Pentair Minimax Ch Users Manual 472128_revB.p65

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MiniMax CH
®

POOL & SPA HEATERS
OPERATION & INSTALLATION MANUAL
WARNING
FOR YOUR SAFETY - READ BEFORE OPERATING
Warning: If you do not follow these instructions exactly, a fire or explosion may
result, causing property damage, personal injury or loss of life.
For additional free copies of this manual; call (800) 831-7133.

To
Consumer
Retain For
Future
Reference

U.S. Patent Numbers
6,295,980
5,318,007 - 5,228,618
5,201,307 - 4,595,825

WARNING
Warning: Improper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury or death. Installation and service must be
performed by a qualified installer, service agency or the gas supplier.

WHAT TO DO IF YOU SMELL GAS

For Your
Safety

•
•
•
•

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 neighbor's phone.
Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire department.

Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or other appliances.
Pentair Pool Products, Inc.
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 W. Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400
Rev. B 1-17-03

P/N 472128

Table of Contents
Introduction ...............................................................................................................

Important Notices ......................................................................................................................................................................

Warranty Information .................................................................................................................................................................

Operation ....................................................................................................................

Safety Rules ..............................................................................................................................................................................

Millivolt Lighting/Operation - Natural & Propane ........................................................................................................................

Operating (Controls) ..................................................................................................................................................................

Maintenance ...............................................................................................................

Maintenance Instructions ...........................................................................................................................................................

Relief Valve ................................................................................................................................................................................

Energy Saving Tips ....................................................................................................................................................................

Spring and Fall Operation ..........................................................................................................................................................

Winter Operation .......................................................................................................................................................................

Chemical Balance ......................................................................................................................................................................

Installation Instructions ............................................................................................

Specifications ..........................................................................................................................

Plumbing Connections ........................................................................................................... 10
Plumbing/Valves ........................................................................................................................................................................ 10
Manual Bypass ..........................................................................................................................................................................

Below Pool Installation ..............................................................................................................................................................

Water Connections.................................................................................................................. 11
Reverse Water Connections ......................................................................................................................................................

Insulating High Limits when Reversing Heads ...........................................................................................................................

Gas Connections ..................................................................................................................... 12
Gas Line Installation .................................................................................................................................................................. 12
Pipe Sizing Chart/Gas Pressure Requirements ......................................................................................................................... 12
Pipe Sizing Chart/Propane 2 Stage Regulation ......................................................................................................................... 13
Regulated Manifold Pressure Test .............................................................................................................................................

Ventilation ................................................................................................................................ 14
Outdoor Installation Requirements ............................................................................................................................................

Outdoor Cap Installation ............................................................................................................................................................ 14
Indoor Installation Requirements ............................................................................................................................................... 15
Installation on Floors Constructed of Combustible Materials ..................................................................................................... 16
Indoor Draft Hood Installation .................................................................................................................................................... 16

Electrical .................................................................................................................................. 17
Millivolt Wiring Diagram ............................................................................................................................................................. 17

Trouble Shooting (General) ....................................................................................... 18
MiniMax CH Parts List & Exploded View ................................................................. 19-21
MiniMax CH (150 IID Model) Appendix ..................................................................... A1-A9
MiniMax CH (150 IID Model) Parts List & Exploded View ....................................... A10-A12
Warranty Information .................................................................................................
P/N 472128

Back Cover

Rev. B 1-17-03

Introduction

MiniMax CH
Pool and Spa Heaters
Congratulations on your purchase of a MiniMax CH high performance heating system. Proper installation
and service of your new heating system and correct chemical maintenance of the water will ensure years of
enjoyment. The MiniMax CH is a compact, lightweight and efficient gas fired high performance pool and
spa heater that can be directly connected to schedule 40 PVC pipe and has a built-in top. The MiniMax CH
is a millivolt heater and has a self sustaining pilot and requires NO external power source.

IMPORTANT NOTICES
...For the installer and operator of the MiniMax CH pool and spa heater. The manufacturer’s warranty may
be void if, for any reason, the heater is improperly installed and/or operated. Be sure to follow the
instructions set forth in this manual. If you need any more information, or if you have any questions
regarding to this pool heater, please contact Pentair Pool Products, Inc. at (800) 831-7133.
These heaters are designed for the heating of swimming pools and spas, and should never be employed for
use as space heating boilers, general purpose water heaters, in non-stationary installations, or for the heating
of salt water.

CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 68° F. WILL CAUSE
HARMFUL CONDENSATION AND WILL DAMAGE THE HEATER AND WILL VOID THE WARRANTY.
Do not use the heater to protect pools or spas from freezing if the final maintenance temperature desired is
below 68° F. as this will cause condensation related problems.

CODE REQUIREMENTS
The installation must conform with local codes or in the absence of local codes with the latest
National Fuel Gas Code, ANSI Z223.1, and the latest edition of the National Electrical Code, NFPA 70.
Installation in Canada to be made in accordance with the latest CAN/CGA-B149.1 or .2 and
CSA C22.1 Canadian Electric Code, part 1.

Rev. B 1-17-03

P/N 472128

Operation (contd.)

This instruction manual provides operating
instructions, installation and service information for
the MiniMax CH high performance heater. The
information in this manual applies to the MiniMax
CH 150, 200, 250, 300, 350, and 400 natural gas
and propane (LP) models.
It is very important that the owner/installer read and
understand the section covering installation
instructions, and recognize the local and state codes
before installing the MiniMax CH. History and
experience has shown that most heater damage is
caused by improper installation practices.

WARRANTY INFORMATION
The MiniMax CH pool heater is sold with a limited
factory warranty. Specific details are described on
the back cover of this manual and a copy of the
warranty and warranty registration card are
included with the product. Return the warranty
registration card after filling in the serial number
from the rating plate inside the heater.
Pentair Pool Products’ high standards of excellence
include a policy of continuous product improvement
resulting in your state-of-the-art heater. We reserve
the right to make improvements which change the
specifications of the heater without incurring an
obligation to update the current heater equipment.

Operation

SAFETY RULES
1. Spa or hot tub water temperatures should never
exceed 104° F (40° C). A temperature of 100° F
(38° C) is considered safe for a healthy adult.
Special caution is suggested for young children.
2. Drinking of alcoholic beverages before or during
spa or hot tub use can cause drowsiness which
could lead to unconsciousness and subsequently
result in drowning.
3. Pregnant women beware! Soaking in water
above 102° F (39° C) can cause fetal damage
during the first three months of pregnancy
(resulting in the birth of a brain-damaged or
deformed child). Pregnant women should stick
to the 100° F (38° C) maximum rule.

4. Before entering the spa or hot tub, the user
should check the water temperature with an
accurate thermometer. Spa or hot tub
thermostats may err in regulating water
temperatures by as much as 4° F (2.2° C).
5. Persons with a medical history of heart disease,
circulatory problems, diabetes or blood pressure
problems should obtain their physician's advice
before using spas or hot tubs.
6. Persons taking medication which induce
drowsiness, such as tranquilizers, antihistamines
or anticoagulants should not use spas or hot
tubs.

WARNING
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the
appliance. Do not use this heater if any part has been under water. Immediately call a qualified service
technician to inspect the heater and to replace any part of control system and gas control which has been
under water.
P/N 472128

Rev. B 1-17-03

Operation (contd.)

MINIMAX CH MILLIVOLT LIGHTING/OPERATION-NATURAL GAS & PROPANE
FOR YOUR SAFETY: READ BEFORE LIGHTING

WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life
and property damage.
Since propane gas is heavier than air, escaping propane will accumulate and remain at ground level. Do not
attempt to light the heater. If you suspect a propane leak, lighting the heater can result in a fire or explosion
which can cause personal injury, death, and property damage.
A. This heater is equipped with a pilot which must be
lighted manually. When lighting the pilot, follow
these instructions exactly.
B. BEFORE LIGHTING smell all around the heater
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle
on the floor.
WHAT TO DO IF YOU SMELL GAS
- Do not try to light any heater.
- Do not touch any electrical switch; do not use any
phone in your building.
- Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.

If you cannot reach your gas supplier, call the Fire
Department.
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in or
turn by hand, don't try to repair it. Call a qualified
service technician. Forced or attempted repair may
result in a fire or explosion.
D. Do not use this heater if any part has been under
water. Immediately call a qualified service
technician to inspect the heater and to replace any
part of the control system and any gas control which
has been under water.

LIGHTING INSTRUCTIONS
1.
2.
3.
4.

STOP! Read the safety information above.
Set the thermostat to the lowest setting.
Turn off electric power to the heater.
Push in gas control knob slightly and turn clockwise
to “OFF”.

•

•
Robertshaw Millivolt Gas Valve

Figure 1.

Honeywell Millivolt Gas Valve

Figure 2.

Gas control knobs shown in “OFF” position.
NOTE
Knob cannot be turned from “Pilot to “OFF”” unless
knob is pushed in slightly. DO NOT FORCE.
5.
6.

Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Follow "B" in the safety information above. If you don't smell gas, go to the next step.
Push in gas control knob slightly and turn counterclockwise
to “Pilot”.

9.
10.

Push the control knob all the way and hold in.
Immediately light the pilot with Presslite matchless
ignition system by pressing the red igniter button
(located at the panel next to the gas valve). Continue
to hold the control knob in for about one (1) minute
after the pilot is lit. Release knob and it will pop
back up. Pilot should remain lit. If it goes out, repeat
steps 4 through 7.
If knob does not pop up when released, stop and
immediately call your service technician or gas
supplier.
Figure 3.
If the pilot will not stay lit
after several tries, turn the
gas control knob to “OFF”
and call your service
technician or gas supplier.
Turn knob on gas control
counterclockwise
to
“ON”.
Replace the control access
door.
Set the thermostat to the
Figure 4. Pilot
desired setting.

TO TURN OFF GAS TO HEATER
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the heater if service is
to be performed.
3. Remove control access door.
Rev. B 1-17-03

4. Push in gas control knob slightly and turn clockwise
to "OFF". Do not force.
5. Replace control access door.
P/N 472128

Operation (contd.)

OPERATING (CONTROLS)
Dual Temperature Control System
For convenience and economy all MiniMax CH
heaters are equipped with two thermostats on the
front of the heater control panel; see Figure 5.

POOL

THERMOSTAT KNOB STOPPER

SPA

OFF

Each thermostat is equipped with a mechanical
stop that can be locked or unlocked with use of a
screwdriver to prevent temperatures in excess of
that desired by the user; see Figure 6.

The maximum setting can be adjusted by
COLD POOL TEMP HOT COLD SPA TEMP
HOT
loosening the screw "A" and turning the stopper
dial to desired maximum setting. Lock the setting
Figure 5.
by tightening the screw. The Mechanical stop is
under the knob. Ensure that the knob is stopping at the correct position when the knob is rotated clockwise
from a lower temperature position. (See Thermostat Adjustment.)
NOTE
To eliminate error due to piping heat losses, measure pool temperature with an accurate
thermometer directly at the pool or spa.

THERMOSTAT ADJUSTMENT
The knob with locking feature eliminates the need for
constant thermostat adjustments. Set the knob pointer to
the desired pool or spa temperature.
If further adjustment is needed, rotate the knob until the
desired temperature is obtained. This knob position
corresponding to your desired maximum pool or spa
temperature may now be preset (locked) by the knob
stopper which prevents the knob from being turned
beyond the maximum temperature you set.

Knob Stopper

POWER (THERMOSTAT SELECT) SWITCH
The Pool/Off/Spa switch allows the heater to be turned
off when heating is not desired.

Figure 6.

Screw A

“Pool” position - Maintains selected pool temperature.

“Off” position - Heater will not come on regardless of drop in pool or spa temperature.

“Spa” position - This allows separate control of spa water temperature or an alternate lower pool
temperature.

P/N 472128

Rev. B 1-17-03

Maintenance
MAINTENANCE INSTRUCTIONS
It is recommended that you check the following items at least
every six months and at the beginning of every swimming
season.
1. Examine the venting system. Make sure there are no obstructions in the flow of combustion and ventilation air.
2. Visually inspect the main burner and the pilot burner
flame. The normal color of the flame is blue. When flame
appears yellow, burners should be inspected and cleaned;
see Figure 8.
3. Keep the heater area clear and free from combustibles
and flammable liquids.
Blue Flame

Figure 7.

Figure 8.

ENERGY SAVING TIPS
1. If possible, keep pool or spa covered when not in use.
This will not only cut heating costs, but also keep dirt and
debris from settling in the pool and conserve chemicals.
2. Reduce the pool thermostat setting to 78° F. or lower.
This is accepted as being the most healthy temperature
for swimming by the American Red Cross.
3. Use an accurate thermometer.
4. When the proper maximum thermostat settings have been
determined, tighten the thermostat knob stopper.

CAUTION
REMOVE THE FLOW VALVE ASSEMBLY WHEN DRILLING
THE HOLE TO INSTALL A PRV. OTHERWISE, YOU WILL
DRILL INTO THE VALVE ASSEMBLY.
Pressure Relief Valve
In some installations, a
Figure 9.
pressure relief valve
(PRV) is required on the
MiniMax CH heater. To
install a PRV, carefully
drill a 3/8 in. hole in
center of 3/4 in. NPT
port (on main header)
being careful to drill
REMOVE FLOW VALVE
only thru wall at bottom
BEFORE DRILLING
THE NPT PORT
of 3/4 in. NPT port and
no deeper—now thread
in the 3/4 NPT PRV. (Sold separately.)

FOR PRV
INSTALLATION
DRILL THRU
THE NPT PORT

5. Set time clock to start circulation system no earlier than
daybreak. The swimming pool loses less heat at this time.
6. For pools that are only used on the weekends, it is not
necessary to leave the thermostat set at 78° F. Lower the
temperature to a range that can be achieved easily in one
day. Generally, this would be 10° F. to 15° F., if pool
heater is sized properly.
7. During the winter or while on vacation, turn the heater off.
8. Set up a regular program of preventative maintenance
for the heater each new swimming season. Check heat
exchanger, controls, burners, operation, etc.

SPRING AND FALL OPERATION
If the pool is being used occasionally, do not turn the heater completely off. Set the thermostat down to 65° F. This will
keep the pool and the surrounding ground warm enough to bring the pool up to a comfortable swimming temperature in a
shorter period of time.

WINTER OPERATION

CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 68° F. WILL CAUSE HARMFUL
CONDENSATION AND WILL DAMAGE THE HEATER AND WILL VOID THE WARRANTY.
If the pool won't be used for a month or more, turn the heater off at the main gas valve. For areas where there is no danger of
water freezing, water should circulate through the heater all year long, even though you are not heating your swimming pool.
The MiniMax CH should not be operated out doors at temperatures below 0° F. for propane and -20° F. for natural gas. Where
freezing is possible, it is necessary to drain the water from the heater. This may be done by opening the drain valve located at
the inlet/outlet header (see Figure 9.) allowing all water to drain out of the heater. It would be a good practice to use
compressed air to blow the water out of the heat exchanger. (See additional notes under Important Notices in Introduction
on page 3.)
Rev. B 1-17-03

P/N 472128

Maintenance (contd.)

CHEMICAL BALANCE

RULE: 7.4 to 7.6 is a desirable pH range. It is essential
to maintain correct pH, see Table 2.

POOL AND SPA WATER

If pH becomes too high (over alkaline), it
has these effects:

Your Pentair Pool Products pool heater was designed
specifically for your spa or pool and will give you many
years of trouble free service provided you keep your
water chemistry in proper condition.
Three major items that can cause problems with your
pool heater are improper pH, disinfectant residual, and
total alkalinity. These items, if not kept properly
balanced, can shorten the life of the heater and cause
permanent damage.

CAUTION
Heat exchanger damage resulting from chemical
imbalance is not covered by the warranty.

WHAT A DISINFECTANT DOES
Two pool guests you do not want are algae and bacteria.
To get rid of them and make pool water sanitary for
swimming - as well as to improve the water's taste, odor
and clarity - some sort of disinfectant must be used.
Chlorine and bromine are universally approved by health
authorities and are accepted disinfecting agents for
bacteria control.

WHAT IS A DISINFECTANT
RESIDUAL?
When you add chlorine or bromine to the pool water, a
portion of the disinfectant will be consumed in the
process of destroying bacteria, algae and other
oxidizable materials. The disinfectant remaining is
called chlorine residual or bromine residual. You can
determine the disinfectant residual of your pool water
with a reliable test kit, available from your local pool
supply store.
You must maintain a disinfectant residual level adequate
enough to assure a continuous kill of bacteria or virus
introduced into pool water by swimmers, through the air,
from dust, rain or other sources.
It is wise to test pool water regularly. Never allow
chlorine residual to drop below 0.6 ppm (parts per
million). The minimum level for effective chlorine or
bromine residual is 1.4 ppm.
pH - The term pH refers to the acid/alkaline balance of
water expressed on a numerical scale from 0 to 14. A test
kit for measuring pH balance of your pool water is
available from your local pool supply store; see Table 1.

pH Chart

Table 1.
Strongly Acid
0

Neutral
4

Strongly Alkaline
10

Muriatic Acid has a pH of about 0. Pure water is 7
(neutral). Weak Lye solution have a pH of 13-14.
P/N 472128

1. Greatly lowers the ability of chlorine to destroy
bacteria and algae.
2. Water becomes cloudy.
3. There is more danger of scale formation on the
plaster or in the heat exchanger.
4. Filter elements may become blocked.

If pH is too low (over acid) the following
conditions may occur:
1. Excessive eye burn or skin irritation.
2. Etching of the plaster.
3. Corrosion of metal fixtures in the filtration and
recirculation system, which may create brown, blue,
green, or sometimes almost black stains on the
plaster.
4. Corrosion of copper in the heater, which may cause
leaks.
5. If you have a sand and gravel filter, the alum used as
a filter aid may dissolve and pass through the filter.

CAUTION: Do not test for pH when the chlorine
residual is 3.0 ppm or higher, or bromine residual
is 6.0 ppm or higher. See your local pool supply
store for help in properly balancing your water
chemistry.
RULE: Chemicals that are acid lower pH. Chemicals
that are alkaline raise pH.

pH Control Chart

Table 2.
6.8

7.0

7.2

Add Soda, Ash or
Marginal
Sodium Bicarbonate

7.4 7.6

7.8

Ideal

Marginal

8.0

8.2

8.4

Add Acid

ALKALINITY High - Low:
"Total alkalinity" is a measurement of the total amount
of alkaline chemicals in the water, and control pH to a
great degree. (It is not the same as pH which refers
merely to the relative alkalinity/acidity balance.) Your
pool water's total alkalinity should be 100 - 140 ppm to
permit easier pH control.
A total alkalinity test is simple to perform with a
reliable test kit. You will need to test about once a
week and make proper adjustments until alkalinity is
in the proper range. Then, test only once every month
or so to be sure it is being maintained. See your local
pool dealer for help in properly balancing the water
chemistry.
Rev. B 1-17-03

Installation Instructions
SPECIFICATIONS
IMPORTANT NOTICE: These installation instructions are designed for use by qualified personnel
only, trained especially for installation of this type of heating equipment and related components. Some
states require installation and repair by licensed personnel. If this applies in your state, be sure your
contractor bears the appropriate license.
Outdoor installation - stackless
Model

"A" Dim

"B" Dim

POOL

SPA

OFF

HIGH PERFORMANCE HEATER
COLD POOL TEMP

150

17 7/8 in.

6½ in.

200

20 7/8 in.

9½ in.

250

23 7/8 in.

12½ in.

300

26 7/8 in.

15½ in.

350

29 7/8 in.

18½ in.

400

33 3/8 in.

22 3/8 in.

HOT COLD

SPA TEMP

HOT

13 7
8

51
2

"B" DIM.
"A" DIM.
4.875
FRONT VIEW

21 1
2
SIDE VIEW

Table 3.

Outdoor installation - with vent kit
Model

"A" Dim

"B" Dim

"C" Dim

"D" Dim

150

17 7/8 in.

6½ in.

7¾ in.

39¾ in.

200

20 7/8 in.

9½ in.

10 in.

42¾ in.

"E" DIM.

"C"
DIM.

"D"
DIM
POOL

250

23 7/8 in.

12½ in.

10 in.

42¾ in.

300

26 7/8 in.

15½ in.

10¼ in.

43¾ in.

350

29 7/8 in.

18½ in.

13 in.

47¾ in.

400

33 3/8 in.

22 3/8 in.

17 in.

51¾ in.

SPA

OFF

HIGH PERFORMANCE HEATER
COLD POOL TEMP

HOT COLD

SPA TEMP

HOT

28"

51
2

"B" DIM.
"A" DIM.
4.875

Table 4.

211
2

"E" DIM.

Indoor installation - stack (USA only)
Outdoor shelter installation (Canada)
Model

"A" Dim

"B" Dim

"C" Dim

"D" Dim

"E" Dim

150

17 7/8 in.

6½ in.

13 in.

52¾ in.

6 in.

200

20 7/8 in.

9½ in.

13 in.

53 7/8 in.

7 in.

250

23 7/8 in.

12½ in.

13 in.

53 7/8 in.

7 in.

300

26 7/8 in.

15½ in.

13 in.

55 in.

8 in.

350

29 7/8 in.

18½ in.

13 in.

56 in.

9 in.

400

33 3/8 in. 22 3/8 in.

17 in.

60¾ in.

10 in.

"C"
DIM.
"D"
DIM

POOL

SPA

OFF

HIGH PERFORMANCE HEATER
COLD POOL TEMP

HOT COLD

SPA TEMP

HOT

Table 5.
Rev. B 1-17-03

13 7
8

10 7
8
GAS LINE
OPENING

51
2

"B" DIM.
211
2

"A" DIM.
4.875

P/N 472128

Installation (contd.)

POOL

THERMOSTAT

SELECT

OFF

SPA

COLD
POOL
TEMP

HOT
COLD
SPA

MANUAL BY-PASS

TEMP

HOT

PUMP

TO
POOL

POOL
HEATER

FILTER
3

MANUAL
BY-PASS

ISOLATION
VALVE

CHECK
VALVE

Where the flow rate exceeds the maximum 120
GPM, a manual bypass should be installed and
adjusted. After adjustments are made, the valve
handle should be removed to avoid tampering.

ISOLATION
VALVE

1
2
3

Optional.
Required when installation is below water level.
Required when flow rates exceed 120 gpm.

CHECK
VALVE

FROM
POOL

Model

Min.

Max. *

150

120

PLUMBING CONNECTIONS

200

120

The MiniMax CH heater has the unique capability of
direct schedule 40 PVC plumbing connections.

250

120

300

120

350

120

400

120

Figure 10.

CAUTION
Before operating the heater on a new installation,
turn on the circulation pump and bleed all the air
from the filter using the air relief valve on top of the
filter. Water should flow freely through the heater.
Do not operate the heater unless water in the pool/
spa is at the proper level.

Table 6.

BELOW POOL INSTALLATION
If the heater is below water level, the pressure
switch should be adjusted. This adjustment must
be done by a qualified service technician.
See following CAUTION.

PLUMBING
VALVES
When any equipment is located below the surface
of the pool or spa, valves should be placed in the
circulation piping system to isolate the equipment
from the pool or spa.
Check valves are recommended to prevent back
siphon.

CAUTION
Exercise care when installing chemical feeders so
as to not allow back siphoning of chemical into the
heater, filters or pump. When chemical feeders are
installed in the circulation of the piping system,
make sure the feeder outlet line is down stream of
the heater, and is equipped with a positive seal
non-corrosive “Check Valve”, (P/N R172288),
between the feeder and heater.

P/N 472128

* Do not exceed the maximum recommended
flow rate for the connecting piping.

CAUTION
BELOW OR ABOVE POOL INSTALLATION
The water pressure switch is set in the factory at 1½
PSI. This setting is for a heater installed at pool level or
within 3’ above or 3’ below. If the heater is to be installed
more that 3’ above or 3’ below, the water pressure switch
must be adjusted by a qualified service technician.
FLOW SWITCH
If the heater is installed more the 6’ above the pool or
more than 10’ below the pool level, you will be beyond
the limits of the pressure switch and a flow switch must
be installed. Locate and install the flow switch externally
on the outlet piping from the heater, as close as possible
to the heater. Connect the flow switch wires in place of
the water pressure switch wires.
Rev. B 1-17-03

Installation (contd.)

WATER CONNECTIONS

INSULATING THE HIGH LIMITS

Reversible Inlet/Outlet Connection

When Reversing Heads on the
MiniMax CH Heater

The MiniMax CH heater is factory assembled with
right side inlet/outlet water connections. The inlet/
outlet header can be reversed for left side water
connections without removing the heat exchanger.
Reversing Water Connections
Disassembly
Tools needed:
1/4 in Nut Driver
9/16 in. Socket and Wrench
1/2 in. & 9/16 in. Open Wrench
Screw Driver(s) - (Flathead & Phillips)

On the MiniMax CH heater there is insulation installed
by the factory on the return head side of the heaters.
This insulation is there so that if the heads are reversed
in the field, during initial installation of the heater, the
reflected heat from the flue collector will be insulated
from the high limits.
Return head in position before removal.
This view shows the insulation installed by the factory.

1. Remove the inspection plates.
2. Disconnect all wires from the high-limit
switches except the short jumper wire. The
exact order of the disconnection is not
important.
NOTE
There is no reason to remove the high-limit
and pressure switches or the thermister from the
front header during the reversing procedure, as
they will be in the proper location when
installed on the left side.

Return head removed and new tube seals installed. Now
ready to accept the installation of the main head.

3. Disconnect the pressure switch wiring.
4. Disconnect the thermostat thermister leads from
the control board.
5. Exchange the in/out header with the return
header. Replace the heat exchanger tube seals
with new seals provided in the Quick-Flange
Accessory Bag.
6. Install the temperature sensing bulb by passing
the wires through the hole provided on the left
side of the brace panel. Route wires through the
support bracket.

Lift the installation to allow the main head to be installed.
When head is placed into position, release the insulation;
it will now shield the high limits from the heat produced
by the flue collector.

7. Reconnect all the high limit wires. Reconnect
the pressure switch wiring. Route the wires
through the same hole as the thermostat sensor
wires and reconnect thermister to the board.
8. Reinstall the inspection plates.

Rev. B 1-17-03

P/N 472128

Installation (contd.)

GAS CONNECTIONS
GAS LINE INSTALLATIONS
Before installing the gas line, be sure to check which gas the heater has been designed to burn. This is
important because different types of gas require different gas pipe sizes. The rating plate on the heater will
indicate which gas the heater is designed to burn. Tables 7-9, on pages 12 and 13, shows which size pipe is
required for the distance from the gas meter to the heater. The table is for natural gas at a specific gravity
of .65 and propane at specific gravity of 1.5.
When sizing gas lines, calculate three (3) additional feet of straight pipe for every elbow used.
When installing the gas line, avoid getting dirt, grease or other foreign material in the pipe as this may cause
damage to the gas valve, which may result in heater failure.
The gas meter should be checked to make sure that it will supply enough gas to the heater and any other
appliances that may be used on the same meter.
The gas line from the meter will usually be of a larger size than the gas valve supplied with the heater.
Therefore a reduction of the connecting gas pipe will be necessary. Make this reduction as close to the
heater as possible.
The heater and any other gas appliances must be disconnected from the gas supply piping system during any
pressure testing on that system, (greater that ½ PSIG).
The heater and its gas connection must be leak tested before placing the heater in operation. Do not use
flame to test the gas line. Use soapy water or another nonflammable method.
A manual main shut-off valve must be installed externally to the heater.

WARNING
Do not install the gas line union inside the heater cabinet. This will void your warranty.
Pipe Sized For Length Of Run In Equivalent Feet

Table 7.

PIPE SIZING FOR GAS LINE CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH
Natural gas at 1000 B.T.U. per Cubic Foot
Propane Gas at 2500 B.T.U. per Cubic Foot

1/2”

P/N 472128

3/4”

1”

1-1/4”

1-1/2”

2”

2-1/2”

MODEL

NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO

75 & 100

20’

50’

150’

150’ 600’

150

10’

40’

50’

150’

150’ 600’

200

20’

30’

80’

125’ 250’

450’

600’

250

10’

20’

50’

70’

150’ 250’

500’

600’

300

10’

30’

50’

100’ 200’

350’

400’

600’

350

10’

20’

30’

70’

125’ 250’

250’

500’

400

10’

20’

60’

100’

150’ 200’

450’

400’

525

5’

15’

35’

65’

150’

130’ 360’

390’

700’

600’

750

20’

35’

80’

75’

180’ 260’

900

15’

20’

50’

45’

80’

150’ 360’

400’

Rev. B 1-17-03

Installation (contd.)

Pipe Sized For Length Of Run In Equivalent Feet, (cont’d.)

PROPANE 2 STAGE REGULATION
In many “RESIDENTIAL” Propane gas line installations, the gas supplier and or installer will utilize a two stage regulation
process where by at the supply tank they will install the first stage gas regulator, which would be at a higher pressure, usually
10 psi and can be for longer distance and in a smaller pipe size. Then within a short distance from the heater they will install
a second regulator, which is the second stage, and this would be set at the reguired inlet pressure of 11 inches of W.C. for all the
Pentair Pool Heaters.

Stage One "High Pressure" Gas Pipe Sizing

Stage Two "Low Pressure" Gas Pipe Sizing

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0 to 50 Feet

75 & 100

1/2 in.

Model

50 to 100 Feet 100 to 150 Feet
1/2 in.

0 to 10 Feet

10 to 20 Feet

1/2 in.

75 & 100

1/2 in.

150

1/2 in.

150

200

1/2 in.

200

1/2 in.

3/4 in.

250

1/2 in.

250

1/2 in.

3/4 in.

300

1/2 in.

300

3/4 in.

350

1/2 in.

350

3/4 in.

400

1/2 in.

400

3/4 in.

3/4 in.
Table 9.

Table 8.

REGULATOR
ADJUSTMENT CAP

REGULATED MANIFOLD PRESSURE TEST
1. Attach the manometer to the heater jacket.
2. Shut off the main gas valve.
3. Remove 1/8 in. NPT plug on the outlet side of
the valve and screw in the fitting from the
manometer kit.
4. Connect the manometer hose to the fitting.
5. Fire the heater.
6. The manometer must read 4 in. WC for natural
gas, 11 in. WC for propane gas, while the heater
is operating.
7. For adjustment, remove the Regulator
Adjustment Cap and using a screwdriver turn the
screw clockwise to increase - counterclockwise
to decrease gas pressure.

CAUTION
The use of Flexible Connectors (FLEX) is NOT
recommended as they cause high gas pressure drops.

Rev. B 1-17-03

PILOT
HONEYWELL

Figure 11.

1/2 P.S.I.
PILOT
ADJ.

PRESS
TAP

MINIMAX CH GAS PRESSURE REQUIREMENTS*
Natural

Propane

Maximum inlet gas pressure 10 in. WC 14 in. WC
Minimum inlet gas pressure **5 in. WC 12 in. WC
Normal manifold pressure
4 in. WC 11 in. WC
** 6 WC for 400 model
*All Readings are taken with the heater fired. Any adjustments
made with heater off will give incorrect readings.
Table 10.

P/N 472128

Installation (contd.)

VENTILATION

STACK TYPE OUTDOOR VENT KIT

OUTDOOR INSTALLATION ONLY
For outdoor installation with built in vent top, the heater
must be placed in a suitable area on a level,
noncombustible surface. Do not install the heater under
an overhang with clearances less than 3 feet from the top
of the heater. The area under an overhang must be open
on three sides.

IMPORTANT!

Model

Vent Cap

Product No.

Vent Dia.

150

OV15

460237

6 in.

200

OV20

460222

7 in.

250

OV25

460223

7 in.

300

OV30

460224

8 in.

350

OV35

460225

9 in.

400

OV40

460226

10 in.

In an outdoor installation it is important to protect
your heater from water damage. Ensure water is
diverted from overhanging eves with a proper gutter/
drainage system. The heater must be set on a level
foundation for proper rain drainage.

Table 11.

Outdoor Stack

Top Cover

Maintain minimum clearances as indicated below. Install
a minimum of 4 feet below, and 4 feet horizontally from
any opening to a building.

Flue Adaptor

Inner Panel

The heater should not be installed closer than 6 inches to
any fences, walls or shrubs at any side or back, or any
combustible material, nor closer than 18 inches at the
plumbing side. A minimum clearance of 24 inches must
be maintained at the front of the heater.

Flue Collector

DOOR

Figure 13.

Figure 14.

24"

OUTDOOR VENT CAP INSTALLATION
18"

Figure 12.

IMPORTANT!
When locating the heater, consider that high
winds can roll over or deflect off adjacent
buildings and walls. Normally, placing the
heater at least three feet from any wall will
minimize downdraft.

Unusually high prevailing wind conditions and
downdrafts may require the use of a stack type
outdoor vent kit (available at additional cost).
NOTE
This unit shall not be operated outdoors at
temperatures below 0o F. for propane and -20o F. for
natural gas.
P/N 472128

The MiniMax CH heater is shipped standard as an
outdoor stackless unit. To install the outdoor vent kit:
1. Take out the louvered outer top after first
removing all 1/4 in. sheet metal screws attaching
it along its perimeter to the cabinet. Set it aside.
2. Place the flue adaptor over the flue collector
opening. Temporarily, put the top cover, from the
kit, on with the label to the front of the heater.
Center the flue adaptor evenly inside the top cover
flue stack opening. Remove the top cover and
secure the centered flue adaptor to the inner panel
with the provided #8 x 1/2 in. drill qwik screws.
3. Place the top cover, with the hole for the stack, on
the heater cabinet.
4. Install the vent stack through the hole in the top
cover, over the flue adaptor top ring.
5. Using a 3/32 in. drill bit, position the “L” bracket
to hold the top cover and outdoor stack. Drill the
pilot holes through the “L” bracket holes to accept
the screws.
6. Secure the vent stack and the inner top with the
#8 x 1/4 in. sheet metal screws through the “L”
brackets.
Rev. B 1-17-03

Installation (contd.)

INDOOR INSTALLATION (USA ONLY)
OUTDOOR SHELTER INSTALLATION
(CANADA)
All products of combustion and vent gases must be
completely removed to the outside atmosphere
through a vent pipe which is connected to the draft
hood. A vent pipe extension of the same size must
be connected to the draft hood and extended at least
2 feet higher than highest point of the roof within a
10 foot horizontal radius, and at least 3 ft. higher
than the point at which it passes through the roof, or
as permitted by local code; see Figures 15 and 16.
The vent should terminate with an approved vent
cap (weather cap) for protection against rain or
blockage by snow. Double-wall vent pipe and an
approved roof jack shall be employed through the
roof penetration. The use of double-walled type B
vent pipe is recommended.

Installations in basements, garages, or
underground structures where flammable liquids
may be stored must have the heater elevated 18
inches from the floor using a non-combustible
base. The following minimum clearances from
combustible materials must be provided.
Side

Front

Back

Top

;;;
;;;
;;;

The draft hood must be installed so as to be in the
same atmospheric pressure zone as the
combustion air inlet to the pool heater. The
certified (factory) draft hood must not be
modified in any way and must be employed in
every indoor installation.

Water Connection

18 in.

Remaining

24 in.

6 in.

Ceiling Clearance

36 in.*

*To ceiling or roof.

More Than10 ft.

Height above
any roof surface
within 10 ft.
horizontally

10 ft.

Vent Cap

Ridge

2 ft. min.

3 ft. min.

Roof
Jack

The heater must be located as close as practical to
a chimney or gas vent. The heater should be
installed at least 5 feet away from the pool or spa.

Chimney

Figure 15.

The heater must be placed in a suitable room on a
non-combustible floor or on a non-combustible
base and in an area where leakage from heat
exchanger or water connections will not result in
damage to the area adjacent to the heater or the
structure. When such locations cannot be
avoided, it is recommended that a suitable drain
pan with adequate drainage, be installed under the
heater. The pan must not restrict air flow.

Vent Cap and
Riser Furnished
by Installer

* Rise

* 1” Rise Per Foot
Recommended

Air Supply
Ventilation

Air Supply
Gas Combustion

Figure 16.
Rev. B 1-17-03

P/N 472128

Installation (contd.)

NOTE
The heater requires two uninterrupted air supply
openings; one for ventilation and one to supply oxygen
for proper gas combustion. The air supply openings
should be sized according to Tables 12. and 13.

b) Construct a non-combustible base from masonry
blocks as illustrated, see Figure 17.
BASE FOR USE ON
COMBUSTIBLE FLOORS

T
O
H

Air supply requirements below apply to all
MiniMax heaters

CE
RMAN
PERFO

R
HEATE

HIGH

ES
EL
TC

All opening sizes are minimum and unobstructed.

POOL

HT
RE
OM
TS
TA

SPA

OFF

HOT
TEMP
SPA

COLD
HOT
TEMP
POOL

COLD

All Air From Inside
Model

Air for Combustion
Sq. In.

Air Ventilation
Sq. In.

150

200

250

300

350

400

Table 12.

SHEET
METAL
HOLLOW MASONARY BLOCKS, NOT LESS THAN
4" THICK (LAID WITH ENDS UNSEALED AND JOINTS
MATCHED FOR AIR CIRCULATION). COVER BLOCKS
WITH 24 GA. (MIN.) GALVANIZED SHEET METAL.

BLOCKS

Figure 17.

CAUTION
Chemicals should not be stored near the heater
installation. Combustion air can be contaminated by
corrosive chemical fumes which can void the warranty.

All Air From Outside
Model

Air for Combustion
Sq. In.

Air Ventilation
Sq. In.

150

200

STACK TYPE INDOOR DRAFT HOOD KIT
The proper draft hood and adapter must be installed on
the heater as shown below:

250

Model

300

150

DH15

460227

6 in.

350

200

DH20

460228

7 in.

400

100

250

DH25

460230

7 in.

300

DH30

460231

8 in.

350

DH35

460233

9 in.

400

DH40

460234

10 in.

Draft Hood Product No.

Vent Dia.

Table 13.

INSTALLATION ON FLOORS CONSTRUCTED
OF COMBUSTIBLE MATERIALS
The heater may be placed on a “combustible floor”
using either of the two methods listed below:
a) Use Listed Factory Non-combustible Base Kit
for use on combustible floors.
Model

Non-Combustible Base Kit

150

471389

200

471390

250

471391

300

471392

350

471393

400

471394

Table 14.
P/N 472128

Table 15.

INDOOR DRAFT HOOD INSTALLATION
1. Take out the louvered outer top piece after first
removing the sheet metal screws, attaching it to
Draft Hood
the cabinet.
Top Cover
2. Install the adaptor
Adaptor
(vent kit).
Screw
(2 PLC's)
3. Install the top cover
(vent kit).
4. Install the draft hood
(vent kit).
Use the provided screws
HEATER
to secure the vent
assembly.
Figure 18.
Rev. B 1-17-03

Installation (contd.)

ELECTRICAL
MiniMax CH Millivolt Wiring Diagram

MINIMAX WIRING DIAGRAM (MILLIVOLT) DUAL THERM
(HONEYWELL ELECTRONIC)
IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA (IF CANADA)
APPROVED WIRE, 18 GAUGE, 600V, 105 C˚ TEMPERATURE RATING. THERMAL FUSE WIRING MUST BE
REPLACED WITH UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 125 C˚ TEMPERATURE RATING.
INTERCONNECTING WIRING TO APPLIANCE MUST CONFORM TO THE NATIONAL ELECTRICAL CODE OR
SUPERCEDING LOCAL (WIRING) CODES.

TH/PP

PILOT
GENERATOR

WHT
RED

GAS VALVE

SAFETY
SHUT-OFF

HI-LIMIT

WHT

PRESS
SWITCH
WHT

WHT

THERMAL
CUT-OFF
ORN
WHT

TH/PP

WHT

POT 1

POT 2

POT

SEN

THERMOSTAT BOARD

POOL
OFF

SENSOR

SPA

Figure 19.

NOTE: When connecting a remote control to the MiniMax CH, you must install the low voltage
thermostat wires in separate conduit from ANY line voltage wires. Failure to follow these
instructions will cause the thermostat relay to react erratically..

Rev. B 1-17-03

P/N 472128

Troubleshooting - General
Possible Cause

Remedy

Heater will not come on
Pump not running
Place pump in operation
Pump air locked
Check for leaks
Filter dirty
Clean filter
Pump strainer clogged
Clean strainer
Defective wiring or connection
Repair or replace wires
Defective pressure switch
Replace switch
Defective gas controls
Call serviceperson
On-Off switch in "OFF" position
Turn switch to "ON"
Heater Short Cycling (Rapid On and Off Operation)
Insufficient water flow
Clean filter and pump strainer
Defective wiring
Repair or replace wiring
Defective flow valve or out of adjustment
Call serviceperson
Defective hi-limit and/or thermostat
Call serviceperson
Heater Makes Knocking Noises,
Make sure all valves on system are open
Heater operating after pump has shut off
Heater exchanger scaled

Shut off gas supply and call serviceperson
Shut off gas supply and call serviceperson

CAUTION
Please consult the latest edition of the “MiniMax Service Manual” for complete service and repair
instructions. Repairs should only be attempted by properly trained service personnel.

P/N 472128

Rev. B 1-17-03

MINIMAX CH HEATER - ALL MODELS

H
O
T

INNER TOPS
M ode l No.

Part No.

150

470024

200

470025

250

470026

300

470027

350

470028

400

470029

30
28

4
20
1

15
27
23
24

22
18

21
5

34
7

8
36
17

33
14

10
11
12

Rev. B 1-17-03

P/N 472128

MiniMax CH Parts List
ITEM DESCRIPTION

QTY

150

200

250

300

350

400

Vent kit assy. (indoor)

460227

460228

460230

460231

460233

460234

Vent kit assy. (outdoor)

460237

460222

460223

460224

460225

460226

Return header

070994

Bolt, heat exchanger

471991

Washer 3/8" ID 1" OD

072184

Tube seal gasket

070951

Thermostat knob

470184

Switch rocker (single pole & double throw)

470186

Control panel assy. (complete) - Millivolt

472175

472174

472173

472172

472171

472170

Door - Millivolt

075468

075604

075488

075605

075606

075490

Manifold burner

070256

075525

070257

075526

075527

070258

Gas valve natural - Millivolt

075457

Gas valve propane - Millivolt

075458

076084

076085

076086

11
12
13

Pilot tube - Millivolt
Burner tray assy. natural (complete) - Millivolt

075493

075496

075494

075497

075498

075495

Burner tray assy. propane (complete) - Millivolt

075502

075505

075503

075506

075507

075504

2 EA.

3 EA.

4 EA.

5 EA.

6 EA.

7 EA.

070230

Burner

14a Burner with pilot bracket (not shown)

470550

Pressure switch

471672

Combustion chamber assy. (complete)

073858

075586

073857

075587

075588

073856

Presslite igniter assy.

075459

Potentiometer

471678

Flow valve assy.

471750

Hi-Limit thermostat 115°

471587

Adaptor - bulkhead, 2 in.

471441

Adaptor - bulkhead ring

274440

Main manifold assy.

471993

Main header assy.

471992

Main manifold bottom

471419

Cap, main manifold bottom

471420

Hi-Limit thermostat 150°

471694

Heat exchanger (without heads)

472131 472132

472133

472134

472135

472136

Heat exchanger (with heads)

472169

472168

472167

472166

472165

472164

8 ea.

16 ea.

070277

075559

070276

075560

070277

070278

073810

28
29
30

Baffle
Baffle hold down (2) baffles on 400

P/N 472128

Rev. B 1-17-03

MiniMax CH Parts List, contd.
ITEM DESCRIPTION

QTY

150

200

250

300

350

400

Flue collector

073864 075622 073863 075623 075624 073862

Outdoor top assy.

470471 470472 470473 470474 470475 470476

Lightback shield (Propane Gas units only)

075783 075784 075785 075786 075787 075788

Electronic thermostat (Millivolt models)

471677 471677

Panel (return)

073789 073789 073789 073789 073789 073789

Panel (in/out)

472127 472127 472127 472127 472127 472127

Thermistor (probe) complete (Millivolt models)

472101 472101 472101 472101 472101 472101

471677 471677

* N ot S how n
*

Plastic mounting bracket

070715 070715 070715 070715 070715 070715

Clips for wire harness

471277 471277 471277 471277 471277 471277

Wire Kit - Millivolt

075511

Screw 8 x 1/4" HH

071703 071703 071703 071703 071703 071703

Screw 8 x 1/2" HH

071698 071698 071698 071698 071698 071698

Screw 6 x 1/4"

071716 071716 071716 071716 071716 071716

Screw 10 -32 x 1/4"

071659 071659 071659 071659 071659 071659

Screw 10-32 x 3/16

075692 075692 075692 075692 075692 075692

Bushing 1/2"

070551 070551 070551 070551 070551 070551

Therm knob stopper

470414 470414

Bolt 5/16" - 18 x 3/4'

075511

470414 470414

075511

470414 470414

*
*

Orifice main burner natural

073725 073725 073725 073725 073725 073725
3 ea.
4 ea.
5 ea.
6 ea.
7 ea.
8 ea.
N or P
N or P
N or P
N or P
N or P
N or P
073727 073727 073727 073727 073727 073727

Orifice main burner propane

073728 073728 073728 073728 073728 073728

Pilot - natural - Millivolt

471292 471292 471292 471292 471292 471292

Pilot - propane - Millivolt

471291 471291 471291 471291 471291 471291

Pilot - generator

071515 071515 071515 071515 071515 071515

Thermal cutoff - fusible link

075173 075173 075173 075173 075173 075173

Power element (flow-valve)

470178 470178 470178 470178 470178 470178

Pilot rainshield

471293 471293 471293 471293 471293 471293

Pilot electrode (only)

471328 471328 471328 471328 471328 471328

"L" brackets

074540 074540 074540 074540 074540 074540

Bracket adapter Q379 pilot, MV

471271 471271 471271 471271 471271 471271

Jumper

072253 072253 072253 072253 072253 072253

Door latch

071240 071240 071240 071240 071240 071240

Rev. B 1-17-03

P/N 472128

NOTES

P/N 472128

Rev. B 1-17-03

1 1
23

MiniMax CH (150 IID Model)
®

POOL & SPA HEATERS
OPERATION & INSTALLATION MANUAL
(APPENDIX)
WARNING
FOR YOUR SAFETY - READ BEFORE OPERATING
Warning: If you do not follow these instructions exactly, a fire or explosion may
result, causing property damage, personal injury or loss of life.
For additional free copies of this manual; call (800) 831-7133.

U.S. Patent Numbers
6,295,980
5,318,007 - 5,228,618
5,201,307 - 4,595,825

WHAT TO DO IF YOU SMELL GAS

For Your
Safety

•
•
•
•

A-1

P/N 472128

Operation

MINIMAX CH (150 IID) ELECTRONIC IGNITION LIGHTING/OPERATION - NATURAL GAS
FOR YOUR SAFETY: READ BEFORE LIGHTING

WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life
and property damage.
Do not attempt to light the heater if you suspect a natural gas leak. Lighting the heater can result in a fire or
explosion which can cause personal injury, death, and property damage.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, don't try to repair it.
Call a qualified service technician. Forced or
attempted repair may result in a fire or explosion.
D. Do not use this heater if any part has been under
water. Immediately call a qualified service
technician to inspect the heater and to replace
any part of the control system and any gas
control which has been under water.
E. The MiniMax CH incorporates (9) nine
indicator lights to aid you in the operation of the
heater, and to assist in diagnosing a failure in the
heater’s function.

A. This heater is equipped with an ignition device
which automatically lights the pilot. Do not try
to light the pilot by hand.
B. BEFORE OPERATING smell all around the
heater area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
- Do not try to light any heater.
- Do not touch any electrical switch; do not use
any phone in your building.
- Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
- If you cannot reach your gas supplier, call the
Fire Department.

OPERATING INSTRUCTIONS
1.
2.
3.
4.

STOP! Read the safety information above.
Set the thermostat to the lowest setting.
Turn off electric power to the heater.
This heater is equipped with an ignition device
which automatically lights the pilot. Do not try
to light the pilot by hand.
5. Remove the control access door.
6. Push in gas control knob slightly and turn clockwise
to “OFF”.
7. Wait five (5) minutes to clear out any gas. If you
then smell gas, STOP! Follow "B" in the safety
information above. If you don't smell gas, go to the
next step.
8. Turn knob on gas control counterclockwise
to “ON”; see Figure 1.

9.
10.
11.
12.

Replace the control access door.
Turn on the electrical power to the heater.
Set the thermostat to the desired setting.
If the heater will not operate, follow the instructions "To Turn Off Gas To Heater" and call your
service technician or gas supplier.

Gas
Inlet
ON

OFF

Figure 1.

Gas control knob shown in “ON” position.

TO TURN OFF GAS TO APPLIANCE
4. Push in gas control knob slightly and turn
clockwise
to "OFF". Do not force.
5. Replace control access door.

1. Set the thermostat to lowest setting.
2. Turn off all electric power to the heater if
service is to be performed.
3. Remove control access door.
P/N 472128

A-2

Rev. B 1-17-03

Operation (contd.)

MINIMAX CH (150 IID) ELECTRONIC IGNITION LIGHTING/OPERATION - PROPANE
FOR YOUR SAFETY: READ BEFORE LIGHTING
NOTE
The MiniMax CH propane models have special features for additional safety and protection.
Read the safety instructions for natural gas (page A-2) before proceeding.

Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
If you cannot reach your gas supplier, call the
Fire Department.
Do not tamper with the heater because it is
dangerous and voids all warranties.

Safety Lockout:
This MiniMax CH Propane Heater is equipped with a 100% safety lockout feature. If the pilot does not light
within a maximum of 90 seconds, lockout will occur.

OPERATING INSTRUCTIONS
1.
2.
3.
4.

STOP! Read the safety information above.
Set the thermostat to the lowest setting.
Turn off electric power to the heater.
This heater is equipped with an ignition device
which automatically lights the pilot. Do not try to
light the pilot by hand.
5. Remove the control access door.
6. Push in gas control knob slightly and turn clockwise
to “OFF”.
7. Wait five (5) minutes to clear out any gas. If you
then smell gas, STOP! Follow "B" in the safety
information on page 5. If you don't smell gas, go to
the next step.
8. Turn knob on gas control counterclockwise
to “ON”; see Figure 2.

9.
10.
11.
12.

Gas
Inlet
ON

OFF

Figure 2.

Gas control knob shown in “ON” position.

TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the heater if
service is to be performed.
3. Remove control access door.
Rev. B 1-17-03

4. Push in gas control knob slightly and turn
clockwise
to "OFF". Do not force.
5. Replace control access door.

A-3

P/N 472128

Operation (contd.)

OPERATING (CONTROLS)
Dual Temperature Control System - (Electronic and Millivolt Models)
For convenience and economy all MiniMax CH heaters
are equipped with two thermostats on the front of the heater
control panel; see Figure 3.

Figure 3.

THERMOSTAT KNOB STOPPER
Each thermostat is equipped with a mechanical stop that
can be locked or unlocked with use of a screwdriver to
prevent temperatures in excess of that desired by the user;
see Figure 4.
The maximum setting can be adjusted by loosening the screw
"A" and turning the stopper dial to desired maximum setting.
Lock the setting by tightening the screw. The Mechanical
stop is under the knob. Ensure that the knob is stopping at the
correct position when the knob is rotated clockwise from a
lower temperature position. (See Thermostat Adjustment.)

Knob Stopper

Figure 4.

Screw A

POWER (THERMOSTAT SELECT) SWITCH
The Pool/Off/Spa switch allows the heater to be turned off
when heating is not desired.
1. “Pool” position - Maintains selected pool
temperature.
2. “Off” position - Heater will not come on regardless
of drop in pool or spa temperature.
3. “Spa” position - This allows separate control of spa
water temperature.

NOTE
To eliminate error due to piping heat losses,
measure pool temperature with an accurate
thermometer directly at the pool or spa.

INDICATOR LIGHT DESCRIPTION
The MiniMax Pool Heater provides nine status indicator lights, six can be seen from the front of the control panel which
help you understand the operation of the heater. If something should go wrong, the lights will aid in troubleshooting the
problem. Three additional lights can be seen after opening the control panel. These three lights give the service technician
advanced troubleshooting capability. All the LED lights are green with the exception of the red service LED.
POWER LIGHT (POWER)
The light is on at all times, in any switch position, indicating
24 VAC power is being supplied to the control circuit. If it
fails to light, no other light will be on. Possible causes are:
a) external power to the heater is disconnected, check
service panel circuit breaker or fuses; b) local circuit
breaker inside the transformer has tripped -- investigate
cause before resetting; c) transformer has failed.
THERMOSTAT (TSTAT)
This light is on when the thermostat contacts close, signaled
by the water temperature falling below the setpoint, calling
for the heater to fire to maintain the desired water
temperature.
P/N 472128

AUXILIARY (AUX)
This light is on when it indicates the remote switch contacts
are closed. This allows you to observe if your remote switch
is properly closing the heater control circuit. When shipped
from the factory a jumper is installed to maintain closed
circuit in the absence of a remote switch.
PRESSURE (PRESS)
This light is on when Spa/Pool Selector switch is on,
indicates the circulation pump is running properly. If
pressure light fails to light, the pump may have lost its
prime or water flow may be restricted by an inadvertently
closed valve or clogged filter or pump basket. If you have
determined that there is no water flow restriction to the
heater, you should call a qualified serviceman.
A-4

Rev. B 1-17-03

Operation (contd.)

SERVICE (SERVICE)
The service light is off during normal operation of
heater. The light only comes on if a problem with a
control has occurred or when the heater is first
firing. The problem must be investigated by the
serviceman prior to attempts to fire the heater again.

HEAT (HEAT)
The heat light is on any time the thermostat has
signaled a call for heat which initializes the ignition
safety firing circuit -- the light comes on to indicate
successful firing of the main burners.

The diagrams that follow give examples of
troubleshooting a malfunctioning heater using the
assistance of the indicator lights.

TROUBLESHOOTING (CONTROLS)
Example of troubleshooting with the assistance of the indicator lights.

SYMBOL TABLE

LED LIT

SWITCH OR DEVICE
OPEN CIRCUIT
(BLOCK CURRENT)

LED OFF

SWITCH OR DEVICE
CLOSED CIRCUIT
(PASS CURRENT)

IGNITION MODULE

IND
INCOMING
LINE VOLTAGE

TRANSFORMER

CIRCUIT
BREAKER

REMOTE

PRESS

HI TEMP
LIMIT SWITCHES

GND

VAL

TFUSE

GAS VALVE
MV

THERMOSTAT
RELAY
PWR

THERM

POWER

AUX

SERVICE

TSTAT

RMT

PRESS

HI TEMP

TFUSE

HEAT

SRVE
CLOSE IF
NO MV

THERMOSTAT CIRCUIT BOARD

PRESS

WATER AT SELECTED TEMPERATURE.... NORMAL OPERATION
OR POOL/OFF/SPA THERMOSTAT SELECT SWITCH OFF.... NORMAL OPERATION

HEAT
FRONT PANEL LEDS

IGNITION MODULE

IND
INCOMING
LINE VOLTAGE

TRANSFORMER

CIRCUIT
BREAKER

REMOTE

PRESS

HI TEMP
LIMIT SWITCHES

GND

VAL

TFUSE

GAS VALVE
MV

THERMOSTAT
RELAY
PWR
THERM

POWER

AUX

SERVICE

TSTAT

RMT

HI TEMP

PRESS

TFUSE

HEAT

SRVE
CLOSE IF
NO MV

THERMOSTAT CIRCUIT BOARD

PRESS

HEAT
FRONT PANEL LEDS

Rev. B 1-17-03

THERMOSTAT CALLING FOR HEAT - PUMP OFF(NO PRESSURE) BLOCKS FIRING
NORMAL OPERATION

A-5

P/N 472128

Operation (contd.)

TROUBLESHOOTING (CONTROLS) - Continued

SYMBOL TABLE

LED LIT

SWITCH OR DEVICE
OPEN CIRCUIT
(BLOCK CURRENT)

LED OFF

SWITCH OR DEVICE
CLOSED CIRCUIT
(PASS CURRENT)

IGNITION MODULE

IND
INCOMING
LINE VOLTAGE

TRANSFORMER

CIRCUIT
BREAKER

REMOTE

HI TEMP
LIMIT SWITCHES

PRESS

GND

VAL

TFUSE

GAS VALVE
MV

THERMOSTAT
RELAY
PWR

THERM

POWER

AUX

SERVICE

TSTAT

RMT

PRESS

HI TEMP

TFUSE

HEAT

SRVE
CLOSE IF
NO MV

THERMOSTAT CIRCUIT BOARD

PRESS

HEATER FIRING - NORMAL OPERATION
HEAT
FRONT PANEL LEDS

IGNITION MODULE

IND
INCOMING
LINE VOLTAGE

TRANSFORMER

CIRCUIT
BREAKER

REMOTE

HI TEMP
LIMIT SWITCHES

PRESS

GND

VAL

TFUSE

GAS VALVE
MV

THERMOSTAT
RELAY
PWR
THERM

POWER

AUX

SERVICE

TSTAT

RMT

PRESS

HI TEMP

TFUSE

HEAT

SRVE
CLOSE IF
NO MV

PRESS

THERMOSTAT CIRCUIT BOARD

HEAT
FRONT PANEL LEDS

P/N 472128

THERMOSTAT CALLING FOR HEAT - BLOWN THERMAL FUSE BLOCKS FIRING
NOTE: SERVICE LED LIT FLAGS PROBLEM, TFUSE LED OFF SHOWS PROBLEM
IS IN THERMAL FUSE CIRCUIT

A-6

Rev. B 1-17-03

Installation

REGULATED MANIFOLD PRESSURE TEST

Regulator Adjustment Cap
1/8" NPT Plug
(Inlet Press)

1. Attach the manometer to the heater jacket.
2. Shut off the main gas valve.
ON

3. Remove 1/8 in. NPT plug on the outlet side of the valve and
screw in the fitting from the manometer kit.

OFF
1/8" NPT Plug
(Manifold Press)

4. Connect the manometer hose to the fitting.
5. Fire the heater.

REGULATOR
ADJUSTMENT CAP

6. The manometer must read 4 in. WC for natural gas,
11 in. WC for propane gas, while the heater is operating.
7. For adjustment, remove the Regulator Adjustment Cap and
using a screwdriver turn the screw clockwise to increase counterclockwise to decrease gas pressure.

PILOT
HONEYWELL
1/2 P.S.I.
PILOT
ADJ.

ELECTRICAL, IID ELECTRONIC UNITS
Electrical Rating
60 Hz
50/60 Hz

PRESS
TAP

Transformer Wiring Instruction

115 V.A.C. or 230 V.A.C.
208 V.A.C. or 240 V.A.C.
NOTE

If any of the original wiring supplied with this
heater must be replaced, installer must supply
(No. 18 AWG 105° C. U.L. approved AWM low
energy stranded) copper wire or it's equivalent.
In Canada: wires must be CSA approved.

WARNING
The heater must be electrically grounded and
bonded in accordance with local codes or, in the
absence of local codes, with the latest national
electrical codes ANSI/NFPA No. 70.
In Canada: CSA standard C22.1 Canada Electrical
Code Part 1 and/or local codes.
Always use crimp type connectors when connecting
two wires.
This heater is equipped with a reversible junction box
to allow line voltage to be wired from either side.

Figure 6.

Figure 5.
Rev. B 1-17-03

A-7

P/N 472128

BLK

WHT/BLK

WHT/RED

RED

GRN

L2-1

L1-1

A-8
POOL

COM

SPA

POOL OFF SPA

AUX.
CONTACTS

TPROBE

THERMOSTAT SELECT SWITCH

CLOSE ON CALL
FOR HEAT

CONTROL RELAY

J7
1

JI0

VLV

PI0

BLK

P11

THERMOSTAT

J11

CIRCUIT BOARD

IGN MODULE

TEMPERATURE
PROBE

GRN

MV
PV/MV
PV

IGNITION WIRE

BLU

24V

MV/PV

ORG

RED

GRN

IGNITION RETURN

RED
WHT
BLU

THERMAL FUSE

WHT

25D K .032 D.C TAB

WHT

RED

WHT
ORG

WATER PRESSURE
SWITCH

L2-2

L1-2

HIGH LIMIT
THERMAL SWITCHES

CHASSIS
SHEET METAL

IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY
UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 105 C TEMPERATURE RATING.
THERMAL FUSE WIRING MUST BE REPLACED WITH UL OR CSA (IF CANADA) APPROVED
WIRE, 18 GAUGE, 600V, 125 C TEMPERATURE RATING..
INTERCONNECTING WIRING TO APPLIANCE MUST CONFORM TO THE NATIONAL ELECTRICAL
CODE OR SUPERCEDING LOCAL (WIRING) CODES.

WIRING
DIAGRAM
MiniMax CHMiniMax
150 IIDPlus
Wiring
Diagram

6
5
4
3
2
1
2
1

JUMPER REQUIRED IF NO REMOTE SWITCH

SPST. EXTERNAL ON/OFF SWITCH

CHASSIS
SHEET METAL

TERMINATE SUPPLY SAFETY GROUND WIRE (GREEN) HERE
GROUND SCREW WITH PAINT CUTTING WASHER

3
2
1

HLMT

PRESS

P/N 472128
PLUG

TFUSE

EXTERNAL
BOND LUG

SPARK IGNITER

SPARK

TH-W
( OPT )

24 V

GND

PV
GND
(BURNER)

MV/PV

IGNITION MODULE

PV/MV
PV

GAS VALVE

Installation (contd.)
30

MiniMax CH (150 IID Model) Electronic Ignition Wiring Diagram

PLUG

Rev. B 1-17-03

Installation (contd.)

REMOTE SWITCH DUAL THERM IID ONLY
JUMPER REQUIRED IF NO 2 WIRE REMOTE SWITCH

3 Wire Remote
EXT SWITCH

24 VAC
OUT

PRESS HILMT

TFUSE

VALVE

IGNITION MOD

RETURN

THERMOSTAT CIRCUIT BOARD

SPA

COM

POOL

TPROBE

REMOTE POOL/OFF/SPA
THERMOSTAT SELECT SWITCH

FRONT PANEL
POOL/
OFF/SPA
THERMOSTAT SELECT SWITCH

Figure 7.

2 Wire Remote

JUMPER REQUIRED IF NO 2 WIRE REMOTE SWITCH

EXT SWITCH

24 VAC
OUT

PRESS HILMT

TFUSE

VALVE

IGNITION MOD

RETURN

THERMOSTAT CIRCUIT BOARD

SPA

COM

POOL

TPROBE

Figure 8.
FRONT PANEL
POOL/OFF/SPA
THERMOSTAT SELECT SWITCH

A-9

P/N 472128

MINIMAX CH HEATER - 150 IID MODEL

H
O
T

INNER TOP
M ode l No.

Part No.

150

470024

30
28

4
20
1

15
27
23
24

22
25

21
5

8
36
37

33
14

10
11
12

P/N 472128

A-10

Rev. B 1-17-03

MiniMax CH Parts List - 150 IID Model
ITEM DESCRIPTION

QTY

150

Vent kit assy. (indoor)

460227

Vent kit assy. (outdoor)

460237

Return header

070994

Bolt, heat exchanger

471991

Washer 3/8" ID 1" OD

072184

Tube seal gasket

070951

Electronic Thermostat circuit board - IID Model

470179

Switch rocker (single pole & double throw)

470186

Control panel assy. (complete) - IID Natural

472151

Control panel assy. (complete) - IID Propane

472191

Door - Millivolt or IID

075468

Manifold burner

070256

Gas valve Natural - IID

073998

Gas valve Propane - IID

073999

11
12
13

Pilot tube - IID

075191

Burner tray assy. Natural (complete) - IID

073752

Burner tray assy. Propane (complete) - IID

073906
2 EA.

Burner

14a

Burner with pilot bracket (not shown)

470550

Pressure switch

471672

Combustion chamber assy. (complete)

073858

Transformer - w/circuit breaker - dual voltage

471360

Thermostat knob

470184

Flow valve assy.

471750

Hi-Limit thermostat 115°

471587

Adaptor - bulkhead, 2 in.

471441

Adaptor - bulkhead ring

274440

Main manifold assy.

471993

Main header assy.

471992

Main manifold bottom

471419

Cap, main manifold bottom

471420

Hi-Limit thermostat 150°

471694

Heat exchanger (without heads)

472131

Heat exchanger (with heads)

472169

28
29
30
Rev. B 1-17-03

070230

8 ea.
070277

Baffle
Baffle hold down (2) baffles on 400

A-11

073810
P/N 472128

MiniMax CH Parts List - 150 IID Model, contd.
ITEM DESCRIPTION

QTY

150

Flue collector

073864

Outdoor top assy.

470471

Lightback shield (Propane Gas units only)

075783

Module Natural Gas

073584

Module Propane Gas

073585

Panel (return)

073789

Panel (in/out)

472127

Thermistor (probe) complete - IID

471566

Junction Box

470122

* N ot S how n

P/N 472128

Plastic mounting bracket

070715

Clips for wire harness

471277

Wire Kit - Millivolt

075511

Screw 8 x 1/4" HH

071703

Screw 8 x 1/2" HH

071698

Screw 6 x 1/4"

071716

Screw 10 -32 x 1/4"

071659

Screw 10-32 x 3/16

075692

Bushing 1/2"

070551

Therm knob stopper

470414

Bolt 5/16" - 18 x 3/4'

*
*

Orifice main burner natural

073725
3 ea.
N or P
073727

Orifice main burner propane

073728

Pilot - natural - Millivolt

471292

Pilot - propane - Millivolt

471291

Pilot - generator

071515

Thermal cutoff - fusible link

075173

Power element (flow-valve)

470178

Pilot rainshield

471293

Pilot electrode (only)

471328

"L" brackets

074540

Bracket adapter Q379 pilot, MV

471271

Jumper

072253

Door latch

071240

A-12

Rev. B 1-17-03

NOTES

Rev. B 1-17-03

A-13

P/N 472128

40
36

MiniMax® CH Heaters
Limited Warranty
Your MiniMax CH pool heater is another quality product from Pentair Pool Products, Inc.
and is backed by the following warranty.
1. The following parts are warranted for 5 years from date of purchase:
The MiniMax CH cabinet and combustion chamber, the main burners and burner
manifold, the inlet/outlet header and the return header. This warranty does not cover
rusting or corrosion on cabinets or burners that does not affect the heater's operation.
2. The following parts are covered for 2 years from date of purchase:
The automatic flow control valve, all controls, heat exchanger, pilot generator and the
pilot assembly.
This warranty only applies to the original purchaser.
3. This warranty shall not apply to any units or parts which have been subject to accident,
negligence, alteration, abuse, misapplication or misuse.
The above warranty applies only if the heater is installed and operated in complete
compliance with the installation and operation manual provided with each unit. Copies of
this manual are available by writing to Pentair Pool Products, Inc., at the address below.
Pentair Pool Products, Inc. assumes no liability except for the repair or replacements of
parts as specified above. Ship defective parts or equipment along with serial number and
purchase date, transportation prepaid to the address below. Purchaser shall be responsible
for freight charges for return of merchandise to purchaser. Some states do not allow
exclusion or limitation of incidental or consequential damages so the above may not apply
to you.
This warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
HEATER SERIAL NUMBER

(Please Fill In)
Pentair Pool Products, Inc.
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 W. Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400

P/N 472128

Rev. B 1-17-03

Source Exif Data:

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Create Date                     : 2003:03:31 13:59:02-06:00
Modify Date                     : 2003:04:03 13:34:26-05:00
Page Count                      : 36
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Mod Date                        : 2003:03:31 19:59:02Z
Producer                        : Acrobat Distiller 5.0.5 (Windows)
Author                          : kcarie
Metadata Date                   : 2003:03:31 19:59:02Z
Creator                         : kcarie
Title                           : 472128_revB.p65

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