Roof Mounting - Lennox 14HPX-018 Installation Instructions Manual

ROOF MOUNTING
Install unit a minimum of 6 inches (152 mm) above the roof
surface to avoid ice build-up around the unit Locate the
unit above a load bearing wall or area of the roof that can
adequately support the unit Consult local codes for roof-
top applications
PREVAILING WINTER WINDS
©
I WIND BARRIER I
INLET AIR
0
INLET AIR
0
0
INLET AIR
INLET AIR
0
Figure 3. Rooftop Application Wind Barrier
If unit coil cannot be mounted away from prevailing winter
winds, construct a wind barrier Size barrier at least the
same height and width as the outdoor unit Mount barrier
24 inches (610 mm) from the sides of the unit in the direc-
tion of prevailing winds
In the USA. wiring must conform with current local codes
and the current National Electric Code (NEC) In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC)
WARNING
I
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size
1 Install line voltage power supply to unit from a properly
sized disconnect switch (see figure 6)
2 Ground unit at unit disconnect switch or to an earth
ground (see figure 6)
,
,
NOTE - To facilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box
using a proper conduit fitting.
NOTE - Units are approved for use only with copper
conductors. 24V, Class II circuit connections are
made in the low voltage junction box. Refer to figure 6
for field wiring diagram.
NOTE - A complete unit wiring diagram is located in-
side the unit control box cover.
NOTE - For proper voltages, select thermostat wire
gauge per the following chart:
Wire run length AWG # Insulation type
less than 100' (30m) 18 color-coded, temperature
more than 100' (30m) 16 rating 35°C minimum
Install room thermostat (ordered separately) on an in-
side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.
Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit (see figures 4 & 5).
NOTE - 24V, Class II circuit connections are made in
the low voltage junction box.
Thermostat Outdoor Unit
®1 ®
power
common
1st, stage aux heat
indoor blower
reversing valve
Indoor Unit
q_(_ power
_(__ common
iI_ 1st. stage aux. heat
4-@- ,
4®
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Figure 4. Outdoor Unit/Blower Unit Field Wiring
Indoor Unit
Thermostat
(R) -- -po-weL - - -_
oommon j
k.C/
(_ emergency h%at __
I
I
@
®
®
@
- _sL st_e Su£_FI l-
k
indoor btower
reversing valve
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor Unit
,_ power (_1
oommon@1
emer
heay_"_/_ e_
@1
-®1
®1
@1
Figure 5. Outdoor Unit/Blower Unit Field Wiring
(with outdoor thermostat and emergency heat relay)
505243 04/08
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