GENERAL LABORATORY REFRIGERATED
INCUBATOR
Installation, Operation and
Maintenance Instructions
GENERAL
Inspection 2
Location 2
Installation
General Information 3
OPERATION
Performance Data 3
Theory of Operation 3
MAINTENANCE
Troubleshooting 4
Maintenance Service & Analysis Guide 4
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2
3
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02/12 Rev. B 138691
GENERAL
INSPECTION
When the equipment is received, all items should be carefully checked against the bill of lading to
ensure all crates and cartons have been received. All units should be inspected for concealed damage
by uncrating the units immediately. If any damage is found, it should be reported to the carrier at once,
and a claim should be filed with the carrier. This equipment has been inspected and tested in the
manufacturing facility and has been crated in accordance with transportation rules and guidelines.
Manufacturer is not responsible for freight loss or damage.
LOCATION
Allow a minimum four-inch clearance on the top, rear, and sides of the cabinet for proper ventilation.
The cabinet should also be leveled when it is placed in its permanent location. If two or more units are
positioned side to side, allow a minimum of 8 inches between cabinets. Choose a site free from rapidly
changing ambient temperature conditions. Radiators, air-conditioning outlets and other ventilating
outlets can affect the operation of the Refrigerated Incubator by a sudden in rush of air that is different
from standard operating conditions. Do not stack items on top of the unit. Vibration during shipping and
handling may loosen mechanical connections. Check all connections during installation. Check all
wiring, piping and fasteners.
CAUTION
Do not modify cabinet construction or associated equipment assemblies.
Do not remove labeling or information supplied with the unit.
INSTALLATION
For electrical requirements see data information and wiring unit diagram located in parts bag, inside of
the cabinet. Check the proposed external power outlet/supply to be used to ensure that the voltage,
phase and current carrying capacity of the circuit from the electrical panel correspond to the
requirements of the cabinet. The power cord of this Refrigerated Incubator is equipped with a threeprong (grounding) plug which mates to a standard three-prong (grounding) receptacle. NEVER
extension cord to wire any unit. Refer to the serial tag (nameplate data) for all pertinent electrical
information.
power cord. Do not use a two-prong adapter plug.
Observe all Warning Labels. Disconnect power supply(s) to eliminate injury from electrical shock
or moving parts when servicing equipment.
The Refrigerated Incubator should not be operated in an environment where the ambient
temperature exceeds 90°F (32.2°C) as the compressor thermal overload will be tripped and will
result in a wide band control cycle of approximately ±4°C. Such cycling should not be
interpreted as a malfunction of the electronic controls.
When loading the Refrigerated Incubator, a space of ½” minimum should be allowed between adjacent
items to allow for maximum air circulation. Temperature uniformity will be adversely affected if air
circulation is obstructed.
Excessive frost buildup on the evaporator coil located on the rear cabinet wall will also affect
temperature uniformity.
WARNING- SAFETY PRECAUTIONS
Do not, under any circumstances, remove the third (ground) prong from the
use an
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1. Do not place any explosive, combustible or flammable materials inside the Refrigerated
Incubator.
2. Do not place sealed containers in the Refrigerated Incubators. Sealed containers filled
with materials do not allow for expansion and can develop dangerous vapor pressure as
the temperature increases.
3. Avoid liquid spillage within the chamber.
4. Do not evaporate noxious fumes.
5. Do not store containers filled with acidic or caustic solutions as vapors from these
materials will attack the evaporator and void the warranty.
GENERAL INFORMATION
The Refrigerated Incubator has been designed to provide maximum temperature control. The Incubator
provides dependable and precise performance is obtained through the microprocessor technology in the
temperature control circuitry. The
C to 50°C. The
temperature range will meet a wide variety of applications such as BOD determination, general
incubation and preservation of critical materials. Note: If operating below 2°C for extended periods of
time, the defrost setting should be turned on.
under counter 6 cu. Ft. refrigerated incubator has an operating range of 5° C to 50°C. This
upright 20 cu. Ft. refrigerated Incubator has an operating range of -10°
OPERATION
PERFORMANCE DATA
Upright 20 cu. Ft. Heat-Up Time: From -10°C to 50°C = 120 minutes (Compressor “ON”)
Cool-Down Time: From 50°C to -10°C = 100 minutes
Under counter 6 cu. Ft. Heat-Up Time: From 5°C to 50°C = 60 minutes
Cool-Down Time: From 50°C to 5°C = 60 minutes
Note: The above performance figures are based on the
following operating conditions:
Line Voltage……………………110.5 to 112.5 VAC
Ambient Temperature…………22.5° to 24°C
THEORY OF OPERATION
The refrigeration system, defrost heater and air circulating fan are used in conjunction with the
microprocessor controlled proportioning circuit to achieve very sensitive temperature control. An RTD
(Resistance Temperature Detector) located in the airstream senses any temperature deviation from the
set point and heat is provided proportionally to maintain the required temperature.
The circulating fan provides even air distribution throughout the cabinet interior and ensures
temperature uniformity.
settings. The controller, which is located on the facade of the unit, is factory set. Please see the
separate default instructions and explanation of the controls and operation of the controller.
The programmable controller controls the temperature and defrost
MAINTENANCE
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PERIODIC CLEANING
Disconnect power source before servicing or cleaning.
Beginning with the initial installation, the interior surfaces of the cabinet should be periodically cleaned
with a solution of warm water and baking soda. This solution will remove any odors from spillage that
has occurred. The exterior of the cabinet should also be cleaned frequently with a commercial grade of
glass cleaner. Caution: Do not use an abrasive or alkaline solution.
TROUBLESHOOTING
Problems encountered with any constant temperature cabinet are most frequently related to
temperature control. Before proceeding with detailed troubleshooting in accordance with the
Maintenance Service and Analysis Guide, ensure that the Low Limit and High Limit controls are properly
adjusted. If the limit controls are set too close or beyond the operating temperature, the Incubator may
constantly go into the alarm mode. This will result in erratic temperature control. If it is ascertained that
refrigeration service is required, contact a qualified service person. WARNING - Service should be
performed only by qualified service personnel. Line voltage and moving parts are present in the
control and machine compartments that are hazardous to life.
MAINTENANCE SERVICE AND ANALYSIS GUIDE
REFRIGERATION SYSTEM
MALFUNCTION POSSIBLE CAUSE SOLUTION
Compressor will not start - 1. Service cord unplugged 1. Plug in service cord
no hum 2. Fuse blown or removed 2. Replace fuse
3. Overload tripped 3. Determine reasons and correct
Compressor will not start - 1. Low voltage to unit 1. Determine reason and correct
hums but trips on overload 2. Relay failing to close 2. Determine reason, correct or replace
protector
Compressor starts and runs, 1. Low voltage to unit 1. Determine reason and correct
but short cycles on overload 2. Overload defective 2. Check current, replace overload protector
protector
Relay not operational 1. Voltage too high or too low 1. Determine reason and correct
Refrigerated space too warm 1. Control setting too high 1. Reset control
2. Evaporator coil iced 2. Determine reason and defrost
3. Air flow to condenser or 3. Remove obstruction for free air flow
evaporator blocked
Standard temperature system 1. Control setting is too low 1. Reset the control
freezes the product
Objectionable noise 1. Fan blade hitting fan shroud 1. Reform or cut away small section of shroud
2. Vibrating fan blade 2. Replace fan blade
Failure to Heat 1. Incorrect Control setting 1. See Control manual
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