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FIGURE 22
Adjusting Cooling Differential Values
Heating Sequence (see Figure 24)
If the return air temperature is below 58°F (Setpoint
+ Stage 1 Diff On), the unit will enable electric heat
stage 1. If the return air temperature is below 57°F
(Setpoint + Stage 2 Diff On), the unit will enable
electric heat stage 2. If the control value is below
56°F (Setpoint + Stage 3 Diff On), the unit will enable
electric heat stage 3.
To adjust these parameters:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to Sys Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Heating Setup
(A3); press ENTER key.
5. Press ENTER key to scroll to Stage 1 Diff On, Stage
1 Diff Off, Stage 2 Diff On, Stage 2 Diff Off, Stage
3 Diff On or Stage 3 Diff Off (see Figure 23).
Stage 1
Stage 2
Stage 3
55
NOTE: Stages available are based on unit configuration. Example: If only a single stage of heat is present, only a
single stage of heat will be considered for heating operation.
Manual 2100-725C
Page
16 of 39
FIGURE 24
MULTI-TEC Wall-Mount Unit Heating Staging
Stage 1 Diff On
Stage 2 Diff On
Stage 3 Diff On
Stage 3 Diff Off
56
57
58
6. Press UP or DOWN keys to adjust value.
7. Press ENTER key to save.
Adjusting Heating Differential Values
Free Cooling
If the unit is equipped with an economizer, and
conditions are acceptable for economizer operation,
the MULTI-TEC wall-mount unit will utilize free cooling
operation before the use of any cooling operation
requiring compressor operation to reduce the energy
required to cool the indoor space.
Economizer Disable
There are two methods to disable the economizer if
the use of free cooling is restricted. The first method is
to select None as the economizer type within the Sys
Config menu. The second method requires changing
the model number within the Adv Sys Config menu to
reflect a model installed with a blank-off plate (see
model nomenclature in Figure 1 on page 3). Changing
the wall-mount unit model number to reflect a unit with
a blank-off plate will not allow for an economizer type
Stage 1 Diff Off
Stage 2 Diff Off
Setpoint
59
60
61
On
Band
Off
FIGURE 23
62
63
64
65
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Troubleshooting
