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ML14XC1 SERIES
Component Specifications
Table 1. Service Valve Sizes and Refrigerant Line Set Recommendations
Model
Service Valve Sizes Recommended Line Set
Liquid Line Suction Line Liquid Line Suction Line L15 Series Line Sets
-018, -024, -030 3/8 in. (10 mm) 3/4 in. (19 mm) 3/8 in. (10 mm) 3/4 in. (19 mm)
L15-41 — 15 feet to 50 feet (4.6
meters to 15 meters)
-036, -041, -042, -047, -048 3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in. (22 mm)
L15-65 — 15 feet to 50 feet (4.6
meters to 15 meters)
-059, -060 3/8 in. (10 mm) 1-1/8 in. (22 mm) 3/8 in. (10 mm) 1-1/8 in. (22 mm)
NOTE — Some applications may require a field provided 7/8” to 1-1/8” adapter
Refrigerant Metering Device - Indoor Coil
FIXED ORIFICE (RFC) METERING
The following table lists the indoor coil orifice sizes
required for the specific outdoor unit listed. Refer to any of
the publications listed in this section to obtain the required
catalog number for a specific orifice size.
Table 2. Fixed Orifice Sizes
Model Orifice Size
-018 .052
-024 .060
-030 .060
-036 .071
-042 .081
-048 .083
-060 .096
EXPANSION VALVE (TXV) METERING
This unit is also compatible with systems that use an
expansion valve. Refer to any of the publications listed
below to obtain the required catalog number for a specific
expansion valve.
Lennox ML14XC1 Product Specification (EHB)
Lennox Product Catalog
Operating Manifold Gauge Set and
Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 3 lists torque values for
fasteners.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 3 provides
torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc -
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory-torqued (from 9 ft-lbs for
small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Notes #C-08-1
for further details and information.
Table 3. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant systems
must be capable of handling the higher system operating
pressures.
The gauges should be rated for use with pressures of 0 - 800
psig on the high side and a low side of 30” vacuum to 250
psig with dampened speed to 500 psi. Gauge hoses must be
rated for use at up to 800 psig of pressure with a 4000 psig
burst rating.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging. Each valve is equipped with a
service port which has a factory-installed valve stem. Figure
2 provides information on how to access and operating both
angle and ball service valves.
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