GDM-HST02
TEC_TM_158 | REV. B | EN 12/4/2023 Page 25 of 48
truemfg.com
Appliance Operation (cont.)
Health Safety Timer (HST)
The health safety timer (HST) mechanically locks the appliance
when the electronic control detects the appliance temperature has
been above a preset temperature for 30 minutes. This prevents the
sale of unsafe food product.
Battery Backup
The appliance has a battery backup that ensures the electronic
control can still monitor the appliance temperature and actuate
the lock during a power outage. This battery backup provides
power to the control for a minimum of 2 hours. For more
information, see “Battery Backup” on pg. 21.
NOTICE ›
The appliance will lose cooling capabilities when
the power is lost.
NOTICE ›
If “Lock on power fail” is enabled, the door will lock
immediately when the power is lost.
Startup
During the initial startup, the electronic control display alternates
between hSt and dLY to indicate a delay. In addition to the timer
delay, the control automatically enables a loading delay. These
delays allow the appliance to reach temperature without a false
alarm.
• Total Freezer Delay: 105 minutes
• Total Refrigerator Delay: 60 minutes
NOTICE ›
If additional time or a delay event is needed, see
“Enable the Product Loading & Servicing Delay” on pg. 30.
Operation
The HST appliance’s operation is determined by the electronic
control, which constantly monitors the appliance temperature. If
the control detects the pre-programmed temperature parameters
(see below) for 30 minutes, it triggers the HST alarm.
• Freezer: 0°F (-17.78°C)
• Refrigerator: 41°F (5°C)
When the HST alarm triggers, the door mechanically locks and the
control provides an audio/visual alarm. The control emits a series of
beeps and the display alternately shows Loc and hLA.
To open the door during an active HST alarm, unlock the appliance
with the provided key. The HST Alarm will remain active. For
information on returning the door to its pre-alarm state, see “Clear
the Health Safety Alarm or Product Loading & Servicing Delay” on
pg. 31.
NOTICE ›
To order a replacement key, please contact our parts
department at 800-424-8783 or PartsInquiries@TrueMfg.com.
NOTICE ›
In case of emergency, the door may be opened
from the inside with the emergency release pull cord. See
“Emergency Release Pull Cord Operation” on pg. 6.
If the door switch determines the door has remained open for 5
minutes, the control provides an audio/visual alarm. The control
emits a series of beeps and the display flashes do. For more
information, see “Silence the Door Open Alarm” on pg. 31.
Silence the HST or door open alarm by pressing any button on the
control. The alarm will remain displayed and the door will remain
locked until its condition has been corrected or the alarm has been
cleared via password entry.
HST ACTION / RESULT
User Action Result
Unlock door with key Door unlocks, alarm still active
Press any button on the
control
Silences alarm, alarm still
active
Clear the alarm through the
control (see pg. 31)
Door returns to pre-alarm
state; alarm no longer active
USER ACTION!
The battery backup system ships with the power
switch toggled to OFF. Turn the battery backup
system on during installation. In the event of
power failure, the control display will show PF.
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