MAPA Products MPH-24-D:24/9 User manual

MAPA Products
MPH-24-D:24/9 Pedestal Hydrant
July 2011
Installation Instructions – Parts List
Description of the Hydrant:
The MAPA Pedestal Hydrant with Auto-Drain is a hydrant assembly utilizing a full port ball
valve with an auto-drain port that is located below freeze line at the base of the Hydrant.
An auto-drain type hose vacuum breaker is permanently attached to the discharge outlet
located near the top of the pedestal. The assembly is housed within a stainless steel shroud.
The assembly is ideally suited for applications where severe cold weather is of concern. The
auto-drain port will discharge the water remaining in the standpipe to an open-site drain that is
located below the roof line.
The Stainless Steel Shroud and Base allow the roof contractor to make a positive, weather
tight flashing to the Hydrant.
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.
Unpacking the Hydrant:
Parts Included:
Hydrant Assembly
Under-deck flange
Wye-strainer W/ brass nipple
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 1” set screws
4 – ¼” X 1 ½” hex head bolts
1 – 1/4” MIP X Compression Adapter
Verify that all assembly parts are present.
Recommended Installation Procedures:
Support Framing: We strongly recommend that prior to the installation of this roof mounted Pedestal Hydrant that a
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 of
these instructions.
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 hole to below
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.
MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
Page 1 of 4

Connections to the Water Source:
We recommend that a wye-strainer and valve be installed on the supply piping serving the hydrant. This valve should be
in a convenient and easily accessible location. Because the drain port operates as an auto-drain, a second drain-down
valve is not required between this port and the termination point of the discharge piping. The drain-down piping should
discharge open-site to a sanitary receptacle such as a mop sink. Local, governing plumbing codes should be followed
when installing this hydrant and making piping connections to the building water system. 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.
MAPA PRODUCTS MPH-24D PEDESTAL HYDRANT
Welded AngleFrame Detail
ID Dimension 12- 1
2inches square
Secure Angle Framing To Support Structure
Figure 1
Under-deck flange should
freely slide upward into
angle frame opening.
Installation of the Hydrant: A hole
approximately six inches (6”) 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 nozzle in the
desired direction.
Refer to Figure 2.
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.
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 lower portion of the
hydrant’s shroud. Snug the flange securely
to the deck and angle framing. Using the
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
Figure 2
Insert Hydrantthrough roof
insulation at center of angle
framing.
Slide Under-Deck flange over stainless
shroud snug to roof decking.
Attach with hardware. See Figure 3
Next, using the four (4) ¼” X 1” set screws,
securely fasten the under-deck flange to
the stainless tubing.
Refer to Figure 3 of the Instructions.
Water Supply Test: It is recommended
that the water supply be thoroughly tested
prior to activating the Hydrant. To avoid
damage to the valve ball, stem or seat, the
water supply system should also be purged
of all foreign materials before the supply
valve to the Hydrant is opened.
Winterizing - Severe Weather Drain-down: If the drain-down port on the ball valve of the hydrant discharges in a
downward sloping manner and is terminated open-site at a sanitary receptacle then there is no concern that the
assembly or stand-pipe will be subject to freezing. Caution: To insure positive discharge of the water remaining in the
stand-pipe after the valve is closed, any hose or fitting connected to the outlet of the hydrant should be removed.
MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
Page 2 of 4

Installation of the Supply and Drain Piping:. Make water supply and drain-down connections only after the under-deck
flange is securely attached to the Hydrant. Remove the plastic plug from the ball valve inlet. First install the factory
provided wye-stainer and then connect appropriate piping connections. Remove and discard the plastic plug from the
drain-down port. Install the provided 1/4” compression fitting. Connect copper tubing and discharge to a convenient
sanitary receptacle. See Figure 3
Where it is determined for the installation that no drain-down piping is necessary, a ¼” brass plug (not provided) should be
installed in the port. Teflon tape should be applied at the threaded connection.
Installation of the supply and drain-down piping should conform to standard plumbing practices and be in accordance with
local, governing codes. The drain-down piping should discharge to an open-site plumbing receptacle or other approved
device.
MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
Page 3 of 4

MAPA Products, LLC Box 129 Naples, Texas 75568 Phone [phone] Watts [phone] Fax [phone]
Page 4 of 4
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.
The hydrant should periodically be examined to insure that the working and operating parts function as intended. The
hose threads on the vacuum breaker should be free of indention that may cause a hose to not attach properly to the
hydrant. The vacuum breaker should function as intended allowing for air to enter the stand-pipe once the valve is closed
while barring fluids from back-flowing into the assembly.
The provided wye-strainer should be installed as shown in Figure 3, and at least annually be cleaned of debris.
Contamination in the water supply line may cause the valve to fail. The strainer screen mesh should be removed
and flushed and then re-installed prior to continued use of the hydrant.
Repairing the Ball Valve:
The ball valve and assembly is not intended for “in the field” repairs or replacement by those not trained as to the
technique of removal and re-assembly of the valve and piping assembly. If it does become necessary to make repairs to
this hydrant, contact an authorized factory service technician.
Replacing the Dome Handle:
If the dome handle is broken, replacements are available. Please contact your local MAPA Representative to obtain
repair parts.
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, alteration or improper usage is not warranted. The failure to install a
wye-strainer immediately upstream of the ball valve, and/or the failure to routinely clean the mesh screen in the strainer
may cause valve damage and will void the warranty. 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.