Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 21

<Operation settings>
Heating operation
This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC collects and processes data for the auto
adaptation mode.
1. Heating operation for auto adaptation mode
Menu subtitle
Flow temp. range Minimum temp.
Maximum temp.
Room temp. control Mode
Interval
Heat pump thermo diff.adjust On/Off
Lower limit
Upper limit
Note:
1. The minimum flow temperature that prohibits heat pump operation is 20ºC.
2. The maximum flow temperature that allows heat pump operation equals to the maximum temperature set in the Flow temp. range menu.
* Fast mode is not most efficient and will result in increased running cost when compared to normal mode.
2.Heating operation for auto adaptation, compensation curve, and flow temp. control
Menu subtitle
Flow rate setting Mode
Flow rate
Note: Recommended flow rate setting at Manual mode is listed below.
・When the Flow temp. is high (e.g. radiator) recommended flow rate is low
・When the Flow temp. is low (e.g. underfloor heating) recommended flow rate is high.
・Low flow rate setting with low flow temp. may cause frequent ON/OFF operation of pump.
Freeze stat function
Menu subtitle
Freeze stat function
Flow t.
Outdoor ambient temp. Minimum outdoor ambient temperature which freeze stat function will begin to operate,
*1. When the system is turned off, freeze stat function is not enabled.
*2. Flow t. is fixed to 20°C and unchangeable.
GCH15010
Function
To minimize the loss by frequent ON and OFF in mild outdoor ambient
temperature seasons.
To set max. possible flow temperature according to the type of heat emitters.
Setting for Room temp. control
At Fast mode, target outlet water temperature is set higher than the one
set at normal mode. This reduces the time to reach the target room-
temperature when the room temperature is relatively low.*
Selectable according to the heat emitter type and the materials of floor (i.e.
radiators, floor heating-thick, -thin concrete, wood, etc.)
To minimize the loss by frequent ON and OFF in mild outdoor ambient-
temperature seasons.
Prohibits heat pump operation until the flow temperature drops below the
target flow temperature plus lower limit value.
Allows heat pump operation until the flow temperature rises above the
target flow temperature plus upper limit value.
< Heating operation(Room temp.control table) >
Function
Auto mode automatically selects a flow rate from 3 to 7 L/min appropriate
for effective operation according to Room temp. control. Manual mode
targets Flow rate setting value.
※Select Manual mode except for Room temp. control.
Select the target circulation flow rate for heating at Manual mode.
※Be aware of the shortage of required flow rate for each heat emitters.
Function/ Description
An operational function to prevent the water circuit from freezing when outdoor ambient temperature drops.
The target outlet water temperature at water circuit when operating in Freeze stat function. *2
(3 - 20ºC) or choose**. If asterisk (**) is chosen freeze stat function is deactivated. (i.e. primary water freeze risk)"
21
Range Unit Default
25 - 45 ºC 40
35 - 60 ºC 50
Normal/ -- Normal
Fast
10 ~ 60 mins. 10
On/Off — On
ºC
+3 - +15 ºC
Range Unit Default
Auto/ — Auto
Manual
3 - 8 L/min 7