Mitsubishi Heavy Industries SRR25ZJ-S, Technical Manual, Page: 66 / 174

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65
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'14 • SR-T-157
(s) High ceiling control
In the case of indoor unit installed in a higher ceiling room, the airflow volume mode control can be changed with the wired
remote control indoor unit function “FAN SPEED SET”.
- - - - - - -
PHi - Hi PHi - Me PHi - Hi - Me
STANDARD
HIGH SPEED1, 2
FAN SPEED SET
Hi - Lo Hi - Me Hi - Me - Lo
PHi - PHi - Hi - Me
PHi - Hi - Me - Lo
Indoor unit airflow setting
Fan tap
Note (1) Factory default is Standard.
(2) At the hot-start and heating thermostat OFF, or other, the indoor unit fan is operated at the low speed tap of each setting.
(3) This function is not able to be set with wireless remote controls or simple remote control (RCH-E3)
(t) Abnormal temperature thermistor (return air/indoor heat exchanger) wire/short-circuit detection
(i)
Broken wire detection
When the return air temperature thermistor detects -20°C or lower or the heat exchanger temperature thermistor detect
-40°C or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but,
if it is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air
temperature thermistor: E7, the heat exchanger temperature thermistor: E6).
(ii)
Short-circuit detection
If the heat exchanger temperature thermistor detects 70°C or higher for 5 seconds continuously at 2 minutes and 20
seconds after the compressor ON during cooling operation, the compressor stops (E6).
(u) Operation permission/prohibition
(In case of adopting card key switches or commercially available timers)
When the indoor function setting of wired remote control for “Operation permission/prohibition” is changed from “Invalid
(Factory default)” to “ Valid”, following control becomes effective.
XR5
Card key
switch
XR1
1
2
3
4
5
6
XR3
XR4
CnT
Blue
12V
XR2
Option
XR5
Normal operation
(Factory default)
Operation permission/prohibition mode
“Valid” (Local setting)
CnT-6
ON OFF ON OFF
Operation Stop
Operation
permission*1
Operation prohibition
(Unit stops)
*1 Only the “LEVEL INPUT” is acceptable for external input , however when the indoor function setting of
“Level input (Factory default)” or “Pulse input” is selected by the function for “External input” of the wired remote
control, operation status will be changed as follows.
In case of “Level input” setting In case of “Pulse input” setting
Unit operation from the wired
remote control becomes
available*(1)
Unit starts operation
*(2)
*(1) In case that “Operation permission/prohibition mode” setting is “Valid” and “External input” setting is “Level
input (Factory default)”;
① When card key switch is ON (CnT-6 ON: Operation permission), start/stop operation of the unit from the
wired remote control becomes available.
②
When card key switch is OFF (CnT-6 OFF: Operation prohibition), the unit stops operation in conjunction
with OFF signal, and start/stop operation of the unit from the wired remote control becomes not available.
*(2) In case that “Operation permission/prohibition mode” setting is “Valid” and “External input” setting is “Pulse
input (Local setting)”;
① When card key switch is ON (Operation permission), the unit starts operation in conjunction with ON signal.
and also start/stop operation of the unit from the wired remote control becomes available.
②
When card key switch is OFF (Operation prohibition), the unit stops operation in conjunction with OFF signal, and
start/stop operation of the unit from the wired remote control becomes not available.
(3) This function is invalid only at “Center mode” setting done by central control.