Adjusting Indoor Unit Capacity (Fn7); Adjusting Target Pressure (Fn8) - LG Multi V5 Service Manual

Adjusting Indoor Unit Capacity (Fn7)

The Adjusting Indoor Unit Capacity function limits the maximum fan
speed on all indoor units to the "low" speed setting. Use the function
when it is known that the outdoor unit is operating at full capacity
during the heating season and the indoor unit air temperature in all
zones is low, or when it feels drafty in almost all of the conditioned
zones served by the system. The function can be used to lower or
raise the indoor unit leaving air temperatures, when the outdoor unit
is undersized, or the system is operating with a compressor out of
service. If this function is turned on, the indoor unit heating capacity
will be sacrificed to achieve a higher leaving air temperature.
For use on both heat pump and heat recovery systems.
• The Adjusting Indoor Unit Capacity Fn7 function is not a solution
for a poorly designed piping system, nor is it a solution for a system
that is not operating properly.
• Verify the system's refrigerant charge is correct before using this
function.

Adjusting Target Pressure (Fn8)

The Adjusting Target Pressure function modifies the refrigeration
cycle's high and low pressure target values; more specifically, modi-
fies the compressor discharge and suction target operating pressure
values. Can be used to enhance / turn down the cooling or heating
capabilities of variable refrigerant flow systems, optimizing refrigera-
tion cycle operation to maximize operational efficiency.
Separate, unique setting values can be assigned for cooling, heating
operation, and Hydro Kit operation.
If the outdoor unit is dedicated to Hydro Kit(s), or an indoor unit
combination includes a Hydro Kit in thermal on, see the right hand
column in the table below for the high pressure vapor target psig.
An indoor unit combination with the Hydro Kit in thermal off, see the
middle column in the table below for the high pressure vapor target
psig.
For use on both heat pump and heat recovery systems.
Table 29: Setting Adjusting Target Pressure Function.
Low Pressure Vapor Target
Setting
oFF (Default)
oP1
oP2
oP3
oP4
oP5
oP6
oP7
psig / kPa (ºF)
117 / 804 (39.5)
105 / 725 (34.0)
111 / 765 (37.0)
126 / 869 (43.5)
136 / 935 (47.5)
145 / 1,000 (51.0)
154 / 1,065 (54.3)
117 / 804 (39.5)
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
OTHER CONTROLS
Figure 17: Setting the Adjusting Indoor Unit Capacity Function.
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to ON.
Select from "oFF" or "on" options by using the SW03C forward
Adjusting Indoor Unit Capacity is set. PCB does not need reset.
Table 28: Setting Adjusting Indoor Unit Capacity Function.
Options
oFF (Default)
on
Figure 18: Adjusting Target Pressure Function.
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to ON.
Select from "oFF, "oP1" through "oP7" options (see table) by using the
Press the SW01D Reset Button one (1) time to reset PCB.
Adjusting Target Pressure is set.
High Pressure Vapor Target psig / kPa (ºF)
IDUs (Hydro Kit Thermal Off)
434 / 2,990 (122.8)
453 / 3,121 (126.1)
443 / 3,056 (124.5)
410 / 2,827 (118.5)
386 / 2,663 (114.1)
363 / 2,500 (109.5)
339 / 2,337 (104.8)
434 / 2,990 (122.8)
Setting Optional Modes
Function
Disabled
Function Selected; Enabled
IDUs (Hydro Kit Thermal On)
434 / 2,990 (122.8)
467 / 3,219 (128.7)
453 / 3,121 (126.1)
443 / 3,056 (124.5)
410 / 2,827 (118.5)
386 / 2,663 (114.1)
363 / 2,500 (109.5)
334 / 2,304 (103.6)
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