Unit Start-Up; Service Information; Indoor Unit Alert Codes And Outdoor Unit Led - Lennox MCB Series Installation Instruction

Table 7. Single Zone Installation Electrical
Voltage/Phase,
Outdoor Unit Model
MCB012S4S-1L 115 / 1 / 60
MCB009S4S-1P
MCB012S4S-1P
208/230 / 1 / 60
MCB018S4S-1P
MCB024S4S-1P
MCA = Minimum Circuit Amps

Unit Start-Up

IMPORTANT
Units should be energized 24 hours before unit start-up
to prevent compressor damage as a result of slugging.
1. Inspect all factory- and field-installed wiring for loose
connections.
2. Verify that the manifold gauge set is connected.
3. Add additional refrigerant charge if required before
opening valves and while system is still under a
vacuum.
4. Open the liquid and suction line service valves to
release the refrigerant charge contained in outdoor
unit into the system.
5. Replace the stem caps and tighten to the value listed
in "Table 1. Torque Requirements" on page 6.
6. Check voltage supply at the outdoor unit terminal strip.
The voltage must be within the range listed on the
unit's nameplate. If not, do not start the equipment
until you have consulted with the power company and
the voltage condition has been corrected.
7. Refer to the included user guide to operate the system
using the provided remote control.
8. Visually check for binding of both indoor and outdoor
fans.
MCA Max Fuse
Hz
18
11
11
16
16

Service Information

Indoor Unit Alert Codes and Outdoor Unit LED

The following codes are display on the indoor unit LED on
30
the outdoor unit.
15 Table 8. Indoor Display Alert and Status Codes and
15
20
Unit Error Codes
20
Indoor unit EEPROM error
Indoor unit EEPROM parameter error
Communication error between indoor
unit and outdoor units
Indoor fan speed error (DC motor)
Indoor room temperature sensor
error (T1)
Indoor coil temperature sensor error
(T2)
Refrigerant leakage detection
(Cooling mode only)
Outdoor current overload protection
Outdoor ambient temperature sensor
error (T4)
Outdoor coil temperature sensor
error (T3)
Compressor discharge temperature
sensor error (T5)
Outdoor unit EEPROM error
Outdoor unit fan speed error (DC fan
motor)
Inverter module IPM error
High or Low voltage protection
Outdoor low ambient temperature
protection
Compressor drive error
Standby
Normal operation
Outdoor unit error
Communication error between main
control board and display board
Force Cooling
Remote or Wired controller Lock
Active clean
Time On
Time Off
Remote On/Off
ECO mode
Outdoor Unit LED:
Slow flash: Flashing at 1Hz
Fast flash: Flashing at 2Hz
14
Outdoor Unit LED
Outdoor Unit
Main Control
Board
MCB
System Error Codes
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
SLOW FLASH
LIT
FAST FLASH
n/a
Operational Status Codes
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Indoor
Unit
Display
MWCB
EH 00
EH 0A
EL 01
EH 03
EH 60
EH 61
EL 0C
PC 08
EC 53
EC 52
EC 54
EC 51
EC 07
PC 00
PC 01
PC 0L
PC 04
n/a
n/a
n/a
EH 0b
FC
LL
CL
On
OF
CP
On display
3 seconds