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TECHNICAL SERVICE MANUAL - ALL MODELS
TEMPERATURE
CONTROLS/
THERMOMETER/TIMERS
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NOTES
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TECHNICAL SERVICE MANUAL - ALL MODELS
TEMPERATURE
CONTROLS/
THERMOMETER/TIMERS
www.truemfg.com
Timer Adjustments
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TECHNICAL SERVICE MANUAL - ALL MODELS
www.truemfg.com
DEFROST TIME CLOCK OPERATION (WITH THE EXCEPTION OF
THE T-19F/T-19FZ/T-23F) GRASSLIN DEFROST TIMER
OPERATION INSTRUCTIONS
RECOMMENDED DEFROST SETTINGS:
True Manufacturing has factory set your defrost time clock to a recommended time
and duration defrost scenario. All refrigeration equipment operating below 30°F will
accumulate frost on the evaporator coil and will require routine defrost. Your True equipment has been designed for three defrost periods (6:00 a.m., 2:00 p.m. and 10:00 p.m.).
If you decide to deviate from these defrost time settings please follow the procedures
for adjustment below.
Tools Required:
• Phillips Screwdriver
• 1/4" Nut Driver or Socket
Locating The Defrost Timer:
Take off louvered grill assembly by removing four (4) corner screws.
Single Door Models:
1
Defrost Timer Box
Defrost timer is located in the lower right corner behind the louvered grill (inside galvanized electrical box).
Two Door Models:
Defrost timer is located in the middle of the cabinet, behind the louvered grill. Timer is
mounted to the left of the centered ballast box (Inside of gray timer box).
Three Door Models:
Defrost timer is located on the left upright post behind the louvered grill (Inside of gray
timer box).
Setting the timer:
(UNPLUG UNIT FROM POWER SUPPLY!)
DO NOT SET THE TIME BY ROTATING THE “OUTER” DIAL.
Turn the minute hand clockwise until the time of day on the outer dial is aligned with the
triangle marker on the inner dial (two o’clock position). (See image 2).
2
Inner
most dial.
Defrost Timer
Time of
day.
Outer most dial.
White tabs represent
15 minutes of
defrost time.
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1. Line (black wire)
2. Line if jumper installed (tan or black wire)
F. Normally closed contact temp control (red wire)
3. Normally open contact defrost heater (pink wire)
4. Normally closed contact door switches (tan or black wire)
N. Neutral (white wire)
X
. Defrost termination (purple wire)
Grasslin Timer Configuration
N
2
1
4
3
F
T
X
TECHNICAL SERVICE MANUAL - ALL MODELS
Adjusting The Defrost Timer:
(time initiated, time or temperature terminated).
www.truemfg.com
Your True freezer contains a defrost system that is temperature terminated, however the
time clock has been designed with a time termination back-up so that the defrost period
will not exceed thirty minutes. While True requires a minimum 3 defrost periods not to
exceed 30 minutes (2 tabs) the procedure on this page should be followed to customize
your specic needs.
The T-19F/T-19FZ/T-23F will have 4 defrost per day for 15 minutes (1 tab) each.
Factory setting 2 am, 8 am, 2 pm, 8 pm. 15 minutes in length.
The following procedure may be followed to customize your needs.
High usage, high temperature, and high humidity may require 4 defrost settings per day.
STEP 1 - The white tabs located on the outmost area of the time clock have
been factory set for (6:00 a.m., 2:00 p.m., and 10:00 p.m.). Each tab represents 15
minutes of defrost time. Notice that at each defrost time two white tabs are set
for 15 minutes each for a total of 30 minutes of defrost.
STEP 2 - In order to program the time to begin the defrost cycle, f lip the white
tabs out to set the defrost time. To eliminate a defrost time flip the white tabs
back toward the center of the Defrost Timer.
NOTICE:
If timer is not set for a minimum of 3
defrost per day for 30 minutes (2 tabs)
each, the coil may develop excessive
frost. This may lead to system failure and
product loss, which is not covered under
warranty.
WARNING:
Always follow the manufacturer’s
recommended settings when
programming the amount and duration
of the defrost cycles.
STEP 3 - True recommends a 30 minute (2 tabs) defrost cycle three times per day.
DISCLAIMER:
Wire colors are subject to change.
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TECHNICAL SERVICE MANUAL - ALL MODELS
www.truemfg.com
DEFROST TIME CLOCK ADJUSTMENT (PARAGON DEFROST TIMER)
OPERATION INSTRUCTIONS
RECOMMENDED DEFROST SETTINGS:
True Manufacturing has factory set your defrost time clock to a recommended time
and duration defrost scenario. All refrigeration equipment operating below 30˚F will
accumulate frost on the evaporator coil and will require routine defrost. Your True
equipment has been designed for three defrost periods (6:00 a.m., 2:00 p.m. and
10:00 p.m.). If you decide to deviate from these defrost time settings please follow the
procedures and adjustment below.
Tools Required:
• Slotted Screwdriver
Locating The Defrost Timer:
Take off lower grill assembly by removing four (4) corner screws.
Single Door Models:
Defrost timer is located in the lower right corner behind the louvered grill.
Two Door Models:
Defrost timer is located in the middle of the cabinet, behind the louvered grill. Timer
is mounted to the left of the centered ballast box.
Three Door Models:
Defrost timer is located on the left upright post behind the louvered grill.
Adjusting The Defrost Control
(time initiated, temperature terminated)
Your True freezer contains a defrost system that is temperature terminated, however the time clock has been
designed with a time termination back-up so that the
STEP 1 - Referencing the outer graduated time disk, position the
current time of day to align with the “TIME” indicator. To move
the graduated time disk, grasp the adjusted knob and turn counter
clockwise until the current time of day aligns with the “TIME” indicator.
defrost period will not exceed twenty minutes. While
True recommends 3 defrost periods not to exceed 30
minutes the procedure below should be followed to
customize your specic needs.
STEP 2 - In order to program the time to begin the defrost cycle,
insert threaded trip pins into the graduated time disk hole that
corresponds to your customized defrost needs.
Time
Indicator
Duration
Indicator
Graduated
Time Disk
Adjusting
Knob
Trip Pin
Extra Trip Pin
Trip Pin Hole
WARNING:
Always follow the manufactures recommended
settings when programming the amount and
duration of the defrost cycles.
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STEP 3 - True recommends a 30 minute defrost cycle three times per
day. Changing the recommended duration requires pressing down and
sliding the copper duration indicator.
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TECHNICAL SERVICE MANUAL - ALL MODELS
DEFROST CONTROLS
OPERATION INSTRUCTIONS
www.truemfg.com
2. TIME INITIATED, TIME TERMINATED
Like in the time initiated, temperature terminated controls; these
systems have a temperature sensor that will disconnect the heaters
to keep the cabinet from over heating. However it won’t restart
the freezing cycle until the control completes the factory set time.
These systems are also equipped with temperature sensors to delay the fan motors once the defrost cycle has been completed, to
prevent the circulation of warm air inside the cabinet.
MOTOR
To adjust the defrost cycle time there is only one possible adjustment; Once the cabinet has reach the design temperature, pick the
time of the day that you want the unit to defrost. Turn the actuating gear clockwise until the contacts change position initiating the
defrost cycle.
2 Heater
1 Line
4 Temp Control/
Fan Delay
Actuating Gear
Note: Older version timers had terminals #1 and #3 reversed.
3 Neutral
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TECHNICAL SERVICE MANUAL - ALL MODELS
www.truemfg.com
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