Operating Angle-Type Service Valve; To Access Service Port - Lennox Merit ML14XC1-018-230A Installation Instructions Manual

OPERATING ANGLE-TYPE SERVICE VALVE:

1 - Remove stem cap with an appropriately sized wrench.
2 - Use a service wrench with a hex-head extension (3/16" for liquid
line valve sizes and 5/16" for suction line valve sizes) to back the
stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
NOTE - A label with specific torque requirements may be affixed to the
stem cap. If the label is present, use the specified torque.
FIGURE 16

TO ACCESS SERVICE PORT:

A service port cap protects the service port core from contamination
and serves as the primary leak seal.
1 - Remove service port cap with an appropriately sized wrench.
2 - Connect gauge set to service port.
3 - When testing is completed, replace service port cap and tighten as
follows:
●
With torque wrench: Finger tighten and
torque cap per table 3.
●
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
●
With Torque Wrench: Finger tighten
and then torque cap per table 3.
●
Without Torque Wrench: Finger
tighten and use an appropriately
sized wrench to turn an addition­
al 1/12 turn clockwise.
FIGURE 17
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
STEM CAP
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
12
11
10
9
8
7
6
1/12 TURN
12
1
11
10
9
8
5
7
6
Checking and Adding System Charge
The ML14XC1 unit is factory-charged with enough
HFC-410A refrigerant to accommodate a 15-foot length of
refrigerant piping. Charge should be checked and adjusted
using the tables provided on the charging procedure
sticker located on the unit access panel. Detailed
information is provided in the ML14XC1 Installation and
Service Procedures manual (Corp1502-L7), which is
available on LennoxPros.com.
Homeowner Information
Before attempting to perform any service or mainte­
nance, turn the electrical power to unit OFF at dis­
connect switch.
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
The system should be inspected and serviced before each
cooling season by a licensed professional HVAC service
technician (or equivalent).
The following maintenance may be performed by the
homeowner.
Contact a licensed professional HVAC technician to
●
schedule a yearly inspection and maintenance
appointment for your equipment.
Check the indoor unit filter each month and replace the
●
filter, if necessary.
Have your Lennox dealer show you where your indoor
unit filter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind a
return air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed.
Disposable filters should be replaced with a filter of the
same type and size.
Check the indoor unit drain line for obstructions monthly
●
during the cooling season.
The indoor evaporator coil is equipped with a drain pan
1/6 TURN
to collect condensate formed as your system removes
1
humidity from the inside air. Have your dealer show you
2
the location of the drain line and how to check for
3
obstructions. (This would also apply to an auxiliary drain,
4
if installed.)
5
Check the area around the outdoor unit monthly and
●
remove any obstructions that may restrict airflow to the
outdoor unit. This would include grass clippings, leaves,
or papers that may have settled around the unit.
Trim shrubbery away from the unit and periodically check
●
for debris which collects around the unit.
2
During the winter months, keep the snow level below the
●
3
louvered panels.
4
NOTE The filter and all access panels must be in place
-
any time the unit is in operation. If you are unsure about the
filter required for your system, call your Lennox dealer for
assistance.
Page 14
CAUTION
Homeowner Maintenance
ML14XC1 SERIES