General Information; Torque Requirements; Using Manifold Gauge Set; Operating Service Valves - Lennox XP25-024-230-01 Installation And Service Procedure

IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working nearby these areas during installation or while
servicing this equipment.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single‐pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
General
The XP25 is a high-efficiency residential split-system heat
pump unit, which features a variable-capacity scroll
compressor and HFC-410A refrigerant. Units are available
in 2, 3, 4 and 5-ton sizes. The series is designed for use with
a check expansion valve (approved for use with HFC-410A)
in the indoor unit only.
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 HVAC components, ensure the
fasteners are appropriately tightened. Table 1 lists torque
values for fasteners.
must be grounded in
Only use hex 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 a hex
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.
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
Table 1. Torque Requirements
Parts
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap

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 sets used with HFC-410A refrigerant
systems must be capable of handling 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 or 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 3 provides information
on how to access and operate both angle and ball-type
service valves.
Page 7
IMPORTANT
IMPORTANT
Recommended Torque
8 ft.- lb. 11 NM
16 in.- lb. 2 NM
28 in.- lb. 3 NM
90 in.- lb. 10 NM
8 ft.- lb. 11 NM
XP25