Allied 4SCU14LB, Service Manual

Page: 3 / 43

508219-01 Issue 2132 Page 3 of 43
SOUND RATINGS
Model Sound Power
1
Estimated Sound Pressure (dBA)
2
Approximate Distance
3
3.3 Feet
(1 Meter)
6.6 Feet
(2 Meters)
9.8 Feet
(3 Meters)
4SCU16LE118P-50 70 62 56 52
4SCU16LE124P-50 77 69 63 59
4SCU16LE130P-50 75 67 61 57
4SCU16LE136P-50 78 70 64 60
4SCU16LE141P-50 74 66 60 56
4SCU16LE142P-50 77 69 63 59
4SCU16LE147P-50 79 71 65 61
4SCU16LE148P-50 76 68 62 58
4SCU16LE159P-50 77 69 63 59
4SCU16LE160P-50 78 70 64 60
1 Rated in accordance with AHRI standard 270 (2015). AHRI Standard 270 establishes a method of rating outdoor unitary equipment in terms of
Sound Power.
2 Rated in accordance with AHRI standard 275 (2010). AHRI Standard 275 provides the calculations for estimating the A-Weighted Sound Pressure
at a given distance from the equipment. That is a more useful number because that is what humans will hear.
3 Based only on distance factor; other factors may change this value such as:
- Unit location (reflective surfaces adjacent to the unit)
- Barrier shielding sources
- Sound path/elevation
- Outside noise sources
ACCESSORIES
System Accessory Where Used Kit Number Purpose
Liquid Line solenoid All models 60M52
Prevents liquid migration to the compressor especially for high liquid riser
applications
Low ambient (cooling operation) All models 34M72
Enables cooling demand down to 30 °F. Will require freeze stat, CC heater and
TXV
Compressor Short Cycle Protector All models 47J27 Delays compressor start 5-7 minutes to prevent short cycling
Hard Start 18 10J42
Scroll compressors usually do not require hard start; maybe needed for utility
brown-out or low voltage areas
Hard Start 24 thru 60 88M91
Crankcase Heater 18, 24, 30, 36 93M04
Prevents liquid migration to compressor in cold weather Crankcase Heater 41, 42 93M05
Crankcase Heater 47, 48, 59, 60 Factory Installed
Sound Cover Factory Installed Lowers compressor sound level
Loss of Charge Kit Factory Installed Protects the compressor if refrigerant charge is too low
Additional System Accessories (indoor section)
TXV Kit
18, 24, 30 H4TXV01
TXVs provide superior refrigerant flow control, comfort and efficiency compared
to pistons
36, 41, 42, 47, 48 H4TXV02
59, 60 H4TXV03
Outdoor Thermostat - electric heat All models 10Z23 Prevents electric heat operation above specific ambient conditions
Outdoor Thermostat - Mounting box All models 31461 Mounting box for outdoor thermostat
Freezestat All models 93G35 Protects the compressor at low suction pressure conditions
Overflow switch All models 11U75 Turn the system off, if condensate water overflows due to clogged drain pipes
Blower time delay All models 58M81 Improves system efficiency and comfort
Single point power supply All models 21H39 Provide single power source in one junction box
Auxiliary blower relay All models 85W66 Maybe required to select multiple indoor blower speeds