nxt-11 electronic sauna control

nxt-11 electronic sauna control
NXT-11 ELECTRONIC SAUNA CONTROL
KEYPAD
Mount outside sauna
(2 gang box by others)
Control wire runs back to
Main Board.
Sensor runs into sauna
CONTROL MAIN BOARD
Installed between breaker
and heater. (Usually near
electrical panel)
Control wire runs to
Keypad
NXT-11 ELECTRONIC CONTROL
INSTALLATION & OPERATION
Wiring for heaters 4kw, 5kw & 6kw / 240 volt / 1 Phase
Circuit Breaker
Control Circuit Board
(usually installed near breaker panel)
Watts
Volts
diagnostic indicator diodes
4000
5000
6000
240
240
240
L2 L1
HTR
10
10
8
30
30
40
red
white
green
black
shld
HTR
Operation
connect shield wire
at control circuit board
18/4 or 22/4
copper control wire
(Not Included)
** See programming instruction sheet
for set up of control
black
green
white
red
2 gang box
(by others)
Keypad
1
1
1
Circuit
Breaker
test
L1
L2
(install keypad
outside sauna
next to door)
Phase
Wire
Size
Sensor
bulb
12' sensor wire included
If longer required, use 18/2
to extend (not included)
Sensing bulb comes with wire lead. Field
supply sensor wire from keypad to sensing
bulb. Sensing bulb should be located at
ceiling 3' - 4' from heater.
L1
L2
Sauna Heater
Installation Tips
1. Avoid static build up when control sensor bulb
are handled.
2. Avoid running sensor bulb capillary wire too close
to line power lines.
3. In order to install control in electrical box, front
grounding screws may have to removed.
NXT-11 CONTROL with CONTACTOR
CONTACTOR DETAIL
7.5 - 18KW / 1 - 3 PHASE ( & 6KW / 208 Volt )
Ensure that correct voltage is
applied to the contactor coil.
Control Wire (#14)
Supply Wire
Dotted Line for 3 Phase Only
Control Circuit Board
(usually installed near breaker panel)
diagnostic indicator diodes
HTR
test
For 7.5 - 9 KW
single phase units.
For 12 KW
1 phase units.
40 Amp. Res. (7.5 kw, 240 v, 1phase)
50 Amp. Res. (9 kw, 240 v, 1 phase)
63 Amp. Res.
(12 kw, 240 v, 1 phase)
connect
using opposing
contacts
red
white
green
black
shld
L1
L2
Here are some samples of the different types of
contactors used depending upon wattage and
phase of the heater. The broken lines represent
the coil in the middle of the contactor.
HTR
L1 L2 L3
Coil connections at sides.
Coil connections at bottom.
2 gang box
(by others)
black
18/4 or 22/4
copper wire
3 phase units.
Keypad
green
white
red
Breaker
Panel
connect shield wire
at control circuit board
Coil connections
at bottom.
(install keypad
outside sauna
next to door)
Sensor
bulb
L1 L2 L3
COIL
L1 L2 L3
Sensing bulb comes with wire lead. Field
supply sensor wire from keypad to sensing
bulb. Sensing bulb should be located at
ceiling 3' - 4' from heater.
T1 Heater
T2 Hi-Limit
Contactor
40 Amp. Res. (6kw to 12 kw, 208 v, 3 phase)
50 Amp. Res. (15 kw, 208 v, 3 phase)
63 Amp. Res. (18 kw, 208 v, 3 phase)
12' sensor wire included
If longer required, use 18/2
to extend (not included)
L3
L2
L1
Sauna
Heater
Watts
6000
7500
7500
9000
9000
Volts
208
240
208
240
208
12000
12000
15000
18000
240
208
208
208
Phase
3
1
3
1
3
1
3
3
3
Wire
Size
10
8
10
8
8
6
8
6
6
Circuit
Breaker
30
40
30
50
40
60
50
60
70
Electronic Control Operation Manual
Sleep mode: When control is inactive for 10 minutes, it goes in to “sleep” mode. In sleep mode a red dot
cursors across the time and temperature display windows.
Off Mode:
Pressing any button “wakes” the control, and puts it into “Off” mode. When in “Off” mode, the
time window reads “OFF”” and temperature window shows current room temperature.
Standby:
Press “on/off” once. Control will enter “Standby” mode. Time window will show default time of 60
minutes. Temperature window will show current set point (defaults to set point of last use).
From “standby” you can access time and temperature controls and delay start features.
Quick Start: You can “Quick Start” the sauna by pressing “on/off” a second time. Sauna defaults to 60
minutes and last programmed temperature. Or change temperature and time, then push “on/off”
second time.
On:
Off:
When operational, a small dot will flash in the temperature window and the time window will flash
between the word “on” and the remaining time.
Pressing the “on/off” a third time will turn off the sauna.
Temperature:From standby or when sauna is in operation. Press and hold temperature button. Temperature
display will switch to set point. Using the up and down icons, set the desired temperature.
Note: Sauna control will default to last set temperature.
Time:
From standby or when sauna is in operation. Press and hold time button. Using the up and down
icons, set the desired temperature.
Delay Start: Sauna control can be programmed to delay start up to 10 hours in advance. From “standby”
mode, press and hold delay button. Using up and down icons, set delay duration. Press “on/off”
button to engage delay. When in delay mode temperature window will display the word “dEL”.
Time window will display delay duration. Delay will show countdown to zero one minute at a
time.
Delay can be set for up to 10 hours. Delay start displays hours and minutes. For example: 5 =
five minutes, 15 = 15 minutes 1.20 = one hour, twenty minutes;
Time Clock: The sauna control can be programmed to start at a specified time up to seven days in advance.
In order for the time clock preset to work the control internal clock must first be set.
Setting the clock:
From Off mode: Press and hold “TIME” and “ON/OFF” buttons for 4 seconds. Time window will
first show “dAY”. Temperature window will default to “1”. Use up/down buttons to program
current day. 1=Sunday, 2=Monday, etc. Press “ON/OFF” button and time window display “hr”
(hour). Use up/down buttons to program current hour. (Operates on military time; i.e. 2 = 2:00
a.m., 14 = 2:00 p.m.). Press “ON/OFF” again and time window will display “nln” (minutes). Use
up/down buttons to program current minutes (1-59). Press “ON/OFF” one last time to engage.
Programming the time clock start
From off mode: Press and hold up “DELAY” and “ON/OFF” buttons for 4 seconds Display will
change to “ dEL” “Srt” (for delay start). Press “ON/OFF” once. Display will show “dEL” “Off”.
Press “up” arrow to turn on time clock..Display will read “dEL” “on”. Press on/off to beging
programming. Display will read “dAY” “1”. Program day,hour & minutes as you did for setting up
clock. Press “ON/OFF” one last time to engage time clock. Display will read “on” “tc”
Note: As a safety measure, the time clock start clears after use.
Set Up:
The control has certain programmable features and lockouts. To access these features Push
and hold the “up” and “down” button for about eight seconds. Time window will display “rev”.
Pressing “set up” consecutively will give the following: Celsius vs. Fahrenheit, Lock 1, Lock 2,
Lock 3, Lock 4. You must press the set button repeatedly to the end to get out of “setup” mode.
C. vs. F.:
First set up option is temperature scale. The control defaults to Celsius. For Fahrenheit, press
up or down button. Display in “time” window will change from “C” to “F”. Press set.
Lock 1:
Lock 1 is a general lock out or “child safe” mode. When lock 1 is on, none of the control buttons
will respond. Pressing any button will show the display “LOC 1”. To engage lock 1, use the
up/down button to turn the lock on or off. To disengage, you must reenter the “set up” mode, go
to lock 1 and turn it “off”.
Lock 2:
Lock 2 only allows use of the “On/Off” button. The sauna can be turned on, but time and
temperature cannot be changed. Lock 2 is generally intended for use with public saunas where
management want public access limited to turning on the sauna. Pressing any buttons other than
“On/Off” will show the display “LOC 2”. To engage lock 2, use the up/down button to turn the lock
on or off. To disengage, you must reenter the “set up” mode, go to lock 2 and turn it “off”.
Lock 3:
No current function.
Lock 4:
No current function.
Diagnostic & Troubleshooting
The diagnostic that follows is only to determine if control is working properly. For troubleshooting of
heater itself, see notes in Heater Manual.
Meaning of Indicator diodes on main board:
L6 = unit has power
L4 = communication is OK between keypad and main control
L1, L2 = relays on, calling for heater
L3 = test button has been pushed, heating in bypass mode for 5 minutes, control counts down from 5 minutes
L5 = error code
Sensor Open: L5 off seconds, on 1 second, sensor open (keypad reads Sen O):
This may indicate sensor wire connection is loose or not connected properly inside keypad. Or
sensor bulb may have been pulled off.
Sensor Short: L5 on 2 seconds, off 1 second, senor short (keypad reads Sen S):
This may indicate sensor wire or sensor is damaged and is causing short.
Test Button: Test button on main board is useful to determine if problem is sauna heater or control. Use test
button If control appears to operated properly, but there no heat from heater, press test button.
This effective by-passes controls and heater will run for 5 minute test cycle. If heater does not
work, probable cause is that heater “hi-limit” has tripped. See Heater Manual Troubleshooting
page for hi-limit issues
CAUTION:
Main circuit board has high voltage. Use non conductive material
(i.e. pencil) to push test button
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