GDM HST02
TEC_TM_158 | REV. A | EN
06/28/2022
Page 13 of 28
www.truemfg.com
Cabinet Operation (cont.)
Sequence of Operation
When the cabinet is plugged in…
1.
Interior lights will illuminate on glass door models (see previous page for light switch location).
2.
An electronic control with digital display will illuminate.
3.
The display will alternate between
hSt
and
dLY
, indicating a delay. This delay allows the cabinet to reach temperature without a
false alarm. For more information, see “Health Safety Timer: Operation” on page 14.
• Total Freezer Delay: 105 minutes
• Total Refrigerator Delay: 60 minutes
4.
There may be a short delay before the compressor and/or evaporator fan(s) start. This delay may be determined by time or by
temperature, which could be the result of an initial defrost event that will last at least 6 minutes.
a.
At the start of every compressor cycle, the condenser fan(s) will reverse for blow dirt off the condenser coil.
5.
The temperature control cycles the compressor and evaporator fan(s) on and off together as determined by the set-point and
differential temperatures.
a.
The set-point is the
adjustable
pre-programmed temperature designed to match the average cabinet temperature.
b.
The differential temperatures are the
non-adjustable
pre-programmed temperatures used to determine when the
compressor shuts off and turns on.
6.
The temperature control/thermostat senses either an evaporator coil temperature or air temperature,
NOT product
temperature
.
7.
An analog thermometer, digital thermometer, or electronic control display may reflect the refrigeration cycle swings of up and
down temperatures, NOT product temperature.
The most accurate method to determine a cabinet's operation is to verify
the product temperature.
8.
Every cabinet requires a defrost event to ensure the evaporator coil remains clear of frost and ice buildup. The electronic control is
preprogrammed to initiate defrost by interval.
9.
An electronic control with a digital display will show
dEF
during defrost.
NOTE: The electronic control with a digital display will alternate between hST and dLY for at least 30 minutes after defrost
has terminated.
a.
A refrigerator will use the evaporator fans to clear the coil during defrost.
b.
A freezer will use heaters to clear the evaporator coil during defrost.
NOTE: The evaporator coil heater and drain tube heater are only energized during defrost. Defrost is terminated when a
specific evaporator coil temperature is reached or by a time duration.
