SO-LOW CH Series User manual

To reduce the risk of fire, electric shock or injury to persons using this freezer, read all
instructions and follow basic safety precautions before using the unit, including the following:
Do not modify the plug provided with the freezer. If it will not fit the outlet,
have a proper outlet installed by a qualified electrician.
Do not position equipment so it is difficult to disconnect from the power supply.
freezer must be at least 6” away from any wall or object on any side.
While under warranty, do not attempt to repair or replace any part of the
freezer for servicing without first contacting the So-Low Service Department.
SAVE THESE INSTRUCTIONS

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● MEANING OF ILLUSTRATED SYMBOLS…………………………………...
● STARTING INSTRUCTIONS…………………………………………………..
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●PRE-INSTALLATION INFORMATION………………………………………...
♦
● FREEZER STORAGE PROCEDURE……………………………………..….
● ALARM BATTERY REPLACEMENT…...……………………………………..
● CLEANING PROCEDURE……………………………………………………..
● DEFROSTING PROCEDURE………………………………………………….
♦
● CHANGING SETPOINT / OPERATION TEMPERATURE………….………
6
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● ALARM SYSTEM………………………………………………………………..
7
● DRY CONTACT RELAY………………………………………………………..
7
♦
● CONTROL KEYS & DISPLAYS………………………………………………..
8
● CONTROL DISPLAY VALUES………………………………………………...
9
● USER PARAMETER MODE…………………………………………………...
9
● PROGRAM PARAMETER MODE…………………………………………….
10
● CALIBRATION PROCEDURE………………………………………………...
11
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♦
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♦MAINTENANCE CHECKLIST

Various symbols are used in this safety manual in order to use the unit without
danger of injury and damage of the unit. Be sure that you understand the
warnings and cautions in this manual before operating the unit.
CAUTION
BLACK WITH YELLOW BACKGROUND
LIGHTNING BOLT
CAUTION, RISK OF ELECTRICAL SHOCK
WARNING
BLACK WITH YELLOW BACKGROUND
EXCLAMATION POINT
CAUTION, REFER TO ACCOMPANYING DOCUMENTS

WARNING
DURING OPERATION THIS UNIT MUST REMAIN IN UPRIGHT
POSITION. DURING TRANSPORATION UNIT MUST NOT BE
TIPPED MORE THAN 45° FROM UPRIGHT POSITION.
CAUTION
UNPLUG UNIT AND SWITCH OFF ELECTRICAL BREAKER
BEFORE ANY TECHNICAL SERVICE IS PERFORMED.
CAUTION
COVERS ON BACK / SIDE OF FREEZER MAY ONLY BE
REMOVED BY AUTHORIZED PERSONNEL. FAILURE TO
RE-INSTALL COVER COULD RESULT IN HAZARD.
CAUTION
UNIT MUST BE OPERATED ON A DEDICATED ELECTRICAL
LINE. USING A NON-DEDICATED LINE MAY RESULT IN UNIT
STARTUP FAILURE.
CAUTION
ONLY PLUG THIS UNIT INTO THE PROPER OUTLET. DO
NOT ATTEMPT TO MODIFY PLUG IN ANY WAY. IMPROPER
USE OF THE ELECTRICAL PLUG WILL VOID WARRANTY.
WARNING
DO NOT POSITION EQUIPMENT SO IT IS DIFFICULT TO
DISCONNECT FROM THE POWER SUPPLY.

ATTENTION
RISK OF ELECTRICAL SHOCK
USE CAUTION NEAR ELECTRICAL CONNECTIONS
NOTICE

NOTICE
THE LO-BAT (LOW BATTERY ALARM) IS NOT ABLE TO BE
SILENCED OR DISABLED.
TO REDUCE THE VOLUME OF THE ALARM UNTIL A
REPLACEMENT CAN BE INSTALLED, A PIECE OF TAPE CAN
BE PLACED OVER THE BUZZER HOLE ON THE CONTROL
CAUTION
DISCONNECT THIS UNIT FROM THE POWER SUPPLY
BEFORE PERFORMING MAINTENANCE ON THE UNIT.

ATTENTION
FOR UPRIGHT UNITS, IT IS IMPORTANT TO PROTECT THE
CONTROL FROM DRIPPING WATER. PLACE A CLOTH OR
TOWEL ON THE LEADING EDGE OF THE COOLING
CHAMBER ABOVE THE CONTROL TO DEFLECT / ABSORB
WATER THAT COULD DRAIN ONTO THE CONTROL.
ATTENTION
IT IS RECOMMENDED TO SLOWLY RE-ADD YOUR
PRODUCT INTO THE FREEZER TO PREVENT AN
EXTREME LOAD ON THE COMPRESSORS, WHICH
COULD SHORTEN FREEZER LIFE EXPECTANCY.

WARNING
CHANGING THE CONTROL PARAMETERS OUTSIDE OF
THE MANUFACTURE RECOMMENDED RANGE, COULD
SHORTEN THE LIFE-SPAN OF YOUR EQUIPMENT; OR
CAUSE ISSUES RESULTING IN MECHANICAL FAILURE.
WARNING
USE ONLY THE “UP” AND “DOWN” KEYS WHEN MAKING
CHANGES ON THIS CONTROL. WARRANTY WILL BE VOID
IF USED IN ANY OTHER WAY.
CONTACT FACTORY FOR ALL OTHER ADJUSTMENTS IN
SETTINGS.
TEMP
SET
-888
-888

•
ATTENTION
THE BATTERY DOES NOT POWER THE COOLING SYSTEM.
WARNING
IF IT IS NECESSARY TO REMOVE METAL COVER SCREEN
ON BACK OF FREEZER TO MAKE CONNECTIONS TO
ALARM RELAY, COVER MUST BE REPLACED BEFORE
FREEZER IS PUT INTO OPERATION

TOUCH KEYS
FUNCTION
DESCRIPTION
Up Key
Press and release to increase the control set-point (while in normal control
mode) or to change lower display program parameter (while in User Menu or
Factory Mode). Press and hold to accelerate increment speed.
Down Key
Press and release to decrease the control set-point (while in normal control
mode) or to change lower display program parameter (while in User Menu or
Factory Mode). Press and hold to accelerate decrement speed.
Pressing
key while in
normal control
mode
Scroll Key
Press and hold for at least 2 seconds and release (while in normal control
mode) to access operator level parameters. Press and release to cycle
through all user parameters. Press and hold for 2 seconds and release to
silence audible alarm under normal power or on battery power. While unit is in
an alarm condition, the external alarm relay contacts will remain energized
until the alarm condition no longer exists. Press and hold to display chamber
temperature while the controller is on battery power. Chamber temperature will
be displayed until key is released. Alarm contact will remain energized while
operating on battery power.
Press both keys
simultaneously
Current Power
Reading
Displays current AC power (i.e. 110VAC) as long as keys are pressed. If
power is 110VAC or 220VAC, unit will display 110. Mode is only active during
normal control mode (when top display = PV, Lower display = SP). N/A on
battery power.
Press both keys
simultaneously
Alarm Test
Energize audible alarm and alarm relay output as long as keys are pressed.
Mode is only active during normal control mode (when top display = PV,
Lower display = SP). N/A on battery power.
TEMP
SET
-888
-888

A
A
E
E
I
I
N
n
S
S
X
B
b
F
F
J
J
O
o
T
t
Y
y
C
C
G
G
K
Y
P
P
U
u
Z
C
c
H
H
L
L
Q
V
u
?
?
D
d
h
h
M
N
R
r
W
=
=
: Confused Character
To enter the user parameter mode, hold the Scroll Button
for 2 seconds and release.
To make changes in the user parameter mode, press the up or
down arrows.
To exit the user parameter mode, press and release the Scroll
Button.

To page through Parameters; Press and Release the scroll key
Please read the superscript instructions (bottom of page) for
each Parameter value.
THE FOLLOWING VALUES WERE SET WHEN THIS UNIT WAS SHIPPED
PARAMETERS
DESCRIPTION
°F
°C
ON
OFF
SPL 3
Lower Setpoint
-67
-67
X
SPH 3
Upper Setpoint
-32
-0
X
Al 2
Alarm
X
INV 1
Temperature Scale
°F
°C
X
SHF 1
Calibration
X
ASP 1
Alarm Differential
22
12
X
AHY 3,1
Alarm Hysteresis
1.8
1.0
X
OHY 3,1
Output Hysteresis
3.6
2.0
X
RB 1
Alarm Delay in Minutes
30
X
DoR 4
Door Alarm
X
SP 2
Setpoint
X
IN2 4
N / A
N / A

Press and Release the scroll key to page through Parameters.
Once value SHF is shown, Use the or arrow keys to change
value to ON.
PARAMETERS
DESCRIPTION
°F
°C
ON
OFF
SPL 3
Lower Setpoint
SPH 3
Upper Setpoint
Al 2
Alarm
INV 1
Temperature Scale
SHF 1
Calibration
X
•
•
•

Q:
•
•
•
•
•
•

TEMPERATURE CONTROL PARTS
PART #
FDC 4000
4000
HARDWARE PARTS
PART #
Hasp for CH Model
CH-HASP
Chest Lid (For Models CH25-5 / CH45-5 / CH40-5)
LID-5
Chest Lid Hinge (For Models CH25-5 / CH45-5 / CH40-5)
HINGE-CH-5
Chest Lid (For Models CH25-9 / CH43-9)
LID-9
Chest Lid Hinge (For Models CH25-9 / CH43-9)
HINGE-CH-9
Chest Lid (For Models CH25-13 / CH40-13)
LID-13
Chest Lid Hinge (For Models CH25-13 / CH40-13)
HINGE-CH-13

WARNING
IF FAILURE OCCURS AND UNIT IS STILL UNDER
WARRANTY, DO NOT ATTEMPT TO MAKE ANY REPAIR
MODIFICATIONS TO THE UNIT BEFORE CONTACTING
THE SO-LOW SERVICE DEPARTMENT, AS THIS MAY
RESULT IN WARRANTY BEING VOIDED.
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