Lennox MMA018SM4 Service Manual page 27

No. Dial Code Control
Scenario
7 SW2-4 2
8 Rotary 2
Switch S3
9 SW3-1 1
10 SW3-2 1
11 SW3-3 1
12 SW3-3 2
13 SW3-4 1,3
14 SW4 1,2,3
15 S4-1 1,3
16 S4-2 1,3
24V Thermostat,
S1 + S2
Control Scenario Wired Controller
S1 + S2
Full 24V
Function
Compressor/Auxiliary heat outdoor ambient
lockout
Set outdoor temperature Limitation (for auxiliary
heating or compressor)
Maximum continuous runtime allowed before
system automatically stages up capacity to
satisfy set point. This adds 1 to 5°F to the
user set point in the calculated control point to
increase capacity and satisfy user set point
Cooling and heating Y/Y2 temperature
differential adjustment.
Compressor Running (demand working with
heat pump+ Electric heat)
Temperature differential to activate second
stage auxiliary heating(the GAP of T1 and Ts)
Wire controller demand with heat pump+Electric
heat working together
Fan speed of cooling mode when 24V
Thermostat is applied for.
Electric heat nominal CFM adjustment
Default ON
DH function selection
1
2
3
ON
The compressor
will not operate
if the outdoor
temperature is
lower than the
temperature
represented by S3
0 means that the temperature protection
is not turned on, the dial range is 1
through F, 1 equals -4°F and it increase
up to 46°F. See "Table 2. Dial Range
Table" on page 29.
30 minutes
Compressor
slower speed
Compressor
slower speed
4°F (2°C)
Turbo
Available settings are 000/001/010/011.
Each digit corresponds an individual
switch position.
For example [SW4-1 OFF, SW4-2 ON,
SW4 -3 OFF] = 010
[Default] For
single stage
supplemental heat,
W1 and W2 are
connected
[Default]
Dehumidification
control not
available
S3
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Table 3.
27
OFF Note
[Default] The SW2-4 and S3
heater will need to working
not operate if together
the outdoor
temperature is
greater than
the temperature
represented by S3
[Default] 90
minutes
[Default] Faster Only affects
Compressor compressor
[Default] Faster Only affects
Compressor compressor and
W2
[Default] 6°F (3°C)
High
For dual stage
supplemental
heat, W1 and W2
are controlled
independently
Dehumidification
feature is enabled
through thermostat
S3 (°F) S3 (°C)
OFF OFF
-4 -20
0 -18
3 -16
7 -14
10 -12
14 -10
18 -8
21 -6
25 -4
28 -2
32 0
36 2
39 4
43 6
46 8
Dial Range Table