IMPORTANT: Store these instructions in the packet provided on the boiler
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
®
WARNING
If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency, or gas
supplier.
Moorpark, California (8 A.M. to 5 P.M.)
Phone: (800) 831-7133
Fax: (800) 284-4151
Web sites: visit www.pentairpool.com and www.staritepool.com
MegaTherm Commercial Pool Heating Boiler
Page 3
SECTION 1.
General Information
IMPORTANT WARNING:
The MegaTherm Model MT commercial pool
boilers must be used with potable water only.
For pools containing salt water, a specially
equipped boiler must be used. Consult your
distributor or factory representative. The pool
boiler must be installed in accordance with the
procedures in this manual, or the warranty
could be voided. Consult local building codes
and ANSI bulletin Z223.1 or in Canada CAN1B149 before proceeding with the installation.
Any modification to the boiler, its gas controls,
gas orifices, wiring or draft diverter may void
the warranty. Consult the factory before making
any modifications.
1A. Introduction
This manual provides information for the
installation and operation of Model MT Pool Boilers. It
is strongly recommended that all application and
installation procedures be reviewed completely before
proceeding with the installation. Consult the Pentair
Water Commercial Pool and Spa technical support
(see page 2), or your local representative, with any
problems or questions regarding this equipment.
Experience has shown that most operating problems
are caused by improper installation.
Model MT boilers are offered in two
configurations: an indoor version and an outdoor
version. The indoor version is convertible for outdoor
use with the installation of a conversion kit as
described in Section 6 of this manual. The two
configurations are shown in Figure 1.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on the
packing slip. Inspect everything for damage
immediately upon delivery, and advise the carrier of
any shortages or damage. Any such claims should be
filed with the carrier. The carrier, not the shipper, is
responsible for shortages and damage to the shipment
whether visible or concealed.
SECTION 2.
Installation
2A. Boiler Placement
The Model MT boiler must be placed to provide
clearances on all sides for maintenance and inspection.
There must also be minimum distances maintained
from combustible surfaces.
Figure 1. Boiler Configuration - Series MT.
Page 4
Pentair Water Commercial Pool and Spa
All boilers must be installed on a non-combustible
floor. Under no circumstances can boilers be installed
on carpeting. The National Fuel Code allows a boiler
to be placed on other than a non combustible surface
when such an installation complies with the local
codes. This code specifies the surface under the boiler
be protected with hollow masonry no less than 4" thick,
covered with sheet metal at least 20 gage in thickness.
Such masonry must be laid with ends unsealed, and
joints matched in such a way as to provide a free
circulation of air from side to side through the masonry
(see Figure 2).
ClearanceIndoorOutdoor
From(Inches)(Inches)
Top24—
Water Conn. Side2424
Opposite Side2424
Front4848
Rear2424
Vent6—
Table 1. Minimum Boiler Clearance
From Combustible Surfaces
cause accelerated deterioration of controls and
electrical components.
3.Exhaust Fans or Vents: Any equipment which
exhausts air from the boiler room can deplete the
combustion air supply or reverse the natural draft
action of the venting system. This could cause
flue products to accumulate in the room.
Additional air must be supplied to compensate
for such exhaust. The information in Table 2 is
not applicable in installations where exhaust
fans or blowers of any type are used. Such
installations must be designed by qualified
engineers.
Blocks must provide solid base and be braced so they cannot
slip out of place. Air openings in blocks must be arranged to
provide unobstructed opening through entire width or length of
base.
Figure 2. Non-Combustible Base.
2B. Installation of Indoor Boilers
2B-1. Combustion Air Supply
1.The boiler location must provide sufficient air
supply for proper combustion, and ventilation of
the surrounding area as outlined in the latest
edition of ANSI standard Z223.1 or, in Canada
CAN1-B149, and any local codes that may be
applicable. Inadequate combustion air supply
may result in incomplete combustion and
consequent sooting of the heat exchange and
unsafe operation of the boiler.
2.In general, (in the U.S.), these requirements
specify that equipment rooms which represent
confined spaces should be provided with two
permanent air supply openings communicating
directly through the wall to outside air; one
within 12 inches of the ceiling, the other within
12 inches of the floor. Each opening should have
a minimum free area of one square inch per
4,000 BTUH input of the total input rating of all
appliances in the enclosed area. These
requirements differ in Canada. Consult the
National Standard of Canada CAN1-B149 for
details. See Table 2 for recommended air supply
for U.S. models. An improperly ventilated
equipment room can get excessively hot and
*Area indicated is for one of two openings: one at floor level
and one at the ceiling, so the total net free area would be
double the figures indicated. For all other conditions, refer to
latest edition of ANSI A223.1.
NOTE: Check with louver manufacturers for Net Free Area of
louvers. Correct for screen resistance to the Net Free Area if
a screen is installed. Check all local codes applicable to
combustion air.
Table 2. Minimum Recommended Air
Supply to Equipment Room.
4.If a blower or fan is used to supply air to the
equipment room, the installer should make sure it
does not create drafts which could cause
nuisance shut-downs of the pilot. If a blower is
necessary to provide adequate combustion air to
the boiler, a suitable switch or equivalent must
be wired into the boiler control circuit to prevent
the boiler from firing unless the blower is
operating.
5.The boiler must be completely isolated and
protected from any source of corrosive chemical
fumes such as emitted by trichlorethylene,
perchlorethylene, chlorine, etc.
MegaTherm Commercial Pool Heating Boiler
Page 5
2B-2. Venting
1.Model MT boilers have built-in draft diverters for
natural draft operation and must not be
connected into any portion of a mechanical draft
system under positive pressure. The flue outlet
must be connected to a clear, unobstructed vent
of adequate capacity terminating above the
highest point of the building with an approved
vent cap. The venting system should be installed
according to the latest edition of ANSI Z223.1
(or CAN1-B149) and any local codes having
jurisdiction.
IMPORTANT NOTE: Do not use sheet metal
screws at the snap lock joints of Type B gas vents.
2.Do not weld or fasten the vent pipe to the boiler
draft hood. The weight of the stack must not rest
on the boiler. The draft hood and top must be
easily removable for normal boiler service and
inspection.
3.Avoid long horizontal runs of the vent pipe, and
too many 90 degree elbows, reductions and
restrictions. Horizontal runs should have at least
a 1/4” rise per foot in the direction of flow. A
vent connector shall be supported for the design
and weight of the material employed to maintain
clearances and prevent physical damage and
separation of joints.
4.Avoid terminating boiler vents near air
conditioning or air supply fans. The fans can
pick up exhaust flue products from the boiler and
return them inside the building, creating a
possible health hazard. A minimum of 4 feet
horizontal distance must be maintained from
electric meters, gas meters, and relief equipment.
5.Always use double-wall or insulated vent pipe
(Type B or equivalent). In cold weather,
uninsulated outside vents can chill the rising flue
products, blocking the natural draft action of the
venting system. This can create a health hazard
by spilling flue products into the boiler room.
6.Avoid oversize vent piping or extremely long
runs of the pipe which may cause excessive
cooling and condensation. Rule of Thumb: The
total length of the vent, including the connector
and any offset, should not exceed 15 feet for
every inch of vent diameter. Longer total lengths
shown in venting tables are based on maximum
capacity, not condensation factors.
7.When the installation of a draft fan is necessary
in the venting system to which a Model MT
boiler is to be connected, the installation should
be engineered by competent personnel following
good engineering practices. The draft fan
supplier should be consulted for correct size. The
installation should be in accordance with the
latest edition of ANSI Z223.1 and any local
codes having jurisdiction. When a draft fan is
installed, a suitable draft switch must be used
and wired into the boiler control circuit at
terminal designated “Field Interlock,” to prevent
firing of the unit unless a positive draft has been
established (see Figure 3).
Figure 3. Draft Fan Wiring Diagram.
2C. Installation of Outdoor Units
1.Locate the boiler to provide the minimum
clearances as listed in Section 2A, “Boiler
Placement.”
2.Do not locate the boiler in an enclosure or wall
recess. Avoid locations where wind deflection
off structures might cause down draft. When
such wind conditions are possible, locate the unit
at least three (3) feet from the structures.
3.Never install the boiler under any kind of roof
overhang. Do not locate the unit below or
adjacent to any doors, windows, louvers, grills,
etc. which communicate in any way with an
inhabited area of a building. Even though such
communication might be through another
structure such as a garage or utility room (see
Figure 4).
Figure 4. Incorrect Outdoor Installation.
Page 6
4.Liquified petroleum is heavier than air.
Therefore, the pool boiler should not be installed
in pits or other locations where gas could
accumulate. The boiler should be located a safe
distance from LP gas storage and filling
equipment. Consult local codes and fire
protection authorities for advice relative to
specific installation restrictions.
2D. Freeze Protection
Boiler installations are not recommended in areas
where the danger of freezing exists unless proper
precautions are made for freeze protection.
Pentair Water Commercial Pool and Spa
Figure 5. Tee Fitting Sediment Trap.
2E. Gas Supply and Piping
Review the following instructions before
proceeding with the installation.
1.Verify that the boiler is fitted for the proper type
of gas by checking the rating plate. Model MT
boilers are normally equipped to operate below a
2000 foot altitude. Boilers equipped to operate at
higher altitudes have appropriate stickers or tags
attached.
2.Use the figures in Table 3 to provide adequate
gas piping (check local code for BTU capacity
required).
NOTES:
These figures are based on ½" water column pressure drop.
Check supply pressure and local code requirements before
proceeding with work.
Pipe fittings must be considered when determining gas pipe
sizing.
must be isolated from the gas supply piping
system by closing its individual manual gas
shutoff valve during any pressure testing of the
gas supply piping system at test pressures equal
to or less than 1/2 psig.
5.Provide gas supply pressure to the boiler as
follows:
NaturalPropane
Min. (inches water column)711
Max. (inches water column)914
Note: The boiler and all other gas appliances
sharing the gas supply line must be firing at maximum
capacity to properly measure the inlet supply pressure.
Low gas pressure could be an indication of an
undersized gas meter and/or obstructed gas supply
line.
6.The correct burner manifold gas pressure is
stamped on the rating plate. The regulator is
preset at the factory, and normally requires no
further adjustment.
7.The gas manifold and control assembly was
tested and conforms to the safe lighting and other
performance criteria specified in the latest
editions of ANSI Z21.13 and CGA 3.3 Low
Pressure Boiler Standard.
8.Before operating the boiler, the complete gas
supply system and all connections must be tested
for leaks using a soap solution. Do not use raw
flame.
3.A trap (drip leg) must be provided ahead of the
gas controls (see Figure 5). Where required by
code, provide a second manual gas shutoff valve.
Do not remove manual valve furnished with the
unit.
4.The boiler and its individual shutoff valve must
be disconnected from the gas supply piping
system during any pressure testing of that system
at test pressures in excess of 1/2 psig. The boiler
Caution
Since some leak test solutions, including soap
and water, may cause corrosion or stress
cracking, the piping must be rinsed with water
after testing, unless it has been determined
that the leak test solution is noncorrosive.
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