MAPA Products MPH-24-FP:24/9 Datasheet

MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
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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.

MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
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Recommended Installation Procedures:
Support Framing: We strongly
recommend that prior to the installation of
this Roof mounted Pedestal Hydrant that a
field provided welded angle frame be
installed at the bottom surface of the roof
decking. This framing should be of
sufficient size to permit the provided under-
deck flange to slide freely yet firmly into the
frame and rest firmly against its top. The
framing should be of sufficient strength to
prevent any dislodging of the Hydrant
during normal operation. Refer to Figure 1.
Installation Sequencing:
We recommend that the Hydrant not be
installed until the roof decking and all roof
insulation is in place. A round hole should
be cut in the roof insulation and deck to
permit the hydrant to pass from the roof
surface through this opening to below the
roofline with the base resting squarely on
the insulation. We do not recommend
making final piping connections to the
Hydrant until all roof work associated with making the hydrant
base watertight to the roof is completed and then not until the
under-deck clamp has been installed.
Connections to the Water Source:
We recommend that a valve be installed on the
supply piping serving the hydrant. This valve should
be in a convenient and easily accessible location. In
order for the venturi to properly operate, we
recommend that the supply piping be minimum ¾”.
Optimal water pressure at the hydrant supply should
be 60 PSI (typical city water pressure), however it will
still operate properly at a minimum of 20 PSI.
Installation of the Hydrant: A hole approximately
seven inches (7”) in diameter should be cut in the
roof decking. The hole should be centered on an
angle frame welded to the roof structure below the
decking. Once roof insulation is in place, cut through
the insulation and place the Hydrant base squarely
onto the roof surface. Square the Hydrant, pointing
the outlet nozzle in the desired direction.
Refer to Figure 2 of the Instructions.
Caution should be taken to assure that the Hydrant is
vertically level above the roof. We do not
recommend installing the Hydrant within four feet of
the edge of the roof or within three feet of other roof
top equipment or on any sloping surfaces of the roof.
If recommended by the roofing manufacturer, holes
can be drilled along the outer edge of the flange to
permit anchoring of the hydrant to the roof membrane
prior to final flashing of the hydrant to the roofing
surface.

MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
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Installation of the Under-deck Flange: Once roofing work at the Hydrant has been completed, the under-deck flange
should be installed. Slide the under-deck flange from below, over the reservoir tank and onto the lower portion of the
hydrant’s shroud allowing equal distance from the shroud to the inside of the under-deck flange. Snug the flange securely
to the deck and angle framing. Using four (4) ¼” X 1 ½” bolts, secure the flange to the angle framing. Care should be
taken to insure that the under-deck flange is firm against the bottom of the roof deck while tightening these set screws.
See Figure 3
Next, using the four - (4) ¼” X 2” set screws, securely fasten the under-deck flange to the stainless flange
Refer to Figure 3 of the Instructions.
Installation of the Supply Piping: Make water supply connection only after the under-deck flange is securely attached
to the Hydrant. Remove the plastic plug from the end of the brass nozzle and connect appropriate piping connections.
We recommend that a minimum ¾” supply piping be used to make this connection. See Figure 3
Water Supply Test: It is recommended that the water supply be thoroughly tested prior to activating the Hydrant. To
avoid damage to the valve seat, the water supply system should also be purged of all foreign materials before the supply
valve to the Hydrant is opened.
Operation of the Hydrant: Hose connections to the Hydrant should only be made using the quick disconnect fitting
provided with the unit. This fitting incorporates a snap-on disconnect with a vacuum breaker. To prevent potential cross-
contamination of the water supply system, it is not recommended that any other type of hose connection be made to the
hydrant than as stated here.
To connect the disconnect fitting to the hydrant pull back on the spring-loaded female end of the disconnect at the
hydrant’s outlet and insert the male end that is attached to the vacuum breaker. Release the spring on the female end.
Attach the ¾” female fitting of a garden hose to the end of the vacuum breaker.
Winterizing for Severe Weather: It is recommended that to avoid possible damage to the Hydrant due to exposure to
extreme cold weather that during freezing conditions, if a hose is used on the hydrant remove the quick disconnect fitting
with vacuum breaker from the hydrant’s outlet nozzle., then operate the hydrant at full flow without the hose for
approximately thirty (30) seconds to ensure proper evacuation of the reservoir tank.
Maintenance:
A periodic test of the Hydrant should be performed. The dome handle should be opened and closed to assure that no
foreign material has entered the cavity within the dome. Difficulty in turning the handle is a possible indication of the
presence of foreign matter within. To remove this matter, first remove the plastic cap at the top of the handle. Second,
loosen and remove the ¼” lock nut and washers inside the cavity below this cap.
After removal of any foreign material, replace the handle and attachment hardware.
Repairing the Angle Valve Assembly and Shaft:
(The water supply to the Hydrant should be OFF prior to any repairs) Remove the dome handle, the lock nut and washers
to expose the interior cavity. Remove the valve bonnet using a basin or other appropriate wrench. The valve stem and
shaft will lift out of the top of the hydrant. Replace the defective parts and reassemble the valve. Replacement parts
should be ordered from MAPA Products.
After repairing the valve, replace the handle and attachment hardware.
Replacing the Dome Handle:
If the dome handle is broken, replacements are available. Please contact your local MAPA Representative to obtain
repair parts.

MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
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MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
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Limited Warranty:
MAPA will repair or replace any defective parts or workmanship of this product for a period of one year from date of
delivery. Damage caused by incorrect installation or improper usage is not warranted. Recovery rights shall be limited to
the total sum of the amounts paid for the product by the purchaser.
DISCLAIMER OF IMPLIED WARRANTY:
THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE DESCRIPTION HEREIN. SELLER DISCLAIMS ANY
IMPLIED WARRANTY OF MERCHANTABILITY OF THE GOODS OR OF THE FITNESS OF THE GOODS FOR ANY
PURPOSE, AND BUYER AGREES THAT THE GOODS ARE SOLD “AS IS.”
Limits of Liability:
MAPA’s liability shall be limited to costs of repair or replacement parts. Pedestals are not intended for usage other than
those expressly described in this document. MAPA shall not be liable for damage or injury caused by the improper use of
the product.