Thermo Forma Power Plus 8500 Series Mode d'emploi

Models:

8515 and 8520

8580 and 8583

Power Plus™

Upright Freezers

17 and 23 cu. ft. capacity

Operating and Maintenance Manual

Manual No: 7028515 Rev. 7

Model 8515 Series ________________________________________________________________________________

Read This Instruction Manual.

Failure to read, understand and follow the instructions in

this manual may result in damage to the unit, injury to operat-

ing personnel, and poor equipment performance.

CAUTION! All internal adjustments and maintenance must

be performed by qualified service personnel.

Refer to the serial tag on the back of this manual.

The material in this manual is for information purposes

only. The contents and the product it describes are subject to

change without notice. Thermo Forma makes no representations

or warranties with respect to this manual. In no event shall

Thermo Forma be held liable for any damages, direct or inciden-

tal, arising out of or related to the use of this manual.

MANUAL NUMBER 7028515

-- 21210/FR-1661 12/4/02 Added vacuum relief port information ccs

7 20820/FR-1619 6/3/02 Corrected line side wiring in the boost/buck relay aks

-- 20684/FR-1596 3/28/02 Added sample pull-down chart after specs ccs

6 20251/FR-1526 2/22/02 Cordset connector aks

-- 19785/FR-1482 1/23/01 Added where-used to schematics ccs

-- 19363/FR-1429 10/19/00 New thermostat condenser hot temp to 43°C ccs

5 19151/FR-1384 7/21/00 Resize cabinet (RICH) aks

-- 18249/SI-7545 7/7/99 Added P/N 195517 air filter kit to parts list ccp

4 -- 11/9/98 Added battery change frequency in Section 3.2/E. Dutton ccp

REV ECR/ECN DATE DESCRIPTION By

Contains Parts and Assemblies

Susceptible to Damage by

Electrostatic Discharge (ESD)

CAUTION

Model 8515 Series ________________________________________________________________________________

Important operating and/or maintenance instructions. Read the accompanying text carefully.

Ce symbole attire l'attention de l'utilisateur sur des instructions importantes de fonctionnement et/ou d'entretien. Il

peut être utilisé seul ou avec d'autres symboles de sécurité. Lire attentivement le texte d'accompagnement.

Wichtige Betriebs- und/oder Wartungshinweise. Lesen Sie den nachfolgenden Text sorgfältig.

Importante instruccions de operacion y/o mantenimiento. Lea el texto acompanante cuidadosamente.

Potential electrical hazards. Only qualified persons should perform procedures associated with this symbol.

Ce symbole attire l'attention de l'utilisateur sur des risques électriques potentiels. Seules des personnes qualifiées

doivent appliquer les instructions et les procédures associées à ce symbole.

Gefahr von Stromschlägen. Nur qualifizierte Personen sollten die Tätigkeiten ausführen, die mit diesem Symbol beze-

ichnet sind.

Potencial de riesgos electricos. Solo personas das capacitadadas deben ejecutar los procedimientos asociadas con este

simbulo.

Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.

Risques potentiels liés à l'énergie. L'équipement en entretien ou en maintenance doit être éteint et mis sous clé pour

éviter des blessures possibles.

Geräte, an denen Wartungs- oder Servicearbeiten durchgeführt werden, müssen abgeschaltet und abgeschlossen wer-

den, um Verletzungen zu vermeiden.

El equipo recibiendo servicio o mantenimiento debe ser apagado y segurado para prevenir danos.

Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be damaged by elevated

temperatures.

Présence de surface(s) chaude(s) pouvant causer des brûlures sur la peau non protégée, ou sur des matières pouvant

être endommagées par des températures élevées.

Heiße Oberfläche(n) können ungeschützter Haut Verbrennungen zufügen oder Schäden an Materialien verursachen,

die nicht hitzebeständig sind.

Superficias calientes que pueden causar quemaduras a piel sin proteccion o a materiales que pueden estar danados

por elevadas temperaturas.

√ Always use the proper protective equipment (clothing, gloves, goggles, etc.)

√ Always dissipate extreme cold or heat and wear protective clothing.

√ Always follow good hygiene practices.

√ Each individual is responsible for his or her own safety.

Model 8515 Series ________________________________________________________________________________

iii

Model 8515 Series ________________________________________________________________________________

Table of Contents

Section 1 - Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.1 Preliminary Inspection . . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.2 Visible Loss or Damage . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.3 Responsibility for Shipping Damage . . . . . . . . . . . .2 - 1

Section 2 - Installation and Start-Up . . . . . . . . . . . . . .2 - 1

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

a. Enviro-Scan Microprocessor Monitoring System .2 - 1

b. Refrigerants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

c. Peak Control System . . . . . . . . . . . . . . . . . . . . . . .2 - 2

d. “Smart” Condenser Fans . . . . . . . . . . . . . . . . . . . .2 - 2

e. Built-In Automatic Voltage Compensation . . . . . .2 - 2

2.2 Environmental Conditions . . . . . . . . . . . . . . . . . . . .2 - 2

2.3 Unpacking List . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 2

2.4 Removing the Compressor Wedge Assemblies . . . .2 - 2

2.5 Installing the Wall Bumpers . . . . . . . . . . . . . . . . . . .2 - 3

2.6 Moving the Unit Through a Doorway . . . . . . . . . . .2 - 3

2.7 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 3

2.8 Attaching the Power Cord . . . . . . . . . . . . . . . . . . . .2 - 3

2.9 Connecting Power to the Freezer . . . . . . . . . . . . . . .2 - 3

2.10 Deactivating the Enviro-Scan Monitor for Storage .2 - 4

2.11 RS-232 Output Interface . . . . . . . . . . . . . . . . . . . . .2 - 4

2.12 Remote Alarm Connector . . . . . . . . . . . . . . . . . . . .2 - 4

2.13 Setting the Operating Temperature . . . . . . . . . . . . .2 - 5

2.14 Setting the Low and High Limit Set Points . . . . . .2 - 5

a. To Display or Change the Low Limit Set Point . .2 - 5

b. To Display or Change the High Limit Set Point .2 - 5

2.15 General Recommendations . . . . . . . . . . . . . . . . . . .2 - 5

2.16 Preparing the (optional) CoBex Temp Recorder . . .2 - 6

a. Installing the chart recorder battery . . . . . . . . . . .2 - 6

b. Installing the chart paper . . . . . . . . . . . . . . . . . . .2 - 6

c. Changing the recorder range . . . . . . . . . . . . . . . . . . . .

d. Calibrating the chart recorder . . . . . . . . . . . . . . . .2 - 6

e. Recorder Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 7

Section 3 - Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1

3.1 The Enviro-Scan Monitor . . . . . . . . . . . . . . . . . . . . .3 - 1

3.2 Main Power Switch (mains disconnect) . . . . . . . . . .3 - 1

3.3 Key Functions Requiring No Access Code . . . . . . . .3 - 1

a. Access Keys: . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 2

3.4 Key Functions Requiring the Access Code . . . . . . . .3 - 2

3.5 Audible Alarm and Control Panel Indicators . . . . . .3 - 2

3.6 Double Door Freezer (Factory-Built Option) . . . . . .3 - 3

3.7 Set Point Adjustment Screwdriver . . . . . . . . . . . . . .3 - 3

3.8 Automatic Voltage Compensation System . . . . . . . . .3 - 3

3.9 Cobex Temperature Recorder (optional) . . . . . . . . . .4 - 1

Section 4 - Calibration . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1

4.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1

4.2 Calibrating the Temperature Alarm Monitor Probe . .4 - 1

4.3 Calibrating Control Set Point Temperature Probe . . .5 - 1

4.4 Changing the Access Code . . . . . . . . . . . . . . . . . . . .5 - 1

Section 5 - Routine Maintenance . . . . . . . . . . . . . . . . . .5 - 1

5.1 Cleaning the Cabinet Exterior . . . . . . . . . . . . . . . . . .5 - 1

5.2 Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . .5 - 1

5.3 Cleaning the Air Filter . . . . . . . . . . . . . . . . . . . . . . . .5 - 2

5.4 Defrosting the Chamber . . . . . . . . . . . . . . . . . . . . . . .5 - 2

5.5 Cleaning the Door Gasket . . . . . . . . . . . . . . . . . . . . .5 - 2

5.6 Cleaning the Vacuum Relief Port . . . . . . . . . . . . . . . .5 - 2

5.7 Replacing the Performance Monitor/Alarm Battery .6 - 1

Section 6 - Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1

6.1 Servicing the Refrigeration System . . . . . . . . . . . . . .6 - 1

6.2 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . .6 - 1

6.3 Cabinet Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1

Section 7 - Specifications . . . . . . . . . . . . . . . . . . . . . . . .7 - 1

Section 8 - Spare Parts List . . . . . . . . . . . . . . . . . . . . . .8 - 1

Section 9 - Refrigeration Schematics . . . . . . . . . . . . . . .9 - 1

Section 10 - Assembly Drawings . . . . . . . . . . . . . . . . .10 - 1

Section 11 - Electrical Schematics . . . . . . . . . . . . . . . .11 - 1

Section 1 - Receiving

1.1 Preliminary Inspection

The freezer was thoroughly inspected and carefully packed

prior to shipment and all necessary precautions were taken to

ensure safe arrival of the merchandise at its destination.

Immediately upon receipt, before the unit is moved from the

receiving area, carefully examine the shipment for loss or dam-

age. Unpack the shipment and inspect both interior and exterior

for any in-transit damage.

1.2 Visible Loss or Damage

If any loss or damage is discovered, note any discrepancies

on the delivery receipt. Failure to adequately describe such evi-

dence of loss or damage may result in the carrier refusing to

honor a damage claim. Immediately call the delivering carrier

and request that their representative perform an inspection. Do

not discard any of the packing material or move the shipment

from the receiving area.

1.3 Responsibility for Shipping Damage

For products shipped F.O.B. Marietta, Ohio, the responsi-

bility of Thermo Forma ends when the merchandise is loaded

onto the carrier’s vehicle.

On F.O.B. Destination shipments, Thermo Forma’s and the

carrier’s responsibility ends when your Receiving Department

personnel sign a free and clear delivery receipt.

Whenever possible, Thermo Forma will assist in settling

claims for loss or in-transit damage.

Section 2 - Installation/Start-Up

2.1 Introduction

The Thermo Forma Power Plus™ non-CFC, Ultra-Low

Temperature Freezers feature front-to-back air circulation for

cooler compressor temperatures, increased performance and

reliability and longer compressor life. In this unique system,

ambient air enters the front grille of the freezer and passes

through the filter, condenser and compressor housing, exiting

out of the rear of the unit.

The semi-hermetic compressors provide for increased

reserve BTU removal and quicker temperature recovery.

An enlarged condenser and two cooling fans contribute to

better efficiency, even in high ambient conditions. Oversize

condensers also help extend compressor life. Cleaning the air

filter and condenser fins is done from the front of the unit.

Other important features of the Thermo Forma Power Plus™

Freezers are:

a. Enviro-Scan Microprocessor Monitoring

System

Enviro-Scan uses a digital display, audible and visual indi-

cators and a touch sensitive key pad to provide total control of

all freezer functions. The module digitally displays chamber

temperature and control setpoint, to the nearest degree C. High

and low alarm set points are easily programmed. A back-up bat-

tery system supplies power to the monitoring system during

electrical outages.

An RS-232 port provides a computer interface and moni-

toring of temperatures and alarms. A remote alarm connector is

also a standard feature.

b. Non-CFC, non-HCFC and non-flammable

refrigerants

Committed to a safer, healthier environment, Thermo

Forma has phased out the use of ozone depleting CFC (chloro-

fluorocarbons) in all of the company’s refrigerated products.

Thermo Forma also uses non-CFC foamed-in-place urethane

insulation and all packaging materials used in shipping are non-

CFC.

Model 8515 Series __________________________________________________________________Installation and Start-Up

2 - 1

c. Peak Control System

Due to the increased demands on today’s refrigeration sys-

tems, Forma Scientific has engineered a compressor protection

system called PEAK Control. In this system, a pressure switch

senses excessive compressor discharge pressure. When the dis-

charge pressure exceeds the design limit, a solenoid valve

opens allowing refrigerant to enter an expansion tank. The

refrigerant returns to the system through a capillary tube. The

PEAK Control System continues to monitor system pressures,

insuring they stay within design limits to help extend compres-

sor life.

d. “Smart” Condenser Fans

For maximum compressor protection, all Forma ULT freez-

ers include two tube axial fans in the compressor housing.

When both compressors are running, both fans operate to pull

ambient air through the condenser and over the compressors.

When both compressors are off, one fan remains ready to cycle

on when the thermostat senses a temperature rise above 32°C.

e. Built-In Automatic Voltage Compensation

A built-in, automatic voltage compensator is built into

every Forma 8500 Series non-CFC, Ultra-Low Temperature

Freezer to detect and respond to high or low voltage situations.

Voltage from the incoming power supply is monitored and

adjusted by the automatic voltage compensator, ensuring com-

pressor operation within design parameters. A light on the front

of the control panel indicates when incoming voltage is being

corrected.

An enlarged condenser and two temperature controlled

cooling fans also contribute to better efficiency, even in high

ambient conditions.

2.2 Environmental Conditions

The Thermo Forma Power Plus™ ULT Freezers are

designed to operate in the following environmental conditions:

• Indoors

• Altitude - up to 2,000 meters

• Temperature - 5°C to 40°C

• Humidity - 80% RH at or below 31°C, decreasing linearly

to 50% RH at 40°C

• Mains Supply Fluctuations - ± 10% of nominal

• Installation Category II 1

• Pollution Degree 2 2

• Class of Equipment I

• Climatic Class T (Tropical)3

__________________________________________

1Installation category (overvoltage category) defines the level

of transient overvoltage which the instrument is designed to

withstand safely. It depends on the nature of the electricity sup-

ply and its overvoltage protection means. For example, in CAT

II which is the category used for instruments in installations

supplied from a supply comparable to public mains such as

hospital and research laboratories and most industrial laborato-

ries, the expected transient overvoltage is 2500V for a 230V

supply and 1500V for a 120V supply.

2Pollution degree describes the amount of conductive pollu-

tion present in the operating evironment. Pollution degree 2

assumes that normally only non-conductive pollution such as

dust occurs with the exception of accasional conductivy caused

by condensation.

3Class T (Tropical) means that the freezers are electrically

safe in a 43°C ambient.

2.3 Unpacking List

A small bag containing the following accessories is packed

inside the freezer:

Qty. Stock # Description Purpose

2 510016 1/4-20 x 5-1/2” Bolt Wall Bumper

2 380520 Neoprene Cap Cap Protector

1 235013 Screwdriver Set

1 435051 8-3/4” Phillips Screwdriver

1 444062 Box end ratchet wrench Loosen shipping

bolts

1 34040 Key ring

2.4 Removing the Compressor Wedge Assemblies

The wedge assemblies, securing both compressors

for shipment, must be removed before putting the

freezer into service. Failure to follow these

instructions may damage the freezer and void the

warranty.

Model 8515 Series __________________________________________________________________Installation and Start-Up

2 - 2

1. Make sure the freezer is not connected to electrical

power.

2. Using a Phillips screwdriver remove the lower right side

and rear panels.

3. Remove the box end ratchet wrench from the parts bag.

4. Both compressors are secured with wedges, connected

by threaded rods, secured on both ends of the rods.

Figure 2-1

Rear Compressor Section

5. Working from the back of the compressor section, use

the wrench to remove the nut and washer securing the

wedge on the threaded rod. Remove the rear wedge.

6. Rotate the threaded rod counterclockwise to remove it

from the front wedge. Remove the front wedge. Discard

these packing materials (wedges, rods, nuts and wash-

ers).

7. Repeat these last two steps to remove the wedge assem-

bly from the second compressor.

8. Replace the side and rear panels.

2.5 Installing the Wall Bumpers

The parts bag contains two (2) 1/4-20 x 5-1/2” bumper

bolts and two (2) neoprene caps. Install the bolts (the holes are

pre-tapped) on the back side of the compressor section. Refer to

Figure 2-3. Install a neoprene cap on each bolt.

If the bumpers are removed, they must be rein-

stalled before the freezer is placed in the desired

location to ensure adequate ventilation and air-

flow for the compressor.

For proper ventilation and air flow, a minimum of 5” of

clear space is required behind the freezer. an additional 5”

(minimum) of clear space is also required on both sides of the

freezer. when locating the back of the freezer toward a wall or

obstacle(s), make sure that the wall bumpers are installed.

2.6 Moving the Model 8520 Through a Doorway

To move the Model 8520 through a 34.50” doorway, the

door stop bracket(s) must be removed. The single door units

have one door stop at the top right side of the unit. Double door

units have a second door stop at the bottom right side of the

unit. Using a 7/16” socket wrench, remove the two screws

securing each bracket. This permits the door(s) to be fully

opened so that the freezer can be moved through the doorway.

Remove the door stop bracket screws only.

Removing hinge screws will weaken the door, or

cause it to fall, and may result in injury to per-

sonnel and/or damage to the freezer.

2.7 Location

Locate the freezer on a firm, level surface in an area of

minimum ambient temperature fluctuation.

2.8 Attaching the Power Cord

1. Insert the power cord into the power outlet module (A).

2. Tighten screws (B) on the power cord retainer.

2.9 Connecting Power to the Freezer

Thermo Forma recommends that the freezer be

operated on a dedicated electrical circuit to avoid

circuit overload .

Before connecting the freezer to an adequate power

source, refer to the electrical data plate mounted on the back of

the unit or to the electrical specifications listed in

Specifications.

Model 8515 Series __________________________________________________________________Installation and Start-Up

2 - 3

Remove Side and

Rear Panels

Remove Nut from Threaded Rod

(both compressors)

Figure 2-2

2.10 Deactivating the Enviro-Scan Monitor for

Storage

The Enviro-Scan Monitor has been deactivated (placed in a

sleep mode) prior to shipment. The monitor activates when

power is applied to the freezer. If electrical power is lost or the

freezer is disconnected, the monitor will be sustained by the

battery back-up.

Whenever the freezer is unplugged for storage,

the “Enviro-Scan” must be de-activated to pre-

serve the life of the battery and preserve the war-

ranty.

1. Turn off or unplug the freezer.

2. Obtain the access code prompt by pressing the UP

ARROW key and the BATTERY % CHARGE key

simultaneously. a “1” must appear in the display win-

dow. If “1” does not appear in the window, repeat step 2.

3. Enter the four digit access code. The Access Code set at

the factory - 1, 2, 3, 4. For Access Code information,

refer to Section 3.2. To change the Access Code, refer to

Section 4.4.

4. After entering the four-digit Access Code, press the

ENTER key and “CAL” will appear in the window.

5. Press the DOWN ARROW key.

6. The Enviro-Scan monitor is now deactivated (placed in

a sleep mode) until electrical power is restored.

2.11 RS-232 Output Interface

The 8500 Series freezers are equipped with an RS-232

Serial Communication Interface for the remote transmission of

sensor data. A standard DB-25S connector is located on the rear

of the compressor housing. The data is “dumb terminal” for-

matted, which permits interfacing with either a computer or a

serial printer.

Three wires are used for the RS-232 interface:

1) TX Data = Pin 2

2) RX Data = Pin 3

3) Signal Ground = Pin 7

The data format is seven-bit ASCII with a leading zero (8th

bit). Each character is transmitted with one start-bit, eight data-

bits, and two stop-bits, totaling eleven bits. NO parity-bit is

included. Baud rate is 1200.

A data transfer sequence is transmitted according to the fol-

lowing format. X refers to the variable numerical temperature

data.

(NUL) (-) XXX (SP) C (SP) (OVERTEMP) (SP) (LF) (CR)

(EOT) (SP) (UNDER TEMP )

The words “OVERTEMP” or “UNDER TEMP” are trans-

mitted with the temperature if one of those conditions exists at

the time the data is transmitted. When there is no alarm condi-

tion, spaces will be sent instead so that there is always a total of

20 characters sent.

SP - space

LF - line feed

CR - carriage return

EOT - end of text

NUL - null character (00)

The Enviro-Scan Monitor transmits temperature and alarm

condition data when power is first applied to the monitor, then

once every hour.

The Enviro-Scan Monitor responds to two ASCII com-

mands from the remote: DC1 (XON) and DC3 (XOFF)

DC1 (11H): The Enviro-Scan Monitor will transmit tem-

perature and alarm condition data upon receipt of DC1 and

resume 60 minute interval transmissions if they had been inhib-

ited by a DC3.

DC3 (13H): Receiving a DC3 from the remote inhibits the

Enviro-Scan Monitor from sending serial data indefinitely until

a DC1 is received or monitor power is removed and then reap-

plied.

Figure 2-4 identifies the location of the RS-232 output con-

nector.

Component Locations on Freezer Rear Panel

Figure 2-3

2.12 Remote Alarm Connector

For installations requiring remote temperature monitoring

or high/low temperature alarm systems, a remote connector is

provided on all Thermo Forma 8500 Series Upright Freezers.

Figure 2-3 identifies the location of the remote alarm connector,

Figure 2-4 identifies the pin output. (A label on the back of the

freezer cabinet also contains this information.)

Model 8515 Series __________________________________________________________________Installation and Start-Up

2 - 4

Remote Alarm

Connector

RS-232 Output

Connector

Power

Switch

Accessory

Wire

Feed-through

Line

Cord

The alarm contacts are rated:

0.5A at 30VDC, 15 watts maximum.

0.6A at 24 VAC, 14 watts maximum

Key

Pin # Description

1 Over temperature Common

2 Over temperature N.C.

3 Over temperature N.O.

4 Millivolt Out (Positive +)

5 Under temperature N.C.

6 Millivolt Out (Negative -)

7 Under temperature Common

8 Under temperature N.O.

9 (Not Used)

10 (Not Used)

2.13 Setting the Operating Temperature

1. Turn the freezer on. The cabinet temperature will be

displayed in the LCD window.

2. Press the CONTROL SET POINT key and a “1” will

appear in the LCD window.

3. Enter access code (1,2,3,4). The “1” will remain in the

LCD window.

4. Press the ENTER key and the word “SET”, along with

the control set point temperature will be displayed in the

LCD window.

5. If an operating temperature other than that displayed in

the window is desired, turn the temperature set point

screw using the adjustment screwdriver. The set point

screw is located to the right of the ENTER key on the

Enviro-Scan Monitor control panel. (The adjustment

screwdriver is located on the bottom of the freezer

frame. Refer to Figure 3-2.)

Note: Thermo Forma recommends setting the cabinet tempera-

ture no colder than necessary for product storage.

6. Press the ENTER key and the LCD display will return

to the cabinet temperature.

2.14 Setting the Low and High Limit Set Points

The High Limit set point is factory-set at -65° C. The Low

Limit set point is set at 3° below the operating temperature. If

another temperature limit set point is desired, set as follows:

a. To Display or Change the Low Limit Set Point

1. Press the LOW LIMIT key and a “1” will appear in the

LCD window.

2. Enter the access code (1,2,3,4).

The “1” will remain in the LCD window.

3. Press the ENTER key and the Low Limit temperature

along with the word “SET LOW LIMIT” will be dis-

played in the LCD window.

4. Change the existing Low Limit temperature by pressing

the UP or DOWN arrow keys.

5. Press the ENTER key and the LCD display will return

to cabinet temperature.

b. To Display or Change the High Limit Set Point

1. Press the HIGH LIMIT key and a “1” will appear in the

LCD window.

2. Enter access code (1,2,3,4).

A “1” will remain in the LCD window.

3. Press the ENTER key and the existing High Limit along

with the word “SET HIGH LIMIT” will be displayed in

the LCD window.

4. Change the existing HIGH LIMIT by depressing either

the UP or DOWN arrow keys.

5. Press the ENTER key and the LCD display will return

to cabinet temperature.

2.15 General Recommendations

Avoid opening the door for extended time periods. Room

air, which is higher in humidity, will replace chamber air and

cause frost to develop. allowing the door to remain open for

extended time periods will cause the chamber to “warm-up”,

putting undue stress on the compressors.

This unit is not a “quick-freeze” device. Freezing large quan-

tities of liquid, or high-water content items, will temporarily

increase the temperature and will cause the compressors to

operate for a prolonged time period. damage to the compres-

sors may result and product safety may be jeopardized.

Model 8515 Series __________________________________________________________________Installation and Start-Up

2 - 5

Figure 2-4

Caution! Stored product should be

protected by an activated alarm system

capable of initiating a timely response

24 hours/day. Forma Alarms provide

interconnect for centralized monitoring .

Ce manuel convient aux modèles suivants

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