Cooling Sequence: Economizer Not Available; Heating Sequence; Staging; Adjusting Cooling Staging - Bard FUSION-TEC WR36BPA Service Instructions Manual

To enable this delay:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to Adv Sys
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to FC Comp.
Delay B7.
5. Press ENTER key to scroll to Enable (see Figure
21).
6. Press UP or DOWN key to change the value.
7. Press ENTER key to save value and move cursor to
Delay.
8. Press UP or DOWN keys to change the time value.
9. Press ENTER key to save value and move cursor to
top of the screen.
10. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 21
Enabling Free Cooling Delay
Cooling Sequence – Economizer Not Available
NOTE: This description is based on the example
shown in Figure 20 and Figure 23.
If the return air temperature is higher than 79°F
(Setpoint of 77°F + Stage 1 On Differential of 2°F),
the unit will enable mechanical cooling stage 1. If the
return air temperature is higher than 80°F (Setpoint
of 77°F + Stage 2 On Differential of 3°F), the unit
will enable mechanical cooling stage 2. Each stage
will then be disabled when the return air temperature
reaches the setpoint plus the stage off differential.

Heating Sequence

NOTE: This description is based on the example
shown in Figure 20 and Figure 23.
If the return air temperature is below 58°F (Setpoint
of 60°F + Stage 1 On Differential of -2°F), the unit
will enable electric heat stage 1. If the return air
temperature is below 57°F (Setpoint of 60°F + Stage
2 On Differential), the unit will enable electric heat
stage 2 (if available). Each stage will then be disabled
when the return air temperature reaches the setpoint
plus the stage off differential.

Staging

The unit will stage the cooling components based on
the cooling demand referenced in the temperature
control. The unit will stage the economizer on first if
the indoor and outdoor conditions are favorable. The
compressor stage 1 will be enabled next as the demand
increases. Finally, the compressor stage 2 will be
enabled as the demand continues to increase.
The unit is only equipped with one stage of heat and
will turn on based on the heating demand.
To view unit stages:
1. From the Status screen, press UP or DOWN key
until Quick Menu displays Unit Information icon
( ). Press ENTER key.
2. The cooling and heating demand are visible on
this screen. The unit stages will display here when
active as FC, CL1, CL2 or H1 (see Figure 22).
FIGURE 22
Viewing Unit Stages

Adjusting Cooling Staging

This unit uses staging differentials to control cooling
operation. The on differential for a stage references
the number of degrees above the setpoint at which
the stage turns on. The off differential for a stage
references the number of degrees below the setpoint at
which the stage turns off.
To adjust cooling stage differentials:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to Adv Sys
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to Cooling Setup
B4.
5. Press ENTER key to scroll to Stage 1 On
Differential (see Figure 23 on page 16).
6. Press UP or DOWN keys to adjust number of
degrees above setpoint to turn cooling operation on.
Manual 2100-695
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