TRUE ICE SERVICE MANUAL truemfg.com
TEC_TM_198 | REV. A | EN
P#857284
03/26/2024 Page 46 of 96
Sequence of Operations
Sequence of Operations
Unit will not drain
if water level is
below 24mm (APL)
Harvest Time:
Max. 20 min
Min. 10 sec
² Harvest ensures no
ice on the evaporator
before starting the
freeze cycle
Pressure
equalization
Drain Valve
Drain to 4mm
or less (APD)
Water Inlet
Valve
Water Inlet
Valve
Condenser
Fan
Drain
Valve
Water Inlet
Valve
¹⁰ Bin
Switch
¹¹ Bin
Switch
Bin
Switch
Drain
Valve
⁶ Water Inlet
Valve
Fill to 44 mm
(APF)
Fill to 44 mm
(APF)
Water
Pump
Water
Pump
Water
Pump
Harvest
Valve
Must drop below
43 mm (APP) in
60 sec (PMP)
After short delay,
the water valve is
energized to return
the sump level to
44 mm (APF)
¹ Drain
Valve
⁷ Condenser
Fan(s)
Drain to 4
mm or less
(APD)
Cut-In 165 psi
Low Speed
Compressor
³ After 5
sec delay,
compressor
is energized
Harvest
Valve
⁴ De-energized
when the T1
sensor reaches
50˚F (10˚C) (HR8)
Harvest
Valve
T1 sensor measures
evaporator outlet
temperature
Water Level Sensor
Monitors Water Level
Harvest cycle is initiated
On
On
OFF Energized Opens Closes Opens
11 sec
Drain to
4 mm or
less (APD)
⁹ Energized.
Drains for
15 sec
Energizes
when
drain valve
de-energizes,
fills to 29mm
(APH)
¹ For low ambient protection.
If T2, T3, or T4 are less than 30˚F
(-1.1˚C) (HL1), the unit will not
drain at this point.
² Start up Mode Only.
Max Harvest Time: 20 min
Min Harvest Time: 10 sec.
³ Compressor is energized until the bin is full or 30
consecutive cycles (Factory setting, level of water
hardness set to 0). After 30 consecutive cycles, the
unit will return to the Startup Cycle.
⁴ T1= Evaporator outlet
T2= Ambient air temperature
T3= Pump outlet water temperature
T4= Incoming water temperature
⁵ Max. Freeze Time = 30 min
Min. Freeze Time = 5 min
⁶ Water Inlet Valve will fill an additional
time after the pump motor has
started. Will fill to 46 mm (APF)
⁷ Condenser Fan(s)
PS1 = 160psi Low Ambient (No Condenser Fan)
PS2 = 165psi Normal/Low Speed
PS3 = 230psi High Speed
⁸ Max. Harvest Time = 10 min
Min. Harvest Time = 30 sec
⁹ Drain time can be increased by adjusting the
"Level of Water Hardness" in the menu. Each
increment increases drain time by 15 sec.
¹⁰ Low Ambient Harvest. If T2 or T4 sense a temperature
< 30˚F (-1.1˚C), when the Bin Flap closes this will not
terminate Harvest. Fill valve and water pump will run
until the sump is filled to the (APF) setting. This will
terminate harvest (water pump will remain on).
¹¹ If the Harvest time reaches 5 min and the bin switch
has not opened, the water pump will be energized
to circulate water of the ice until the sheet falls.
Note: Max harvest is 10 min.
Closes within 6 sec,
unit returns to Freeze
cycle
When the water level
falls below the (APL)
level for 5 sec (THT)
When the T1 sensor
is below the (H11)
setting for 5 sec (THT)
+
Self-Diagnostics:
Ensures components are working correctly
by using the water level sensor to monitor
water level changes in the sump
Startup
⁵
Freeze
⁸
Harvest Freeze Full Bin
To Next Page
Loading...
Need help?
General
