Unit Start-Up; Adding Refrigerant For Longer Line Set - Lennox MPA012S4S-1P Installation Instructions Manual

COMP
YELLOW
CODE
COMP
CAP1
EEV
FM1
H-PRO
L
L-PRO
SV
TS
T3
T4

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 gas 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 10.
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.
BLACK
RED
FM1
BLUE
3
Y/G
3
W
BLACK
V
RED
U
BLUE
RED
CN54
BLUE
CN51
CN53
BLUE
CN52
YELLOW
L
PART NAME
COMPRESSOR
FAN MOTOR CAPACITOR
ELECTRIC EXPANSION
VALVE
OUTDOOR DC FAN
HIGH PRESSURE SWITCH
PFC INDUCTOR
LOW PRESSURE SWITCH
4-WAY VALVE
DISCHARGE
TEMPERATURE SENSOR
CONDENSER
TEMPERATURE SENSOR
OUTDOOR AMBIENT
TEMPERATURE SENSOR
Figure 43. 208/230V MLA024S4S-*P Outdoor Unit Wiring Diagram
SV
4-WAY1
BLUE CN3
BLUE
CN4
HEAT1
CN10
Crankcase Heater
HEAT2
Base Pan Heater
T3
T4
H-PRO
L-PRO

Adding Refrigerant for Longer Line Set

The outdoor unit is factory-charged with refrigerant.
Calculate the additional refrigerant required according to
the diameter and the length of the liquid pipe between the
outdoor unit and indoor unit connections.
Be sure to add the proper amount of additional refrigerant.
Failure to do so may result in reduced performance.
Table 6. Additional Refrigerant Charge
System Size
(KBtu)
09
12
18
24
36
48
27
EEV
CN33 CN20
YELLOW
S
BLACK
CN2
RED
CN22
CN40
P-1
Y/G
CN44
BLACK
CN5
CN6
RED
RED
BLACK
YELLOW
BLACK
RED
1 2 3 L1 L2
L1 L2
TO INDOOR UNIT POWER SUPPLY
Y/G
Y/G
Pipe Length Amount of Refrigerant
(feet / meters)
>25 (7.5) 0.161 oz/ft (15g/m)
>25 (7.5) 0.161 oz/ft (15g/m)
>25 (7.5) 0.161 oz/ft (15g/m)
>25 (7.5) 0.322 oz/ft (30g/m)
>25 (7.5) 0.322 oz/ft (30g/m)
>25 (7.5) 0.322 oz/ft (30g/m)
to add