Thermo Scientific 3403 User manual

Midi 40 CO2 Incubator
Models 3403 and 3404
Service Manual 7993403 Rev. 2
_________________________________________________________________________________
Part of Thermo Scientific

Thermo Scientific
Manual Number 7993403
2 28728 6/18/12 Added full CO2 calibration procedure - Section 7 ccs
1 27807 10/3/11 Updated with op manual revisions ccs
0 -- 12/10/09 Original, was 97665H08 ccs
REV ECR/ECN DATE DESCRIPTION By
Preface
Midi 40 CO2 Incubator i

Thermo Scientificii Midi 40 CO2 Incubator
Preface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this
manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to
the use of this manual.
Progressive product changes will be entered into the service manual as it is revised. The manual is intended as an
aid to persons qualified in the service of applicable equipment. It is not intended to teach unqualified persons
on applicable equipment all procedures necessary to make repairs.
©2009 Thermo Fisher Scientific. All rights reserved.

Thermo Scientific Midi 40 CO2 Incubator iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be
damaged by elevated temperatures.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Fisher
Scientific has contracted with one or more recycling/disposal companies in each EU Member State
European Country, and this product should be disposed of or recycled through them. Further
information on Thermo’s compliance with this directive, the recyclers in your country and
information on Thermo products will be available at www.thermo.com.
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv Midi 40 CO2 Incubator
Preface
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Midi 40 CO2 Incubator vThermo Scientific
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Included Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Wiring Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
CO2 Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model and Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Cabinet Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Microprocessor Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Alarm Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Control Systems Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Door Heat System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Overtemperature Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . .4-1
CO2 Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Temperature Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Preventive Maintenance and Diagnostics . . . . . . . . . . . . . . . . . . . . . . .5-1
Recommended Tool List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Troubleshooting Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
Section 1
Section 2
Section 3
Section 4
Section 5

vi Midi 40 CO2 Incubator Thermo Scientific
Maintenance & Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Replacing the Gas Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Replacing the Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Replacing CO2 Sensor and Interface PCB . . . . . . . . . . . . . . . . . . . . .6-3
Replacing Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Testing the Outer Door Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Replacing the Outer Door Heater . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Replacing CO2 Solenoid Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Access Program or Service Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Temperature Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
CO2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Appendices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
IntrLogic Power/Key On Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
IntrLogic Test Points and Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Common Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
How to Enter Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
IntrLogic: Board Test Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Telemetry Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5
Detailed Descriptions of IntrLogic PCBs . . . . . . . . . . . . . . . . . . . . .8-10
Relay and Triac Allocation on Power PCB . . . . . . . . . . . . . . . . . .8-11
General Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Interface PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-20
CO2 Sensor PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-24
Electrical Schematic and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2
Table of Contents
Section 6
Section 8
Section 7
Section 9

Midi 40 CO2 Incubator 1-1Thermo Scientific
Section 1 General Information
The purpose of this manual is to provide procedures developed to assist
the field refrigeration technician in troubleshooting and repairing certain
conditions.
The incubators described in this manual are classified for use as stationary
equipment in a Pollution Degree 2 and Overvoltage Category II
environment, according to the UL3101-1 and IEC 664 standards.
These units are designed to operate under the following environmental
conditions:
• Indoor use
• Altitude up to 2000m
• Maximum relative humidity 80% for temperatures up to 31°C
• Main supply voltage fluctuations not to exceed 10% of the nominal
voltage.
Symphony incubators are designed to create a stable, reliable environment
for cell culture applications. They operate at temperatures ranging from
5°C above ambient temperature to +40°C, accurate to ±0.2°C. The gas
system controls within ±0.1% of measurable setpoint.
Each chamber consists of two sections: the cabinet (where the product is
stored) and the control section (containing the temperature, CO2, and
humidity control systems). On single-chamber models, the control section
is to the side of the cabinet.
Table 1: Typical Dimensions
Height Width Front to Back
18 in. 23.5 in. 18.5 in.
46.7 cm 59.7 cm 47 cm

1-2 Midi 40 CO2 Incubator Thermo Scientific
Section 1
General Information
Locate the unit in a level area free from vibration with a minimum of
three inches (7.6 cm) of space on the sides and rear and 12 inches (30.5
cm) at the top. The table must be able to support 40 PSI. Also, allow
enough clearance so that the door can swing open at least 90 degrees, and
the power cord can easily be reached to disconnect power. Do not
position the equipment in direct sunlight or near any HVAC
duct/diffusers. The ambient temperature range at the location must be
59°F to 90°F (15° to 32°C).
The following items are packaged and shipped inside the incubator
cabinet:
• The operating manual
• Shelves and shelf brackets
• 1/4 in. (476 mm) ID clear tubing for the gas connection
• Cordset
• 5” round humidity pan
• Additional CO2sensor gasket
•CO
2disposable filter 99.97
Location
Included Parts
Figure 4-1. Included Components (shelves and brackets not shown)
Cordset
Additional
gasket
Humidity
pan
Tubing
Filter
Operating
manual

Midi 40 CO2 Incubator 1-3Thermo Scientific
Section 1
General Information
Verify that the incubator gas supply is available near the installation area.
The required gas supply pressure is 15 PSI, controlled by a high-quality,
two-stage regulator suitable for the connected input gas.
Do not connect the gas at this time.
Caution Connect the equipment to the correct power source. Be sure to
operate the incubator at the voltage specified on the dataplate. Incorrect
voltage can result in severe damage to the equipment. s
Warning Failure to properly ground the equipment may cause personal
injury or damage to the equipment. s
Caution Always conform to National Electrical Code and local codes. s
Warning Do not connect the unit to overloaded power lines. s
The incubators described in this manual are rated for supply voltage
115/120VAC, single-phase, 60Hz, 3 amps.
Always connect the unit to a dedicated (separate) circuit. Do not exceed
the electrical and temperature ratings printed on the data plate. Electrical
codes require fuse or circuit breaker protection for branch circuit
conductors.
Model numbers are important because they identify the unit for service
capability. The serial number is a unique number that identifies the unit
as a specific unit. No other unit has that same number.
The model and serial numbers of your incubator are printed on a plastic
identification plate, commonly referred to as the data plate. The most
important information concerning your unit can be gathered from the
model number and the serial number identification. Additional
information is available on the data plate; such as the voltage, frequency,
and current ratings.
The data plate is mounted on the outside of the cabinet, beside the upper
door hinge. Some older models may have the plate mounted on the front
of the frame, just above the lower door hinge.
Model and Serial
Number
CO2 Gas Supply
Wiring Cautions

1-4 Midi 40 CO2 Incubator Thermo Scientific
Section 1
General Information
Component Locations
humidity pan
Upper back
of unit
Inside
Chamber
Lower back
of unit
Power
inlet
AS-485 Ports
Sample Port
CO2 inlet
sensor
dataplate
on left side

Midi 40 CO2 Incubator 2-1Thermo Scientific
Section 2 Safety
Incubators are complex equipment. Any attempt to repair a incubator
should be done with caution. There can never be too much said or written
concerning safety in any area of work, especially when dealing with
electricity. Safety should be everyone’s concern and responsibility. Personal
safety begins with knowledge of the equipment being worked on. Listed
below are a few ideas and reminders of safety concerns while working on
incubators.
In this manual and on labels attached to this product, the words Note and
Caution mean the following:
•Note May indicate information that may particularly useful, yet not
obvious to someone who is unfamiliar with this particular model.
•Note May indicate a situation which could result in failure of the
system to function properly unless detailed attention is given to the
procedure.
•Caution A potentially hazardous situation exists, which may result in
personnel injury or damage to the equipment. Before installing, using
or maintaining this product, please be sure to read this manual and
product warning labels carefully. Failure to follow these instructions
may cause this product to malfunction, which could result in injury or
damage.
Below are important safety precautions that apply to this product:
• Caution When replacing any component, ensure any green ground
wires are reconnected securely in their original positions to avoid
danger of shock or short circuit.
•Caution Never interfere with or bypass the operation of any switch,
component or feature of the unit. Interlocks, relays, and switches are
designed with a specific purpose and should, therefore, not be altered.
•Caution The user is responsible for carrying out appropriate
decontamination procedures when hazardous materials are spilled on or
inside the incubator.
Electrical Safety

2-2 Midi 40 CO2 Incubator Thermo Scientific
Section 2
Safety
Electrical Safety
(continued)
•Caution Be careful when handling access panels, parts, or any
components which may have sharp edges which may cause damage to
wiring and electrical connections, or personnel injury.
•Caution Warranty will not be responsible for damage caused by failure
to disconnect the unit from all power sources before cleaning,
troubleshooting, or performing other maintenance on the product or
its controls. To disconnect power supply to the incubator, unplug the
supply cord at the back of the incubator. Note that turning the key
switch on the front control panel to the Off position is not sufficient to
disconnect power.
•Caution Do not modify system components, especially the controller.
Use OEM exact replacement equipment or parts.
Before use, confirm that the product has not been altered in any way.
•Caution Use only approved replacement parts that are the correct size,
rating, and capacity as the original part.
•Caution Never interfere with or bypass the operation of any switch,
component or feature of the unit.
•Caution Before reconnecting the power supply, ensure all uninsulated
wires or terminals are not touching the cabinet
•Caution Warranty will not be responsible for damage caused by altering
a power cord in order to make it fit an electrical outlet. The line cord
must be plugged into a grounded, three-prong receptacle. Never cut or
remove the third (ground) prong from the power cord connector.
•Caution Never substitute ordinary wire for any internal wiring. The
internal wiring of these units carry a special rating due to the somewhat
high currents that they can be subjected to at times. This heavy current
load generates heat, which can melt ordinary wire. It is vitally
important that all connections are tight and secure.
•Caution To avoid electrical shock, fire, and equipment damage, ensure
that any wires or terminals touching the cabinet are insulated before
connecting the power supply. Electrical wiring and all grounds must be
correctly reconnected and secured away from sharp edges, components
and moving parts. All panels and covers should be reinstalled before the
incubator is plugged in.

Midi 40 CO2 Incubator 2-3Thermo Scientific
Section 2
Safety
Electrical Safety
(continued)
•Caution Warranty will not be responsible for damage caused by the use
of steel wool, chlorinated products, corrosive agents, formaldehyde,
concentrated mineral acids, high pressure steam at over 100°C, benzyl
alcohol, Methylene Chloride or other caustic agents.
•Caution Warranty will not be responsible for damage caused by
disconnecting components with the power cord still plugged into the
wall outlet.
•Caution Warranty will not be responsible for damage caused by using
an improper gas supply, such as a liquid CO2 cylinder with a siphon
tube.
•Caution Warranty will not be responsible for damage caused by
touching gas sensors.
•Caution Warranty will not be responsible for damage caused by the use
of de-ionized water in the humidity pan.
•Caution Warranty will not be responsible for damage caused by gas
input pressures exceeding 15 PSIG at the rear of the cabinet.
•Caution Remote alarm contacts are rated for a maximum of 3A (amps)
at 125VAC.
•Note Use this product only in the way described in the product
literature and in this manual. Before using it, verify that this product is
suitable for its intended use.
•Note Know the location of the incubator’s circuit breakers or fuses.
Ensure all breakers and/or fuses are clearly marked for quick
identification and reference.
•Note Always use the correct tool for a job and be sure those tools are
in good condition. Ensure that tools to be used on electrical devices are
well insulated, if applicable.
•Note Be sure to reference any applicable wiring diagram(s) when
reconnecting and replacing electrical components.
•Note Throughout this service manual, additional safety precautions
dealing with specific procedures may be presented. This information
should be carefully read and observed.

Midi 40 CO2 Incubator 3-1Thermo Scientific
Section 3 Technical Information
This section contains information concerning the unit upon which
maintenance is being performed. All numbers given are general in nature
and may differ slightly for a particular unit.
Upon start-up, time must be allowed for the interior temperature to
stabilize before any adjustments or permanent calibrations are made.
• Alarms:
High and low level CO2 setpoint alarms, adjustable to within ±1% of
setpoint.
High and low temperature alarms settable by the user.
• Advanced microprocessor controls with large, easy-to-read display. On
program request, software steps the user through initial installation and
startup procedures.
• Keyed power/alarm switch provides setpoint security.
• Tamper-resistant touchpad data entry with adjustable operating tempera-
ture
• Key operated switch for main power and alarm system.
• Extra large digital temperature display, with a resolution to 0.1°C and
0.1% CO2/RH.
• On-board AC power monitoring with digital read-out of actual line volt-
age.
• 2” fiberglass insulation
• All-steel cabinet with high-impact epoxy finish for easy cleaning
• Adjustable stainless steel interior shelves
• All the unit exteriors are constructed of painted, cold roll steel.
• One glass inner door with positive latch
Features and Benefits
Microprocessor
Control Systems
Cabinet Construction

3-2 Midi 40 CO2 Incubator Thermo Scientific
Section 3
Technical Information
Requirements • A high quality two-stage, low-pressure 30 PSIG pressure regulator is
required for proper operation of the CO2 gas supply, 15 PSIG at the
incubator.
• CO2 used in the incubator must be at least 99.9% pure.
• Direction-sensitive in-line gas supply filters must be used on the CO2
supply to prevent damage to the solenoid valve. One filter is supplied
with the start-up kit:
Type: Microbiological
Specification: 0.3 micron
Location: rear of unit
• Built-in safety alarm system with automatic continuous-charge battery
back-up.
• Automatic Incident Monitor to advise the user of alarms that may have
occurred and cleared while the unit was unattended.
• Low battery indicator
• Touchpad alarm test
• Power failure or temperature deviation outside alarm set limits triggers
audible and visual warning.
• Independent high and low alarm setpoints adjustable in 0.1 increments
• RS485 connections for remote monitoring
Alarm Monitoring
System

Midi 40 CO2 Incubator 4-1Thermo Scientific
Section 4 Control Systems Theory
The various control systems theory of operation is described below.
Laboratory CO2 Incubators have a “jacket” between the incubator
chamber and the exterior wall of the unit. This “jacket” is filled with
fiberglass insulation to enhance chamber temperature stability while
reducing energy costs.
A temperature sensor located in the chamber air provides a reference point
for a closed-loop temperature control system.
A CO2 sensor constantly detects the level of CO2 in the chamber, and
compares the reading with the CO2 setpoint. If the measurement is low,
then the CO2 solenoid opens and allows CO2 to be injected until the
concentration is within 0.1% of setpoint.
The alarm system constantly monitors the difference between Setpoint and
Measured values, and sounds an alarm if the difference is greater than
0.1% above or below setpoint. To prevent false alarms that would
otherwise be caused by opening the door, the Low CO2 alarm has a built-
in delay of fifteen (15) minutes so that the chamber can stabilize CO2
levels after the door has been opened.
This system is activated anytime the chamber air sensor detects a
temperature above the overtemperature setpoint, which should be set no
closer than 0.3°C above the chamber temperature. When the system is
activated, the jacket heater is turned off, and both audible and visual
alarms are activated. The overtemperature sensor is the chamber air sensor
that also provides the signal for the digital display on the control panel.
Heating the inner surface of the outer door with a low wattage, large area
heater provides enough radiant heat to the glass door to control
condensation. The microprocessor controls the door heater.
Temperature Control
System
CO2 Control Systems
Overtemperature
Monitoring System
Door Heat System

Midi 40 CO2 Incubator 5-1Thermo Scientific
Section 5 Preventive Maintenance and
Diagnostics
Preventive maintenance is the best way to ensure that the unit you own or
service continues to operate at its optimum level. The following
instructions will assist in your preventive maintenance program.
• Cabinet leveling - Check the cabinet to ensure that it is level. Check
from the front to the back and then side to side, check the level on a (6)
month schedule.
• Cabinet clearance - Locate the unit in a level area free from vibration
with a minimum of three inches (7.6 cm) of space on the sides and rear
and 12 inches (30.5 cm) at the top. The table must be able to support
40 PSI. Also, allow enough clearance so that the door can swing open at
least 90°, and so that the power cord can easily be reached to disconnect
power.
• Voltage requirements - Check the voltage requirements every three to six
months. Verify that the source voltage is within +10% and -5% of the
rated data plate voltage.
• Gasket maintenance - Periodically check the gaskets around the door for
punctures or tears. Gasket leaks are indicated by an excessive gas con-
sumption and/or condensation.
Keep the gaskets clean by wiping gently with a soft cloth.
To check gaskets for proper sealing, ensure that the cabinet is level. Then
use a 2” x 6” piece of paper closed between the gasket and the door at 2”
intervals around the perimeter. At each position, pull on the free end of
the paper; a slight resistance should be felt. While performing this test,
inspect the gasket for cuts or tears. An improperly sealing gasket must be
replaced.
• Center Air Temperature Validation - Check the center air temperature
using a thermocouple located physically in the geometric center of the
cabinet (centered from top-to-bottom, and centered from left-to-right)
versus the control panel electronic display. The temperature should
match the display within ±0.1°C.
• Electrical wires - Check the electrical control box for any burnt or discol-
ored wires due to lose connections or low voltage conditions.
1. Maintenance should only be performed by trained personnel.

5-2 Midi 40 CO2 Incubator Thermo Scientific
Section 5
PMs & Diagnostics
One of the keys to doing a job correctly is using proper tools. The
following list is NOT all inclusive of the tools that may be needed to
perform the procedures listed in this manual. However, these tools will be
needed to perform many of the steps in these procedures.
• Electronic Digital Thermometer (reads ±0.1°C)
• Digital Voltmeter, 4-1/2 digit
• Cordless Screwdriver (reversible)
• Ammeter (4mA – 5A, digital)
• CO2 Gas Analyzer
• Phillips Screwdrivers
Recommended Tool
List

Midi 40 CO2 Incubator 5-3Thermo Scientific
Section 5
PMs & Diagnostics
Date of Record:
Model #: Serial #:
Prior Setpoints –
Time at prior Setpoints –
Correct Temperature compared to Setpoint –
Room Temp Changes –
View and record each display:
Current display of temperature “Temp (C)” = ___________
Current display of CO2 “CO2 (%)” = ________________
Press the ‘mode’ and ‘up’ buttons together =
“Ambient Temp” ____________
Press the ‘down’ button = “LOW Temperature” _____________
Press the ‘up’ button = “HIGH Temperature” _____________
Reset the excursions by pressing the ‘up’ and ‘down’ buttons together. Press
and HOLD the ‘mode’ button until display changes to “Program Mode” then
release ‘mode’ button.
Display = “Set Temp SETPOINT” ___________
Press ‘mode’ button = “Set Temp WARM Alarm” _________
Press ‘mode’ button = “Set Temp COLD Alarm” _________
Press ‘mode’ button = “Set CO2 SETPOINT” _________
Press ‘mode’ button = “Set CO2 HIGH Alarm” _________
Press ‘mode’ button = “Set CO2 LOW Alarm” _________
Press ‘mode’ button = “Set Temp OFFSET” _________ (Actual) and ________
(Offset)
Press ‘mode’ button = “Set CO2 OFFSET” _________ (Actual) and _________
(Offset)
Troubleshooting
Parameter List