MAPA Products, LLC Box 129 Naples, Texas 75568 Phone (903) 897-2371
Watts (877) 897-2371 Fax (903) 897-2781
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MAPA Products
MPH-24-FP:24/9 Pedestal Hydrant
October 2014
Installation Instructions – Parts List
Description of the Hydrant:
The MAPA MPH-24-FP:24/9 Pedestal Hydrant is a hydrant assembly based on the
venturi principle utilizing a globe valve within a fully insulated stainless steel shroud.
Meets ASSE 1057 Sanitary Yard Hydrant Standard.
This assembly is ideally suited for applications where there is concern for potential
damage to the hydrant assembly due to severe cold weather.
The Stainless Steel Shroud and Base allow the roof contractor to make a positive,
weather tight flashing to the Hydrant.
A quick disconnect provided at the hose fitting allows a hose to be readily removed
when not in use so as to insure proper evacuation of the reservoir during freezing
conditions.
The Under-deck Flange prevents the Hydrant from becoming dislodged from the
roof membrane during operation.
The Weather-Guard Domed Handle prevents moisture from entering the assembly when the valve is in the OFF position.
Supply connection is made at the ¾” fitting on the reservoir located at the base of the Hydrant.
Unpacking the Hydrant:
Parts Included:
Hydrant Assembly
Under-deck flange
Assembly Hardware
Installation Instructions
Assembly Hardware is located in a plastic bag that is attached to the underside of the under-deck flange.
Parts:
4 – ¼” X 2” set screws
4 – ¼” X 1 ½” hex head bolts
Verify that all assembly parts are present.
How the Hydrant Works:
The design of the hydrant assembly is based on a venturi principle. When the hydrant is OFF, the stopper seals against
the nozzle and stops flow. The water remaining in the riser drains back into the reservoir tank below the roofline. When
the hydrant is ON, the flow through the nozzle creates a vacuum in the reservoir evacuating the water out through the
hydrant. A brass valve float assembly located on the stainless shroud allows air to escape from the reservoir as the tank
fills and allows air to enter the tank as the vacuum force evacuates the water from the tank.
Caution:
During freezing conditions, if a disconnect/hose assembly is used on the hydrant, this hydrant requires the user
to operate the hydrant at full flow without this assembly for approximately thirty (30) seconds to ensure proper evacuation
of the reservoir tank. Remove the quick disconnect fitting with vacuum breaker from the hydrant’s outlet nozzle.
