Pentair Minimax 250 Users Manual 471593_revC.p65

300 to the manual 5ef28daf-95c0-4fa4-8540-7b9e6d9a6303

2015-02-06

: Pentair Pentair-Minimax-250-Users-Manual-517977 pentair-minimax-250-users-manual-517977 pentair pdf

Open the PDF directly: View PDF PDF.
Page Count: 40

Rev. C 11-1-01 P/N 471593
1
1
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.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or other appliances.
For Your
Safety
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.
MiniMax® NT Low NOx Series
POOL & SPA HEATERS
OPERATION & INSTALLATION MANUAL
WARNING
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
WARNING
U.S. Patent Numbers
5,318,007 - 5,228,618
5,201,307 - 4,595,825
Pentair Pool Products, Inc.
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 W. Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400
1
To
Consumer
Retain For
Future
Reference
P/N 471593 Rev. C 11-1-01
2
Table of Contents
Introduction ............................................................................................................... 3
Important Notices ...................................................................................................................................................................... 3
Code Requirements ................................................................................................................................................................... 3
Warranty Information ................................................................................................................................................................. 4
Operation .................................................................................................................... 4
Safety Rules .............................................................................................................................................................................. 4
HSI (Hot-Surface Ignition) Lighting/Operation - Natural Gas ..................................................................................................... 5
Installation Instructions—Specifications................................................................. 6
Installation — Electrical ............................................................................................................................................................. 7
Installation — Remotes (2 and 3 Wire) ...................................................................................................................................... 8 - 9
Installation — Wiring Diagram ................................................................................................................................................... 10 - 12
Installation — Water Connections.............................................................................................................................................. 13
Installation — Plumbing ............................................................................................................................................................. 13
Installation — Gas Line ............................................................................................................................................................. 14
Pipe Sizing Chart/Gas Pressure Requirements ......................................................................................................................... 14
Regulated Manifold Pressure Test ............................................................................................................................................. 14
Venting — Indoor Installations ................................................................................................................................................... 15 - 18
Venting — Outdoor Installations ................................................................................................................................................ 19
Basic Operation — General Description .................................................................................................................................... 20
Basic Operation — Safety Controls ...........................................................................................................................................21 - 22
Basic Operation — HSI Ignition Module .................................................................................................................................... 22
Thermostat (Programming & Layout) ........................................................................................................................................ 23
Temperature & Time Setting (Programming) .............................................................................................................................24 - 25
Maintenance ............................................................................................................................ 26
Maintenance Instructions ........................................................................................................................................................... 26
Pressure Relief Valve ................................................................................................................................................................ 26
Maintenance (Water Treatment) ................................................................................................................................................ 27
Trouble Shooting ....................................................................................................... 28
Normal Operation Sequence ..................................................................................................................................................... 28 - 29
Troubleshooting & Service ......................................................................................................................................................... 30 - 31
Troubleshooting (General) ......................................................................................................................................................... 32
MiniMax NT Low NOx Parts List & Exploded View (Single Voltage) ......................................... 33-34
MiniMax NT Low NOx Parts List & Exploded View (Dual Voltage) ............................................ 35-36
Warranty Information ................................................................................................. Back Cover
Rev. C 11-1-01 P/N 471593
3
MiniMax NT Low NOx
Pool and Spa Heaters
Congratulations on your purchase of a MiniMax NT Low NOx 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 NT Low NOx is a compact, lightweight, efficient, induced-draft,
gas fired high performance pool and spa heater that can be directly connected to schedule 40 PVC pipe. The
MiniMax NT Low NOx, also comes equipped with the Pentair multifunction temperature controller 7800
which shows, at a glance, the proper functioning of the heater. All HSI (hot-surface ignition) MiniMax NT
Low NOx heaters are designed with a direct ignition device (HSI) which eliminates the need for a standing
pilot. The MiniMax NT Low NOx requires an external power source (120/240 VAC 50/60 Hz) to operate.
IMPORTANT NOTICES
...For the installer and operator of the MiniMax NT Low NOx 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.
Do not use the heater to protect pools or spas from freezing if the final maintenance temperature desired is
below 60° 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.
Introduction
P/N 471593 Rev. C 11-1-01
4
Operation
This instruction manual provides operating
instructions, installation and service information
for the MiniMax NT Low NOx high performance
heater. The information in this manual applies to
the MiniMax NT Low NOx 200, 250, 300, and
400 natural gas 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 NT Low NOx.
History and experience has shown that most heater
damage is caused by improper installation practices.
SAFETY RULES
1. Spa or hot tub water temperatures should never
exceed 104° F. A temperature of 100° F. 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 100° F. 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.
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.
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.
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.
WARNING
WARRANTY INFORMATION
The MiniMax NT Low NOx 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
Rev. C 11-1-01 P/N 471593
5
Operation (Lighting)
FOR YOUR SAFETY: READ BEFORE LIGHTING
A. This heater is equipped with an ignition device
which automatically lights the main burners.
Do not try to light the burners 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.
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 NT Low NOx incorporates the
Pentair temperature controller 7800 to aid you
in the operation of the heater, and to assist in
diagnosing a failure in the heater’s function.
MINIMAX NT LOW NOx HSI ELECTRONIC IGNITION LIGHTING/OPERATION -
NATURAL GAS
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 main burners. Do
not try to light the burners by hand.
5. Remove the control access door.
6. Push in gas control knob slightly and turn clock-
wise to “OFF”. (If not on “OFF” position.)
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.
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.
WARNING
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.
OPERATING INSTRUCTIONS
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.
4. Push in gas control knob slightly and turn
clockwise to "OFF". Do not force.
5. Replace control access door.
Gas control knob shown in “ON” position.
Figure 1.
OFF
ON
Gas
Inlet
P/N 471593 Rev. C 11-1-01
6
Installation Instructions
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.
SPECIFICATIONS
24.05
2 in. SOCKET
"A" DIM.
8.84
6.64
30.63
LEG
LEG
14.50
3.50
4.875
MODEL
200
250 24.63
21.63
"A" DIM.
15.50
300
400 34.13
27.63
7.35
24.05
"A" DIM.
8.84
6.64
30.63
LEG
LEG
14.50
3.50
4.875
INDOOR VENT ADAPTOR
4 in. Kit
P/N 460506
5 in. Kit
P/N 460507
15.50
7.35
Ø4.88
Ø5.88
4 in. Kit
P/N 460506
2.00
5 in. Kit
P/N 460507
MODEL
200
250 24.63
21.63
"A" DIM.
300
400 34.13
27.63
OUTDOOR VENTILATION
INDOOR VENTILATION
Figure 2.
Figure 3.
Rev. C 11-1-01 P/N 471593
7
Installation (Electrical)
ELECTRICAL, ALL HSI UNITS
Electrical Rating 50/60 Hz 120 V.A.C. ONLY
NOTE
The transformer is pre-wired at the factory for 120 VAC operation ,connect line
supply to the line terminal block inside junction box. Use caution in con-
necting supply to proper Line (L), Neutral (N), and Ground (GND) terminals;
see below, Figure 5.
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.
L
N
GREEN WIRE
WHITE WIRE
BLACK WIRE
GROUND
CONNECTION
NEUTRAL / WHITE 120 VAC
POSITIVE LINE FOR 120 VOLTS AC
INTERNAL
FACTORY WIRES
LINE TERMINAL BLOCK
Figure 5.
P/N 471593 Rev. C 11-1-01
8
TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP
Installation (Remotes)
Before connecting the remote control system please read the following:
1. First turn the gas valve to the "OFF" position and power up the
heater, now using the front buttons on the temperature controller,
set the "SPA" and "POOL" temperature to the maximum setting,
see Page 24.
2. Now turn the heater to the "OFF" mode by using the "OFF" button
on the temperature controller, see Page 24 or by using the main
power switch located on the bottom of the junction box.
3. With the heater in the "OFF" mode, locate the three tabs on the back
of the temperature controller as viewed from the backside,
see Figure 6.
4. • Two-wire remote with temperature control:
a) Using 3/16" female quick disconnect connectors, connect one
wire to the "GND" tab of the temperature controller, then the
second wire to either the "SPA" or "POOL" tab.
b) Now return power to the heater but leaving the temperature controller in the "OFF" position,
see Page 24. (Note: If you used the main power switch to turn off the heater, now turn the main power
switch on.) At this time the remote system has control over the heater, and will turn it on and off when
called for by the remote system thermostat thus keep the pool and spa at the desired temperature.
123
POOL SPA GND
Figure 6.
10 A
25O V
RELAY
5 A
25O V
RELAY
10 A
25O V
RELAY
TPROBE
AUX2
POWERLIMITSG VALVEIGN MODULE
24 VAC
PV
PV/MV
MV
PV/MV
PV
MV
24 VAC
H LIMIT
T FUSE
PRESS
BLOWER
A.C LOAD (PUMP/AUX2)
(PILOT DUTY ONLY)
3
4
1234 123 123456 12 12
1
2
3
1
F
2
TEMPERATURE
DISPLAY MODE
3
C
5 A FUSE
FOR AUX2 (PILOT DUTY ONLY)
2
13
(AUX1)
REMOTE
AIR PRESS
POOL
SPA
GND
BLOWER (POWER) LINE
BLOWER (POWER) LINE
PUMP/AUX2
PURGE PUMP
MODE
135
642
531
246
J1 J2
}
NOT USED
SPA
GND
REMOTE SWITCH CONTROLLER
2 WIRE REMOTE
Figure 7.
Three-Wire continued on next page.
Rev. C 11-1-01 P/N 471593
9
• Three-wire remote:
a) Using 3/16" female quick disconnect connectors, connect the common wire to the "GND" tab of the
temperature controller, then connect the two remaining wires to the temperature controller
corresponding to the remote control device, pool wire to "POOL" tab, spa wire to "SPA" tab.
b) Now return power to the heater. (Note: If you used the main power switch to turn off the heater, now
turn the main power switch on.) At this time, the remote system has control over the heater and if pool
or spa temperature is below the temperature controller setting, then the heater will try to come on.
c) If you desire to reset the temperature settings of the temperature controller, the remote has to be in the
desired mode for you to change the particular setting. Example: You wish to raise or lower the pool
temperature from the factory setting, you must have the remote system in the pool mode, if you wish to
change the spa temperature, you must have the remote system in the spa mode.
5. Now turn on the gas valve to "OPEN" position, the heater is now ready to
operate.
NOTE
The heater factory settings are 78° F. for the pool and 104° F. for the spa.
When connecting a remote control to the MiniMax, 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. A Remote hook-up deactivates the selector keys on the front
thermostat display panel and gives selection control to the remote.
TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP, (cont’d.)
Installation (Remotes)
10 A
25O V
RELAY
5 A
25O V
RELAY
10 A
25O V
RELAY
TPROBE
AUX2
POWERLIMITSG VALVEIGN MODULE
24 VAC
PV
PV/MV
MV
PV/MV
PV
MV
24 VAC
H LIMIT
T FUSE
PRESS
BLOWER
A.C LOAD (PUMP/AUX2)
(PILOT DUTY ONLY)
3
4
1234 123 123456 12 12
1
2
3
1
F
2
TEMPERATURE
DISPLAY MODE
POOL
3
C
5 A FUSE
FOR AUX2 (PILOT DUTY ONLY)
2
13
(AUX1)
REMOTE
AIR PRESS
POOL
SPA
GND
POOL
SPA
GND
BLOWER (POWER) LINE
BLOWER (POWER) LINE
PUMP/AUX2
PURGE PUMP
MODE
135
642
531
246
J1 J2
REMOTE POOL/OFF/SPA
THERMOSTAT SELECT SWITCH
}NOT USED
COMMON
SPA
3 WIRE REMOTE
This icon is not a fault icon
but instead indicates a remote
switching device is connected
to the Pentair Temperature
Controller 7800, and has
overriding selection control
of Pentair Temperature
Controller 7800.
Figure 8.
P/N 471593 Rev. C 11-1-01
10
Installation (Single Voltage Wiring)
MiniMax NT Low NOx 400 HSI Electronic Ignition Wiring Diagram
(SINGLE VOLTAGE)
GRN
IGN MODULE
IGNITOR
HOT SURFACE
BURNER
LOW GAS PRES.
SWITCH
GRN
VAL
TH
S2
L2
L1
S1
MiniMax NT 400 LOW NOx WIRING DIAGRAM
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.
SHEET METAL
GROUND SCREW WITH PAINT CUTTING WASHER
TERMINATE SUPPLY SAFETY GROUND WIRE (GREEN) HERE
CHASSIS
BOND LUG
EXTERNAL
ORG
WHT
GRN
2
1
3
2
1
4
3
2
5
1
4
3
6
2
1
W2
W1
F2
F1
P11P10P7P4
ORG
RED
THERMAL FUSE
WHT
BLU
RED
SWITCH
WATER PRESSURE
THERMAL SWITCHES
EXHAUST HIGH LIMIT
NEU
HOT
GAS VALVE
BLU
WHT
RED
432112312345612
10A
250V
RELAY
RELAY
250V
10A
5A
250V
RELAY
LIMITS G VALVE IGN MODULEPOWERTPROBE
REMOTE
AUX2
123
FC
BLOWER
2
1
3
1
2
TEMPERATURE
PROBE
RED
HIGH LIMIT
THERMAL SWITCHES
120 VAC
FROM
(ONLY)
FROM
COM
SPA
POOL
1
2
3
4
5
3
2
1
BTERM
GRN
NEU
HOT (ONLY)
SUPPLY 120 VAC
AIR PR SW.
SWITCH
LOW AIR PRES.
SWITCH
HI AIR PRES.
HI SPEED
LOW SPEED
COM
DUAL
SPEED
FAN
HOT SURFACE
IGNITOR
(NEU)
(HOT)
FC
FL
FH
PC
PL
PH
24VAC
RET
FAN CON. BOARD
ORG
BLU
RED
WHT
BLOCK A
TERM
BLOCK
TERM
BLOCK
TERM
BLOCK
B
B
WHT
BLK
WHT
BLK
BLK
WHT
WHT
ORG
ORG
ORG
ORG
WHT
ORG
ORG
ORG BLK
BLK
WHT
RED
BLK
ORG
ORG
ORG
BLK
(HOT)
N
WHT
WHT
WHT
WHT
RED
Rev. C 11-1-01 P/N 471593
11
Installation (Single Voltage Wiring)
MiniMax NT Low NOx 250 HSI Electronic Ignition Wiring Diagram
(SINGLE VOLTAGE)
GRN
IGN MODULE
IGNITOR
HOT SURFACE
BURNER
LOW GAS PRES.
SWITCH
GRN
VAL
TH
S2
L2
L1
S1
MiniMax NT 250 LOW NOx WIRING DIAGRAM
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.
SHEET METAL
GROUND SCREW WITH PAINT CUTTING WASHER
TERMINATE SUPPLY SAFETY GROUND WIRE (GREEN) HERE
CHASSIS
BOND LUG
EXTERNAL
ORG
WHT
GRN
2
1
3
2
1
4
3
2
5
1
4
3
6
2
1
W2
W1
F2
F1
P11
PI0
P7
P4
ORG
RED
THERMAL FUSE
WHT
BLU
RED
SWITCH
WATER PRESSURE
THERMAL SWITCHES
EXHAUST HIGH LIMIT
NEU
HOT
GAS VALVE
BLU
WHT
RED
432112312345612
10A
250V
RELAY
RELAY
250V
10A
5A
250V
RELAY
LIMITS G VALVE IGN MODULE
POWERTPROBEREMOTE
AUX2
123
FC
BLOWER
2
1
3
1
2
TEMPERATURE
PROBE
RED
HIGH LIMIT
THERMAL SWITCHES
120 VAC
FROM
(ONLY)
TERM
FROM
B
COM
SPA
POOL
1
2
3
4
5
3
2
1GRN
NEU
HOT (ONLY)
SUPPLY 120 VAC
AIR PR SW.
SWITCH
HI AIR PRES.
FAN
ORG
BLU
RED
WHT
BLOCK
BLOCK
TERM B
BLOCK
TERM BBLOCK
TERM A
(NEU)
(HOT)
BLK
BLK
WHT
WHT
BLK
WHT
BLK
WHT
ORG
ORG
ORG
RED
RED
WHT
WHT
WHT
WHT
WHTBLK
BLK
BLK
WHT
N
(HOT)
P/N 471593 Rev. C 11-1-01
12
Installation (Dual Voltage Wiring)
MiniMax NT Low NOx (ALL MODELS) HSI Electronic Ignition Wiring Diagram
(DUAL VOLTAGE)
GRN
IGN MODULE
IGNITOR
HOT SURFACE
BURNER
GND
MV1
TH
S2
L2
L1
S1/240
MiniMax NT LOW NOx ALL MODELS WIRING DIAGRAM
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, 200˚ C TEMPERATURE RATING.
INTERCONNECTING WIRING TO APPLIANCE MUST CONFORM TO THE NATIONAL ELECTRICAL
CODE OR SUPERCEDING LOCAL (WIRING) CODES.
SHEET METAL
GROUND SCREW WITH PAINT CUTTING WASHER
TERMINATE SUPPLY SAFETY GROUND WIRE (GREEN) HERE
CHASSIS
BOND LUG
EXTERNAL
ORG
WHT
GRN
2
1
3
2
1
4
3
2
5
1
4
3
6
2
1
F2
F1
P11
P10
P7
P4
ORG
RED
THERMAL FUSE
WHT
BLU
RED
SWITCH
WATER PRESSURE
THERMAL SWITCHES
EXHAUST HIGH LIMIT
GAS VALVE
BLU
WHT
RED
432112312345612
10A
250V
RELAY
RELAY
250V
10A
5A
250V
RELAY
LIMITS VALVE MODULEPOWERTPROBE
REMOTE
AUX2
12
3
FC
BLOWER
2
1
3
1
2
TEMPERATURE
PROBE
RED
HIGH LIMIT
THERMAL SWITCHES
COM
SPA
POOL
1
2
3
4
5
3
2
1
GRN
AIR
GAS PRESSURE SW.
ORG
BLU
RED
WHT
BLOCK
TERM BBLOCK
TERM A
WHT
WHT
BLK
WHT
BLK
WHT
ORG
RED
RED
WHT
WHT
WHT
WHT
WHT
BLOWER
BLK/WHT
BLK
RED/WHT
RED
PUR
ORG
WHT
BLK
FOR 120 VAC
FOR 240 VAC
YEL
BLU
WHT
S1/120
LO/FS
WHT
BLK
120 VAC
OR
240 VAC
BLK
WHT
BLK
BLK
YEL
CON-2F
CON-2F
CON-2M
AIR PRESSURE SW.
ORG
WHT
RELAY
PRESS SW.
TFUSE GAS IGN
PUMP RELAY
GRN
WHT
WHT
(WHT)
WHT
BLK
(BRN)
GRN
(BLU)
Rev. C 11-1-01 P/N 471593
13
PLUMBING CONNECTIONS
The MiniMax NT Low NOx heater has the unique
capability of direct schedule 40 PVC plumbing
connections. A set of bulkhead fittings is included with
the MiniMax NT Low NOx to insure conformity with
Pentair’s recommended PVC plumbing procedure.
Other plumbing connections can be used.
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.
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.
WATER CONNECTIONS
Reversible Inlet/Outlet Connection
The MiniMax NT Low NOx 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
Tools required:
1/4 in. Screw Driver
9/16 in. Socket and Wrench
1/2 in. & 9/16 in. Open Wrench
1. Remove the right and left large inspection plates.
2. Disconnect all wires from the high-limit
switches except the short jumper wire.
3. Disconnect the pressure switch wiring.
4. Remove the temperature sensing bulb from the
inlet/outlet header. Note: If needed, you may cut
the wire ties holding them together.
5. Remove the 16 bolts holding the main inlet/
outlet head and return head in place, exchange
the heads, using the new tube seals supplied
with the heater, re-install the 16 bolts using
moderate torque.
6. Install the temperature sensing probe 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 and the
pressure switch wiring, routing the wires
through the same hole as the thermostat sensor
wires.
8. Re-install the two large inspection plates on the
appropriate side.
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.
ledoM)MPG(.niM*)MPG(.xaM
00202021
05203021
00303021
00404021
dednemmocermumixamehtdeecxetonoD*
.gnipipgnitcennocehtrofetarwolf
Installation (Plumbing)
BELOW POOL INSTALLATION
If the heater is below water level, the pressure
switch must be adjusted. This adjustment must be
done by a qualified service technician. See Page 22,
Figure 20.
PUMP
FILTER
POOL
HEATER
CHECK
VALVE
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
CHECK
VALVE
FROM
POOL
Figure 9.
P/N 471593 Rev. C 11-1-01
14
Installation (Gas Line)
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. Table 1, 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.
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.
Pipe Sized For Length Of Run In Equivalent Feet
ledoM
002
052
003
004
.ni2/1.ni4/3.ni1.ni¼1.ni½1.ni2
taNPLtaNPLtaNPLtaNPLtaNPLtaNPL
-'02'03'08'521'052'054'006 ----
-'01'02'05'07'051'052'005'006 ---
-- '01'03'05'001'002'053'004'006--
--- '01'02'06'001'051'002'054'004-
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. Turn on the heater.
6. The manometer must read 4 in. WC for natural gas,
while operating.
7. For adjustment, remove the Regulator Adjustment
Cap and using a screwdriver turn the screw clock-
wise to increase - counterclockwise to decrease gas
pressure.
Table 1.
Natural
Maximum inlet gas pressure 10 in. WC
Minimum inlet gas pressure **5 in. WC
Normal manifold pressure 4 in. WC
*All Readings are taken with the heater fired. Any adjustments
or readings made with heater off will give incorrect readings.
** 6 WC for 400 model
OFF
ON
Regulator Adjustment Cap
1/8" NPT Plug
(Manifold Press)
1/8" NPT Plug
(Inlet Press)
Figure 10.
CAUTION
The use of Flexible Connectors (FLEX) is NOT
recommended as they cause high gas pressure drops.
MINIMAX NT LOW NOx GAS PRESSURE REQUIREMENTS*
WARNING
Do not install the gas line union inside the heater
cabinet. This will void your warranty.
Rev. C 11-1-01 P/N 471593
15
INDOOR VENTING—General Requirements
The vent pipe must be the same size or larger. The MiniMax NT Low NOx heaters are capable of a 360-degree
discharge rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400°
F. The total length of the horizontal run must not exceed the length that is listed below in the tables.
Please note the allowable vent runs for each stack pipe diameter are different and can not be exceeded.
Note that each 90-degree elbow reduces the maximum horizontal vent run by 8 feet and each 45-degree elbow
in the vent run reduces the maximum vent run by 4 feet. See the tables below for the maximum vent lengths
using a 90-degree and 45-degree elbows. The MiniMax NT Low NOx induced-draft pool and spa heater uses
positive pressure to push flue gases through the vent pipe to the outside. This requires a completely sealed vent
system—single wall vent pipe with sealed-seams and joints may be used. Flue gases under positive pressure
may escape into the dwelling with any cracks or loose joints in the vent pipe, or improper vent installation.
The vent pipe must be of a sealed-seam construction such as those listed for use with category III appliances.
Alternately, single wall or double-wall type B duct which has had duct seams and joints permanently sealed
using cements or other suitable means which are rated for use at the flue gas temperatures of 325° F. and are
permanent are acceptable. The use of listed thimbles, roof jacks and/or side vent terminals are required; and the
proper clearances to combustible materials must be maintained in accordance with type of vent pipe employed—
in the absence of a clearance recommendation by the vent pipe manufacturer, the requirements of the Uniform
Mechanical Code should be met. The ventilation air requirements for the MiniMax NT Low NOx heater and
can be found on page 17. It is recommended that vent runs over 18 feet be insulated to reduce condensation
related problems and/or the use of a condensate trap in the vent run close to the heater may be necessary in
certain installations such as cold climates. The MiniMax NT Low NOx is suitable for through-the-wall venting.
Recommended sources for Side-wall vent hood terminals include: The Field Controls Co. (2308 Airport Road,
Kingston, NC 28501, (800)742-8368) and Tjernlund Products Inc. (1601 Ninth Street, White Bear Lake, MN
55110, (800) 255-4208)—consult manufacturer for model information and availability.
CAUTION
Do NOT combine exhaust vent pipes to a common exhaust vent in multiple unit installations. Run separate vent pipes.
).tf.viuqE(tnev.D.O.ni5,nuRtneVmumixaM.tf54
swoble°09lanoitiddA
wobletsrifretfa
swoble°54lanoitiddA
wobletsrifretfa
ytitnauQ.xaMdecudeRytitnauQ.xaMdecudeR
)latot2(173)latot2(14
)latot3(292)latot3(73
)latot4(312)latot4(33
).tf.viuqE(tnev.D.O.ni4,nuRtneVmumixaM.tf22
swoble°09lanoitiddA
wobletsrifretfa
swoble°54lanoitiddA
wobletsrifretfa
ytitnauQ.xaMdecudeRytitnauQ.xaMdecudeR
)latot2(1.tf41)latot2(.tf81
)latot3(2—)latot3(.tf41
)latot4(3—)latot4(—
Installation (Indoor)
P/N 471593 Rev. C 11-1-01
16
INDOOR INSTALLATION (USA ONLY)
OUTDOOR SHELTER INSTALLATION (CANADA)
See page 17 for (Indoor) Vent Adaptors
All products of combustion and vent gases must be
completely removed to the outside atmosphere through
a vent pipe which is connected to the stack adaptor. A
vent pipe extension of the same size must be connected
to the indoor stack adaptor 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 11 and 12. 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 heater must be located as close as practical to a
chimney or gas vent.
CAUTION
The heater should be installed at least 5 feet away
from the pool or spa.
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.
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
Water Connection 18 in. 24 in. - -
Remaining 6 in. - 6 in. -
Ceiling Clearance - - - 18 in.*
*To ceiling or roof.
Vent
Cap
Ridge
Chimney
3 ft. min.
2 ft. min.
10 ft.
Roof
Jack
AIR SUPPLY
VENTILATION
AIR SUPPLY
GAS COMBUSTION
OPTIONAL SIDE WALL VENT NT
VENT CAP AND
RISER FURNISHED
BY INSTALLER
Installation (Indoor)
The heater should not be installed closer than 6 inches to
any fences, walls or shrubs at any side or back, nor
closer than 18 inches at the plumbing side. A minimum
clearance of 24 inches must be maintained at the front of
the heater.
DOOR
6"
6"
24"
18"
Figure 13.
Figure 11.
Figure 12.
Rev. C 11-1-01 P/N 471593
17
.oNtcudorP.aiDtneV
605064.ni4
705064.ni5
Figure 15.
YLPPUSRIADERIUQER
ledoM
noitsubmoCrofriA
.nI.qS
noitalitneVriA
.nI.qS
002002002
052052052
003003003
004004004
ledoMtiKesaBelbitsubmoC-noN
002169174
052905064
003069174
004805064
Installation (Indoor)
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 Table 2.
Air supply requirements below apply to all
MiniMax NT Low NOx heaters*.
CAUTION
Chemicals should not be stored near the heater
installation. Combustion air can be contaminated by
corrosive chemical fumes which can void the warranty.
*NOTE
The openings listed in Table 2 are free open vent
area—if the vents incorporate restrictive louvers,
the vent openings must be increased to
compensate for the area blocked by the louvers (or
grills).
b) Construct a non-combustible base from masonry
blocks as illustrated, see Figure 14.
I
NSTALLATION 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.
INDOOR VENT ADAPTORS
(FITS ALL MODELS)
The proper draft hood and adapter must be installed on
the heater as shown below and on pages 15 and 16:
Figure 14.
Indoor Vent
Adaptor
Table 2.
P/N 471593 Rev. C 11-1-01
18
Detail H
INDOOR INSTALLATIONS
MINIMAX NT LOW NOx VENTING GUIDELINES
vent terminated at
least 24" above
any object within 10 ft.
Vent
Cap
Ridge
Chimney
3 ft. min.
2 ft. min.
10 ft.
4'
7'
4'
Air Supply
Ventilation
Air Supply
Combustion
Vent Hood
Walkway
3'
1' min.
1' min.
1' min.
above grade
Vent Hood
Vent Hood
E
H
D
F
G
G
F
BC
A
must extend at least 3 ft. higher than the
point at which it passes through the roof,
or as permitted by local code.
must use a double-wall vent pipe through
the roof penetration.
must terminate with an approved (listed)
roof jack, storm collar, and vent/weather cap.
must be not less than 7 ft. above public walkways.
must be at least 3 ft. above any outside air intake located within a 10 ft. radius.
must NOT be within 3 ft. of an inside corner of the structure.
must be at least 1 ft. above grade.
must be located the following distances away from any door, window, or gravity air inlet:
4 ft. below
4 ft. horizontally
1 ft. above
Air Supply
See Air Supply Requirements Table.
B
A
D
E
F
J
K
L
C
G
Vent termination for side wall installations:
must be the same diameter as the
vent connector.
must be suitable for use with category III
appliances which have flue gas temperatures
of less than 400 deg. F.
may use a single wall vent pipe with
permanently sealed seams and joints.
Vent pipe extension:
Vent for roof penetration installations:
L
J
K
Recommended sources for
side wall Vent Hood; see page 15,
Section Venting.
(Table 2 on page 17.)
Figure 16.
Installation (Indoor)
Rev. C 11-1-01 P/N 471593
19
VENTILATION
OUTDOOR INSTALLATION ONLY (Outdoor Shelter Installation in Canada, see page 16)
For outdoor installation with built in vent, 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.
Maintain minimum clearances as indicated below. Install a minimum of 4 feet below, and 4 feet horizontally from any
opening to a building, see Figure 17.
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.
NOTE
This unit shall not be operated outdoors at temperatures below -20o F. for natural gas.
Installation (Outdoor)
MINIMAX NT VENTING GUIDELINES
OUTDOOR INSTALLATION
B
C
D
Must be not less than 7 ft. above public walkways.
Must be at least 3 ft. above any forced
air inlet located within a 10 ft. radius.
A
B
C
D
E
Vent Termination:
Check local building codes
for setback requirements.
Property Line
4'
1'
4'
4'
Walkway
3'
A
Must be located the following distances away
from any door, window, or gravity air inlet:
4 ft. below, or
4 ft. horizontally, or
1 ft. above
E
Figure 17.
P/N 471593 Rev. C 11-1-01
20
GENERAL DESCRIPTION
The MiniMax NT Low NOx Pool and Spa Heater is a fan-assisted induced draft appliance. The MiniMax
NT Low NOx is available in 200,000, 250,000, 300,000 and 400,000 btu/hr. capacities and are certified for
both indoor and outdoor installations. The MiniMax NT Low NOx version natural gas pool heater must be
used for installations in the South Coast Air Quality Management District (SCAQMD)—these heaters are
certified to comply with SCAQMD Rule 1146.2 and also meet Ventura Co. APCD Rule 74.11.1.
The MiniMax NT Low NOx is designed to operate both in stackless outdoor installations and in indoor
stack vent installations—the indoor installation may be made using Kit 460506 or 460507; see pages 6 and
17, vertical vent pipe or with a horizontal vent pipe and a Listed side-wall vent.
BASIC SYSTEM OPERATION
TO OPERATE HEATER
1. Start pump, make sure the pump is running and is primed, to close water pressure switch and
supply power to heater.
2. Set thermostat to lowest setting by using up/down arrow keys. See page 24.
3. Push the off key on the Pentair temperature controller 7800 (the amber “off “ led will illuminate).
See page 24.
4. Open the access doors.
5. Push in the gas control knob slightly and turn the knob clockwise to “OFF”. See page 5 Natural Gas
Instructions.
6. Wait (5) minutes to clear out any gas. If you then smell gas STOP. Follow the safety information
(stated earlier in the lighting instructions section). If you don’t smell gas, go to the next step. See
page 5 Natural Gas Instructions.
7. Turn the knob on the gas control counter clockwise to the “ON” position. See page 5 Natural Gas
Instructions.
8. Replace the doors.
9. Push either the “Pool” or “Spa” key to start the heater. NOTE: “Pool” key is Factory set at 78° and
“Spa” key is set at 104°.
10. Set the thermostat if needed by using the up/down arrows to set the desired temperature.
a. Fan motor starts, which closes draft proving switch.
b. Ignition module is energized after fan prepurge cycle is completed approximately 2 minutes.
c. Check for powering up the (glow coil) hot-surface ignitor by viewing through the sight glass.
11. The ignitor will warm up and then gas valve opens to ignite the main burners.
12. Heater will operate until desired temperature is reached.
Basic Operation
Rev. C 11-1-01 P/N 471593
21
SAFETY CONTROLS
AIR PRESSURE (FAN) SWITCH
The air pressure switch is a safety device used to insure
that the blower (fan) is operating and has been
designed to monitor the vacuum (negative) pressure
within the blower housing. The air pressures switch
is factory set and is in the ignition module circuit—
the ignition module does not operate unless the air
pressure switch and all safety switches are closed.
NOTE
Some models of MiniMax NT Low NOx heaters,
manufactured before 10-15-01, used both a HIGH
and LOW air pressure switch.
WATER PRESSURE SWITCH
The water pressure safety switch closes when there is
a sufficient flow of water to the heat exchanger to
safely operate the heater. The switch operation must
be verified during initial operation of the heater after
installation—the switch is set at 1 PSIG and the switch
contacts must not be closed in the absence of water
flow. NOTE: See, Below Pool Level Installation
instructions on page 13. The switch may remain closed
with no water flow if there is more than a 3 ft. elevation
difference between the heater (heat exchanger) and
the pool water line—if this is the case, the water
pressure switch must be reset to maintain open switch
contacts with no water flow.
NOTE
If the pool is more than one floor above or one floor
below the heater, the pressure switch may have to
be replaced with a flow switch.
LOW GAS PRESSURE SWITCH
(LOW NOx Versions Only)
The MiniMax NT Low NOx heater uses a low gas
supply pressure switch, ahead of the gas valve, to
prevent operation of the heater when the gas supply
pressure is below the minimum required for proper
operation of the burners. The switch is factory set. In
the event that the switch does not close and prevents
the firing of the heater, the cause of the low gas supply
pressure must be corrected. Typical causes are
undersized supply piping, undersized gas meter or low
gas regulator setting (gas supply regulator and gas
meter problems are typically corrected by your local
gas company).
Basic Operation
AIR PRESSURE SWITCH
Adjustment Knob
Typical Water Pressure Switch
Low Gas Pressure Switch
Figure 18.
Figure 19.
Figure 20.
P/N 471593 Rev. C 11-1-01
22
SAFETY CONTROLS, (cont’d.)
IGNITION MODULE
The Ignition Module is microprocessor based and operates on 24 VAC supplied by the transformer. The
control utilizes a microprocessor to continually and safely monitor, analyze, and control the proper operation
of the gas burners. The module with the presence of the flame sensor/ignitor or remote sensor, using flame
rectification, allows the heater to operate.
HIGH LIMITS
A “High Limit”, is a safety device that opens the electrical circuit and shuts off the heater based on a
temperature set point within the “High Limit Device”. The MiniMax NT Low NOx series of heaters
contains three (3) high limit devices, two (2) are located on the main inlet / outlet header, one sensing the
inlet water temperature and one sensing the outlet water temperature. The third high limit is located on the
exhaust outlet and senses the temperature of the flue gas.
OPERATION OF IGNITION MODULE
HEAT MODE
•When a call for heat is received from the thermostat supplying 24 VAC to the “W” module terminal, the
control will perform a self check routine, flash the diagnostic LED, on units manufactured prior to
10-15-01, (located on the module) for up to four seconds and begins the safety timing ignition sequence.
After the fan prepurge cycle, the hot surface ignitor is activated for a heat-up period followed by
energization of the gas valve for the trial for ignition period.
• When flame is detected during the trial for ignition, the ignitor is deactivated and the gas valve remains
energized. The thermostat and main burner flame are constantly monitored to assure the system
continues to operate properly. When the thermostat is satisfied and the demand for heat ends, the main
valve is de-energized immediately.
FAILURE TO LIGHT-LOCK OUT
Should the main burner fail to light, or flame is not detected during the trial for ignition period, the control
will go into lockout and the gas valve will be turned off immediately. The thermostat controller will display
a flame failure error (icon/service LED) and recovery from lockout requires a manual reset by either
resetting the 7800 Thermostat or removing 24 VAC from the system by turning off main power switch
(located on the junction box behind right door) for a period of 5 seconds.
FLAME FAILURE—RE-IGNITION
If the established flame signal is lost while the burner is operating, the control will respond within 1 second.
The gas valve is de-energized and the control starts a new ignition sequence in an attempt to relight the
burner. If the burner does not relight, the control will go into lockout, requiring a manual reset.
Basic Operation
Rev. C 11-1-01 P/N 471593
23
MINIMAX NT LOW NOx PENTAIR TEMPERATURE CONTROLLER 7800
(See Figure 21, for keypad and Pentair Temperature Controller layout details.)
GENERAL
The MiniMax NT Low NOx Pentair Temperature Controller 7800 is the heart of the
control system. It controls all functions of the heater after first verifying that all safety
controls are functioning normally. If a malfunction is detected, the Pentair Temperature
Controller 7800 will flag the error with both the RED “Service” LED lighting and a
corresponding LCD icon appearing on the Pentair Temperature Controller 7800, pin
pointing the affected safety control(s). NOTE: The exception is the AUX (REMOTE)
LCD icon which appears when a REMOTE Control (or Remote Switch) is connected to
the Pentair Temperature Controller 7800, which overrides the “POOL” and “SPA” keypads
on the control, giving “ON” selection control to the REMOTE.
BASIC THERMOSTAT OPERATION
The Pentair Temperature Controller 7800 comes pre-programmed for use with the spa
temperature set at 104° F. and the pool temperature set for 78° F.— and with default
display mode set to display degrees F. (this may be adjusted to display in degrees C. with jumper on back of board), see
Figure 21.
You need not do anything further to enjoy your heater other than set it in the pool or spa mode by depressing the key
located under the corresponding “POOL” or “SPA” LED light. The LED above the selection will light and the
corresponding “POOL” or “SPA” LCD icon on the display will appear.
NORMAL OPERATION (NO REMOTE)
Each temperature setting in either POOL or SPA mode is settable independently.
If the Factory’s presetting of 78° F. for “Pool” and 104° F. for “Spa” is not desirable, you may adjust these settings. See
page 24 for changing the Factory Temperature Settings. To set the temperature while in SPA mode press the TEMP UP
key (with UP arrow) to increase or TEMP DOWN (with DOWN arrow) to decrease the set temperature to that desired.
NOTE: The left hand display indicates the current real-time temperature. To set the temperature for POOL mode, first
switch to POOL mode by depressing the “POOL” key and repeat the temperature setting procedure in this example. The
Pentair Temperature Controller 7800 remembers the last set temperature for both the POOL and SPA mode and you may
cycle between the two settings with the POOL and SPA selector keys.
In NORMAL operation, pressing the MODE key allows you the cycle between the right-hand display showing the SET
TEMP for the currently active POOL or SPA or the TIME.
Thermostat (Programming & Layout)
DAY ICON
TFUSEAUXFANPRESSH-LMTIGN
DISPLAY IN TIME MODE ONLY
POWER
SERVICE
SYSTEM
HEAT
OFF SPAPOOL TEMP
TEMP
CURRENT TEMP SET TEMP/TIME
NORMAL
FLASH IN PROGRAM MODE
KEYPAD SWITCHES
ALTERNATE DISPLAY
SET
MODE
ALTERNATE DISPLAY C or F.
FAULT CONDITION LCD ICONS
POOL OR SPA
(DISPLAY ALTERNATELY
ON LCD TO SHOW ACTIVE SELECTION)
PROGRAM STEP
F = FAHRENHEIT
C = CELSIUS
P = P.M.
BLANK = A.M.
F = FAHRENHEIT
C = CELSIUS
(Pentair Temperature Controller 7800 Layout)
This icon is not a fault icon
but instead indicates a remote
switching device is connected
to the Pentair Temperature
Controller 7800, and has
overriding selection control
of Pentair Temperature
Controller 7800.
Figure 21.
P/N 471593 Rev. C 11-1-01
24
OFF SPAPOOL
SET
MODE
PROGRAM
TEMP
TEMP
STEP
Increase
Raise
( ) Decrease
Lower
( )
1. Before changing the temperature, make sure the “Temperature” is in the right window, see pages 24
and 25, if “Time” is displayed, press the MODE key to change to the “Temperature Mode”.
2. To change the Pool Temperature setting, press the POOL key.
SET
MODE
PROGRAM
TEMP
TEMP
STEP
until the desired setting is displayed.
NOTE: During Programming of the Pool Temperature, the two buttons on the
right are used to or the display setting numbers.
NOTE: Pool Temperature is now set.
4. You can leave the right window displaying the set “Temperature” or by pressing
the MODE key, you can return to the “Time” Mode.
NOTE: To re-set the Spa Temperature, follow the above steps 1. through 4.
while in the “Spa Heating” Mode.
3. To Raise or Lower the Pool Temperature setting, press the proper TEMP key
TEMP
TEMP
STEP
OFF SPAPOOL
Increase
Raise
( ) Decrease
Lower
( )
TO CHANGE THE FACTORY TEMPERATURE SETTINGS:
TIME SETTING
1. Make sure heater is turned “OFF” and not in the POOL or SPA “ON” Mode.
2. Place the Controller in Programming Mode by depressing the SET and MODE buttons at the same time.
NOTE: During Programming of the Time Setting, the two buttons on the right
are used to or the display setting numbers.
Temperature & Time Setting (Programming)
Rev. C 11-1-01 P/N 471593
25
Time Setting (Programming)
TIME SETTING, (cont’d.)
3. The first setting, once you enter the Programming Mode, will be the Day. The
Day icon will be flashing. Use the UP or DOWN arrow TEMP keys to locate
the appropriate day, then press the SET key. The Day is now set and the Hour
Time icon will start to flash.
4. With Hour Time icon flashing, use the UP/DOWN arrow TEMP keys. Set the
Hour to the proper time, “P” will show to the right for PM, and blank for AM.
Once the proper Hour is visable, press the SET key. The Minute icon’s will
now start flashing.
5. With the Minute icon’s flashing use the UP/DOWN arrow TEMP keys and
select the proper Minute setting, then press the SET key. The Day and Time are
now set and the Day icon will be flashing.
6. Press the SET and MODE keys at the same time to return to the Operational Mode.
SET
MODE
PROGRAM
TEMP
TEMP
STEP
SET
MODE
PROGRAM
TEMP
TEMP
STEP
SET
MODE
PROGRAM
TEMP
TEMP
STEP
SET
MODE
PROGRAM
D
D
D
NOTE
During the programming of the CLOCK/DAY function, you touch only the MODE key and a appears
in the upper left corner of the “Current Temperature Display Area”, this represents a delay function and
will be used for future functions and accessories to the MiniMax NT Low NOx. When the appears,
simply stop the programmaing, “do NOT touch any key for 30 seconds”, the controller will
automatically return to the operating mode, now by pressing the “SET & MODE keys” at the same time,
you will re-enter the programming function, and the icon will disappear.
P/N 471593 Rev. C 11-1-01
26
LOW-NOx
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 ventila-
tion air.
2. Visually inspect the main burner and the hot surface
ignitor. The normal color of the flame is blue. When
flame appears yellow, burners should be inspected
and cleaned. Check ignitor for damage.
3. Keep the heater area clear and free from
combustibles and flammable liquids.
Pressure Relief Valve
In some installations, a pressure relief valve (PVR) is
required on the
MiniMax NT Low
NOx. 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
only thru wall at
bottom of 3/4 in.
NPT port and no
deeper—now thread in the 3/4 NPT PRV. NOTE:
(A.S.M.E. version varies from illustration. It is of bronze
construction, and is supplied with the A.S.M.E. Section
IV, pressure relief valve pre-installed at factory.) Test the
relief valve at least once a year by lifting up lever.
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.
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
WINTER OPERATION
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.
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 NT Low
NOx should not be operated outdoors at temperatures
below 0° F. for propane and -20° F. for natural gas.
FOR PRV
INSTALLATION
DRILL THRU
THE NPT PORT
Figure 23.
Figure 22.
Maintenance
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
23.), 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.)
Rev. C 11-1-01 P/N 471593
27
Maintenance (Water Treatment)
RULE: 7.4 to 7.6 is a desirable pH range. It is essential
to maintain correct pH, see Table 4.
If pH becomes too high (over alkaline), it
has these effects:
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.
Heat exchanger damage resulting from chemical
imbalance is not covered by the warranty.
CAUTION
Muriatic Acid has a pH of about 0. Pure water is 7
(neutral). Weak Lye solution have a pH of 13-14.
pH Chart
Table 3.
Strongly Acid Neutral Strongly Alkaline
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
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.
7.2
6.8 7.0 7.4 7.6 7.8 8.0 8.2 8.4
Add Soda, Ash or
Sodium Bicarbonate
Add AcidMarginalIdealMarginal
pH Control Chart
Table 4.
CHEMICAL BALANCE
POOL AND SPA WATER
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.
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 oxidiz-
able 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 3.
P/N 471593 Rev. C 11-1-01
28
NORMAL OPERATION SEQUENCE
(Refer to Figure 21 of Pentair Temperature Controller 7800 keyboard)
The heater features a fully automated firing start-up and shutdown sequence under the control of the
MiniMax NT Low NOx Pentair Temperature Controller 7800.
Now that the heater has been properly installed and wired for either remote operation or local operation, and
you have setup the Pentair Temperature Controller 7800 temperature setpoints as described earlier in manual
in Thermostat section, the following is the normal operating sequence when the heater turns on the and the
thermostat calls for heat for the pool or spa.
1. The fan will start beginning the heater’s safety prepurging cycle which lasts for 2 minutes. If at anytime
during the prepurge cycle the Pentair Temperature Controller 7800 detects that a safety control is not
working due to either a safety control malfunction or other unsafe condition the firing sequence will stop
until the unsafe condition is removed— “the fault icon related to the problem will illuminate”.
2. After proper completion of the prepurge cycle, the hot surface ignitor (glow coil) will turn on (preheat)
for 40 seconds. Once the 40 seconds is passed, the main gas valve will open. At this time, if flame is not
safely established and is dectected by the flame sensing curcuit, the ignition module and Pentair
Temperature Controller 7800 will shut down and will display an ignition fault and luminate the red
service light. Please note that on initial firing of heater when gas supply piping is full of air or after long
period of non-operation of the heater it is normal for the first ignition attempt to not complete. To clear
the fault condition power to the Pentair Temperature Controller 7800 must be cycled to reset system. If
heater continues to fail to light have heater inspected by a qualified service person before placing heater
back in service.
Insufficient waterflow (pump icon displays), excessive water temperature (high limit icon) cause a
“soft-lockout” of the firing sequence—which means if the cause of the problem clears by itself (or with
human intervention ie., turning on pump, etc.) such as a slow to prime water pump finally pumping
adequate waterflow causing the water pressure (safety) switch to close, the ignition sequence
automatically restarts again.
The other category of fault conditions lead to a “hard lockout” of the firing sequence which require a
qualified service person to correct before the heater is returned to service. In “hard lockout” the heater
must be manually reset (by toggling power to Pentair Temperature Controller 7800) after correction of
the fault condition.
Examples of causes of “hard lockouts” include inadequate gas supply pressure and/or failure of fan or
fan pressure switches, which all appear as air/gas pressure faults illuminating “blower fan” fault icon and
RED “service required” LED.
Troubleshooting—Normal Operation Sequence of Heater
Rev. C 11-1-01 P/N 471593
29
3. After normal firing of the heater (main burners) the heater will continue to operate until the
temperature setpoint is reached (thermostat satisfied). As the pool/spa loses heat the heater will refire
and continue to operate cycling automatically to maintain the selected temperature setpoint for either
the pool or spa. If at anytime during the firing of the heater an unsafe condition is detected the
heater will stop firing and an automatic safe shutdown sequence will begin. Investigate and have
corrected the cause of the abnormal firing termination before placing heater back in operation.
Please Note: During the firing of the heater, you decide to change to the pool or spa selection by
depressing the selector key for “POOL” or “SPA”, the heater will first acknowledge the new selection by
flashing the new selection’s corresponding selection LED “POOL” or “SPA”, however, the heater will first
complete a safe shutdown sequence before automatically switching to the new selected setting and safely
initiating a new firing sequence using the the new temperature setpoint. During this automatic crossover
sequence the keyboard on the Pentair Temperature Controller 7800 will not accept any further keying until
the cycle completes—the exception is you may still stop the heater with the “OFF” key.
Troubleshooting—Normal Operation of Heater
Illustration of Pentair Temperature Controller 7800 with all fault icons displayed for clarity.
TFUSEAUXFANPRESSH-LMTIGN
POWER
SERVICE
SYSTEM
HEAT
OFF SPAPOOL TEMP
TEMP
CURRENT TEMP SET TEMP/TIME
NORMAL
SET
MODE
FAULT CONDITION LCD ICONS
POOL OR SPA
(DISPLAY ALTERNATELY
ON LCD TO SHOW ACTIVE SELECTION)
PROGRAM STEP
Figure 24.
P/N 471593 Rev. C 11-1-01
30
LEGEND OF FAULT ICONS AND TYPE OF PROBLEMS FLAGGED
This fault icon displays whenever there is an unexpected loss of flame.
This condition may arise from air in gas supply line or malfunction of flame
detection circuit or related hardware.This is a hard lockout condition
requiring a manual reset to clear.
This fault icon displays whenever one or more of safety temperature limit
switches open to flag an excessive temperature condition. This is a soft
lockout condition and if the condition clears the fault icon will clear and
normal operation of heater will procede.
This fault icon displays whenever the thermal fuse has opened due to a flame
roll-out or other abnormal condition causing excessive temperatures in the
cabinet. The cause of the fault must be corrected and the one-shot fuse
replaced before icon can be cleared.
This fault icon displays whenever there is a failure of either the low gas
pressure switch (due to low pressure or switch failure) or additionally the fan
and/or air pressure switch circuit has failed resulting in an open safety circuit.
The nature of these faults are mission critical for the safe operation of the
heater and result in a hard lockout. The cause of the fault must be corrected
and the heater will require a manual reset by toggling the power supplied to
the 7800 Controller to clear the fault.
This fault icon displays whenever insufficient waterflow causes the water
pressure switch to fail to close. This is a soft lockout condition and will clear
by itself if the waterflow is restored. The icon will then clear and if the heater
was attempting to fire the cycle will restart and continue.
Troubleshooting & Service
Rev. C 11-1-01 P/N 471593
31
SERVICE CHECKS—IGNITION MODULE
skcehCecivreS
motpmySeruC/esuaC
daeD.1deriwsiM.A
dabremrofsnarT.B
dabrekaerbtiucriC/esuF.C
)noydaetsrofDELkcehc(lortnocdaB.D
noitingion—notatsomrehT.2deriwsiM.A
WlanimrettaegatlovontatsomrehtdaB.B
rotingion,noevlaV.3rotingievitcefeD.A
deriwsiM.B
)rotingitaegatlovkcehc(lortnocdaB.C
evlavon,norotingI.4nepoliocevlaV.A
eriwevlavnepO.B
)2V&1Vneewtebegatlovkcehc(lortnocdaB.C
,IFTgnirudyakoemalF.5
)IFTretfa(esnesemalfon
rotingidaB.A
eriw1SdaB.B
renrubtadnuorgrooP.C
)tnerrucemalfkcehc(emalfrooP.D
FLAME SENSOR CURRENT CHECK
SERVICE CHECKS
Flame current is the current which passes through the flame from the sensor to ground. The minimum flame current necessary to
keep the system from lockout is 0.7 microamps. To measure flame current, connect an analog DC microammeter to the FC1/FC2
terminals per figure. Meter should read 0.7 µA or higher. If meter reads below “0” on scale, meter leads are reversed. Disconnect
power and reconnect meter leads for proper polarity.
MULTI-PURPOSE METER
USE MICROAMP SCALE
RED (+)
BLACK (-)
2465H MODULE
Troubleshooting & Service
Figure 25.
P/N 471593 Rev. C 11-1-01
32
Possible Cause Remedy
Heater will not come on
Automatic ignition system fails Check if electrical connections are
correct and securely fastened –
If YES, call serviceperson.
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 Shut off gas supply and call serviceperson
Heater exchanger scaled Shut off gas supply and call serviceperson
Troubleshooting - General
CAUTION
Please consult the latest edition of the “MiniMax NT Low NOx Service Manual” for complete service and
repair instructions. Repairs should only be attempted by properly trained service personnel.
Rev. C 11-1-01 P/N 471593
33
MINIMAX NT LOW NOx HEATER - (Single Voltage)
1
4
3
5
6
8
9
10
12
26
28
33
34
36
48 47 46
49
44 42
43
38
37
18
17
16
15
21
14
32
39
24
25
2
7
11
22
23
20
19
29
31
30
35
45
41
40
50
13
27
MiniMAX NT Low NOx, Single Voltage
(Manufactured Date Prior to October 15, 2001)
P/N 471593 Rev. C 11-1-01
34
ITEM DESCRIPTION QTY. 250 400
1 Exhaust Grill 1
2 Gasket, Exhaust Grill 1
3To
p
Cover 1 471692 471591
4 Exhaust Ass
y
. 1 471995 471996
5 Shut-off Safet
y
Switch, Exhaust 1
6Blower 1
7 Gasket, Blower 1
8 Flue Collector Ass
y
. 1 472007 472005
9 Return Manifold Ass
y
.1
10 Bolt, Heat Exchan
g
er 16
11 Washer, Heat Exchan
g
er 16
12 Fire box Ass
y
. 1 471835 471821
13 Heat Exchan
g
er Ass
y
. 1 471785 471838
14 Baffle, Heat Exchan
g
er 8 / 16
(
250 / 400
)
471641 471640
15 Thermistor Probe 1
16 HI-Limit Thermostat-115° F. 1
17 Hi-Limit Thermostat-150° F. 1
18 Water Pressure Switch 1
19 Main Manifold Ass
y
.1
20 Ada
p
ter, Bulkhead Rin
g
2
21 Adapter, Bulkhead, 2 in. 2
22 Gasket, Fin Tube, Seal 18
23 Flow Valve Ass
y
.1
24 Gas Pressure Switch 1
25 Sub-Manifold, Gas Su
pp
l
y
1
26 Gas Valve-Natural Gas 1
27 Burner Tra
y
Ass
y
. 1 471836 471822
28 I
g
niter 1 / 2
(
250 / 400
)
29 Gas Manifold Ass
y
. 1 472003 472001
30 Burner 5 / 8
(
250 / 400
)
31 Face Plate 1 471819 471820
32 Jacket, U
pp
er Panel, Left 1
33 Jacket Corner 4
34 Jacket Divider 1 471651 471580
35 Jacket, Lower Panel, Left 1
36 Base 1 471645 471573
37 Jacket Back 1 471669 471574
38 Bracket, Jacket Side 2
39 Jacket, U
pp
er Panel, Ri
g
ht 1
40 Jacket, U
pp
er Sub
p
late 2
41 Jacket, Lower Panel, Ri
g
ht 1
42 Base Heat Shield 1 471646 471579
43 Control Box Ass
y
.1
44 Air Pressure Switch
(
Hi
g
h
)
1
45 Module, I
g
nition Control 1
46 Tem
p
erature Controller 1
47 Ri
g
ht Door Ass
y
.1
48 Left Door Ass
y
. 1 471659 471726
49 Fan S
p
eed Cross-over Board 1 N/A 471859
50 Air Pressure Switch
(
Low
)
1 N/A 471428
NA Gas Orifice, 0-2000 Ft
(
Not Shown
)
5 / 8
(
250 / 400
)
NA Thermal Cut-off
(
Not Shown
)
1
NA Transformer, 40 VA
(
Not Shown
)
1
NA Transformer, .5 KVA, Dual Volta
g
e
(
Not Shown
)
1
Note: Some
p
arts are not listed in above,
p
lease contact Customer Service De
p
artment for detail
471597
274440
471441
070951
471767
471577
471714
471592
471701
471622
471741
471991
471992
471506
471768
471668
471576
471575
471647
471887
471571
471610
072184
471587
471694
471672
075173
471566
471696
471565
471727
471984
MiniMax NT Low NOx Single Voltage Replacement parts
(
Manufactured Date Prior to October 15
,
2001
)
471750
471601
471994
471743
471562
471581
Rev. C 11-1-01 P/N 471593
35
MINIMAX NT LOW NOx HEATER - (Dual Voltage)
1
4
3
5
6
8
9
10
12
26
28
33
34
36
48 47 46 44 42
43
38
37
18
17
16
15
21
14
32
39
24
25
2
7
11
22
23
20
19
29
31
30
35
45
41
40
13
27
MiniMAX NT Low NOx, Dual Voltage
(Manufactured Date After October 15, 2001)
P/N 471593 Rev. C 11-1-01
36
ITEM DESCRIPTION QTY. 200 250 300 400
1 Exhaust Grill 1
2 Gasket, Exhaust Grill 1
3To
p
Cover 1 471885 471692 471886 471591
4 Exhaust Ass
y
. 1 472013
5 Shut-off Safet
y
Switch, Exhaust 1
6 Blower 1 471938 471884
7 Gasket, Blower 1
8 Flue Collector Ass
y
. 1 472008 472007 472006 472005
9 Return Manifold Ass
y
.Non-ASME 1
10 Bolt, Heat Exchan
g
er, Non-ASME 16
11 Washer, Heat Exchan
g
er 16
12 Fire box Ass
y
. 1 471904 471835 471922 471821
13 Heat Exchan
g
er Ass
y
. Non-ASME 1 471910 471785 471928 471838
14 Baffle, Heat Exchan
g
er 8/16
(
200,250,300/400
)
471642 471641 471896 471640
15 Thermistor Probe 1
16 HI-Limit Thermostat-115° F. 1
17 Hi-Limit Thermostat-150° F. 1
18 Water Pressure Switch 1
19 Main Manifold Ass
y
. Non-ASME 1
20 Ada
p
ter, Bulkhead Rin
g
2
21 Ada
p
ter, Bulkhead, 2 in. 2
22 Gasket, Fin Tube, Seal 18
23 Flow Valve Ass
y
.1
24 Gas Pressure Switch 1
25 Sub-Manifold, Gas Su
pp
l
y
1
26 Gas Valve-Natural Gas 1
27 Burner Tra
y
Ass
y
. 1 471905 471836 471923 471981
28 I
g
niter 1
29 Gas Manifold Ass
y
. 1 472004 472003 472002 472001
30 Burner 4/5/6/8
(
200/250/300/400
)
31 Face Plate 1 471871 471819 471873 471977
32 Jacket, U
pp
er Panel, Left 1
33 Jacket Corner 4
34 Jacket Divider 1 471827 471651 471826 471580
35 Jacket, Lower Panel, Left 1
36 Base 1 471829 471645 471828 471573
37 Jacket Back 1 471861 471669 471874 471574
38 Bracket, Jacket Side 2
39 Jacket, U
pp
er Panel, Ri
g
ht 1
40 Jacket, U
pp
er Sub
p
late, Ri
g
ht 2
41 Jacket, Lower Panel, Ri
g
ht 1
42 Base Heat Shield 1 471831 471646 471830 471579
43 Control Box Ass
y
.1
44 Air Pressure Switch 1 471747 471569
45 Module, I
g
nition Control 1
46 Tem
p
erature Controller 1
47 Ri
g
ht Door Ass
y
.1
48 Left Door Ass
y
. 1 471900 471659 471918 471726
NA Gas Orifice, 0-2000 Ft
(
Not Shown
)
4/5/6/8
(
200/250/300/400
)
NA Thermal Cut-off
(
Not Shown
)
1
NA Transformer, 40 VA
(
Not Shown
)
1
Note: Some
p
arts are not listed in above,
p
lease contact Customer Service De
p
artment for detail
MiniMax NT Low NOx Dual Voltage Replacement parts
(
Manufactured Date After October 15
,
2001
)
471610
471991
471622
472014
471883
471592
471701
471714
072184
471566
471587
471694
070951
471672
471597
471601
471750
471506
471992
274440
471441
471696
471668
471581
471647
471575
471768
471576
471767
471577
472015
471893
471743
471571
471565
471985
471984
075173
Rev. C 11-1-01 P/N 471593
37
NOTES
P/N 471593 Rev. C 11-1-01
38
NOTES
Rev. C 11-1-01 P/N 471593
39
NOTES
P/N 471593 Rev. C 11-1-01
40
40
MiniMax NT Low NOx Heaters
Limited Warranty
Your MiniMax NT Low NOx 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 NT Low NOx 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

Navigation menu