H-22
TF3 Series
Defrost control (except 1CH, compressor output model: TF31-1
)
Parameter
Defrost method Defrost operation
hTM
Heater defrost
Operates during the set defrost cycle/time
gTM
Hot-gas defrost
hTT
heater defrost
Operates when PV is lower than defrost end temperature during the set defrost cycle/time
(only for 3CH input model (TF33-
- ))
gTT
Hot-gas defrost
When operating a compressor for a long time, an evaporator and a freezer are freezing and thermal efficiency of
compressor is decreased. For increasing thermal efficiency, defrost operation helps to remove frost or ice around of
evaporator.
Set defrost cycle, time, and end temperature, etc to operate defrost (heater/hot-gas defrost).
The front defrost (DEF) output indicator (green) turns ON during defrost output and it flashes during defrost delay operation.
In case of comdefrost or auxiliary (alarm/evaporator-fan) output model (TF3 -2
- ), defrost operation is
available when defrost/auxiliary output [
sDA
] of parameter 1 group is set as defrost [
DEF
].
● Defrost cycle [
DIN
], defrost time [
DET
]
Set defrost cycle and time to operate defrost at every set cycle and during the set time.
Defrost cycle setting range: 0 to 24 (hour)/0 to 100 (min)
Defrost time setting range: 1 to 100 (min/sec)
※
Compressor operation during defrost is varied by defrost method. In case of heater defrost, compressor output turns
OFF, and in case of hot-gas defrost, compressor output turns ON. Evaporator-fan operation is varied by evaporator-fan
operation mode setting.
※
In case of RTC function model (TF33-3
-R/A), defrost operates at every specific time. Set real-time defrost cycle [
rDI
]
of parameter 3 group as [
ON
] and 8 real-time defrost times are available to set.
● Defrost end temperature [
EDT
], Defrost hysteresis [
dHY
] (only for 3CH input model: TF33-
- )
Set defrost end temperature and defrost hysteresis from input sensor 2 (defrost temperature). When the measured
temperature of defrost sensor is same as the set defrost end temperature, defrost operation is stopped. It is available when
input sensor 2 ON/OFF [
S2
] is set as [
ON
] and defrost method and operation [
DEF
] is set as [
hTT
] or [
gTT
].
Defrost end temperature setting range: -40 to 99 (
℃
) / -40 to 212 (
℉
)
Defrost hysteresis setting range: 1 to 5 (1.0 to 5.0) (
℃
) / 2 to 10 (
℉
)
● Manual defrost
Execute defrost manually regardless of the set defrost cycle which consists of defrost method and operation setting. Hold
the front key over 3 sec or, turn ON the digital input when digital input [
DI
] of parameter 5 group is set as [
mDF
] to
operate defrost during the set defrost time.
The front defrost (DEF) output indicator turns ON for 2 sec and turns OFF for 1 sec during manual defrost. Hold the front
key over 3 sec or turn OFF the digital input during manual defrost, and the set defrost cycle re-starts.
●
Defrost synchronization
(only for synchronize defrost function model: TF33-
A-S, RS485 communication model: TF33-
A-T/A)
When connecting over 2 units of TF3, defrost and compressor operation is able to synchronize via synchronize terminal/
RS485 communication.
It is available for synchronize defrost function model (TF33-
A-S), or RS485 communication model (TF33-
A-T/A).
[Setting Order]
1. Connect each other synchronize terminals or RS485 communication terminals of the units which are synchronized for
defrost.
2. Set defrost cycle [
DIN
] same as among the units. (if error occurs, defrost cycle is the setting of each unit)
3. Set defrost group [
dGR
] as 1 master unit [
MAS
] and slave unit (s) (up to 5 units) [
SLA
].
4. According to defrost operation of Master, the defrost operation of slave (s) executes. (when changing the defrost
parameters of master, defrost operations of slave (s) are also changed forcibly as same as the defrost operation of
master via connected terminals. The defrost parameters of slave (s) are not changed.)
※
Defrost operation by real-time defrost cycle is not able to synchronize.
※
Defrost operation of master is prior to the compressor operation of slave.
★
For more information about parameters for defrost operations, refer to user manual.
Defrost method and operation [
DEF
]
