Pentair Minimax Nt Standard Series Users Manual 472032_revA.p65

NT Standard Series to the manual 7f5f9daa-fc69-3874-d9c3-4aa5e69a5a4e

2015-02-06

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Rev. A 1-2-02 P/N 472032

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 Standard 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

6,295,980

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

Consumer

Retain For

Future

Reference

P/N 472032 Rev. A 1-2-02

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 ........................................................................................................................... 5

Installation Instructions ............................................................................................ 6

Specifications ............................................................................................................................................................................ 6

Installation — Electrical ............................................................................................................................................................. 7

Installation — Remotes (2 and 3 Wire) ...................................................................................................................................... 8 - 9

Installation — Wiring Diagram ................................................................................................................................................... 10

Installation — Water Connections.............................................................................................................................................. 11

Installation — Plumbing ............................................................................................................................................................. 11

Installation — Gas Line ............................................................................................................................................................. 12

Pipe Sizing Chart/Gas Pressure Requirements ......................................................................................................................... 12

Regulated Manifold Pressure Test ............................................................................................................................................. 12

Venting — Indoor Installations ................................................................................................................................................... 13 - 16

Venting — Outdoor Installations ................................................................................................................................................ 17

Basic Operation — General Description .................................................................................................................................... 18

Basic Operation — Safety Controls ...........................................................................................................................................19 - 20

Basic Operation — HSI Ignition Module .................................................................................................................................... 20

Thermostat (Programming & Layout) ........................................................................................................................................ 21

Temperature & Time Setting (Programming) .............................................................................................................................22 - 23

Maintenance ............................................................................................................................ 24

Maintenance Instructions ........................................................................................................................................................... 24

Pressure Relief Valve ................................................................................................................................................................ 24

Maintenance (Water Treatment) ................................................................................................................................................ 25

Trouble Shooting ....................................................................................................... 26

Normal Operation Sequence ..................................................................................................................................................... 26 - 27

Troubleshooting & Service ......................................................................................................................................................... 27 - 28

Troubleshooting (General) ......................................................................................................................................................... 29

MiniMax NT Standard Parts List & Exploded View (Dual Voltage) ............................................ 30-31

Warranty Information ................................................................................................. Back Cover

Rev. A 1-2-02 P/N 472032

MiniMax NT Standard

Pool and Spa Heaters

Congratulations on your purchase of a MiniMax NT Standard 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 Standard 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 Standard also comes equipped with the Pentair multifunction 7800 temperature controller

which shows, at a glance, the proper functioning of the heater. All HSI (hot-surface ignition) MiniMax NT

Standard heaters are designed with a direct ignition device (HSI) which eliminates the need for a standing

pilot. The MiniMax NT Standard requires an external power source (120/240 VAC 50/60 Hz) to operate.

IMPORTANT NOTICES

...For the installer and operator of the MiniMax NT Standard 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 472032 Rev. A 1-2-02

Operation

This instruction manual provides operating

instructions, installation and service information

for the MiniMax NT Standard high performance

heater. The information in this manual applies to

the MiniMax NT Standard 200, 250, 300, and

400 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 Standard. 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 Standard 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. A 1-2-02 P/N 472032

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 Standard incorporates the

Pentair 7800 temperature controller to aid you

in the operation of the heater, and to assist in

diagnosing a failure in the heater’s function.

MINIMAX NT STANDARD HSI ELECTRONIC IGNITION LIGHTING/OPERATION

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

Gas

Inlet

P/N 472032 Rev. A 1-2-02

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

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

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.

DIMENSIONS IN INCHES

Rev. A 1-2-02 P/N 472032

Installation (Electrical)

ELECTRICAL, for MiniMax NT Standard Heaters

Electrical Rating 50/60 Hz 120 / 240 Volts AC, single phase

NOTE

The MiniMax NT Standard heater is prewired for 240 volt AC connection using the “BROWN” female connector and the

“WHITE” common male connector; see below, Figure 4. If you require the heater to be connected to 120 volts AC, remove

the “BROWN” female connector from the “WHITE” common connector; now locate the “BLUE” female connector and plug it

into the “WHITE” common connector.

When connecting the home wiring to the “Line Terminal Block” inside the junction box, follow the polarity as shown below.

Connecting to 120 VAC, make sure that you connect the positive wire to the positive terminal (L), the neutral wire is

connected to the neutral terminal (N) and the ground is connected to the ground terminal (GND); 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.

GREEN WIRE

WHITE WIRE

BLACK WIRE

GROUND

CONNECTION

NEUTRAL / WHITE 120 VAC

LINE #1 FOR 240 VOLT AC

POSITIVE LINE FOR 120 VOLTS AC

LINE #2 FOR 240 VOLT AC

INTERNAL

FACTORY WIRES

LINE TERMINAL BLOCK

BROWN

FM CONNECTOR

FOR USE WITH

240 VOLT AC

BLUE

FM CONNECTOR

FOR USE WITH

120 VOLT AC

WHITE

COMMON MALE

CONNECTOR

TERMINAL BLOCK

FOR AC INPUT

120 / 240 VOLT SINGLE

PHASE "See Below"

Figure 4.

Figure 5.

P/N 472032 Rev. A 1-2-02

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 22.

2. Now turn the heater to the "OFF" mode by using the "OFF" button

on the temperature controller, see Page 22 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 22. (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/MV

24 VAC

H LIMIT

T FUSE

PRESS

BLOWER

A.C LOAD (PUMP/AUX2)

(PILOT DUTY ONLY)

1234 123 123456 12 12

TEMPERATURE

DISPLAY MODE

5 A FUSE

FOR AUX2 (PILOT DUTY ONLY)

(AUX1)

REMOTE

AIR PRESS

POOL

SPA

GND

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. A 1-2-02 P/N 472032

• 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/MV

24 VAC

H LIMIT

T FUSE

PRESS

BLOWER

A.C LOAD (PUMP/AUX2)

(PILOT DUTY ONLY)

1234 123 123456 12 12

TEMPERATURE

DISPLAY MODE

POOL

5 A FUSE

FOR AUX2 (PILOT DUTY ONLY)

(AUX1)

REMOTE

AIR PRESS

POOL

SPA

GND

POOL

SPA

GND

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 472032 Rev. A 1-2-02

Installation (Dual Voltage Wiring)

MiniMax NT Standard (ALL MODELS) HSI Electronic Ignition Wiring Diagram

(DUAL VOLTAGE)

GRN

IGN MODULE

BURNER

FENWAL

GND

MV1

S1/240

MiniMax NT STANDARD 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

P11

P10

ORG

RED

THERMAL FUSE

WHT

BLU

RED

SWITCH

WATER PRESSURE

THERMAL SWITCHES

EXHAUST HIGH LIMIT

SPDT EXTERNAL SWITCH

GAS VALVE

BLU

WHT

RED

432112312345612

10A

250V

RELAY

250V

10A

250V

RELAY

LIMITS VALVE MODULEPOWERTPROBE

REMOTE

AUX2

123

BLOWER

PENTAIR 7800

TEMPERATURE

PROBE

RED

HIGH LIMIT

THERMAL SWITCHES

COM

SPA

POOL

GRN

AIR

AIR PRESSURE SW.

ORG

BLU

RED

WHT

BLOCK

TERM BBLOCK

TERM A

WHT

BLK

WHT

BLK

WHT

RED

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

240 VAC

BLK

WHT

BLK

YEL

CON-2F

CON-2M

ORG

WHT

RELAY

PRESS SW.

TFUSE GAS IGN

PUMP RELAY

WHT

(WHT)

WHT

BLK

(BRN)

GRN

(BLU)

HOT SURFACE

IGNITOR

FLAME SENSOR

GRY

Rev. A 1-2-02 P/N 472032

PLUMBING CONNECTIONS

The MiniMax NT Standard heater has the unique

capability of direct schedule 40 PVC plumbing

connections. A set of bulkhead fittings is included with

the MiniMax NT Standard 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 Standard 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.

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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 19,

Figure 19.

PUMP

FILTER

POOL

HEATER

CHECK

VALVE

MANUAL

BY-PASS

POOL

GATE

VALVE

CHECK

VALVE

FROM

POOL

Figure 9.

P/N 472032 Rev. A 1-2-02

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 and propane at a 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.

Pipe Sized For Length Of Run In Equivalent Feet

ledoM

002

052

003

004

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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

or 11 in. WC for propane, 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 14 in. WC

Minimum inlet gas pressure **5 in. WC 12 in. WC

Normal manifold pressure 4 in. WC 11 in. WC

*All Readings are taken with the heater fired. Any adjustments

or readings made with heater off will give incorrect readings.

** 6 in. WC for 400 model

OFF

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 STANDARD GAS PRESSURE REQUIREMENTS*

WARNING

Do not install the gas line union inside the heater

cabinet. This will void your warranty.

Propane

Rev. A 1-2-02 P/N 472032

INDOOR VENTING—General Requirements

The vent pipe must be the same size or larger. The MiniMax NT Standard 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 Standard 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 Standard heater and

can be found on page 15. 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 Standard 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.

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Installation (Indoor)

P/N 472032 Rev. A 1-2-02

INDOOR INSTALLATION (USA ONLY)

OUTDOOR SHELTER INSTALLATION (CANADA)

See page 15 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 feet 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)

DOOR

24"

18"

Figure 13.

Figure 11.

Figure 12.

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.

Rev. A 1-2-02 P/N 472032

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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 Standard 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.

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 13 and 14:

BASE FOR USE ON COMBUSTIBLE FLOORS

24 GA. (MIN.) GALVANIZED SHEET METAL.

FOR AIR CIRCULATION). COVER BLOCKS WITH

(LAID WITH ENDS UNSEALED AND JOINTS MATCHED

HOLLOW MASONARY BLOCKS, NOT LESS THAN 4" THICK

SHEET METAL

BLOCKS

6" Min.

Figure 14.

Indoor Vent

Adaptor

Table 2.

P/N 472032 Rev. A 1-2-02

Detail H

INDOOR INSTALLATIONS

MINIMAX NT STANDARD 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.

Air Supply

Ventilation

Air Supply

Combustion

Vent Hood

Walkway

1' min.

above grade

Vent Hood

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.

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:

Recommended sources for

side wall Vent Hood; see page 15,

Section Venting.

(Table 2. on page 15.)

Figure 16.

Installation (Indoor)

Rev. A 1-2-02 P/N 472032

VENTILATION

OUTDOOR INSTALLATION ONLY (Outdoor Shelter Installation in Canada, see page 14)

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.

IMPORTANT!

In an outdoor installation it is important to ensure water is diverted from overhanging eves with a

proper gutter/drainage system. The heater must be set on a level foundation for proper drainage.

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

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.

Vent Termination:

Check local building codes

for setback requirements.

Property Line

Walkway

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

Figure 17.

P/N 472032 Rev. A 1-2-02

GENERAL DESCRIPTION

The MiniMax NT Standard Pool and Spa Heater is a fan-assisted induced draft appliance. The MiniMax NT

Standard 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 Standard 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 15,

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 22.

3. Push the off key on the Pentair temperature controller 7800 (the amber “off “ led will illuminate).

See page 21.

4. Open the access doors.

5. Push in the gas control knob slightly and turn the knob clockwise to “OFF”.

See page 5 for 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 for Instructions.

7. Turn the knob on the gas control counter clockwise to the “ON” position. See page 5 for 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° F. and

“Spa” key is set at 104° F.

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 opening holes

on the face plate.

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. A 1-2-02 P/N 472032

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.

Basic Operation

AIR PRESSURE SWITCH

Adjustment Knob

Typical Water Pressure Switch

Figure 18.

Figure 19.

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 11. The switch may remain closed with no water flow if

there is more than a 3 feet 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.

P/N 472032 Rev. A 1-2-02

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 Standard 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 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. A 1-2-02 P/N 472032

MINIMAX NT STANDARD PENTAIR TEMPERATURE CONTROLLER 7800

(See Figure 20, for keypad and Pentair Temperature Controller 7800 layout details.)

GENERAL

The MiniMax NT Standard 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 20.

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 22 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 20.

P/N 472032 Rev. A 1-2-02

OFF SPAPOOL

SET

MODE

PROGRAM

TEMP

STEP

Increase

Raise

( ) Decrease

Lower

( )

1. Before changing the temperature, make sure the “Temperature” is in the right window, see pages 22

and 23, 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

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

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. A 1-2-02 P/N 472032

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 visible, 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

STEP

SET

MODE

PROGRAM

TEMP

STEP

SET

MODE

PROGRAM

TEMP

STEP

SET

MODE

PROGRAM

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 Standard. When the appears,

simply stop the programming, “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 472032 Rev. A 1-2-02

MAINTENANCE INSTRUCTIONS

It is recommended that you check the following items at

least every six months and at the beginning of every

swimming season.

1. Examine the venting system. Make sure there are no

obstructions in the flow of combustion and

ventilation air.

2. Visually inspect the main burner and the 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

Standard. 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 Standard should

not be operated outdoors at temperatures below 0° F. for

propane and -20° F. for natural gas. Where freezing is

FOR PRV

INSTALLATION

DRILL THRU

THE NPT PORT

Figure 22.

Figure 21.

Maintenance

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 22.), 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.)

STANDARD

Rev. A 1-2-02 P/N 472032

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 472032 Rev. A 1-2-02

NORMAL OPERATION SEQUENCE

(Refer to Figure 20 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 Standard 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 1 minute. 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 and the heater will fire. At

this time, if flame is not safely established as detected by the flame sensing circuit, 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.

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 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 Sequence of Heater

Rev. A 1-2-02 P/N 472032

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 23.

SERVICE CHECKS—IGNITION MODULE

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noitingion—notatsomrehT.2deriwsiM.A

WlanimrettaegatlovontatsomrehtdaB.B

rotingion,noevlaV.3rotingievitcefeD.A

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)rotingitaegatlovkcehc(lortnocdaB.C

evlavon,norotingI.4nepoliocevlaV.A

eriwevlavnepO.B

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,IFTgnirudyakoemalF.5

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P/N 472032 Rev. A 1-2-02

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 proceed.

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. A 1-2-02 P/N 472032

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

P/N 472032 Rev. A 1-2-02

MINIMAX NT STANDARD HEATER - (Dual Voltage)

48 47 46 44 42

Rev. A 1-2-02 P/N 472032

Note: Some parts are not listed in above table, please contact our Customer Service Department for details.

ITEM DESCRIPTION QTY. 200 250 300 400

1 Exhaust Grill 1

2 Gasket, Exhaust Grill 1

3 Top Cover 1 471885 471692 471886 471591

4 Exhaust Assy. 1 472030 472040

5 Shut-off Safety Switch, Exhaust 1

6 Blower 1 471938 471884

7 Gasket, Blower 1

8 Flue Collector Assy. 1 472008 472007 472006 472005

9 Return Manifold Assy. Non-ASME 1

10 Bolt, Heat Exchanger, Non-ASME 16

11 Washer, Heat Exchanger 16

12 Fire box Assy. 1 471904 471835 471922 471821

13 Heat Exchanger Assy. Non-ASME 1 471910 471785 471928 471838

14 Baffle, Heat Exchanger 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 Assy. Non-ASME 1

20 Adapter, Bulkhead Ring 2

21 Adapter, Bulkhead, 2 in. 2

22 Gasket, Fin Tube, Seal 18

23 Flow Valve Assy. 1

24 Bracket, Gas Valve 1

Orifice, Natural Gas, 0-2000 Ft.

Orifice, Propane, 0-2000 Ft.

Gas Valve-Natural Gas

Gas Valve-Propane

Burner Tray Assy. Natural Gas 472042 472037 472033 472028

Burner Tray Assy. Propane 471907 471913 471925 471931

28 Igniter 1

Gas Manifold Assy. Natural Gas 472023 472022 472021 472020

Gas Manifold Assy. Propane 472027 472026 472025 472024

Burner Only 2 / 3 / 4 / 6(200/250/300/400)

Burner with Bracket 2

31 Flame Sensor 1

32 Jacket, Upper 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, Upper Panel, Right 1

40 Jacket, Upper Subplate, Right 2

41 Jacket, Lower Panel, Right 1

42 Base Heat Shield 1 471831 471646 471830 471579

43 Control Box Assy. 1

44 Air Pressure Switch 1 471747 471743 471897 471569

45 Module, Ignition Control 1

46 Temperature Controller 1

47 Right Door Assy. 1

48 Left Door Assy. 1 471900 471659 471918 471726

49 Bracket, Front Burner Tray 1 471891 471656 471890 471630

50 Shield, Front Burner Tray 1 471821 471655 471805 471631

NA Thermal Cut-off (Not Shown) 1

4 / 5 / 6 / 8(200/250/300/400) 073727

30 471970

26 471671

471602

070230

471581

471647

471575

471603

471985

075173

471768

471576

471767

471577

472015

471893

471565

471694

070951

471672

471601

471750

471993

274440

471441

073728

471990

472030

072184

471566

471587

27 1

MiniMax NT Standard Dual Voltage Replacement Parts

471610

471991

471622

471883

471592

471701

471714

P/N 472032 Rev. A 1-2-02

MiniMax NT Standard Heaters

Limited Warranty

Your MiniMax NT Standard 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 Standard 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

Pentair Minimax Nt Standard Series Users Manual 472032_revA.p65

NT Standard Series to the manual 7f5f9daa-fc69-3874-d9c3-4aa5e69a5a4e

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