McQuay M4AC040A, Installation And Maintenance Manual

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Alarm Table
Display Type Comp. pump fan Resist. valve alarm
H1 high pressure OFF - ON - - ON
L1 low pressure OFF - OFF - - ON
t1 overload OFF OFF OFF - - ON
FL flow detector OFF OFF OFF - - ON
E1, E2, E3 probe OFF OFF OFF - - ON
n1 automatic timer - - - - - -
EE eeprom run - - - - - -
EL zero crossing - - - - - ON
d1 defrosting ON - - - - - -
r1 defrosting error - - - - - -
A1 antifreeze OFF OFF - - ON
LO low ambient temperature - - - - - ON
EU low supply voltage - - - - - -
EO high supply voltage OFF OFF OFF OFF OFF OFF
EP eeprom boot OFF OFF OFF OFF OFF OFF
Cn discon. Remote terminal - - - - - -
Ht high temperature - - - - - ON
Electrical features
Buttons and Relative Messages on Display
Power supply
Voltage supply range 24V –15%…+10% 50/60Hz (20,4V~26,4Vac)
Maximum power absorbed by the device 3W
Characteristics of the fuse (obligatory) to be inserted
in series to the unit power supply
315mAT
Power driving
Max. current for each power connector 2A
Relay output current (each relay, resistive load) 2A 250 V~
Relay output current (maximum 1 relay, resistive load) 3A 250 V~
Switching maximum number (each relay) 7000
Switching maximum time (each relay) 10 s
Setting and displaying the set point and the main control parameters (DIRECT
parameters).
The DIRECT parameters are set-points (Cooling and Heating) and main control parameters of the unit
(Cooling and Heating differentials, water temperature, condensation temperature/pressure). If
you press SEL for more than 5 seconds the display shows the code of the first parameter – the Cooling
set-point- that can be modified. Pressing the
Ÿ
and
ź
buttons allows to scroll all direct
parameters. Press SEL again to display the required DIRECT parameter and modify its value (with the
Ÿ
and
ź
buttons). Press PRG to store the modified parameters and exit the procedure, while the
SEL button allows to return to the DIRECT parameters menu. On setting the parameters, the
display will automatically flash after a few seconds if no buttons are pressed. If you do not press any
button within 60 seconds after having entered this procedure, the unit will return to normal operation
without storing the values of the modified parameters.
Setting and displaying USER parameters
These “working” parameters are protected by a password (22) to prevent any unauthorized access to
the data. Press PRG for more than 5 seconds (the buzzer must be off) to enter the USER
parameters (the unit “operating” parameters) menu and buttons
Ÿ
and
ź
to select the password
value, or, if the password is correct (22), press SEL to enter the USER parameter section. On
setting the password, the display will automatically flash after a few seconds if no buttons are
pressed. USER parameters selection: the display
6