General Information; Setting The Unit; Electrical - Lennox HS40 Series Installation Instructions Manual

General Information

These instructions are intended as a general guide and do
not supersede national or local codes in any way. Authorities
having jurisdiction should be consulted before installation.
The HS40 unit is CE marked" in accordance with the re
quirements of the latest European Directives for Electrical
and Machinery Safety and Electromagnetic Compatibility. In
addition HS40 units have type Approval Certification with
the Gas Appliance Directive.

Setting the Unit

Refer to unit dimensions section for sizing mounting slab,
platforms or supports. Refer to figure 2 for installation clear
ances.
Installation Clearances
36
(914 mm)
*NOTE − A service clearance of 30" (762 mm) must be main
tained on one of the sides adjacent to the control box. Clear
ance to one of the other three sides must be 36" (914 mm).
Clearance to one of the remaining two sides may be 12" (304
mm) and the final side may be 6" (152 mm).
NOTE − A clearance of 24" (610 mm) must be maintained
between two units.
NOTE − 48" (1219 mm) clearance required on top
of unit. Maximum soffit overhang is 36" (914 mm).
Figure 1
FIGURE 2
NOTE−SEE UNIT WIRING DIAGRAM
FOR POWER SUPPLY CONNECTIONS.
CONDENSING UNIT
Yellow
Y1
Black
C
NOTE−IF INDOOR UNIT IS NOT EQUIPPED WITH
BLOWER RELAY, IT MUST BE FIELD PROVIDED
AND INSTALLED (P−8−3251 OR EQUIVALENT)
36
(914 mm)
36*
(914 mm)
36*
(914 mm)
HS40 TYPICAL FIELD WIRING DIAGRAM
ROOM THERMOSTAT
Y1
G W
C RC
TO 24V CLASS II POWER SOURCE
− 20 VA MINIMUM
A − Slab Mounting
When installing the unit at grade level, install it on a level
slab that is high enough above the grade to allow water to
drain adequately. The top of slab should be located so run−
off water from higher ground will not collect around the unit.
B − Roof Mounting
Install the unit at a minimum of 101 mm above the roof's sur
face. Ensure that the weight of the unit is properly distributed
over roof joists and rafters. Either redwood or steel supports
are recommended.

Electrical

The wiring must conform with current local codes and the
current Canadian Electrical Code (CEC). Refer and comply
with local electrical codes for field wiring rules and regula
tions.
Refer to the furnace or blower coil installation instructions for
additional wiring application diagrams and refer to unit rating
plate for minimum circuit ampacity and maximum overcur
rent protection size.
Unit must be grounded in accordance with national
and local codes.
ELECTRIC SHOCK HAZARD.
Can cause injury or death.
Line Voltage
To facilitate conduit, a hole is provided in the bottom of the
control box. Connect the conduit to the control box with the
proper conduit fitting.
NOTE − Units are approved for use with copper conductors
only.
24V, Class II Circuit
24V, Class II Circuit connections are made up in the low volt
age junction box. Refer to figure 3 for the field wiring dia
gram.
NOTE − A complete unit wiring diagram is located inside the
unit control box cover.
24V CLASS II INSTALLED AT FACTORY
24V CLASS II FIELD INSTALLED
RH
R
W1
G
W2
C
24V
CLASS II
JUNCTION
BOX
K3 INDOOR BLOWER RELAY
Page 3
WARNING
TYPICAL INDOOR UNIT
TRANSFORMER
T1
24v
TO
HEATING
TO
CONTROLS
COOLING
SPEED
TO
HEATING
GROUND
SPEED
PER NATIONAL
AND LOCAL
CODES
POWER