73
V-250 R-404A Conversion Instructions
This option should be only used with units containing a low
voltage board. (2C20447G01). Service parts # 41-1812 with
cycle clutch on high/low pressure cutout operation.
1. Install new expansion valve.
2. Install new high pressure cutout switch.
3. Apply R-404A decals over the R-134a decals.
4. Change switches in back of cab control box. Move
switches 1 and 2 to the ON position. This will allow the
thermostat to be set to -24 F (-31 C).
5. Run drain tube heaters into drain hoses until about 6
inches of wire remains out. Keep wires to top side of
drain hoses and slip hoses over the drain tubes coming
out of the evaporator.
6. Unplug the defrost solenoid from the low voltage con-
trol. Plug drain tube heater harness into control box
plug and defrost solenoid into heater harness. Run
heater harness to evaporator and plug drain tube heaters
into harness.
12
ON XX
OFF
1. Drain Hose
2. Drain Pan
3. Heater
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