1
®
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
•
•
•
Do not try to light any appliance.
For Your
Safety
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. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
3
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. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Operation (contd.)
4
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.
PRODUCT IDENTIFICATION
To identify the heater, see rating plate on the inner front panel of the
heater. There are two designators for each heater, one is the Model
Number and the other is the Heater Identification Number (HIN).
a. Model Number:
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
Example: 400
1st through 3rd character indicated: Input rating (Btu/hr) X 1000
b. Heater Identification Number (HIN):
improper installation practices.
The following example simplifies the identification system.
1
2
3
4
5
6
WARRANTY INFORMATION
HTR
400
CH
Blank N M Blank
The MiniMax CH pool heater is sold with a limited factory
warranty. Specific details are described on the warranty
registration card which is included with the product. Return
the warranty registration card after filling in the serial number
from the rating plate inside the heater.
1) HTR : Heater
2) (150, 200, 250, 300, 400) : Input rating (Btu/hr) X 1000
3) CH : MiniMax CH
4) Blank : Standard Model
5) N M : Gas type (Natural gas) & Ignition Device
6) Options :
Blank: Standard Model
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.
ASME: ASME Certified (Bronze Headers)
ASHI: ASME Certified Bronze Header & High Altitude Rating
HALT: High Altitude Rating
CAN: Canadian Compliance
CANH: Canadian Compliance and High Altitude
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.
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).
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.
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.
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.
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. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
Operation (contd.)
5
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.
-
If you cannot reach your gas supplier, call the Fire
Department.
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.
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.
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.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off electric power to the heater.
7. 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.
4. Push in gas control knob slightly and turn clock-
wise
to “OFF”.
•
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
Robertshaw Millivolt Gas Valve
Honeywell Millivolt Gas Valve
Figure 1.
Figure 2.
Gas control knobs shown in “OFF” position.
technician or gas supplier.
NOTE
Knob cannot be turned from “Pilot to “OFF”” unless
knob is pushed in slightly. DO NOT FORCE.
8. Turn knob on gas control
counterclockwise
“ON”.
to
5. Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Follow "B" in the safety informa-
tion above. If you don't smell gas, go to the next step.
6. Push in gas control knob slightly and turn counter-
9. Replace the control access
door.
10. Set the thermostat to the
desired setting.
Figure 4.
Pilot
clockwise
to “Pilot”.
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.
4. Push in gas control knob slightly and turn clockwise
to "OFF". Do not force.
5. Replace control access door.
3. Remove control access door.
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Operation (contd.)
6
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
SPA
THERMOSTAT KNOB STOPPER
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
HOT COLD
HOT
Figure 5.
POOL TEMP
SPA TEMP
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.)
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
Screw A
Figure 6.
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 or an alternate lower pool
temperature.
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
7
Maintenance
MAINTENANCE INSTRUCTIONS
CAUTION
REMOVE THE FLOW VALVE ASSEMBLY WHEN DRILLING
THE HOLE TO INSTALL A PRV. OTHERWISE, YOU WILL
DRILL INTO THE VALVE ASSEMBLY.
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 ob-
structions in the flow of combustion and ventilation air.
Pressure Relief Valve
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.
In some installations, a
pressure relief valve
(PRV) is required on the
MiniMax CH heater. To
install a PRV, carefully
drill a 3/8 in. hole in
Figure 9.
FOR PRV
INSTALLATION
DRILL THRU
THE NPT PORT
center of 3/4 in. NPT
port (on main header)
being careful to drill
Blue Flame
REMOVE FLOW VALVE
BEFORE DRILLING
THE NPT PORT
only thru wall at bottom
of 3/4 in. NPT port and
no deeper—now thread
in the 3/4 NPT PRV. (Sold separately.)
Figure 7.
Figure 8.
ENERGY SAVING TIPS
5. Set time clock to start circulation system no earlier than
daybreak. The swimming pool loses less heat at this time.
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.
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.
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.
7. During the winter or while on vacation, turn the heater off.
3. Use an accurate thermometer.
8. Set up a regular program of preventative maintenance
for the heater each new swimming season. Check heat
exchanger, controls, burners, operation, etc.
4. When the proper maximum thermostat settings have been
determined, tighten the thermostat knob stopper.
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. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Maintenance (contd.)
8
RULE: 7.4 to 7.6 is a desirable pH range. It is essential
to maintain correct pH, see Table 2.
CHEMICAL BALANCE
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.
1. Greatly lowers the ability of chlorine to destroy
bacteria and algae.
2. Water becomes cloudy.
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.
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:
CAUTION
Heat exchanger damage resulting from chemical
imbalance is not covered by the warranty.
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.
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.
4. Corrosion of copper in the heater, which may cause
leaks.
Chlorine and bromine are universally approved by health
authorities and are accepted disinfecting agents for
bacteria control.
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.
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.
RULE: Chemicals that are acid lower pH. Chemicals
that are alkaline raise pH.
pH Control Chart
Table 2.
7.2
7.4 7.6
7.8
8.0 8.2 8.4
Add Acid
6.8
7.0
Add Soda, Ash or
Marginal Ideal Marginal
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.
Sodium Bicarbonate
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.
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.
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.
Table 1.
Strongly Acid
pH Chart
Neutral
Strongly Alkaline
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14
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
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
9
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
POOL
SPA
Model
150
"A" Dim
17 7/8 in.
20 7/8 in.
23 7/8 in.
26 7/8 in.
29 7/8 in.
"B" Dim
6½ in.
OFF
TM
CH
HIGH PERFORMANCE HEATER
COLD
HOT COLD
HOT
POOL TEMP
SPA TEMP
32
200
9½ in.
7
8
13
250
12½ in.
15½ in.
18½ in.
1
2
"B" DIM.
"A" DIM.
5
300
1
2
21
4.875
350
FRONT VIEW
SIDE VIEW
400
33 3/8 in. 22 3/8 in.
Table 3.
Outdoor installation - with vent kit
"E" DIM.
"C"
DIM.
Model
"A" Dim "B" Dim "C" Dim "D" Dim
150
200
250
300
350
400
17 7/8 in.
20 7/8 in.
23 7/8 in.
26 7/8 in.
29 7/8 in.
6½ in.
9½ in.
7¾ in.
10 in.
10 in.
10¼ in.
13 in.
17 in.
39¾ in.
42¾ in.
42¾ in.
43¾ in.
47¾ in.
"D"
DIM
POOL
SPA
OFF
TM
CH
HIGH PERFORMANCE HEATER
COLD
H
O
T
C
O
L
D
HOT
POOL TEMP
SPA TEMP
28"
12½ in.
15½ in.
18½ in.
1
2
"B" DIM.
5
1
2
"A" DIM.
21
4.875
33 3/8 in. 22 3/8 in.
51¾ in.
Table 4.
"E" DIM.
Indoor installation - stack (USA only)
Outdoor shelter installation (Canada)
Model "A" Dim "B" Dim "C" Dim "D" Dim "E" Dim
"C"
DIM.
150
200
250
300
350
400
17 7/8 in.
20 7/8 in.
6½ in.
9½ in.
13 in.
13 in.
13 in.
13 in.
13 in.
17 in.
52¾ in.
53 7/8 in.
53 7/8 in.
55 in.
6 in.
7 in.
7 in.
8 in.
9 in.
"D"
DIM
POOL
SPA
OFF
TM
CH
HIGH PERFORMANCE HEATER
COLD
H
O
T
C
O
L
D
HOT
POOL TEMP
SPA TEMP
23 7/8 in. 12½ in.
26 7/8 in. 15½ in.
29 7/8 in. 18½ in.
33 3/8 in. 22 3/8 in.
28
7
8
13
7
8
10
56 in.
1
2
"B" DIM.
"A" DIM.
5
GAS LINE
OPENING
1
2
60¾ in.
10 in.
21
4.875
Table 5.
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation (contd.)
10
PO
OL
THERMO
STAT
SELE
CT
OF
SP
F
A
CO
LD
PO
OL
TEM
P
HO
T
CO
LD
SP
A
T
EM
P
HO
T
MANUAL BY-PASS
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.
TO
POOL
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
ISOLATION
VALVE
3
CHECK
1
VALVE
ISOLATION
VALVE
CHECK
VALVE
2
1
2
3
Optional.
FROM
POOL
Required when installation is below water level.
Required when flow rates exceed 120 gpm.
Model
150
Min.
20
Max. *
120
Figure 10.
PLUMBING CONNECTIONS
200
20
120
The MiniMax CH heater has the unique capability of
direct schedule 40 PVC plumbing connections.
250
30
120
300
30
120
350
40
120
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.
400
40
120
* Do not exceed the maximum recommended
flow rate for the connecting piping.
Table 6.
Do not operate the heater unless water in the pool/
spa is at the proper level.
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.
CAUTION
BELOW OR ABOVE POOL INSTALLATION
Check valves are recommended to prevent back
siphon.
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.
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.
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.
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
11
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.
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.
Reversing Water Connections
Disassembly
Tools needed:
1/4 in Nut Driver
Return head in position before removal.
This view shows the insulation installed by the factory.
9/16 in. Socket and Wrench
1/2 in. & 9/16 in. Open Wrench
Screw Driver(s) - (Flathead & Phillips)
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
Return head removed and new tube seals installed. Now
ready to accept the installation of the main head.
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.
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.
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.
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.
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. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation (contd.)
12
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”
3/4”
1”
1-1/4”
1-1/2”
2”
2-1/2”
NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO
MODEL
75 & 100 20’ 50’ 50’ 150’ 150’ 600’
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
150
200
250
300
350
400
525
750
900
10’ 40’ 50’ 150’ 150’ 600’
-
-
-
-
-
-
-
-
20’ 30’ 80’ 125’ 250’ 450’ 600’
10’ 20’
50’ 70’ 150’ 250’ 500’ 600’
-
-
-
-
-
-
10’ 30’ 50’ 100’ 200’ 350’ 400’ 600’
10’ 20’ 30’ 70’ 125’ 250’ 250’ 500’ 500’
-
-
-
-
10’ 20’ 60’ 100’ 150’ 200’ 450’ 400’
5’
-
15’ 35’ 65’ 150’ 130’ 360’ 390’ 700’
-
-
20’ 35’ 80’ 75’ 180’ 260’ 600’
-
15’ 20’ 50’ 45’ 80’ 150’ 360’ 400’
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
13
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 Two "Low Pressure" Gas Pipe Sizing
Stage One "High Pressure" Gas Pipe Sizing
MAXIMUM EQUIVALENT PIPE LENGTH
MAXIMUM EQUIVALENT PIPE LENGTH
Model
75 & 100
150
0 to 10 Feet
1/2 in.
10 to 20 Feet
1/2 in.
Model
75 & 100
150
0 to 50 Feet 50 to 100 Feet 100 to 150 Feet
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
1/2 in.
200
1/2 in.
3/4 in.
200
250
1/2 in.
3/4 in.
250
300
3/4 in.
3/4 in.
300
350
3/4 in.
3/4 in.
350
400
3/4 in.
3/4 in.
400
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.
PILOT
HONEYWELL
4. Connect the manometer hose to the fitting.
5. Fire the heater.
1/2 P.S.I.
PRESS
TAP
PILOT
ADJ.
Figure 11.
6. The manometer must read 4 in. WC for natural
gas, 11 in. WC for propane gas, while the heater
is operating.
MINIMAX CH GAS PRESSURE REQUIREMENTS*
Propane
7. For adjustment, remove the Regulator
Adjustment Cap and using a screwdriver turn the
screw clockwise to increase - counterclockwise
to decrease gas pressure.
Natural
Maximum inlet gas pressure 10 in. WC 14 in. WC
Minimum inlet gas pressure **5 in. WC 12 in. WC
Normal manifold pressure
** 6 WC for 400 model
*All Readings are taken with the heater fired. Any adjustments
made with heater off will give incorrect readings.
4 in. WC 11 in. WC
CAUTION
The use of Flexible Connectors (FLEX) is NOT
recommended as they cause high gas pressure drops.
Table 10.
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation (contd.)
14
VENTILATION
STACK TYPE OUTDOOR VENT KIT
Model
150
Vent Cap Product No. Vent Dia.
OUTDOOR INSTALLATION ONLY
OV15
OV20
OV25
OV30
OV35
OV40
460237
460222
460223
460224
460225
460226
6 in.
7 in.
7 in.
8 in.
9 in.
10 in.
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.
200
250
300
350
400
Table 11.
IMPORTANT!
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.
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
6"
Figure 13.
Figure 14.
6"
24"
OUTDOOR VENT CAP INSTALLATION
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.
18"
Figure 12.
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.
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.
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.
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
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
15
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
18 in.
6 in.
Front
Back
Top
Water Connection
Remaining
24 in.
6 in.
Ceiling Clearance
36 in.*
*To ceiling or roof.
Height above
any roof surface
within 10 ft.
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.
More Than10 ft.
10 ft.
horizontally
Vent Cap
3 ft. min.
Ridge
2 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
Vent Cap and
Riser Furnished
by Installer
* Rise
avoided, it is recommended that a suitable drain
pan with adequate drainage, be installed under the
heater. The pan must not restrict air flow.
Air Supply
Ventilation
Air Supply
Gas Combustion
* 1” Rise Per Foot
Recommended
Figure 16.
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation (contd.)
16
BASE FOR USE ON
COMBUSTIBLE FLOORS
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.
TM
ER
AT
HE
E
NC
MA
OR
RF
PE
GH
HI
T
M
R
E
H
T
A
T
S
O
SPA
E S
T
C
E
L
L
O
FF
O
P
O
T
HO
MP
TE
A
SP
LD
CO
T
HO
MP
TE
OL
PO
LD
CO
Air supply requirements below apply to all
MiniMax heaters
.
in
" M
6
All opening sizes are minimum and unobstructed.
SHEET
METAL
BLOCKS
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.
All Air From Inside
Figure 17.
Air for Combustion
Sq. In.
Air Ventilation
Sq. In.
Model
CAUTION
Chemicals should not be stored near the heater
installation. Combustion air can be contaminated by
corrosive chemical fumes which can void the warranty.
150
200
150
200
250
300
350
400
150
200
250
300
350
400
250
300
350
STACK TYPE INDOOR DRAFT HOOD KIT
The proper draft hood and adapter must be installed on
the heater as shown below:
400
Table 12.
Model Draft Hood Product No. Vent Dia.
150
200
250
300
350
400
DH15
DH20
DH25
DH30
DH35
DH40
460227
460228
460230
460231
460233
460234
6 in.
7 in.
7 in.
8 in.
9 in.
10 in.
All Air From Outside
Air for Combustion
Air Ventilation
Sq. In.
Model
Sq. In.
150
200
37
37
50
50
250
63
63
Table 14.
300
77
77
INDOOR DRAFT HOOD INSTALLATION
1. Take out the louvered outer top piece after first
removing the sheet metal screws, attaching it to
the cabinet.
350
90
90
400
100
100
Table 13.
Draft Hood
2. Install the adaptor
Top Cover
I
NSTALLATION ON FLOORS CONSTRUCTED
OF COMBUSTIBLE MATERIALS
(vent kit).
Adaptor
3. Install the top cover
Screw
(2 PLC's)
(vent kit).
The heater may be placed on a “combustible floor”
using either of the two methods listed below:
4. Install the draft hood
(vent kit).
Use the provided screws
a) Use a Non-combustible Base Kit for use on
combustible floors.
HEATER
to secure the vent
b) Construct a non-combustible base from masonry
blocks as illustrated, see Figure 17.
assembly.
Figure 18.
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
17
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.
PILOT
GENERATOR
TH/PP
WHT
RED
TH
PP
SAFETY
PRESS
SWITCH
GAS VALVE
WHT
HI-LIMIT
SHUT-OFF
WHT
WHT
WHT
THERMAL
CUT-OFF
ORN
WHT
WHT
POT 1
POT 2
THERMOSTAT BOARD
POOL
SPA
OFF
SENSOR
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. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
18
Troubleshooting - General
Possible Cause
Remedy
Heater will not come on
Pump not running
Place pump in operation
Check for leaks
Pump air locked
Filter dirty
Clean filter
Pump strainer clogged
Defective wiring or connection
Defective pressure switch
Defective gas controls
On-Off switch in "OFF" position
Clean strainer
Repair or replace wires
Replace switch
Call serviceperson
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
Call serviceperson
Call serviceperson
Defective flow valve or out of adjustment
Defective hi-limit and/or thermostat
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. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
19
MINIMAX CH HEATER - ALL MODELS
32
INNER TOPS
Model No. Part No.
150
200
250
300
350
400
470024
470025
470026
470027
470028
470029
31
30
28
2
1a
29
3
37
20
15
4
1
27
23
24
16
22
21
18
25
26
5
34
7
6
19
35
9
8
36
17
33
14
10
11
12
13
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
20
MiniMax CH Parts List
ITEM DESCRIPTION
QTY
150
200
250
300
350
400
1
Vent kit assy. (indoor)
1
1
1
460227 460228 460230 460231 460233 460234
460237 460222 460223 460224 460225 460226
070994 070994 070994 070994 070994 070994
1a Vent kit assy. (outdoor)
2
3
4
5
6
7
8
9
Return header
Bolt, heat exchanger
16 471991 471991 471991 471991 471991 471991
Washer 3/8" ID 1" OD
Tube seal gasket
16
18
2
072184 072184 072184 072184 072184 072184
070951 070951 070951 070951 070951 070951
470184 470184 470184 470184 470184 470184
470186 470186 470186 470186 470186 470186
472175 472174 472173 472172 472171 472170
075468 075604 075488 075605 075606 075490
070256 075525 070257 075526 075527 070258
075457 075457 075457 075457 075457 075457
075458 075458 075458 075458 075458 075458
076084 076084 076085 076085 076086 076086
075493 075496 075494 075497 075498 075495
075502 075505 075503 075506 075507 075504
Thermostat knob
Switch rocker (single pole & double throw)
Control panel assy. (complete) - Millivolt
Door - Millivolt
1
1
1
10 Manifold burner
Gas valve natural - Millivolt
Gas valve propane - Millivolt
1
1
11
1
12 Pilot tube - Millivolt
Burner tray assy. natural (complete) - Millivolt
1
1
13
Burner tray assy. propane (complete) - Millivolt
2 EA.
3 EA.
4 EA.
5 EA.
6 EA.
7 EA.
14 Burner
070230 070230 070230 070230 070230 070230
470550 470550 470550 470550 470550 470550
472125 472125 472125 472125 472125 472125
073858 075586 073857 075587 075588 073856
075459 075459 075459 075459 075459 075459
471678 471678 471678 471678 471678 471678
471750 471750 471750 471750 471750 471750
471587 471587 471587 471587 471587 471587
471441 471441 471441 471441 471441 471441
274440 274440 274440 274440 274440 274440
471993 471993 471993 471993 471993 471993
471992 471992 471992 471992 471992 471992
471419 471419 471419 471419 471419 471419
471420 471420 471420 471420 471420 471420
471694 471694 471694 471694 471694 471694
472131 472132 472133 472134 472135 472136
472169 472168 472167 472166 472165 472164
14a Burner with pilot bracket (not shown)
15 Pressure switch
1
1
1
1
2
1
1
2
2
1
1
1
1
1
1
1
16 Combustion chamber assy. (complete)
17 Presslite igniter assy.
18 Potentiometer
19 Flow valve assy.
20 Hi-Limit thermostat 115°
21 Adaptor - bulkhead, 2 in.
22 Adaptor - bulkhead ring
23 Main manifold assy.
24 Main header assy.
25 Main manifold bottom
26 Cap, main manifold bottom
27 Hi-Limit thermostat 150°
Heat exchanger (without heads)
28
Heat exchanger (with heads)
8 ea.
8 ea.
8 ea.
8 ea.
16 ea.
16 ea.
29
070277 075559 070276 075560 070277 070278
073810 073810 073810 073810 073810 073810
Baffle
30 Baffle hold down (2) baffles on 400
1
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
21
MiniMax CH Parts List, contd.
ITEM DESCRIPTION
QTY
150
200
250
300
350
400
31 Flue collector
1
1
1
1
1
1
1
073864 075622 073863 075623 075624 073862
470471 470472 470473 470474 470475 470476
075783 075784 075785 075786 075787 075788
471677 471677 471677 471677 471677 471677
073789 073789 073789 073789 073789 073789
472127 472127 472127 472127 472127 472127
472101 472101 472101 472101 472101 472101
32 Outdoor top assy.
33 Lightback shield (Propane Gas units only)
34 Electronic thermostat (Millivolt models)
35 Panel (return)
36 Panel (in/out)
37 Thermistor (probe) complete (Millivolt models)
* Not Shown
*
*
*
*
*
*
*
*
*
*
*
Plastic mounting bracket
Clips for wire harness
Wire Kit - Millivolt
Screw 8 x 1/4" HH
Screw 8 x 1/2" HH
Screw 6 x 1/4"
070715 070715 070715 070715 070715 070715
471277 471277 471277 471277 471277 471277
075511 075511 075511 075511 075511 075511
071703 071703 071703 071703 071703 071703
071698 071698 071698 071698 071698 071698
071716 071716 071716 071716 071716 071716
071659 071659 071659 071659 071659 071659
075692 075692 075692 075692 075692 075692
070551 070551 070551 070551 070551 070551
470414 470414 470414 470414 470414 470414
073725 073725 073725 073725 073725 073725
Screw 10 -32 x 1/4"
Screw 10-32 x 3/16
Bushing 1/2"
Therm knob stopper
Bolt 5/16" - 18 x 3/4'
2
2
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
Orifice main burner natural
Orifice main burner propane
Pilot - natural - Millivolt
Pilot - propane - Millivolt
Pilot - generator
073727 073727 073727 073727 073727 073727
073728 073728 073728 073728 073728 073728
471292 471292 471292 471292 471292 471292
471291 471291 471291 471291 471291 471291
071515 071515 071515 071515 071515 071515
075173 075173 075173 075173 075173 075173
470178 470178 470178 470178 470178 470178
471293 471293 471293 471293 471293 471293
471328 471328 471328 471328 471328 471328
074540 074540 074540 074540 074540 074540
471271 471271 471271 471271 471271 471271
072253 072253 072253 072253 072253 072253
071240 071240 071240 071240 071240 071240
*
*
*
*
*
*
*
*
*
*
*
*
*
1
1
1
1
1
1
1
3
Thermal cutoff - fusible link
Power element (flow-valve)
Pilot rainshield
Pilot electrode (only)
"L" brackets
Bracket adapter Q379 pilot, MV
Jumper
Door latch
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
22
NOTES
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
1
®
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
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
•
•
•
Do not try to light any appliance.
For Your
Safety
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
Download from Www.Somanuals.comA. A-1ll Manuals Search And Download.
Rev. C 1-22-04
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.
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.
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.
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.
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.
-
-
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. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off electric power to the heater.
4. This heater is equipped with an ignition device
which automatically lights the pilot. Do not try
to light the pilot by hand.
9. Replace the control access door.
10. Turn on the electrical power to the heater.
11. Set the thermostat to the desired setting.
12. If the heater will not operate, follow the instruc-
tions "To Turn Off Gas To Heater" and call your
service technician or gas supplier.
5. Remove the control access door.
6. Push in gas control knob slightly and turn clock-
wise
to “OFF”.
Gas
Inlet
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.
ON
OFF
8. Turn knob on gas control counterclockwise
to “ON”; see Figure 1.
Figure 1.
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.
4. Push in gas control knob slightly and turn
clockwise to "OFF". Do not force.
5. Replace control access door.
3. Remove control access door.
P/N 472128
A-2
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
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.
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.
WHAT TO DO IF YOU SMELL GAS
-
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 try to light matches or lighter.
Do not try to light any heater.
Do not touch any electrical switch; do not
use any phone in your building.
-
-
-
Shut off gas line at propane tank.
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. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off electric power to the heater.
4. This heater is equipped with an ignition device
which automatically lights the pilot. Do not try to
light the pilot by hand.
9. Replace the control access door.
10. Turn on the electrical power to the heater.
11. Set the thermostat to the desired setting.
12. If the heater will not operate, follow the instruc-
tions "To Turn Off Gas To Heater" and call your
service technician or gas supplier.
5. Remove the control access door.
6. Push in gas control knob slightly and turn clock-
wise
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.
Gas
Inlet
ON
8. Turn knob on gas control counterclockwise
to “ON”; see Figure 2.
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.
4. Push in gas control knob slightly and turn
clockwise to "OFF". Do not force.
5. Replace control access door.
3. Remove control access door.
Download from Www.Somanuals.comA. A-l3l Manuals Search And Download.
Rev. C 1-22-04
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.
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.
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.
Knob Stopper
Screw A
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.)
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.
NOTE
To eliminate error due to piping heat losses,
measure pool temperature with an accurate
thermometer directly at the pool or spa.
3. “Spa” position - This allows separate control of spa
water temperature.
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)
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.
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.
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.
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
A-4
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
Operation (contd.)
HEAT (HEAT)
SERVICE (SERVICE)
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 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.
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
SWITCH OR DEVICE
OPEN CIRCUIT
(BLOCK CURRENT)
SWITCH OR DEVICE
CLOSED CIRCUIT
(PASS CURRENT)
LED OFF
LED LIT
IGNITION MODULE
IND
GND
VAL
GAS VALVE
MV
TRANSFORMER
INCOMING
LINE VOLTAGE
CIRCUIT
BREAKER
HI TEMP
LIMIT SWITCHES
REMOTE
PRESS
TFUSE
MV
THERMOSTAT
RELAY
PWR
TSTAT
RMT
PRESS
HI TEMP
TFUSE
MV
HEAT
SRVE
POWER
THERM
CLOSE IF
NO MV
SERVICE
AUX
THERMOSTAT CIRCUIT BOARD
WATER AT SELECTED TEMPERATURE.... NORMAL OPERATION
PRESS
HEAT
FRONT PANEL LEDS
OR POOL/OFF/SPA THERMOSTAT SELECT SWITCH OFF.... NORMAL OPERATION
IGNITION MODULE
IND
GND
VAL
GAS VALVE
TRANSFORMER
INCOMING
LINE VOLTAGE
CIRCUIT
BREAKER
HI TEMP
LIMIT SWITCHES
REMOTE
PRESS
TFUSE
MV
MV
THERMOSTAT
RELAY
PWR
TSTAT
RMT
PRESS
HI TEMP
TFUSE
MV
HEAT
SRVE
THERM
AUX
POWER
CLOSE IF
NO MV
SERVICE
THERMOSTAT CIRCUIT BOARD
PRESS
HEAT
THERMOSTAT CALLING FOR HEAT - PUMP OFF(NO PRESSURE) BLOCKS FIRING
NORMAL OPERATION
FRONT PANEL LEDS
Download from Www.Somanuals.comA. A-5ll Manuals Search And Download.
Rev. C 1-22-04
P/N 472128
Operation (contd.)
TROUBLESHOOTING (CONTROLS) - Continued
SYMBOL TABLE
SWITCH OR DEVICE
OPEN CIRCUIT
(BLOCK CURRENT)
SWITCH OR DEVICE
CLOSED CIRCUIT
(PASS CURRENT)
LED OFF
LED LIT
IGNITION MODULE
IND
GND
VAL
GAS VALVE
MV
TRANSFORMER
INCOMING
LINE VOLTAGE
CIRCUIT
BREAKER
HI TEMP
LIMIT SWITCHES
REMOTE
PRESS
TFUSE
MV
THERMOSTAT
RELAY
RMT
PRESS
HEAT
PWR
TSTAT
HI TEMP
TFUSE
MV
SRVE
POWER
THERM
CLOSE IF
NO MV
SERVICE
AUX
THERMOSTAT CIRCUIT BOARD
HEATER FIRING - NORMAL OPERATION
PRESS
HEAT
FRONT PANEL LEDS
IGNITION MODULE
IND
GND
VAL
GAS VALVE
TRANSFORMER
INCOMING
LINE VOLTAGE
CIRCUIT
BREAKER
HI TEMP
LIMIT SWITCHES
REMOTE
PRESS
TFUSE
MV
MV
THERMOSTAT
RELAY
RMT
PWR
TSTAT
PRESS
HI TEMP
TFUSE
MV
HEAT
SRVE
THERM
AUX
POWER
CLOSE IF
NO MV
SERVICE
PRESS
HEAT
THERMOSTAT CIRCUIT BOARD
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
FRONT PANEL LEDS
P/N 472128
Rev. C 1-22-04
A-6
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation
Regulator Adjustment Cap
REGULATED MANIFOLD PRESSURE TEST
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.
PRESS
TAP
PILOT
ADJ.
Transformer Wiring Instruction
ELECTRICAL, IID ELECTRONIC UNITS
Electrical Rating
60 Hz
115 V.A.C. or 230 V.A.C.
50/60 Hz 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.
Download from Www.Somanuals.comA. A-7ll Manuals Search And Download.
Rev. C 1-22-04
P/N 472128
Installation (contd.)
MiniMax CH (150 IID Model) Electronic Ignition Wiring Diagram
PLUG
PLUG
4
3
2
1
3
2
1
6
T F U S E
H L M T
5
4
3
2
1
2
P R E S S
1
A-8
P/N 472128
Rev. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
Installation (contd.)
REMOTE SWITCH DUAL THERM IID ONLY
JUMPER REQUIRED IF NO 2 WIRE REMOTE SWITCH
3 Wire Remote
24 VAC
PRESS HILMT TFUSE
VALVE
IGNITION MOD
OUT
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
24 VAC PRESS HILMT TFUSE
RETURN
VALVE
IGNITION MOD
OUT
THERMOSTAT CIRCUIT BOARD
SPA COM POOL
TPROBE
Figure 8.
FRONT PANEL
POOL/OFF/SPA
THERMOSTAT SELECT SWITCH
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..
Download from Www.Somanuals.comA. A-9ll Manuals Search And Download.
Rev. C 1-22-04
P/N 472128
MINIMAX CH HEATER - 150 IID MODEL
32
INNER TOP
Model No. Part No.
150
470024
31
30
28
2
1a
29
3
37
20
15
4
1
27
23
24
16
22
21
25
26
6
5
7
19
18
34
35
9
8
36
37
33
14
10
11
12
13
38
17
P/N 472128
Download from Www.SomanuaAls.-c1o0m. All Manuals Search And Download.
Rev. C 1-22-04
MiniMax CH Parts List - 150 IID Model
ITEM DESCRIPTION
QTY
1
150
1
1a
2
Vent kit assy. (indoor)
460227
460237
070994
471991
072184
070951
470179
470186
472151
472191
075468
070256
073998
073999
075191
073752
073906
2 EA.
Vent kit assy. (outdoor)
1
Return header
1
3
Bolt, heat exchanger
16
16
18
1
4
Washer 3/8" ID 1" OD
5
Tube seal gasket
6
Electronic Thermostat circuit board - IID Model
Switch rocker (single pole & double throw)
Control panel assy. (complete) - IID Natural
Control panel assy. (complete) - IID Propane
Door - Millivolt or IID
7
1
1
8
1
9
1
10
Manifold burner
1
Gas valve Natural - IID
1
11
12
13
Gas valve Propane - IID
1
Pilot tube - IID
Burner tray assy. Natural (complete) - IID
Burner tray assy. Propane (complete) - IID
1
1
14
Burner
070230
470550
472125
073858
471360
470184
471750
471587
471441
274440
471993
471992
471419
471420
471694
472131
472169
8 ea.
14a Burner with pilot bracket (not shown)
1
1
1
1
2
1
1
2
2
1
1
1
1
1
1
1
15
16
17
18
19
20
21
22
23
24
25
26
27
Pressure switch
Combustion chamber assy. (complete)
Transformer - w/circuit breaker - dual voltage
Thermostat knob
Flow valve assy.
Hi-Limit thermostat 115°
Adaptor - bulkhead, 2 in.
Adaptor - bulkhead ring
Main manifold assy.
Main header assy.
Main manifold bottom
Cap, main manifold bottom
Hi-Limit thermostat 150°
Heat exchanger (without heads)
Heat exchanger (with heads)
28
29
30
070277
073810
Baffle
Baffle hold down (2) baffles on 400
1
A-11
Rev. C 1-22-04
P/N 472128
Download from Www.Somanuals.com. All Manuals Search And Download.
MiniMax CH Parts List - 150 IID Model, contd.
ITEM DESCRIPTION
QTY
1
150
31
32
33
Flue collector
073864
470471
075783
073584
073585
073789
472127
471566
470122
Outdoor top assy.
1
Lightback shield (Propane Gas units only)
Module Natural Gas
Module Propane Gas
Panel (return)
1
1
34
1
35
36
37
38
1
Panel (in/out)
1
Thermistor (probe) complete - IID
Junction Box
1
1
* Not Shown
*
*
*
*
*
*
*
*
*
*
*
Plastic mounting bracket
Clips for wire harness
Wire Kit - Millivolt
Screw 8 x 1/4" HH
Screw 8 x 1/2" HH
Screw 6 x 1/4"
070715
471277
075511
071703
071698
071716
071659
075692
070551
470414
073725
Screw 10 -32 x 1/4"
Screw 10-32 x 3/16
Bushing 1/2"
Therm knob stopper
Bolt 5/16" - 18 x 3/4'
2
2
3 ea.
N or P
Orifice main burner natural
Orifice main burner propane
Pilot - natural - Millivolt
Pilot - propane - Millivolt
Pilot - generator
073727
073728
471292
471291
071515
075173
470178
471293
471328
074540
471271
072253
071240
*
*
*
*
*
*
*
*
*
*
*
*
*
1
1
1
1
1
1
1
3
Thermal cutoff - fusible link
Power element (flow-valve)
Pilot rainshield
Pilot electrode (only)
"L" brackets
Bracket adapter Q379 pilot, MV
Jumper
Door latch
P/N 472128
Rev. C 1-22-04
A-12
Download from Www.Somanuals.com. All Manuals Search And Download.
NOTES
Rev. C 1-22-04
P/N 472128
A-13
Download from Www.Somanuals.com. All Manuals Search And Download.
SAVE THESE INSTRUCTIONS.
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. C 1-22-04
Download from Www.Somanuals.com. All Manuals Search And Download.
|