account for Radon
leakage as the drain is under positive pressure. If the unit is installed and
electrical power is removed for extended periods of time the drain plug should be
removed to allow water to drain from the unit.
IMPORTANT: Do not overtighten drain plug! Do not use a wrench or tighten beyond finger tight. Apply sealant to
threads if required.
1.6 SYSTEM MONITOR & LABEL
A System Monitor, such as a manometer (P/N 50017) or audible alarm (P/N 28001-2) is required to notify the
occupants of a fan system malfunction. A System Label (P/N 15022) with instructions for contacting the installing
contractor for service and also identifying the necessity for regular radon tests to be conducted by the building
occupants, must be conspicuously placed where the occupants frequent and can see the label.
1.7 SLAB COVERAGE
The GP500 can provide coverage up to 1000+ sq. ft. per slab penetration. This will, of course, depend on the
sub-slab material in any particular installation and the diagnostic results. In general, the tighter the sub-slab
material, the smaller the area covered per penetration. Additional suction points can be added as required. It is
recommended that a small pit (5 to 10 gallons in size) be created below the slab at each suction hole.
1.8 ELECTRICAL WIRING
The GP500 plugs into a standard 115VAC outlet. The use of a Ground Fault Interrupter circuit (GFI) is
recommended for all installations and required for outdoor or wet installations. All wiring must be performed in
accordance with the National Fire Protection Association’s (NFPA)”National Electrical Code, Standard #70”-current
edition for all commercial and industrial work, and state and local building codes. All wiring must be performed by
a qualified and licensed electrician. Ensure that all exterior electrical boxes are outdoor rated and properly sealed to
prevent water penetration into the box. A means, such as a weep hole, is recommended to drain the box.
1.9 SPEED CONTROLS
The use of electronic speed controls on the GP500 is NOT recommended.
Pipe
Diameter
Minimum Rise per 1 Foot of Run*
@ 25 CFM
@ 50 CFM
@ 100 CFM
4”
1/8”
1/4”
3/8”
3”
1/4”
3/8”
1 1/2”
RUN
RISE
