TM9-4120-400-14
4-47.
LOW PRESSURE CUTOUT SWITCH (LPCO) BYPASS. - continued
Figure 4-42. Bypass LPCO Switch
INSTALLATION
1. Tag and disconnect wire lead from low pressure cutout switch (S5) terminal 2.
2. Tag and disconnect wire lead from high pressure cutout switch (S4) terminal 2.
3. Connect wire lead disconnected in step 1 above to high pressure cutout switch (S4) terminal 2.
4. Connect wire lead disconnected in step 2 above to low pressure cutout switch (S5) terminal 2.
5. Remove tags.
6. Fabricate CAUTION tag (shown below) and place on control panel to show that low pressure cutout switch has
been bypassed.
Air conditioner low pressure cutout switch (S5) has been bypassed to permit operation in
cool mode at temperatures below 0F (-17.8C).
Compressor will not shut off under low suction pressure conditions.
Rewire the pressure cutout switches (S4 and S5) per wiring diagram when outside air
temperature increases to 40F (5C).
CAUTION TAG EXAMPLE
NOTE
FOLLOW-ON MAINTENANCE:
Install junction box (para 4-27).
4-114
