Thermo Scientific Precision 818 Operating instructions

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User Manual
Thermo Scientific Precision
Model 818 Incubator
Plant Growth Chamber - Microprocessor Controlled
Operating and Maintenance Manual 7013758 Rev. 1

Thermo Scientific
Manual Number 7013758
1 40905 6/8/17 Added Chinese info bpg
0 40096 4/3/15 Original - new cabinet size, technical data ccs
ev EC /ECN Date Description By
Preface
Plant Growth Chamber i
Catalog Number (Model) Volume
(L /cu. ft.) Voltage
PR505755L (3759) 504/17.8 120V
PR505750L (3758) 504/17.8 230V
PR505750L-CN 504/17.8 230V
Covered in this manual:

Thermo Scientificii Plant Growth Chamber
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
Warning If the growth chamber is not used in the manner specified in this operating manual, the protection
provided by the equipment design may be impaired. s
Warning Hot/warm surface(s) can occur. epending on ambient termperature and settings, surface can become
warm (up to 60°C). 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.
©2015 Thermo Fisher Scientific. All rights reserved.
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION

Thermo Scientific Plant Growth Chamber 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.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the irective 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) irective 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 Scientific products will be available at www.thermoscientific.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 Plant Growth Chamber Thermo Scientific
Preface
Do You Need Information or Assistance on
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If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
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When more extensive service is necessary, we will assist you with direct factory trained
technicians or a qualified service organization for on-the-spot repair. If your service need is
covered by the warranty, we will arrange for the unit to be repaired at our expense and to your
satisfaction.
Regardless of your needs, our professional telephone technicians are available to assist you
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401 Millcreek Road, Box 649
Marietta, OH 45750
International customers, please contact your local Thermo Scientific distributor.

Thermo Scientific Plant Growth Chamber v
Thermo Scientific
Preface
Warranty Notes
Information You Should Know Before Requesting Warranty Service
•Locate the model and serial numbers. A serial tag is located on the unit itself.
• For equipment service or maintenance, or with technical or special application inquiries, contact Technical
Services at 1-800-438-4851 or 1-740-373-4763 (USA and Canada). Outside the USA, contact your local
distributor.
Repairs NOT Covered Under Warranty
• Calibration of control parameters. Nominal calibrations are performed at the factory; typically ±1°C for
temperature, ±1% for gases, and ±5% for humidity. Our service personnel can provide precise calibrations as
a billable service at your location. Calibration after a warranty repair is covered under the warranty.
• Damage resulting from use of improper quality water, chemicals or cleaning agents detrimental to
equipment materials.
• Service calls for improper installation or operating instructions. Corrections to any of the following
are billable services:
1) electrical service connection
2) tubing connections
3) gas regulators
4) gas tanks
5) unit leveling
6) room ventilation
7) adverse ambient temperature fluctuations
8) any repair external to the unit
• Damage resulting from accident, alteration, misuse, abuse, fire, flood, acts of God, or improper
installation.
• Repairs to parts or systems resulting from unauthorized unit modifications.
• Any labor costs other than that specified during the parts and labor warranty period, which may
include additional warranty on CO2sensors, blower motors, water jackets, etc.

Section 4
Section 5
Section 6
Section 8
Section 7
Plant Growth Chamber viThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Unpacking and amage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Performance ata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Explanation of Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Explanation of Auxiliary Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Instrumentation Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Operation and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
To Lock the Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
To Unlock the Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Adjusting the Intake and Exhaust Ports . . . . . . . . . . . . . . . . . . . . . . 3-10
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Symptoms and Possible Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Possible Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
General Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
RS232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Setting Up the Incubator for Communication . . . . . . . . . . . . . . . . 6-2
Setting up the Computer for Communication . . . . . . . . . . . . . . . . 6-5
Using the Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Section 1
Section 2
Section 3

Plant Growth Chamber 1-1Thermo Scientific
Section 1 Introduction
Your satisfaction and safety are important to Thermo and a complete
understanding of this unit is necessary to attain these objectives.
Warning As a routine laboratory precaution, always wear safety glasses
when working with this apparatus. s
This product is not intended, nor can it be used, as a sterile or patient
connected device. In addition, this apparatus is not designed for use in
Class I, II or III locations as defined by the National Electrical Code.
Save all packing material until unit is put into service. This merchandise
was carefully packed and thoroughly inspected before leaving our factory.
Responsibility for safe delivery was assumed by the carrier upon acceptance
of the shipment; therefore, claims for loss or damage sustained in transit
must be made upon the carrier by the recipient as follows:
1. Visible Loss or amage: Note any external evidence of loss or damage
on the freight bill, or express receipt, and have it signed by the carrier's
agent. Failure to adequately describe such external evidence of loss or
damage may result in the carrier's refusing to honor your damage
claim. The form required to file such claim will be supplied by the
carrier.
2. Concealed Loss or amage: Concealed loss or damage means loss or
damage which does not become apparent until the merchandise has
been unpacked and inspected. Should either occur, make a written
request for inspection by carrier's agent within fifteen (15) days of the
delivery date; then file a claim with the carrier since the damage is the
carrier's responsibility.
If you follow the above instructions carefully, we will guarantee our full
support of your claim to be compensated for loss or concealed damage.
Note o not - for any reason - return this unit without first obtaining
authorization. In any correspondence to Thermo, please supply the
nameplate data, including catalog number and serial number. s
Unpacking and
Damage

1-2 Plant Growth Chamber Thermo Scientific
Section 1
Introduction
The growth chamber has been commonly referred to as the standard
model 818.
The PR505750L can be converted for operation on 200V or 240V by
changing the input connections to the autotransformers (see wiring
diagram at the end of this manual).
The PR505750L/PR505755L Plant Growth Chamber has been designed
to provide the ultimate in temperature control. The user is assured of
dependable and precise performance through the use of microprocessor
technology in the temperature control circuitry. This growth chamber is
operable in the range of -10° to 50°C without illumination, and +10°C to
+50°C with illumination. These temperature ranges will meet a wide
variety of applications, such as BO determination, general incubation,
as well as the preservation of critical materials.
*with d r illuminati n switch n
General Information
Performance Data
Set
temperature
Uniformity values:
Temperature deviation
from set value, spatial
(3 point measurement)
Uniformity values:
Temperature deviation
from set value, spatial
(27 point measurement
according to DIN 12880)
Temperature stability:
Maximum temperature
difference at chamber
center point (1 point
measurement)
Energy
consumption
Heat up time / Cool
down time from
ambient temperature
according to DIN
12880
Recovery time
after door open-
ing according to
DIN 12880
-10°C ±0.8°C ±1.3°C ≤ ±0.25°C ≤ 0.3 kW ca. 80 min ca. 10 min
+10°C ±0.6°C / ±0.2°C ±1.9°C / ±1.3°C ≤ ±0.25°C ≤ 0.54 kW /
≤ 0.52 kW ca. 54 min.* ca. 4 min.
+20°C ±0.5°C / ±0.2°C ±1.8°C / ±0.9°C ≤ ±0.20°C ≤ 0.55 kW /
≤ 0.49 kW N/A N/A
+50°C ±0.25°C / ±0.15°C ±1.1°C / ±0.9°C ≤ ±0.15°C ≤ 0.56 kW /
≤ 0.51 kW ca. 100 min. * ca. 42 min. *
Note The above performance figures are based upon the following operating conditions:
- Ambient temperature of 22°C, ±3°C
- Line voltage 120V, ±5% (120V version) and 230V, ±5V (230V version)
The following test protocols have been used:
3 point measurement test: 1 thermocouple sensor in center of each shelf - 1 shelf top position, 1 shelf lowest
position, 1 shelf middle position
27 point measurement test: 9 x thermocouples on each shelf - 1 shelf top position, 1 shelf lowest position, 1
shelf middle position (based on IN 12880)
1 point measurement test: 1 thermocouple at chamber center point (temporal temperature variation
characterized by the maximum temperature difference)

The refrigeration system, defrost heater, and air circulating fan are used in
conjunction with a microprocessor controlled proportioning circuit to
achieve sensitive temperature control. An RT (Resistance Temperature
etector) located in the airstream senses any temperature deviation from
the control point, and heat is provided proportionally to maintain the
desired temperature. Regardless of what temperature is being maintained,
the compressor operates continuously. This constant operation alleviates
component failures associated with cycle type operation.
The circulating fan provides even air distribution throughout the chamber
and ensures temperature uniformity.
The program mode of PR505750L/PR505755L plant growth chamber
allows the user to program into memory 2 sets of values for time, setpoint
temperature, and light condition per day for a full week. The following is
an example of a schedule and a pictorial describing the events during that
week. A blank schedule sheet is provided toward the end of the manual for
the user to copy, then document a schedule. It is strongly recommended to
do this before any programming is performed.
The growth chamber leaves the factory with a default schedule as follows:
Hr1 1am Hr2 1pm
Min1 00 Min2 00
Set1 20.0 Set2 20.0
LGT1 OFF LGT2 OFF
Plant Growth Chamber 1-3Thermo Scientific
Section 1
Introduction
Theory of Operation

1-4 Plant Growth Chamber Thermo Scientific
Section 1
Introduction
TUESDAY` 3AM0020.0 OFF 5PM0010.0 OFF
MONDAY 2AM0030.0 ON 4PM0020.0 ON
SUNDAY 1AM0020.0 OFF 3PM0040.0 ON
FRIDAY 2AM0010.0 ON 4PM0020.0 OFF
SAMPLE SCHEDULE SHEET
HOURS MINUTES SETPOINT LIGHT HOURS MINUTES SETPOINT LIGHT
AM/PM TEMPERATURE ON/OFF AM/PM TEMPERATURE ON/OFF
WEDNESDAY 4 AM 0010.0 ON 6 PM 0050.0 ON
THURSDAY 3AM 0050.0 OFF 5PM0040.0 ON
SATURDAY 1AM0020.0 ON 3PM0030.0 OFF

1) AM/ M Lamps - These two green indicator lamps inform the user as
to the12-hour time period of the day.
2) Time Display - This four-digit display indicates the time of day. In the
program mode, this display shows what parameter is being
programmed.
3) Day-of-the-Week Lamps - These seven green indicators show what day
it is.
4) Mode Lamps - These two indicators inform the user whether the
growth chamber is in a continuous mode of operation, or a program
mode of operation (timed sequence).
5) Temperature Display - This four-digit display indicates the growth
chamber chamber temperature. Also, during programming, it displays
the value prompted by the time display.
6) Heater On Lamp - This lamp is illuminated when power is applied to
the heater.
7) High/Low Temperature Lamps - These lamps will illuminate if the
growth chamber's chamber temperature exceeds the high or low limit
temperatures.
8) Locked Lamp - This lamp will illuminate if the user has locked the
keyboard to avoid accidental changing of parameters.
Plant Growth Chamber 1-5Thermo Scientific
Section 1
Introduction
3
4
567
1
2
89
10
11
12
13
14
15
16
18
17
19
Explanation of Front
Panel Controls

1-6 Plant Growth Chamber Thermo Scientific
Section 1
Installation and Start-Up
9) Light On/Off Lamps - These two lamps indicate the status of the
internal light (whether it is on or off) during operation.
10) Enter Key - This key is used after any setpoint selection is made to
enter the value into memory.
11) rogram Key - When the program mode is selected with the SET key,
the PROGRAM key will prompt the user to enter program values
starting with SUN AY.
A blank schedule sheet is provided toward the end of this manual so the
user can predetermine the weeks program. Use of the schedule sheet is
strongly recommended before any programming is started.
12) Set Key - This key has two functions. The first being to select the
continuous or program mode of operation. The second being to select
a setpoint temperature if the continuous mode of operation has been
selected.
13) Up/Down Arrow keys - These keys are used to increase or decrease a
desired value.
14) RE EAT KEY - This key is a time saver key. When in the program
mode, pressing this key will duplicate the program setting from the
current day to the other 6 days.
15) CAL KEY - This key is used to calibrate the growth chamber to a
certified/traceable thermometer.
16) Mute Key - This key is used to silence the internal audible alarm and
to also deactivate the external alarm device if one is being used.
17) Light Key - This key, in Continuous mode, will turn the internal light
on or off. In Program mode, this key is disabled. The internal light will
not be allowed to operate at a setpoint temperature below 10 degrees in
either the Continuous or Program mode.
18) Lock Key - This key is used to enable or disable the keyboard.
19) Clock Key - This key is used to select the day, hours, and minutes.
Explanation of Front
Panel Controls (cont.)

On the left side of the growth chamber control panel there is an auxiliary
panel which has the items shown in the figure on the next page. They are
described as follows:
1) Fuse - This fuse is in line with the main power cord that comes into
the growth chamber. The rating of this fuse is printed above the fuse
holder. The physical size of this fuse is 5mm x 20mm.
2) Alarm Relay - This Alarm Relay output is provided to the user for the
purpose of remotely monitoring the growth chamber in case of a high
or low temperature alarm condition. This alarm relay will operate just
as the audible alarm would. The contact itself is an isolated form C
(normally open/normally closed) dry contact. This contact is to be
used for low voltage class 2 connections only. The contact rating is 24
volts, 1.25 amps resistive. Typical usages of the output are shown
below.
In this configuration, the light will illuminate whenever the unit goes into
an alarm condition, High or Low.
In this configuration, the light will go off in a high or low temperature
alarm condition.
Note Wiring must conform to all local electrical codes. s
Plant Growth Chamber 1-7Thermo Scientific
Section 1
Installation and Start-Up
Explanation of Auxiliary
Panel

1-8 Plant Growth Chamber Thermo Scientific
Section 1
Installation and Start-Up
Instrumentation Port
3) RS-232 Output (Optional Kit /N 3166245) -This output is used for
two way communications between the growth chamber and a personal
computer. With the use of a communications/modem software
program, the user can record the temperature of the growth chamber at
their selected time periods and store it in a file for use with a
spreadsheet program. The user can also change the setpoint
temperature from their personal computer and periodically monitor the
actual temperature, setpoint temperature, and alarm status.
4) Recorder Output - This is a C millivolt output which represents the
temperature of the growth chamber. The recommended main use of
this is with a chart recorder having an input impedance of at least 1M
ohm. The scaled temperature output
change is 10mV°C. When the growth
chamber is operating at a negative
temperature, the chart recorder output
is still positive. Use the chart at right
to relate temperature to output voltage.
When connecting a chart recorder to
the recorder output connector, it is
recommended to use a shielded cable
with the shield grounded at the chart
recorder and to keep the cable short as
possible.
Located on the rear side of the growth chamber is an instrumentation port
for the user to insert sensor wires, external meter leads, etc. into the
chamber. The rubber plug provided must always be used in this port to
insure the uniformity specifications. An extra plug is supplied for the user's
convenience. Be sure to seal any gaps around the wire(s) going through the
plug.
Explanation of Auxiliary
Panel (continued)

Plant Growth Chamber 2-1Thermo Scientific
Section 2 Installation
Use the proper lifting equipment when moving this unit. The shipping
weight of this unit is 340 lbs. (154 kg).
To ensure proper ventilation, allow 4" minimum clearance between the
rear, top, and sides of the growth chamber and adjacent walls. If two or
more growth chambers are positioned side by side, allow a minimum of 8"
between cabinets. Adjust the front leveling feet of the growth chamber so
that the front is higher than the rear. This will assist in door closing.
Choose a site free from rapidly changing ambient temperature conditions.
Caution The growth chamber should not be operated in an environment
where the ambient temperature exceeds 90°F, as the compressor thermo-
overload will be tripped and will result in a wide band control cycle of
approximately ±4°C. Such cycling should not be misinterpreted as a
malfunction of the electronic controls. s
Radiators, air-conditioning outlets, other ventilating system outlets, and
drafts can affect the operation of the growth chamber by a sudden inrush
of air that is at a temperature different than operating conditions.
Warning For personal safety, this apparatus must be properly grounded. s
Wall mount brackets are attached to the top rear of the cabinet. Remove
any packaging materials from the brackets. Rotate the brackets so they
point straight out from the back. Secure bracket in place with the included
hardware. Attach brackets to wall.
The power cord is the mains disconnect. Make sure the outlet and plug are
accessible at all times.
Figure 2-1. Brackets During Shipping Figure 2-2. Brackets During Use

2-2 Plant Growth Chamber Thermo Scientific
Section 2
Calibration
The power cord of this instrument is equipped with a three-prong
(grounding) plug which mates with a standard three-prong (grounding)
wall receptacle to minimize the possibility of electric shock hazard from
this apparatus. The customer should have the wall receptacle and circuit
checked by a qualified electrician to make sure the receptacle is properly
grounded.
Where a two-prong wall receptacle is encountered, it is the personal
responsibility and obligation of the user to have it replaced with a properly
grounded three-prong wall receptacle.
Warning o not, under any circumstances, cut or remove third (ground)
prong from the power cord. o not use a two-prong adapter plug. s
etermine the total amount of current presently being used by other
apparatus connected to the circuit that will be used for this unit.
It is critical that the added current demand and other equipment on the
circuit not exceed the rating of the fuse or circuit breaker in use.
Caution Be sure the power supply is the same voltage as specified on the
nameplate. s
When loading the growth chamber, a space of 1/2" must be allowed
between adjacent items in the chamber. This will allow maximum air
circulation, necessary for proper temperature uniformity. The uniformity
will be adversely affected if air circulation is obstructed.
Liquid containers should never be placed in the growth chamber without
covers. The evaporation of moisture within the chamber will only add frost
and hasten the need for defrosting. This chamber is not self-defrosting.
Excessive frost buildup on the evaporator coil located on the lower back
wall will also affect temperature uniformity.
1. o not place any explosive,combustible, or flammable materials in the
chamber.
2. o not place sealed containers in the chamber. Sealed containers, filled
with material, do not provide room for expansion and can develop
dangerous vapor pressure as the temperature increases.
3. Avoid spillage of liquids within the chamber.
4. o not evaporate noxious fumes.
Caution o not store containers filled with acidic or caustic solutions, as
vapors from these materials will attack the evaporator and void the
Safety Precautions

Section 3 Operation and Calibration
In the "Explanation of Controls" section, all of the control panel keys were
discussed. In this section, some of those keys will be discussed in greater
detail due to their more involved operation.
1. Clock Key - Pressing the CLOCK key will enable the user to select the
hours, minutes, and day. The clock will continue to function correctly
if the growth chamber's power has been removed.
The date, month, and year selection is performed in Configuration
mode and will be discussed later. The date, month, and year have been
preset at the factory. If required, see CALEN AR in this section.
A. Press the CLOCK key and the displays will show the following:
A number other than 10 might be shown in the right display. Also,
if no keys are pressed within 15 seconds, the displays will return to
their previous state.
Using either the up or down arrow keys, the user can select the
correct hour of the day. After the correct hour has been selected,
ENTER must be pressed and the displays will change to those
illustrated in Step B. If the hour was correct when the CLOCK
was pressed, press ENTER and the displays will change to those
shown in Step B.
B. The displays will be similar to those below. These are for the
minute selection.
Again, a number other than 21 will most likely appear. This
display also has a 15-second time-out, just as the hour display.
Also, the next two displays in Steps C and will have a 15-second
time-out.
If the minutes are correct, press the ENTER key and the displays
will go to those in Step C.
If the minutes are incorrect, use the up or down arrow keys to
select the correct minutes and then press ENTER. The displays
will go to those shown in Step C.
Plant Growth Chamber 3-1Thermo Scientific

3-2 Plant Growth Chamber Thermo Scientific
Section 3
Operation and Calibration
C. The displays will be similar to those below. This is for AM/PM
selection.
If the AM/PM is correct as indicated by the AM/PM lamps, then
press ENTER and the displays will go to those in Step .
If the AM/PM is incorrect, use the u or down arrow keys to select
the proper one and then press ENTER.
. The displays will be similar to those below. These are for the day
selection.
If the day is correct, press ENTER and the growth chamber will
return to regular operation and the setting of the clock is complete.
If the day is incorrect, use the up or down arrow keys to select the
day. While using the up or down arrow keys, observe the seven
day-of-the-week lamps for selecting the correct day. After the
correct day has been selected, press ENTER and the growth
chamber will return to normal operation and the setting of the
clock is complete.
2. Set Key - Pressing this key will change the displays to one of the
combinations shown below.
At this time, the user can select the growth chamber to operate in the
PROGRAM mode or CONTINUOUS mode.
If CONT is displayed, and you wish to change to PROG, press the up
arrow key. The displays will return to their normal operation of
showing time and temperature. Also the continuous lamp will
extinguish and the PROGRAM lamp will illuminate. The growth
chamber will automatically determine the programmed set point
temperature and light status for the present time and day of the week.

If PROG is displayed and you wish to change to CONT, press the
down arrow key and the displays will change to the following:
Now the user can select the SETPOINT temperature to operate at by
means of the up or down arrow keys, then pressing the ENTER key.
Note If the user selects the CONTINUOUS mode of operation after
being in Program mode, the setpoint and light condition will remain the
same while the growth chamber was in Program mode. s
3. ROGRAM KEY - Before reading about this key, please take some
time to study the sample schedule sheet provided on page 1-4.
For each day, there are eight items which must be programmed and
are as follows:
Hour 1 (AM or PM)
Minute 1
Setpoint Temperature 1
Light On/Light Off 1
Hour 2 (AM or PM)
Minute 2
Setpoint Temperature 2
Light On/Light Off 2
When programming, it is important to keep in mind that "Hour 1"
must always be before "Hour 2". Also keep in mind that AM is before
PM.
Another important note about the operation of the program mode is
that, if the present time is before "Hour 1" of any day, the operation
of the growth chamber will be that of "Hour 2" of the previous day.
Plant Growth Chamber 3-3Thermo Scientific
Section 3
Operation and Calibration