Mitsubishi Electric EHSD-MEC Installation Manual page 34

5
System Set Up
<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.
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 efficient and will increase running cost when compared to normal mode.
Freeze stat function
Menu subtitle
Freeze stat function *1
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.
Simultaneous Operation
For periods of very low outside temperature this mode can be used. Simultaneous
operation allows both DHW and space heating to run together by using the heat pump
and/or booster heater to provide space heating whilst only the immersion heater
provides heating for DHW. This operation is only available if BOTH a DHW tank AND
immersion heater are present on the system.
Cold weather function
For extremely low outdoor ambient temperature conditions when the heat pump's capacity is restricted the heating or DHW is provided only by the electric booster heater
(and immersion if present). This function is intended for use during extreme cold periods only. Extensive use of direct electrical heaters ONLY will result in higher power
consumption and may reduce working life of heaters and related parts.
• Range of outdoor ambient temperature at which cold weather function starts
is −30°C to −10°C (default −15°C).
• System shall automatically return to routine operation. This will happen when
the outdoor ambient temperature rises above the selected temp for this
specific mode of operation.
Floor dry up function
The Floor dry up function automatically changes the target hot water temperature
in stages to gradually dry concrete when this particular type of underfloor heating
system is installed.
Upon completion of the operation the system stops all the operations except the
Freeze stat. operation.
For Floor dry up function, the target flow temp. of Zone1 is the same as that of
Zone2.
Functions
Floor dry up function
Flow temp. increase step
Flow temp.
(increase)
Increase interval
Flow temp. decrease step
Flow temp.
(decrease) Decrease interval
Start & Finish
Max. target temp.
Target temperature
Max. temp. period
33
Function
To minimize the loss by frequent ON and OFF in mild outdoor ambient tem-
perature seasons.
To set max. possible flow temperature according to the type of heat emitters. 35 - 60
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 tem-
perature 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.
<Table 5.9.1> Heating operation (Room temp. control table)
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)"
Symbol Description
Set the function to ON and power on the system using the main remote
a
controller, and the dry up heating operation will start.
b Sets the increase step of the target flow temperature.
c Sets the period for which the same target flow temperature is maintained.
d Sets the decrease step of the target flow temperature.
e Sets the period for which the same target flow temperature is maintained.
f Sets the target flow temperature at the start and the finish of the operation. 25 - 60
g Sets the maximum target flow temperature.
Sets the period for which the maximum target flow temperature is main-
h
tained.
• Range of outdoor ambient temperature at which simultaneous operation
starts is −30°C to 10°C (default −15°C).
• System shall automatically return to routine operation. This will happen when
the outdoor ambient temperature rises above the selected temperature for
this specific mode of operation.
Target flow temp.
(°C )
(h)
45
(g)
40
35
(b)
(c)
30
(f)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Days
• This function is not available when a PUHZ-FRP outdoor unit is connected.
• Disconnect wiring to external inputs of room thermostat, demand control, and
outdoor thermostat, or the target flow temperature may not be maintained.
Range Unit Default
25 - 45 ºC 30
ºC 50
Normal/ Normal
Fast
—
10 - 60 min 10
On/Off On
—
−9 - −1 ºC −5
+3 - +5 ºC +5
(d)
(e)
Option/Range Unit Default
On/Off — Off
+1 - +10 ºC +5
1 - 7 day 2
−1 - −10 ºC −5
1 - 7 day 2
ºC 30
25 - 60 ºC 45
1 - 20 day 5