Lennox PRODIGY2.0 User Manual

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5.5. Low Ambient Outdoor Fan Control and Cycling
During low ambient conditions, various outdoor fans are cycled by liquid line pressure switches; S11, S84, S85 and S94.
The M3 unit controller will also deenergize fans due to low outdoor temperature. See tables 17 through 21 for further
details.
Key: Description
A55 Prodigy 2.0 unit controller
A178 Panel, Compressor 3 and 4, C3 second stage heat
A187 Control General Purpose GP3
B4 Outdoor Fan 1 Motor
B5 Outdoor Fan 2 Motor
B21 Outdoor Fan 3 Motor
B22 Outdoor Fan 4 Motor
B23 Outdoor Fan 5 Motor
B24 Outdoor Fan 6 Motor
CP1 Compressor 1
CP2 Compressor 2
CP3 Compressor 3
CP4 Compressor 4
K1 Contactor, Compressor 1
K2 Contactor, Compressor 2
K10 Relay, Outdoor Fan 1
K14 Contactor, Compressor 3
M3 unit controller delays the fan for two seconds after thermostat
demand.
Fan energized when liquid pressure is higher than 450 psig
(HFC-410A); de-energized when liquid line pressure is less
than 240 psig (HFC-410A).
K68 Condenser fan 2 relay (PSC only)
K146 Contactor, Compressor 4
K149 Relay, Outdoor Fan 3
K150 Relay, Outdoor Fan 4
K152 Relay, Outdoor Fan 5
K153 Relay, Outdoor Fan 6
PWM Pulse Width Modulated signal from Prodigy 2 (ECM only)
40°F Prodigy 2 de-energizes fan below 40°F / 4.4°C
55°F Prodigy 2 de-energizes fan below 55°F / 13°C
S11 Refrigeration circuit 1 liquid pressure switch
S84 Refrigeration circuit 2 liquid pressure switch
S85 Refrigeration circuit 3 Liquid pressure switch
S94 Refrigeration circuit 4 Liquid pressure switch
5.5.1. Energence A Box Standard, High and Ultra-High Efficiency Units (3-, 4-, 5- and 6-Ton)
Table 17. Low Ambient Fan Operations (A Box Standard and High Efficiency Units)
Models Fan
Associated
Compressor
Fan Control
LCH, LGH 036S, 048S, 060S and 072H
1 1 Fan Control - On with S11
Table 18. Low Ambient Fan Operations (A Box High and Ultra-High Efficiency Units)
Models Fan
Associated
Compressor
Low Ambient Control
OD Temp < 62°F
LCH, LGH 036H/U, 048H/U, 060H/U and
074H/U
1 1 - On with S11
1
(B4)
S11
Condenser Fans
COMPRESSOR
1
CP1−A55−PWM2
A55−K1
A BOX
Gas / Electric & Electric /
Electric
LC/LG 036H/U 3 TON
LC/LG 048H/U 4 TON
LC/LG 060H/U 5 TON
LC/LG 074H/U 6 TON
A BOX
Gas / Electric & Electric /
Electric
LC/LG 036S 3 TON
LC/LG 048S 4 TON
LC/LG 060S 5 TON
LC/LG 072H 6 TON
1
(B4)
S11
Condenser Fans
COMPRESSOR
1
CP1−A55−K10
A55−K1

Lennox PRODIGY2.0 Specifications

General

Brand	Lennox
Model	PRODIGY2.0
Category	Controller
Language	English