Lennox Diplomat 10HP12, Информация

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Page 3
A – Control Box (Figure 2)
FIGURE 2
DUAL CAPACITOR
(C12)
START CAPACITOR
(C7)
POTENTIAL
RELAY (K31)
COMPRESSOR
CONTACTOR
(K1)
10HP UNIT CONTROL BOX
GROUNDING
LUG
DEFROST
RELAY (K4)
DEFROST
CONTROL
CMC1
LOW VOLTAGE
MAKEUP AREA
TIMED OFF
CONTROL (A4)
10HP60 ONLY
A low voltage make up area is provided for thermostat
field wiring. Field thermostat wiring is made to color
coded pigtail connections as illustrated in figure 3.
FIGURE3
THERMOSTAT WIRING IDENTIFICATION
BLACK
BEIGE
ORANGE
YELLOW
RED
FROM OUTDOOR UNIT
TO INDOOR UNIT/
THERMOST
A
T
24V (POWER) INPUT
TO OUTDOOR UNIT
(COMPRESSOR)
(REVERSING VALVE)
(ELECTRIC HEAT)
(COMMON)
INPUT
INPUT
DEFROST OUTPUT
DANGER
Shock Hazard
All 10HP units use single-pole
contactors. One leg of compressor,
capacitor and outdoor fan are
connected to line voltage at all
times. Potential exists for electrical
shock resulting in injury or death.
Remove all power at disconnect
before servicing.
Can cause personal injury or death.
1 – Compressor Contactor K1
The compressor is energized by a contactor located in
the control box. See figure 2. Contactors are SPST in
single phase units and 3PST in three phase units. K1 is
energized by the indoor thermostat terminal Y (24V).
10HP units are not equipped with a line voltage to 24V
transformer. All 24 VAC controls are powered by the
indoor unit. Refer to unit wiring diagram.
2 – Dual Capacitor C12
The compressor and fan in 10HP units use permanent
split capacitor motors. The capacitor is located inside the
unit control box (see 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
compressor side of the capacitor have different MFD
ratings. See table 1 for dual capacitor ratings.
TABLE 1
Unit MFD VAC
10HP (C12) DUAL CAPACITOR RATING
10HP18, 24 and
30-2
10HP42
10HP48 and 60
5
35
5
45
10
370
10
40
60
Terminal
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM
440
10HP12
5
25
FAN
HERM
10HP30-1 and 36
10HP36-4
FAN
HERM
5
40
3 – Potential Relay K31 (Start)
All 10HP units use a potential relay which controls the
operation of the starting circuit. The potential relay is
located inside the unit control box (see figure 2). The
relay is normally closed when contactor K2 is
de-energized. When K1 energizes, the compressor
immediately begins start-up. K31 remains closed
during compressor start-up and start capacitor C7
remains in the circuit. As the compressor gains speed,
K31 is energized. When K31 energizes, the contacts
open and start capacitor C7 is taken out of the circuit.
4 – Start Capacitor C7
All 10HP units use a start capacitor (C7). C7 is located
inside the unit control box (see figure 2). C7 is wired in
parallel with the compressor side of the dual
capacitor. See table 2 for start capacitor ratings.
TABLE 2
Unit MFD VAC
10HP START CAPACITOR RATING (C7)
10HP12, 18 and 24
10HP36-4
10HP42 and 48
88–108 250
189-227 330
10HP36 (CAN)
10HP30-1 and 36 88–108 330
250 88–108
10HP30-2 145–175 330
10HP60 270-324 330
5 – Timed Off Control A4
A timed off control (A4) located in the control box is
used on 10HP60 units. See figure 2. The time delay is
electrically connected between thermostat terminal Y
and the compressor contactor. After cooling demand
has stopped, A4 begins counting for five minutes.
During the timing period, A4 disables the compressor
contactor. Thermostat demand will have no effect on
the unit.The unit cannot operate. After the delay, the
compressor contactor can be energized.