Lennox ELP Series User Manual

Page 9
TABLE 2
REFRIGERANT LINE SIZES
ELP Unit Liquid Line Vapor Line
090 5/8" (16mm) 1-1/8" (29mm)
120 5/8" (16mm) 1-1/8" (29mm)
B-Service Valves
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 3
lists torque values for typical service and repair items.
TABLE 3
Torque Requirements
Part 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 SETS
When checking the system charge, use a manifold gauge
set that features low-loss anti-blow back ttings. See g-
ure 9 for a typical manifold gauge connection setup.
Manifold gauge sets used with HFC-410A refrigerant sys-
tems must be capable of handling the higher system oper-
ating pressures. The gauges should be rated for use with
pressures of 0 - 800 on the high side and a low side of 30"
vacuum to 250 psi with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are typically used
for removing refrigerant, ushing, leak testing, evacuating,
checking charge and charging.
IMPORTANT
Only use Allen wrenches of su󰀩cient 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 o󰀨 the wrench, or stripping the valve stem
recess.
FIGURE 9
Each valve is equipped with a service port which has a
factory-installed valve stem.
1
2
3
4
5
6
7
8
9
10
11
12
1/6 TURN
1
2
3
4
5
6
7
8
9
10
11
12
1/12 TURN
Cap Tightening
Distances
FIGURE 10
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and tted
snugly over the cap before tightening.
To Access Angle-Type Service Port:
A service port cap protects the service port core from con-
tamination and serves as the primary leak seal.
1 - Remove service port cap with an appropriately
sized wrench.
2 - Connect gauge to the service port.

Lennox ELP Series Specifications

General

Brand	Lennox
Model	ELP Series
Category	Heat Pump
Language	English