AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
21
manual return function. The unit preheats the water pipe with hot water in the water tank. This method
requires manual operation but minimizes energy consumption.
Automatic control: Within the scheduled duration for automatic water return, the unit preheats the
water pipe based on the pipe temperature. This method does not require manual operation but
consumes more energy.
Steps of setting scheduled time for automatic water return are as follows: (The automatic
control mode needs to be set. For details on the setting method, see description on manual and
automatic switchover of the water return pump in section 6.8.3.)
Step 1: Press the FUNCTION mode to select the CYCLE function. The CYCLE icon blinks.
Step 2: Press the TIMER button to enter the scheduled time setting interface for water return. The
TIMER character, time value, and ON character are displayed at the time position, which together
indicate the scheduled start-up time. When the hour value for scheduled start-up blinks, it can be set by
pressing
Step 3: After the hour value is set, press the TIMER button to switch to the minute value for
scheduled start-up. When the minute value blinks, it can be set by pressing .
Step 4: After the minute value is set, press the TIMER button. The ON character disappears and the
OFF character is displayed. Meanwhile, the hour value blinks, indicating that the scheduled shutdown
Step 5: After the hour value is set, press the TIMER button to switch to the minute value for
scheduled shutdown. When the minute value blinks, it can be set by pressing .
Step 6: Press the TIMER button to switch back to the CYCLE function selection interface. If the
CYCLE character blinks, the scheduled time for water return is successfully set to a new value.
Step 7: When users press any button except the TIMER, FUNCTION, ON/OFF
shortly or stay in the selection interface for 5s, the current interface exits automatically and whether the
CYCLE character is displayed is determined based on the scheduled time for water return.
Main interface
The CYCLE icon
blinks.
The water return
timer is on and the
hour value blinks.
The water return
timer is on and the
minute value
blinks.
The water return
timer is off and the
hour value blinks.
The water return
timer is off and the
minute value
blinks.
Press the
FUNCTION
button.
Press the
TIMER
button.
Press the
TIMER
button.
Press the
TIMER
button.
Schedule time for
water return is
successfully set.
Notes: GRS-2.4/D270ANbA-K unit have no CYCLE function.
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