Lennox HS29-012, Unit Information

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I − UNIT INFORMATION
HS29 condensing units are available in 1, 1 -1/2, 2, 2 -1/2, 3, 3
-1/2, 4 and 5 ton capacities.
All major components (indoor blower/coil) must be matched ac-
cording to Lennox recommendations for the compressor to be
covered under warranty. Refer to the Engineering Handbook
for approved system matchups. A misapplied system will
cause erratic operation and can result in early compressor fail-
ure.
II − UNIT COMPONENTS
Unit components are illustrated in figure 3.
DANGER
Electric Shock Hazard.
May cause injury or death.
Disconnect all remote electrical power
supplies berore opening unit panel. Unit
may have multiple power supplies.
Some units are equipped with single−
pole contactors. When unit is equipped
with a single−pole contactor, line voltage
is present at all components (even when
unit is not in operation).
A − Control Box (Figure 1 and Figure 2)
Electrical openings are provided under the control box cov-
er. Field thermostat wiring is made to color-coded pigtail
connections.
1 − Compressor Contactor K1
The compressor is energized by a contactor located in the
control box. See figure 1 and figure 2. Single−pole and two-
pole contactors are used in single-phase units. See wiring
diagrms for specific unit. Three-pole contactors are used in
three-phase units. K1 is energized by the indoor thermo-
stat terminal Y1 (24V) when thermostat demand is pres-
ent.
HS29 units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
2 − Dual Capacitor C12
The compressor (scroll, rotary or reciprocating) and fan
in single-phase units use permanent split capacitor mo-
tors. The capacitor is located inside the unit control box
(see figure 1 and figure 2). A single dual" capacitor
(C12) is used for both the fan motor and the compressor
(see unit wiring diagram). The fan side and the compres-
sor side of the capacitor have different MFD ratings and
must be exact when replacing. See side of capacitor for
ratings.
3 − Transformer T5
Transformer T5 is used on all J" voltage units. T5 is used as a
step-down transformer for the outdoor fan motor. The trans-
former is located inside the unit control box (see figure 1). The
transformer is rated at 3.4 VA with a 575 volt primary and a 460
volt secondary.
4 − Start Capacitor C7
All HS29−461, 511, 651, 012, 018 and 024−2 units use a
start capacitor (C7) wired in parallel with the compressor
side of the dual capacitor. The capacitor is located inside
the unit control box (see figure 1). C7 is switched off by
potential relay (K31) when the compressor nears full
speed. See side of capacitor for MFD ratings.
5 − Fan Capacitor C1
The fans in three-phase HS29−413, −463, −513, −653,
−683, −036, −042, −048 and −060 units use permanent split
capacitor motors. A single capacitor C1 is used for the
fan motor. The capacitor is located inside the unit control
box (see figure 1). See side of capacitor for MFD ratings.
6 − Potential (Start) Relay K31
All HS29−461, 511, 651, 012, 018 and 024−2 units use a
potential relay which controls the operation of the starting cir-
cuit. The potential relay is located inside the unit control box
(see figure 1). The relay is normally closed when contactor
K1 is de-energized. When K1 energizes, the compressor im-
mediately begins start-up. K31 remains closed during com-
pressor start-up and the start capacitor C7 remains in the cir-
cuit. When the compressor reaches 75% of its speed, K31 is
energized. When K31 energizes, the contacts open and
the start capacitor C7 is taken out of the circuit.
B − Compressor
(Rotary, Reciprocating and Scroll)
HS29−141 and −012 units utilize a rotary compressor.
HS29−018,−024−2, and −211 through −653 units utilize a
conventional reciprocating compressor. See ELEC-
TRICAL DATA tables or compressor nameplate for com-
pressor specifications.
HS29−024−3 and HS29−030 through −060 units utilize a scroll
compressor. The scroll compressor design is simple, efficient
and requires few moving parts. A cutaway diagram of the scroll
compressor is shown in figure 4. The scrolls are located in the
top of the compressor can and the motor is located just below.
The oil level is immediately below the motor.