Quick Start Guide
LINE-SET SIZE BY TONNAGE
WIRING
In cooling R, C, Y1 is needed at a minimum to run system. Add in O for heating operation, and W to operate electric
heating while in defrost.
Optional wiring: By also connecting Y2 you’ll get enhanced control over compressor ramp up / down rather than relying
solely on the suction pressure/temperature and outdoor ambient temperature inputs.
H
I
G
H
E
F
F
I
C
I
E
N
C
Y
1
8
S
E
E
R
© 2021 Allied Air Enterprises LLC, A Lennox International Inc. Company
Printed in the U.S.A. DC-LX_QSG_900 (06/21)
Standard Refrigerant Line Set - Up to 50 Linear Feet in Length
Tonnage*
Valve Size Connections Recommended Line Sets
Liquid Line Suction Line L15 Line Set Model Line Set Length
-024
3/8” (10mm)
3/4” (19mm)
L15-41-30 30’ (9.1m)
-036 L15-65-40 40’ (12.2m)
-048 7/8” (22mm) L15-65-50 50’ (15.2m)
-060 1-1/8” (29mm)** Field-fabricated
* Applicable to all minor revision numbers unless otherwise specified. ** Some applications may require a field-provided 1-1/8” to 7/8” adapter.
4HP18V Line Set Guidelines - 51 to 150 Linear Feet in Length
Tonnage
Max Total
Equivalent
Length (ft)
Max Linear
(actual) Length
(ft)
Max Vapor Riser
(ft)
Max Linear
Liquid Lift (ft)
Preferred Vapor
Line Sizes for
Horizontal Runs
Required Vapor
Riser Size
-024
180 150 60 60 7/8”
5/8”
-036
3/4”
-048
7/8”
-060
PROGRAMING UNIT TYPE ON 18 SEER HP
1. Press and hold SW1 button on outdoor unit board until the single dash line (-) appears on display and release it.
2. Press and hold the SW1 button again until PU is displayed and release SW1.
3. Press and hold the SW1 button again until the correct unit type is displayed (58 = 2 Ton,60 = 3 Ton,62 = 4 Ton,63 = 5
Ton) and release SW1.
4. The unit will display the unit type for 10 seconds and you must press SW1 button and hold it for 3 seconds and the
unit will store the unit type.
To Previous Page
Loading...
