Thermostat
power
common
(_) 1st. stage aux. heat
Indoor
Unit
-k_
@
indoor blower .
reversing valve
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor
Unit
power
common
1st. stage aux. heat _)
G
@
Figure 6.13HPX and Blower Unit Thermostat Desig-
nations
Indoor
Thermostat Unit
®
power
common ¢
L
emergency heat It
]
I
I
1st. stage aux. heat _-
L
indoor blower
reversing valve
.power
_ common
emer.
J outdoor t'stat
-lZ_st. stage aux. heat
@J
®l
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor
Unit
Figure 7. Outdoor Unit and Blower Unit Thermostat
Designations (with auxiliary heat)
If the 13HPX unit is being installed with a new indoor coil
and line set, the plumbing connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the 13HPX system, re-
fer to the following section that includes flushing proce-
dures,
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections).
Use Lennox L15 (sweat, non-flare) series line sets as
shown in table 2 or use field-fabricated refrigerant lines,
Refer to Refrigerant Piping Guide (Corp. 9351-L9) for
proper size, type, and application of field-fabricated lines.
Valve sizes are also listed in table 2,
PLUMBING CONNECTIONS--13HPX MATCHED
WITH NEW INDOOR COIL AND LINE SET
If you are replacing an existing coil that is equipped with a
liquid line functioning as a metering orifice, replace the liq-
uid line prior to installing the 13HPX unit, See table 2.
Model
-018
-024
-030
-O36
-042
-048
-060
Table 2. Refrigerant Line Sets
Field
Connections
Liquid Vapor
Line Line
3/8 in. 3/4 in
(10 mm) (19 mm)
3/8 in. 7/8 in
(10 mm) (22 mm)
3/8 in, 1-1/8 in.
(10 mm) (29 mm)
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
3/8 in. 3/4 in L15-41
(10 (19 15ft,- 50ft.
mm) mm) (4.6 m - 15
m)
3/8 in. 7/8 in L15-65
(10 (22 15ft.- 50 ft.
mm) mm) (4.6 m - 15
m)
3/8 in. 1-1/8
in, Field
(10
mm) (29) Fabricated
NOTE - Units are designed for line sets of up to fifty feet (15
m); for longer lengths, consult the Lennox Refrigerant Pip-
ing Guide (Corp. 9351-L9). Select line set diameters from
table 2 to ensure that oil returns to the compressor.
INSTALLING REFRIGERANT LINE
Pay close attention to line set isolation during installation of
any heat pump or a/c system. When properly isolated from
building structures (walls, ceilings, floors), the refrigerant
lines will not create unnecessary vibration and subsequent
noises. Also, consider the following when placing and
installing a high-efficiency outdoor unit:
1. Placement--Some localities are adopting sound ordi-
nances based on the unit's noise level observed from
the adjacent property, not from the installation proper-
ty. Install the unit as far as possible from the property
line. When possible, do not install the unit directly out-
side a window. Glass has a very high level of sound
transmission. Figure 8 shows how to place the outdoor
unit and line set.
Install unit away
from windows.
Two 90 ° elbows
installed in line set will
line set vibration.
Figure 8. Unit Placement and Installation
2. Line Set Isolation--The following illustrations dem-
onstrate procedures which ensure proper refrigerant
line set isolation. Figure 9 shows how to install line sets
on horizontal runs. Figure 10 shows how to install line
sets on vertical runs. Figure 11 shows how to make a
transition from horizontal to vertical.
505325 03/08
Page 6
To Next Page
Loading...
Need help?
General