Step(Frequency) Control - LG AH-W096A0 Service Manual

2. Step(frequency) control

2.1 Frequency control
Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of
each room and the temperature set by the remote controller.
There are various factors determining the frequency.
1. Indoor unit capacity value.
2. Temperature compensation factor
3. Initial frequency setting
Indoor temperature
Indoor capacity
Indoor On/OFF
Indoor
System
data
ON/Setting
2.2 Primary step setting
: Capacity steps of compressor are decided by ∑Qj (Summation of capacity code), TA0(Outdoor temp.), TW(Inlet Water
temp.),DTW(Difference Outlet Water temp. and Setting Outlet Water temp.), DTR(Difference Air Indoor temp. and
Setting Air temp.), OP_ind(a number of Operating Indoors).
Comp_Step=(Step_base+ Long-piping) x ∆Step_TAO x ∆step_TW x ∆step_DTW + ∆step_OP_ind ....(1)
Comp_Step=(Step_base+Long-piping) x ∆Step_TAO x ∆step_TW x ∆step_DTR + ∆step_OP_ind.....(2)
✽ Between formular (1) and (2) only one formular is applied by system setting.
Step_base
∆Step_TAO
∆Step_TW
∆Step_DTW
∆Step_DTR
∆Step_OP_ind
Long-piping
✽ If target frequency step (Step base) exceeds maximum step, the Step base value follows the maximum step value.
✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating
capacity.
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Basic formula of
Outdoor
calculation
Temperature
Compressor setting
Outdoor Calculation of
data set frequency
Standard frequency step by ∑Qj (Summation of capacity code)
Step compensation by TAO (Outdoor temp.)
Step compensation by TW (Water inlet temp.)
Step compensation of temperature difference Outlet Water temp. and Setting temp.
Step compensation of temperature difference Indoor Air temp. and Setting temp.
a number of Operating indoor units
Comp. Step compensation by setting long piping
- 30 -
To & fro
feedback
Start
system
System
error
Control logic
Continues Stop
check system
LGE Internal Use Only