Lennox MMDB Service Manual

50
9.9. MLB Multi-Zone Specications (1.5 - 3 Ton)
Nominal Size - Tons 1.5 2.5 3
Outdoor Unit Model No. MLB018S4M MLB030S4M MLB036S4M
Number of Zones 2 Up to 3 Up to 4
Ambient Temperature Range - °F
Cooling –22 - 122 –22 - 122 –22 - 122
Heating –22 - 86 –22 - 86 –22 - 86
Sound Data (dBA) 61 63 63
Refrigerant Charge furnished (R-410A) 5 lbs. 11 oz.. 8 lbs. 6 oz.. 10 lbs. 2 oz..
Maximum line length with furnished charge (per zone) - ft. 25 25 25
Additional charge required per ft. - oz. 0.16 0.16 0.16
Compressor
No. and Type (1) Rotary (1) Rotary (1) Rotary
Refrigerant oil type VG74 VG74 VG74
Refrigerant oil charge - oz. 21 33.8 47.3
Connections - in. Liquid+Gas pipe (are) (2) 1/4 liq. + (2) 3/8 gas (3) 1/4 liq. + (3) 3/8 gas
(3) 1/4 liq. + (3) 3/8 gas
(1) 1/4 liq. + (1) 1/2 gas
Maximum pipe length for all rooms - ft. 131 197 262
Maximum pipe length for one indoor unit - ft. 82 98 115
Max. height difference between indoor and outdoor units - ft. 49 49 49
Max. height difference between indoor units - ft. 33 33 33
Outdoor
Fan
(No.) Diameter - in. (1) 21 (1) 22 (2) 22
Total air volume - cfm 2130 2150 4500
rpm 1050 / 900 / 850 1000 / 900 / 750 800 / 700 / 600
Outdoor Coil
Number of rows 2 2.6 2
Fins per inch 18 16 18
Fin type Hydrophilic aluminum
Tube outside diameter - in.
3/8 3/8 3/8
Tube type Ried copper tubing
Net face area - ft.2
8.18 8.16
6.54
Application area - sq. ft.
235 - 345 355 - 515 690 - 1010
Design Pressure PSIG 540 / 340 540 / 340 550/340
Shipping Data Net/Shipping weight (lbs.) 138 / 149 168 / 180 239 / 270
ELECTRICAL DATA
Electrical Characteristics - 60 Hz - 1 Phase 208/230V 208/230V 208/230V
2
Maximum Over-current Protection (amps) 25 40 50
3
Minimum circuit ampacity 20 25 35
Outdoor Fan Motor
Rated load amps 0.9 1.3 (2) 0.39
Output - W 120 120 (2) 85
NOTE - Per AHRI, the certied ratings for systems are valid for all combinations of indoor units with the specic outdoor units listed above and in the AHRI Directory of
Certied Equipment. Please visit http://www.ahridirectory.org for further details and latest updates.
1
Ratings are AHRI certied to AHRI Standard 1230-2010 with Addendum 2;
• Cooling Ratings - 80°F dry bulb/67°F wet bulb entering indoor coil air and 95°F dry bulb/75°F wet bulb outdoor air temperature.
• High Temperature Heating Ratings - 70°F dry bulb/60°F wet bulb entering indoor coil air and 47°F dry bulb/43°F wet bulb outdoor air temperature.
• Low Temperature Heating Ratings - 70°F dry bulb/60°F wet bulb entering indoor coil air and 17°F dry bulb/15°F wet bulb outdoor air temperature.
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type circuit breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
NOTE - Adaptors are furnished for the gas pipe connections:
036 - (3) 3/8 x 1/2 in. and (1) 1/2 x 3/8 in.
048 - (3) 3/8 x 1/2 in., (2) 1/2 x 3/8 in., (2) 1/4 x 3/8 in. and (2) 1/2 x 5/8 in.

Lennox MMDB Specifications

General

Brand	Lennox
Model	MMDB
Category	Air Conditioner
Language	English