MiniMax® NT Heater
Digital Display Temperature Controller (DDTC)
Installation Instructions
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Table of Contents
SECTION I. INSTALLATION .............................................................................................................................. 2
SECTION II. WIRING ............................................................................................................................................ 2
SECTION III. INTRODUCTION OF DDTC ...........................................................................................................7
SECTION IV. SET UP ............................................................................................................................................. 8
SECTION V. LED INDICATORS .......................................................................................................................... 8
SECTION VI. TEMPERATURE SETTING ............................................................................................................ 9
SECTION VII. HEATING MODE SELECTION ...................................................................................................... 9
SECTION VIII. REMOTE CONTROL ....................................................................................................................... 9
SECTION IX. TROUBLE SHOOTING ..................................................................................................................10
SECTION X. MINIMAX NT HEATER DDTC RETROFIT KIT PARTS .......................................................... 12
This instruction is to be used with the DDTC Retrofit Kit (P/N 472377) to replace the 6800 Temperature
Controller for all Pentair Pool Products NT Heaters.
DANGER
FOR YOUR SAFETY – READ BEFORE OPERATING
This product must be installed and serviced by a professional service technician qualified in pool/spa heater
installation and maintenance. If you do not follow these instructions exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
WARNING
Before installing this product, read and follow all warning notices and instructions which are included. Failure
to follow safety warnings and instructions can result in severe injury, death, or property damage.
Call (800) 831-7133 for additional free copies of this manual.
Important Notice
Attention Installer.
This manual contains important information about the installation, operation and safe use of this
product. This information should be given to the owner/operator of this equipment.
Pentair Pool Products
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 West Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400
Rev. B 1-20-04 1 P/N 472299
SECTION I. INSTALLATION
PANEL
DDTC COVER
BARRIER
(RAIN SHIELD)
DDTC PLATE
GASKET, DDTC PLATE
GASKET, DDTC COVER
1. Turn off the electrical power to the heater.
Figure 1.
2. Open the heater’s right door.
3. Disconnect all wires from the
6800 Temperature Controller.
4. Remove the left and right doors from the
heater if necessary.
5. Remove four screws on the cover of the
6800 Temperature Controller.
6. Remove the existing rain shield if any.
7. Install the mounting plate gasket before
putting DDTC board into the place,
see Figure 1 and Figure 2.
NOTE: Install mounting plate gasket before
installing face plate for DDTC board.
8. Install the cover gasket, DDTC cover, and
rain shield by using six screws, (six screws
are provided in the kit). See Figure 3.
9. NOTE: Apply some silicone between gasket and mounting frame to keep waterproof.
Do NOT over tighten screws on DDTC cover or gasket will be displaced.
10. Reconnect the wires per Section II. Wiring, below.
SECTION II. WIRING
1. Please see wiring diagram's, Figure 4 for MiniMax NT LN DV Heater, Figure 5 for
MiniMax NT DV Heater, and Figure 6 for MiniMax NT TSI LN Heater and follow the
instructions below exactly.
2. Reconnect the wire P4 to J4, P7 to J7, P9 to J9, P10 to J10, and P11 to J11 respectively
on the DDTC board.
3. Connect orange wire assembly from “FAN” of DDTC board to air pressure switch.
4. Disconnect the orange wire assembly from transformer to “24VAC” of Ignition Module.
5. Connect orange wire assembly (same wire as above #4) from “24VAC” of DDTC board to
“24VAC” of Ignition Module.
6. NOTE: Orange wire from transformer to module will no longer be used.
P/N 472299 2 Rev. B 1-20-04
Figure 2.
Apply silicone between the gasket
and rear-mounting frame.
Apply silicone between the gasket
and front-mounting frame.
Secure DDTC cover and rain
shield by using six screws.
Figure 3.
Rev. B 1-20-04 3 P/N 472299
FROM
TERM
BLOCK
120 VAC OR240 VAC
GRN
WHT
2
1
WHT
BLK
3
BLK
GREEN SCREW
ATTACH
GROUND
WIRE
HERE
GRN
(ON THE SIDE JACKET)
BLK
WHT
TRANSFORMER
BLOCK
TERM
ORG
PUR
RED
RED/WHT
BLK
BLK
WHT
WHT
1
2
WHT
BLK
WHT
CON-FEM(BLU)
FOR 120 VAC
BLU
YEL
BLK
CON-MAL(WHT)
BLK/WHT
WHT
BLK
3
WHT
BLK
4
5
BLK
WHT
GRN
GAS VALVE
MV
MV
RED
WHT
BLU
WHT
WHT
FOR 240 VAC
CON-FEM(BRN)
YEL
GRN
YEL
BLK
ORG
HOT SURFACE
PUR
IGNITOR
WHT
WHT
BLOWER
BURNER
WHT
P1
F1
WHT
IGN/120
BLU
IF ORIGINAL FACTORY WIRING MUST BE REPLACED,
INSTALLER MUST SUPPLY UL/CSA APPROVED WIRE
WITH 18 AWG, 600V, 105˚ C TEMP. RATING.
THERMAL FUSE WIRING MUST BE REPLACED WITH
INTERCONNECTING WIRING TO APPLIANCE MUST
CONFORM TO THE NATIONAL ELECTRICAL CODE OR
SUPERSEDE LOCAL(WIRING) CODES.
18 AWG, 600V, 150˚ C TEMP. RATING.
ORG
ORG
P2
IND
F2
24 VAC
IGN MODULE
GND
VAL
TH
IGN
L2
L1
IGN/240
YEL
BLK
WHT
WHT
FS
WHT
WHT
BLU
RED
RED
WHT
BLU
ORG
ORG
ORG
IGN MODULE
J10 J11
VLV
SW/HL/TFUSE
J4 J7
P4 P7 P10 P11
24V
24 VAC FAN
COM NO
ORG
TPROBE
ORG
AIR PRESS. SW.
DDTC
J9
J5
POOL
J8
COM
J6
SPA
WHT
P9
GRN
THERMAL FUSE
WHT
WHT
WHT
RED
RED
ORG
150˚F
HIGH LIMIT
BLK/WHT
115˚F
HIGH LIMIT
MiniMax NT LN Dual Voltage W/DDTC Wiring Diagram
WHT
ORG
SWITCH
WATER PRESSURE
BLK
RED/WHT
RED
ORG
GRN
TEMP.
WHT
WHT
FOR
SYSTEMS
REMOTE CONTROL
SEE INSTRUCTIONS
LOW GAS
PRESSURE SW.
Figure 4.
P/N 472299 4 Rev. B 1-20-04
FROM
TERM
BLOCK
120 VAC OR240 VAC
GRN
WHT
2
1
WHT
BLK
3
BLK
GREEN SCREW
ATTACH
GROUND
WIRE
HERE
GRN
(ON THE SIDE JACKET)
BLK
WHT
TRANSFORMER
BLOCK
TERM
ORG
PUR
RED
RED/WHT
BLK
WHT
WHT
1
2
WHT
BLK
WHT
CON-FEM(BLU)
FOR 120 VAC
BLU
YEL
BLK
CON-MAL(WHT)
BLK/WHT
BLK
WHT
BLK
3
WHT
BLK
4
5
BLK
WHT
GRN
GAS VALVE
MV
MV
RED
WHT
BLU
WHT
WHT
FOR 240 VAC
CON-FEM(BRN)
YEL
YEL
BLK
IGNITOR
HOT SURFACE
ORG
WHT
PUR
WHT
WHT
BLOWER
FLAME
SENSOR
BURNER
WHT
P1
F1
IF ORIGINAL FACTORY WIRING MUST BE REPLACED,
INSTALLER MUST SUPPLY UL/CSA APPROVED WIRE
WITH 18 AWG, 600V, 105˚ C TEMP. RATING.
THERMAL FUSE WIRING MUST BE REPLACED WITH
INTERCONNECTING WIRING TO APPLIANCE MUST
CONFORM TO THE NATIONAL ELECTRICAL CODE OR
SUPERSEDE LOCAL(WIRING) CODES.
18 AWG, 600V, 150˚ C TEMP. RATING.
WHT
ORG
ORG
P2
IND
F2
24 VAC
IGN MODULE
IGN/120
YEL
BLU
IGN/240
BLK
FS
GND
VAL
TH
IGN
L2
L1
WHT
BLU
WHT
WHT
WHT
RED
WHT
RED
WHT
BLU
ORG
ORG
IGN MODULE
J10 J11
VLV
SW/HL/TFUSE
J4 J7
P4 P7 P10 P11
24V
24 VAC FAN
WHT
COM NO
AIR PRESS. SW.
G
R
O
ORG
DDTC
J9
TPROBE
J5
POOL
J8
COM
J6
SPA
P9
SEE INSTRUCTIONS
THERMAL FUSE
WHT
WHT
WHT
RED
RED
ORG
150˚F
HIGH LIMIT
BLK/WHT
115˚F
HIGH LIMIT
MiniMax NT STD Dual Voltage W/DDTC Wiring Diagram
WHT
ORG
SWITCH
WATER PRESSURE
BLK
RED/WHT
RED
ORG
GRN
TEMP.
PROBE
WHT
WHT
FOR
SYSTEMS
REMOTE CONTROL
Figure 5.
Rev. B 1-20-04 5 P/N 472299
FOR 120 VAC
CON-FEM(BL)
A
TERM
B
TERM
BLOCK
BLOCK
G
G
1
BK
BL
OR
120 VAC
W
N
W
W
2
W
W
240 VAC
BK
L
BK
BK
3
BK
G
ATTACH
BOND LOG
(ON THE SIDE JACKET)
W
5
4
W
BK
FOR 240 VAC
CON-FEM(BR)
GROUND
W
Y
WIRE HERE
WIRE COLOR CODE
BK : BLACK
BK
Y
BK
O
BL : BLUE
PR
BR : BROWN
R : RED
Y
BK
PR O
O : ORANGE
Y : YELLOW
BLOWER
G : GREEN
GY : GRAY
W
PR : PURPLE
W : WHITE
R/W : RED W/WHITE TRACE
O
W
W
BK/W : BLACK W/WHITE TRACE
IF ORIGINAL FACTORY WIRING MUST BE REPLACED,
INSTALLER MUST SUPPLY UL/CSA APPROVED WIRE
WITH 18 AWG, 600V, 105˚ C TEMP. RATING.
THERMAL FUSE WIRING MUST BE REPLACED WITH
18 AWG, 600V, 150˚ C TEMP. RATING.
Y
CON-MAL(W)
R
R/W
BK
BK
BK/W
O
PR
W
W
THERMAL FUSE
W
R
G
GAS VALVE
R
W
R
MV
BL
MV
W
W
W
W
O
GY
SWITCH
WATER PRESSURE
O
W
HOT SURFACE
W
R
SEE OPERATION
FLAME SENSOR
IGNITER
BR
O
BL
MANUAL FOR
& INSTALLATION
REMOTE CONTROL
P11
PI0P4 P7
{
F1 F2
IGN/
240
Y
J11
IGN MOD
JI0
VLV
J7
TFUSE/HLMT/PRESS
J4
24V
FAN
J2
24VAC
J1
SPA
COM
POOL
J5 J6J8
+
24
FC
VAC
-
IGN/
L1
120
BL
BL
BK
J9
P9
GY
THERMISTER
VAL GNDPS THFS
R
O
W
BL
DDTC
115˚F
HIGH LIMITS
MiniMax NT TSI w/DDTC WIRING DIAGRAM
150˚F
G
O
R
BK
R/W
BK/W
NO
COM
GY
BLOWER
AIR PRESSURE SW.
O
O
Figure 6.
P/N 472299 6 Rev. B 1-20-04
POWER
PRESSURE SW
REMOTE
POOL
REMOTE BUTTON
POOL BUTTON
SYSTEM
INDICATOR
LIGHTS
THERMOSTAT
HEATING
SERVICE
TEMPERATURE SETTING
POOL SPA
SPA
OFF
SPA BUTTON
OFF BUTTON
TEMP. UP
PRESS ANY ARROW ONCE TO
CHECK SET TEMPERATURE
SPA AND POOL
TEMPERATURE
SET BUTTONS
Figure 7.
TEMP. DOWN
SECTION III. INTRODUCTION OF DDTC
The DDTC board, shown in Figure 7, is a digital temperature controller capable of controlling the pool,
spa or both to a minimum temperature of 65° F. (below 65° F. display reads "Off") and a maximum of
104° F. The DDTC board also functions as a system status indicator, using LED lights and programmed
error codes.
During normal operation, the DDTC will display the current temperature of the water returning to the
heater, depending on which mode has been selected, “Pool” or “Spa”. This is accomplished by a
thermister (sensor) on the inlet port of the water header of the heater and working in conjunction with
the internal microprocessor controlling the operation of the heater.
Changing the desired pool or spa temperature is easily done by simply depressing the appropriate up or
down arrow until the display reads the desired set-point temperature. For example, set pool to 78° F.
and the spa to 104° F., when releasing the up or down arrow the display will flash once then return to
the current temperature.
At any time, you wish to know the temperature setting of the pool or spa, simply press the appropriate
up or down arrow, the display will flash once and display the set-point temperature for three (3) seconds,
then flash once again and return to the current temperature.
Rev. B 1-20-04 7 P/N 472299
SECTION IV. SET UP
The MiniMax NT Heater comes from the factory preset with a pool temperature setting of 78° F. and
a preset spa temperature of 100° F., and in the off mode setting. Once the power is turned on, the
DDTC board will do a self diagnostic internal check, during this time the display will first read “888”,
then the display will switch to three dashes “- - -“, this process takes approximately ten (10) seconds.
The DDTC will then illuminate the “Power” LED and “Off” LED, see Figure 8.
1. Turn on the power to the heater; the switch is on the bottom of the electrical junction box located
internally on the right side of the cabinet. The DDTC will now go through the self-diagnostic’s test
as stated above.
2. Turn on the circulating system pump and make sure that adequate water is being delivered
to the heater, The “PRESSURE SW” LED will now illuminate.
3. If you are using the heater with a remote control system, open the right door of the heater
to access the rear portion of the DDTC. Locate the three terminals marked “Pool” (J5),
“Spa” (J6) and “Com” (J8). If the remote system is a three-wire remote unit, connect the
pool lead to the “pool” terminal J5, connect the spa lead to the “spa” J6 terminal and connect
the common wire to the “com” terminal J8. If the remote system is a two-wire remote, the remote
system will be used to turn the heater on for a selected body of water, Pool or Spa, select which
application you are working with and connect one wire to the common terminal J8 and the other
wire to either “Pool J5” or “Spa J6”. Close and latch the door.
SECTION V. LED INDICATORS
There are nine lights that can be seen from the front of the control panel, (five are system indicators and
four are mode indicators), which helps you understand the operation of the heater, see Figure 7.
If something should go wrong, the lights will aid in troubleshooting the problem. An additional four lights
can be seen after opening the control panel. These four lights are diagnostic indicators for the service
technician to troubleshoot the system.
On the right front of the DDTC board there are four Buttons and corresponding LED lights,
see Figure 7. Using the buttons allows you to select one of the four modes and the lights indicate which
operational mode that the heater is in, Off, Spa mode, Pool mode or Remote mode. If the heater is
not connected to a remote system then the remote mode will not be used.
The following are descriptions of the five system indicators:
• POWER
The light is on at all times, in any switch position, indicating 24VAC power is being supplied to the
control circuit. If it fails to light, no other light will be on. Possible causes are:
1. External power to the heater is disconnected; check service panel circuit breaker or fuses;
2. Transformer has failed.
• PRESSURE SW (WATER PRESSURE SWITCH)
This light is on when Spa/Pool Selector switch is on, indicates the circulating pump is running properly.
If pressure light fails to light, the pump may have lost its prime or water flow may be restricted by an
inadvertently closed valve or clogged filter or pump basket. If you have determined that there is no
water flow restriction to the heater, you should call a qualified technician.
P/N 472299 8 Rev. B 1-20-04
• THERMOSTAT
This light is on when the thermostat contacts close, signaled by the water temperature falling below the
set-point, calling for the heater to fire to maintain the desired water temperature.
• HEATING
The heating light is on any time the thermostat has signaled a call for heat which initializes the ignition
safety circuit — the light comes on indicating successful firing of the main burners and stays on until the
pool/spa reach the water temperature setting.
• SERVICE
The service light is off during normal operation of heater. The light only comes on if a problem with a
control has occurred or when the heater is first firing. The problem must be investigated by the technician
prior to attempts to fire the heater again.
SECTION VI. TEMPERATURE SETTING
The heater comes factory set at 78° F. for the pool mode and 100° F. for the spa mode, using the
up and down arrows, you can set the thermostats to a minimum temperature of 65° F., or a maximum
of 104° F. If you desire to heat only one body of water, the thermostat is capable of an off mode. As
an example, if you only wish to heat the spa and not the pool, simple depress and hold the pool down
arrow, and the thermostat will lower its setting to 65° F. then go to an off mode. If there is a remote
system connected to the heater, please see the special thermostat setting features under Heating Mode
Selection & Remote mode.
SECTION VII. HEATING MODE SELECTION
1. Off Mode: The heater will not come on. NOTE: The "Off" display on the Digital Display
Temperature Controller does not mean that the heater is off. It only states that the pool or spa
thermostat has been turned off.
2. Spa Mode: The heater will operate and heat the spa to the desired temperature.
3. Pool Mode: The heater will operate and heat the pool to the desired temperature.
4. Remote Mode: The DDTC is compatible with two and three wire remote control systems.
In order to operate by a remote control system, the REMOTE mode must be selected on the
front panel. When the REMOTE mode is selected, the REMOTE LED will light up.
SECTION VIII. REMOTE CONTROL
THE TWO-WIRE REMOTE CONTROL SYSTEM is typically installed and connected to the heater
for spa heating. The two-wire remote system is usually provided with a water temperature sensor that
monitors the system temperature and turns the heater on or off in response to the temperature of the spa.
To heat a spa, it should be connected to terminals J6 and J8. Pool heating remote control would
require connecting to terminals J5 and J8. If the REMOTE mode is set at the front panel LED light,
the DDTC will respond to a contact closure by remote system and heater will operate until the remote
system temperature setting is satisfied.
Rev. B 1-20-04 9 P/N 472299
NOTE: With this type of two-wire remote, with its own temperature sensors and system control,
using the up arrows on the front of the DDTC, hold down the up arrow until you reach the maximum
setting of 104° F., this allows the remote system thermostat to operate the heater at any set-point
below 104° F., the heater thermostats then act as a secondary controller if water temperature
reaches 104° F.
THE THREE-WIRE REMOTE CONTROL SYSTEM will be connected to terminals J5, J6 & J8.
J8 is the common terminal. If the heater is in the REMOTE mode, the DDTC will monitor the terminals
and respond to a contact closure between J5 & J8 or J6 & J8. A contact closure between J5 & J8 will
cause the DDTC to switch to the POOL setting and control the heater to the DDTC pool set-point
temperature. A contact closure between J6 & J8 will cause the DDTC to switch to the SPA setting and
control the heater to the DDTC spa set-point temperature. If only heating the spa, then depress the pool
down arrow until the display goes to “Off”.
SECTION IX. TROUBLE SHOOTING
The DDTC temperature display contains three LED’s with a decimal point between the first and second,
this display is also used to display an error code if for some reason there is a failure within the heater
control system or a DDTC internal fault. The DDTC will display the actual temperature or set-point
temperature or OFF, as selected by the user. When DDTC detects an error, the display will show Exx,
see Figure 8, where Exx is the error code of DDTC fault, see Table 1. Codes 1 through 9 indicate a
“soft lockout” error that means after these errors are fixed, the heater will resume normal operation and
restart immediately. Code ERR indicates a “hard lockout” error that means after these errors are fixed,
you need to reset the power of the heater through the switch on the bottom of the electrical junction box
on the right side of the cabinet.
NOTE: If Code ERR is shown on the LED display at any time, turn the heater off, (from power switch),
then turn on the heater again. If the error code is still displayed, call a certified Pentair Service Technician
for repair.
edoCrorrEnoitpircseDrorrE
10EegatloVwoLmetsyS
20EtimiLerutarepmeThgiH
30EnepOesuFlamrehT
40EeruliaFnaF
50EeruliaFemalF/noitingI
60EeruliaFeludoM/evlaVniaMsaG
90E,80E,70EdesUtoN
RRE
Table 1.
P/N 472299 10 Rev. B 1-20-04
3317-138)008(:tatnemtrapeDecivreSlacinhceTs'riatnePllaC
Figure 8.
Rev. B 1-20-04 11 P/N 472299
SECTION X. MINIMAX NT HEATER DDTC RETROFIT KIT PARTS
P/N Description Qty.
072204 Wire Tie 2
471870 Wire Assembly, Orange 2
472060 Silicone Tube 1
472100 DDTC Board 1
472256 Gasket, DDTC Cover 1
472257 Gasket, DDTC Mounting Plate 1
472299 Instruction Sheet, DDTC Retrofit Kit 1
472379 DDTC Cover w/Label 1
472380 Barrier (Rain Shield) 1
472381 ¼ in. Female to Double Male, Piggyback 1
472383 DDTC Mounting Plate w/Label 1
98212800 Screw, #6 X 5/8 in. 6
SAVE THESE INSTRUCTIONS.
Pentair Pool Products
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 West Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400
P/N 472299 12 Rev. B 1-20-04
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