19
Table 20 — Display Code Definitions
SW8/SW9 Query Instructions
—
When you press
either SW8 or SW9, the MDC’s LED display will show a
query code. Press SW8 to move up in number. Press SW9 to
move down in number (i.e., 00) and then it will display the
corresponding value. See Table 21 for an explanation of these
display codes.
NOTE:
The main MDC and sub MDC have the same query
instructions. If the sub MDC does not have this parameter it
displays the value of the main MDC unit.
Table 21 — MDC Query Codes
TEST RUN
Before commencing a test run please check the following:
1. Ensure the MDC unit, indoor unit and outdoor unit are
installed correctly.
2. Ensure the piping and wiring are completed correctly.
3. Ensure there are no refrigerant leaks.
4. Ensure the drain is not clogged.
5. Ensure the piping is insulated.
6. Ensure the ground wiring is connected correctly.
7. Ensure the added refrigerant amount and added is correct,
based on the actual pipe length.
8. Ensure the supplied power voltage matches the voltage
on the unit nameplate.
9. Ensure the connected indoor unit quantity during the
quick check MDC query is the same as the actual
quantity.
DISPLAY
DSP1 AND DSP2 DISPLAY DEFINITION
S E0
Communication error with outdoor unit
S E1
T1 temperature sensor error
S E2
T2 temperature sensor error
S E3
T3 temperature sensor error
S E4
High pressure sensor error
S E5
Intermediate pressure sensor error
S E6
Low pressure sensor error
S P1
High pressure protection
SC ER
Commissioning test failure
no ID
No indoor unit under Indoor Unit 1
CS x
Indoor capacity overload under Indoor No.y
(y=X+1)
DISPLAYED
DESCRIPTION
COMMENT
First and
Second Digit
Third and
Fourth Digit
--00
Number of
online micro-
processors
Number of
online indoor
units
Actual value
--01
Number of
open micro pro-
cessors
Number of
open indoor
units
Actual value
--02
Number of
cooling indoor
units
Number of
heating indoor
units
Actual value
--03
Outdoor unit operation mode
--
--04
Opening of EXVA
Actual value
--05
Opening of EXVB
Actual value
--06
Opening of EXVC
Actual value
--07
Liquid inlet temperature (T1)
Actual value
(degrees C)
--08
Liquid refrigerant temperature
(T2)
Actual value
(degrees C)
--09
Bypass outlet temperature (T3)
Actual value
(degrees C)
--10
High pressure (H-YL1)
Actual value=
display value x
0.1 MPa
--11
Intermediate pressure (H-YL2)
Actual value=
display value x
0.1 MPa
--12
Low pressure (L-YL1)
Actual value=
display value x
0.01 MPa
--13
Version of software
--
--14
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Check end