Thermo Scientific Jewett JBB1204 User manual

Installation and Operation Manual
Thermo Scientific Jewett®
Blood Bank Refrigerators

©2010 Thermo Fisher Scientific. All rights reserved.
“Suva®” is a registered trademark of DuPont.
All other trademarks are the property of Thermo Fisher Scientific Inc. and
its subsidiaries.

Table of Contents
i
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Unpacking and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.3 Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.4 Door Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.4.1 Adjustable Hinged Glass Doors (Undercounter Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.5 Door Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
4.6 Final Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
5 Drawers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.1 Removing the Drawers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
5.2 Reinstalling the Drawers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
5.3 Changing Drawer Slide Position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.4 Control Panel Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
6 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1 Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2 Programming Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.3 Service Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
7 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1 Start Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
7.2 Product Loading Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
7.3 Automatic Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
8 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1 Setpoint Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
8.2 Sensor Bottles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

ii
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
9 Alarm Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1 Operating the Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
9.2 Local and Remote Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
9.3 Installing a Remote Alarm (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.4 Alarm Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.4.1 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
9.4.2 Alarm Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
10 Chart Recorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.1 Set Up and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.2 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
10.3 Changing Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.4 Calibration Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
11 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11.1 Cleaning the Drawers and Cabinet Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
11.2 Cleaning the Condenser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
1 Introduction
Blood bank refrigerators are designed to meet strict AABB,
ANRC and FDA requirements for stored product safety.
This manual provides installation and operation instructions for:
Undercounter models (4.7 ft3), Space Saver models (11.5 ft3) and
Upright models (23.3, 29.2 and 51.1 ft3). Refer to Table 1 to
determine the specifications that apply to your unit.
The control system, standard on all models, includes:
•Key-operated power and alarm switch
•Preset temperature setpoint
•Digital temperature display with 0.1ºC resolution
•Graphic temperature display
•Audible and visual power failure indicators
•Alarm silence, ringback, and automatic reset functions
•Pushbutton alarm test
Other standard features include:
•Keyed door locks
•Remote alarm contacts
•CFC-free refrigerant
•CFC-free foamed in-place urethane insulation
•Quiet, hermetically sealed refrigeration compressors
Upright models (23.3 ft3and larger) also have: fully extendable
stainless steel drawers; a sensor selection button (for upper and
lower cabinet temperature readings); and an independent switch
for interior cabinet lights.
Seven day chart recorders are standard on all models.
2 Safety Precautions
In this manual and on labels attached to this product, the words
WARNING and CAUTION mean the following:
•WARNING: a potentially hazardous situation which, if not
avoided, could result in serious injury or death.
•CAUTION: a potentially hazardous situation which, if not
avoided, may result in minor or moderate 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:
•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.
•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.
•Your unit must be properly grounded in conformity with
national and local electrical codes. Never connect the unit to
overloaded power sources.
•Disconnect the unit from all power sources before cleaning,
troubleshooting, or performing other maintenance on the
product or its controls.
Table 1. Blood Bank Refrigerator Specifications
Model Voltage
Codea
a A = 115V, 60Hz; D = 208/230V, 60Hz; V = 220V, 50Hz; W = 240V, 50 Hz
Amps/
Breaker
Cu. Ft./
Liters Cabinet Door
Drawers/
450ml
bags
Dimensions H x F-B x W in. (cm) Net
Prod. Wt.
lbs (kg)
Interior Exterior
JBB404
A6.0/15
4.7/ Undercounter Single
solid 2/48 20 x 20.5 x 20
(50.8 x 52 x 50.8)
34 x 26 x 24
(86.2 x 66 x 61)
200
(91)
D6.0/15
V, W 6.0/15
JBB1204
A9.4/15
11. 5/
326 Space Saver
Single
hinged
glass
5/165 52.4 x 21.75 x 20
(133.2 x 55.2 x 50.8)
71.9 x 28.75 x 24
(182.6 x 73 x 61)
320
(146)
D6.0/15
V, W 6.0/15
JBB2304
A9.4/15
23.3
659 Upright
Single
hinged
glass
6/360 58 x 29 x 24
(147.3 x 73.7 x 61.0)
77.5 x 36.2 x 28
(196.9 x 92.0 x 71.1)
425
(193)
D6.0/15
V, W 6.0/15
JBB3004
A9.4/15
29.2/
826 Upright
Single
hinged
glass
6/462 58 x 29 x 30
(147.3 x 73.7 x 76.2)
77.5 x 36.2 x 34
(196.9 x 92.0 x 86.4)
500
(227)
D6.0/15
V, W 6.0/15
JBB5004
A 15.0/20
51.1/
1447 Upright
Double
hinged
glass
12/720 58 x 29 x 52.5
(147.3 x 73.7 x 133.4)
77.5 x 36.2 x 56.5
(196.9 x 92.0 x 143.5)
640
(290)
D8.5/15
V, W 8.5/15

2
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
3 Unpacking and Inspection
At delivery, examine the exterior for physical damage while the
carrier’s representative is present. If exterior damage is present,
carefully unpack and inspect the unit and all accessories for
damage.
If there is no exterior damage, unpack and inspect the equipment
within five days of delivery. If you find any damage, keep the
packing materials and immediately report the damage to the
carrier. Do not return goods without written authorization.
When submitting a claim for shipping damage, request that the
carrier inspect the shipping container and equipment.
4 Installation
4.1 Location
Install the unit in a level area free from vibration with a minimum
of 6 inches of space on the sides and rear and 12 inches at the top.
Do not position the equipment in direct sunlight or near heating
diffusers, radiators, or other sources of heat. The ambient
temperature range at the location must be 59 to 90°F
(15to32°C).
4.2 Wiring
CAUTION! Connect the equipment to a separate,
dedicated, power source with the correct voltage.
Power fluctuations or incorrect voltage can result in
severe damage to the equipment.
DANGER! For personal safety and trouble-free
operation, this unit must be properly grounded before
it is used. Failure to ground the equipment may cause
personal injury or damage to the equipment. Always
conform to the National Electrical Code and local
codes. Do not connect unit to already overloaded
power lines.
Always connect the equipment to a dedicated (separate) circuit.
Electrical codes require fuse or circuit breaker protection for
branch circuit conductors. Use time delay fuses for #12 AWG
circuits.
For all blood bank models, the wiring diagram is attached to the
back of the cabinet.
4.3 Leveling
The unit must be level. Rotate the leveling screws, located under
the front corners of the unit, until the unit is level. If the floor is
seriously out of level, you may need to shim the corners with thin
sheets of metal.
Note: Use thin sheets of metal to level units equipped with
optional casters.
4.4 Door Operation
Standard glass doors for models larger than the undercounter
model stay open if opened 90 degrees. Door spring tension
cannot be adjusted.
If the self-closing doors do not work properly, make sure the unit
is level.
4.4.1 Adjustable Hinged Glass Doors (Undercounter
Models Only)
On Undercounter models with hinged glass doors, you can use a
regular screwdriver to adjust spring tension and center each door
on its frame. The adjustment screws (“torque” for tension and
“sag” for door placement) are located on the bottom hinge
bracket (shown below in Figure 1).
Hinged glass doors can be propped open with metal braces at the
bottom hinges. Open the door 90 degrees or until you feel some
resistance. Push the door open past the resistance and the metal
braces engage. To close the door, push it toward the unit (past the
resistance).
Figure 1. Undercounter Hinge Bracket for Glass Door
Adjustments
CAUTION! Do not overtighten the tension as
damage to the equipment can result.
WARNING! Disconnect equipment from main power
before attempting any maintenance to equipment or its
controls.
To r q u e Sag

3
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
4.5 Door Seal
To check the door seal, complete the following steps:
1. Open the door.
2. Insert a strip of paper (a couple of inches wide) between the
door gasket and the cabinet flange and close the door.
3. Slowly pull the paper strip from the outside. You should feel
some resistance.
4. Repeat this test at 4-inch intervals around the door. If the
door does not seal properly, you need to either replace the
gasket, or adjust the door (see the previous page).
CAUTION! Door seal integrity is critical for blood
bank refrigerators. A loose fitting gasket allows moist
air to be drawn into the cabinet, resulting in quicker
frost buildup on the evaporator coil, longer running
time, poor temperature maintenance, and increased
operation cost.
The door seals on 12 ft3models can be adjusted. To correct a
faulty seal on these units, complete the following steps:
1. Open the door completely.
2. Remove the hinge pin cover to expose the door mounting
screws. This cover pops off.
3. Loosen the screws and move the door side of the hinge to
decrease the clearance between the gasket and the cabinet.
4. Tighten the screws and snap the hinge pin covers on.
5. Recheck the seal.
6. If the door does not seal properly, replace the gasket.
4.6 Final Checks
Before start up, complete the following steps:
1. Make sure that the unit is free of all wood or cardboard
shipping materials, both inside and outside.
2. Check the positions of the stainless steel drawers. If you
want to adjust the drawer slides in an Upright unit, follow the
instructions in Section 5.3.
3. Verify that the unit is connected to a dedicated circuit.
5Drawers
5.1 Removing the Drawers
To remove the drawers in Upright models (23 ft3and larger)
complete the following steps (refer to Figure 2):
1. Pull the drawer toward you until the slides are fully extended.
2. Lift the back of the drawer to disengage the mounting tabs
from the slots on the slides.
Note: The drawers fit snugly between the slides. Push the back
of the drawer from underneath to remove the drawer.
3. Raise the back of the drawer almost to a vertical position and
disengage the front mounting clips from the slides.
To remove the drawers on Space Saver models, depress the
hooks located on both sides of the drawers (about 1/3 of the way
back) and slide the drawers up and out.
Figure 2. Drawer Removal (Upright Models)
5.2 Reinstalling the Drawers
To reinstall the drawers in Upright models, complete the
following steps (refer to Figure 2):
1. Pull both drawer slides toward you until the slides are fully
extended.
2. Position the drawer between the slides and insert the front
mounting clips into the slots on front of the slides.
3. Push the back of the drawer down between the slides and
insert the drawer tabs into the back slots.
Note: The drawers fit snugly between the slides. Push on the
back of the drawer from the inside to insert the drawer
tabs completely into the slots. Make sure both drawer
tabs are aligned with the slots on the slides before
pushing the drawer down between the slides.
5.3 Changing Drawer Slide Position
The drawer slides are adjustable. You can position these slides in
the vertical slots which are spaced at one-inch intervals.
Drawer slides have a small wire safety clip at the front pilaster
which prevents the slides from falling when the drawers are
removed. To change the position of the drawer slides, complete
the following steps:
1. Locate the safety clip.
2. Slip your fingernail or a small screwdriver under the bottom
of the wire clip and pry the clip out toward the inside of the
refrigerator.
3. Lift up the slide at the front. The slide is free to move from
the front pilaster.
4. The drawer slide must be removed from the rear pilaster at
approximately a 45 degree angle toward the center of the
cabinet.
5. Pull the slide toward the front of the cabinet.
CAUTION! Drawer slides do not require lubrication.
Additional lubricant could impede movement of the
drawers when the lubricant is cold.
Tab s
Drawer slide
Slot

4
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
6.1 Control Panel Features
The control panel is located on the top right side of your blood
bank refrigerator. You can use the three pushbuttons (#5, #8, and
#9 in Figure 3) to change the temperature display (#1) or to
adjust temperature and alarm setpoints. The thermometer display
(#2) provides a quick visual indicator of current cabinet
temperature and alarm conditions.
Before starting up your refrigerator, take some time to review the
control panel functions:
1. Main temperature display — during normal operation, shows
cabinet temperature in degrees Celsius, as measured by the
upper sensor inside the cabinet. You can use the buttons to
display other values such as setpoints, extreme values, and
lower sensor temperature. The number in the main display
flashes when the value can be modified.
2. Thermometer — shows cabinet temperature and alarm
conditions. There are 10 horizontal bars: 9 are displayed
during normal operation, the tenth (top) bar indicates a warm
alarm condition. The number of bars illuminated indicates
approximate cabinet temperature. Depending on alarm
settings, 4 or 5 bars illuminated indicate that the cabinet is at
setpoint.
For example, suppose that the cabinet temperature setpoint is
+4ºC and that the warm and cold alarm setpoints are 8ºC and
0ºC. Then the number of bars illuminated indicates cabinet
temperature as follows:
bulb only 0ºC (cold alarm) 6 bars 4.8
1 bar 0.8 7 bars 5.6
2 bars 1.6 8 bars 6.4
3 bars 2.4 9 bars 7.2
4 bars 3.2 10 bars 8 (warm alarm)
5 bars 4 (setpoint)
When cabinet temperature exceeds the warm alarm setpoint,
the top bar of the thermometer flashes. When temperature is
lower than the cold alarm setpoint, the bulb flashes.
When you are in programming mode (described in Table 2)
the thermometer shows the setpoint value you are changing.
3. Power failure — illuminated when the main power supply is
interrupted. In this case the audible alarm also sounds.
4. Service required —illuminated when the controller is in
service programming mode or when simulated warm or cold
alarm conditions are failing to occur during an alarm test.
5. Increase — pushbutton used to increase setpoint values in
programming mode and for various display functions.
6. Door ajar — illuminated when the refrigerator door is open
and the alarm is activated (key switch turned to the alarm
position). (This feature is not available for 45 ft3sliding glass
door models.)
7. Battery low — illuminated when the backup battery is low.
8. Decrease — pushbutton used to decrease setpoint values in
programming mode and for various display functions.
9. Scan — pushbutton used to change the main display and for
various other functions.
10. Audible alarm — illuminates during warm and cold alarm
conditions.
For full descriptions of display, programming, and service
functions, refer to Tables 2, 3, and 4 on page 5.
6 Control Panel
Key Switch
1
34 5
678
210
9

5
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
6.2 Display Functions
Table 2. Control Panel Display Functions
6.3 Programming Functions
You can enter programming mode by pressing and holding for 5 seconds. Pressing repeatedly scrolls through the available setpoint
functions: cold alarm and warm alarm.
Table 3. Setpoint Programming Functions
6.4 Service Parameters
When the key switch is not turned to third (alarm) position, you can access service parameters by entering programming mode and
pressing Scan for an additional 5 seconds. On release of the button, the display will go blank, then display “SEr” with the service
wrench icon illuminated. Then the firmware checksum (read-only) will be displayed for about 4 seconds. Pressing Scan repeatedly
scrolls through the available service functions. While you are in service mode, the wrench icon is illuminated. For any flashing
parameter you can use and to adjust the value.
CAUTION! Resetting any of the following parameter values could adversely affect the performance of your blood bank
refrigerator. These settings very rarely need to be changed for normal +4ºC operation. Be sure to call Technical Service before
making any adjustments to service parameter values.
Table 4. Service Parameters
Function Meaning Sequence Display
Normal operation Default display while refrigerator
is running — Temperature display and thermometer show cabinet temperature.
Cold excursion Show coldest cabinet temperature
since last startup or reset Press Display shows cold excursion while button is pressed.
Warm excursion Show warmest cabinet temperature
since last startup or reset Press Display shows warm excursion while button is pressed.
Mute Silence audible alarm Press Scan Display and thermometer show cabinet temperature,
alarm icon continues to flash.
Reset Return to default display after
excursion or alarm condition
Press and
simultaneously, hold
for five seconds
Excursion values are reset; temperature display shows
cabinet temperature.
Alarm test
Test by simulating warm alarm
conditions; key switch must be in
alarm mode
Press and
Scan
simultaneously
Display and thermometer show simulated cabinet
temperature, alarms flash and sound as appropriate.
Alarms clear when test is completed.
Lower sensor Display lower cabinet temperature
Press and
Scan
simultaneously and
hold
Display shows lower cabinet temperature while buttons
are held, returns to upper cabinet temperature when
buttons are released. ERR is displayed if no lower sensor
probe is detected.
Function Programming Sequence
Adjust cold alarm setpoint
Enter programming mode by pressing Mute and holding for 5 seconds. On release, the current cold alarm setpoint
value flashes in the temperature display; use and to adjust it. The display automatically returns to normal operating
mode 30 seconds after the last key entry or after scrolling through both available functions.
Adjust warm alarm setpoint
Enter programming mode and press Scan repeatedly until the top of the thermometer is illuminated. The current warm
alarm setpoint value then flashes in the temperature display; use and to adjust it. The display automatically returns
to normal operating mode 30 seconds after the last key entry or after scrolling through both available functions.
Parameter Notes Parameter Notes
1. Offset Center air temperature calibration. Default value is 0. 6. Defrost Termination Temperature at evaporator at which defrost
cycle terminates; default value is 4ºC.
2. Cut On Cabinet temperature at which compressor starts to
cool down to setpoint. Default value is 6ºC. 7. Short Cycle Delay Range 0 to 15 minutes; default value is 0.
3. Differential
Cut On – differential = temperature at which
compressor stops after achieving cabinet temperature
setpoint. Default value is 3.
8. Control Probe
Temperature Display only.
4. Defrost Interval Range 1 to 12 hours; default value is 1. 9. Defrost Probe
Temperature Display only.
5. Defrost Duration Range 5 to 30 minutes; default value is 15.

6
Thermo Scientific Jewett Blood Bank Refrigerators Installation and Operation
7 Operation
7. 1 S t a r t U p
To start up the refrigerator, complete the following steps:
1. Plug in the power cord.
2. Insert the key in the switch and turn the power on.The display
will show the actual cabinet temperature.
3. Rotate the power switch to the ALARM ON position when
the temperature drops below the warm alarm setpoint.
4. Allow the unit to reach operating temperature before loading
it with any product. To stabilize the temperature profile,
a 24-hour waiting period is recommended.
5. After the unit has pulled down to the desired operating
temperature, turn the three position key switch one turn
further clockwise to the Alarm On position.
6. If you have a remote alarm, hook it up at this point (refer to
Section 9.3 on page 7).
7. Whether you have a built-in alarm or a customer-installed
remote alarm, you should test it following the instructions in
Section 9.4 on page 7. Alarm setpoints are factory pre-set for
5.5°C (warm) and 1.5°C (cold).
7.2 Product Loading Guidelines
When loading your blood bank refrigerator, take care to observe
the following guidelines:
•Never load the blood bank beyond capacity. Table 1 on
page 1 shows the number of 450ml bags that can safely be
stored in your unit.
•Distribute the load as evenly as possible. Temperature
uniformity depends on air circulation, which could be
impeded if drawers are overfilled, particularly at the top of
the cabinet.
•For critical applications such as blood storage, be sure that
the alarm systems are working and active before you load
any product.
7.3 Automatic Defrost
The defrosting process on all models is primarily accomplished
by air circulated during off-cycle periods.
Under normal conditions, the temperature warm-up during
defrost is virtually unnoticeable. However, an occasional 2°C
warm-up is possible if usage is heavy and ambient conditions are
extreme.
8 Temperature Control
8.1 Setpoint Control
Your individual unit has been adjusted and factory tested to
maintain a +4°C cabinet temperature. For most blood bank
applications, you will not need to change the temperature
setpoint.
Cabinet temperature setpoint is a computed value based on the
service parameters Cut On and Differential. To adjust the
setpoint:
1. Be sure that the key switch is not turned to the third (alarm)
position. In order to protect the contents of the blood bank,
access to service parameters is disabled when the unit is in
alarm mode.
2. Access the service parameters as shown in Table 4 on page 5.
3. Adjust the values of Cut On and Differential as needed.
8.2 Sensor Bottles
Cabinet temperature is measured by probes inserted in sensor
bottles. The bottles contain equal portions of glycerine and water
to simulate blood samples. Keep the sensor bottles completely
full up to the top of the bottle.
Space Saver models have one factory-installed sensor bottle. In
Upright models (23 ft3and larger) there are two sensor bottles,
positioned as shown in Figure 4.
Figure 4. Sensor Bottles (Upright Models)
The default sensor reading for Upright units is the bottle at the
top of the cabinet. You can check the temperature in the lower
sensor bottle by pressing and holding and Scan
simultaneously (refer to Figure 3 on page 4). When you release
the buttons, the temperature display returns to the upper sensor
reading.