Carlin EZ-Temp 90320 User manual

with Sensor Redundancy
Data sheet
126 Bailey Road North Haven, CT 06473
Phone [phone] Fax [phone]
Carlin Combustion Technology
Tech support 800-989-2275 carlincombustion.com
©Copyright 2021 – Carlin Combustion Technology
Specifications
• Carlin’s Model 90320 microprocessor-operated, multiple-contact tem-
perature limit controls are available as described below. The model
provides two contacts — one for operating limit and one for high limit.
• Refer to separate product listing sheets for pre-defined models, or re-
quest a control to meet your specifications, within the available ranges
listed below.
90320B
Dual limit temperature control
• operating and high limit action
• smart manual reset on high limit
• operating limit sensors, redundant
• high limit sensor
• operating and limit contacts in series
Control model B
Control power input (red-white wire) 240 VAC, 50/60 hz, 12 VA
Contacts 2 in series
Contact rating Motor load
General
240 VAC, 50/60 hz, 1 HP
120/240 VAC, 50/60 hz, 15 AMPS
Wires Quantity 3
240 VAC Hot / Neutral red-white / white
Limits OUT black
Adjustable oper. limit range Any range between 50°F to 240°F
Fixed high limit temperature Any value from 160°F to 240°F
Fixed differential (subtractive) Any value from 5°F to 100°F
Operating temperature limits +32°F to +140°F
Storage temperature limits–40°F to +185°F
Agencies—
mMultiple sensor option (3)
(Using individual and/or dual sensor assemblies)
mSensor Redundancy
(Higher temperature of two operating sensors used)
mEasy remote sense
(Electronic sensors, wired to control)
mSmart manual reset
(Manual reset only if operating limit doesn’t open)
mServiceman reset protection
(Latch-up after three consecutive lockouts (1))
mPower-independent lockout
(Power cycling won’t reset from lockout or latch-up)
mDiagnostic LED’s
(Call for heat, and lockout/latchup)
mSMC Technology (2)
(1) Latch-up mode shuts down the control after three consecutive lockouts, and requires a
special procedure to reset. This ensures the owner will call in a licensed technician to
troubleshoot and correct burner problems.
(2) The 90320 provides two limit relays. Carlin’s patented SMC technology (Safety Monitoring
Circuit) monitors the contacts of both relays. Lockout occurs if a limit relay contact is found
closed when it should be open.

Model 90320 Microprocessor Temperature Controls — Data sheet
Model 90320
Diagnostic LED’s
Button Press Instructions
R A
R A
125
R
A
125
R
A
125
RA
E0 1
RA
E0 1
RA
E0 1
Power Off
Power On
No Call for Heat
Call for Heat
Lockout
Latchup, red flashes
every 2 seconds
Primary Relay
Warning, red flashes
every 5 seconds
LEGEND Quickly press the UP or DOWN button to display water
temperature.
Press and hold UP and DOWN buttons for 5 seconds to enter
“Set Temperature” mode.
Press the UP or DOWN button to increase or decrease the “Set
Temperature”.
Do not press any buttons for 5 seconds to exit the “Set Tem-
perature” mode and save the new temperature.
Press and holde UP and DOWN buttons during power up to
enter “Diagnostic Mode” mode.
Press the DOWN button to move to the next error recorded in
the 16 deep error log. When you see an “E – –” displayed, you
have reached the end of the log. If you press the DOWN button
again, you will cycle back to the beginning of the log.
Press and hold RESET for 3 seconds to clear all recorded logs.
Press and hold RESET for 5 seconds to exit Lockout.
Press and hold RESET for 30 seconds to exit Latchup.
Display Mode
Set Temp Mode
(Set Temp =
The target
temperature
of the appliance)
Diagnostic Mode
Lockout Mode
Latchup Mode
Up Reset Down
Electrical shock hazard: Disconnect power to appliance when
wiring or servicing any electrical component.
Operation Modes
Power, Off – (No power is applied to the red-white wire)
• All lights and screen will be off.
Power, On – (Power applied to red-white wire)
• Screen will turn on and control will enter NORMAL OPERATION MODE
Self-test – When power is applied, the 90320 performs a self-test, checking
sensor(s) and microprocessor and verifying limit contacts are open. The
power-up test lasts from 3 to 5 seconds. The 90320 continues diagnos-
tic checking during the operating cycle as well. Any self-check failure
causes a lockout (see below).
Call for Heat – When the temperature at the operating sensor is at or below
setpoint minus fixed differential, the control closes the operating relay
contacts.
Stand By – When operating sensor reaches setpoint temperature or above,
temp control will open the operating relay contacts.
Normal Operation (Mode) – (Initial starting mode)
• The EZ-Temp will display the User Set Temperature.
Display – (How to enter = Pressing UP or DOWN key in NORMAL MODE)
• In DISPLAY MODE, the EZ-Temp will display water temperature read-
ing for 5 seconds, then return to NORMAL OPERATION (Temperature
Set Point).
Setting – (How to enter = Hold up and down buttons for 3 seconds while in
NORMAL OPERATION)
• In SETTING MODE, the user is able to adjust the operating limit (via
setting the set temperature). Once in this mode, the display will begin
flashing the current set temperature. The display will increase one
degree per UP or DOWN button push or 10 degrees per second when
the button is held.
Diagnostic – (How to enter = Power up the system with the UP and DOWN
buttons depressed. Once buttons are released, the system will move
into diagnostic mode)
• DIAGNOSTIC MODE displays recorded error codes. When powered in
this mode, the display will show the newest recorded error code. As
the DOWN key is pressed, the system will display error codes from
newest to the oldest. When there are no more codes to display, the
EZ-Temp will show a “E_ _” to indicate end of error codes. If the user
continues to push the down button, the system will go back to the
newest error code and begin displaying the error codes again from
newest to oldest. The only way to exit this mode is to power cycle the
system. To clear error codes (while in diagnostic mode), push and hold
reset button for 3 seconds. To clear error codes (while in diagnostic
mode), push and hold RESET button for 3 seconds.
High Limit Test – (How to enter = In NORMAL OPERATION, hold RESET, UP
and DOWN buttons for 3 seconds)
• During this operation, EZ-Temp will display a flashing 240 (high
temperature setting). Pressing the DOWN button temporarily adjusts
the high limit set point. The setting will decrease one degree for each
press of the DOWN button or hold the button for faster decrease. If the
DOWN button is not pressed for a period of 10 seconds, the unit will
return to normal operation. When the high limit set point is lower than
the actual temperature, the unit goes into hard lockout and displays
the error code E05. Holding the RESET for 3 seconds clears the
lockout and returns the high limit setting to the default (240°). If the
lockout condition has driven the unit into latchup, the RESET must be
held for 30 seconds.
Soft Lockout – (When any temperature sensor goes out of range or the
system has detected a high temp condition and the operating relay
contacts are open)
• When in this state, it will display error code or “HL” but will leave the
lockout LED off. If the condition that caused the soft lockout clears, the
system will return to normal operation.
Lockout – (Numerous Error Codes)
• The EZ-Temp will enter this state when an unsafe condition has oc-
curred and the user must manually reset the system. Lockout can be
cleared by pressing the RESET button for 3 seconds.
Latchup – (Occurs after 3 LOCKOUTs have been detected during any
one call for heat)
• The system will enter a safe mode and will not exit the mode without
user intervention. You can exit latchup mode by depressing the RESET
button for thirty seconds. By exiting this way, the system will reset the
lockout count back to zero.

Model 90320 Microprocessor Temperature Controls — Data sheet
Mounting – 90320 controls mount to any standard well. Mount the
90320 directly to a well (new or existing) with hardware sup-
plied in the separate well mounting kit.
Well Kits – Wells for 90320 sensors are available in the sizes shown
below. Well kits include sensor mounting hardware designed to
hold sensor securely in position.
Sensors – Sensors are available separately for the 90320.
Configurations
3"
43/8"
43/4"
Error Codes
Error Code Reason
01 Primary (K2) relay is welded on. Note: If the control is reset
from error code 01, the red LED will flash every 5 seconds
indicating the control must be replaced.
02 Primary & Safety relays (K1 and K2) on. The control cannot
be reset from error code 02 and must be replaced.
03
Primary & Safety relays (K1 and K2) are off. Note: If this
error is detected, the control will show error code 03 and
enter soft lockout two times to try and resolve the issue. If
the problem persists the control will enter hard lockout.
05 Simulated High Temp lockout. Push the RESET button.
06 Temp is above set high temp but below thermistor high
(250°F). This is a common occurrence once the burner
turns off.
Error Code Reason
20 Temp sensor 1 out of range failure. Replace sensor 1.
21 Temp sensor 2 out of range failure. Push the RESET button.
22 High limit temp sensor out of range failure. Replace the
high temp sensor.
23 Temp sensor 1 pin is open. Replace sensor 1.
24 Temp sensor 2 pin is open. Replace sensor 2.
25 High limit temp sensor is open. Replace the high temp
sensor.
10,11,12,13,14,15 Internal hardware safety failure – unit should be replaced. Contact customer service for additional informa-
tion. 1-800-989-2275

Model 90320 Microprocessor Temperature Controls — Data sheet
MN90320B 080221
G
Service
switch
Appliance limits
90320B
Black
Red/White
White
O
PERATING LIMT
H
IGHLIMIT
Dual limit OUT
240 VAC, 50/60
HZ
POWERTOAPPLIANC
E
G
240 VAC, 50/60 HZ
CONNECTIONS AT APPLIANCE
To operating limit sensor
1
To operating limit sensor
To high limit sensor
2