Heat Controller DMC12SB-0 Additional gas charging, The method of using graph, Gas leakage

Troubleshooting Guide

Additional gas charging

(Gas leakage)

•When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal oper- ating suction pressure.

•Use the graph or the equation below to get operating suction pressure according to indoor and out- door temperature.

Suction pressure was measured at 3-way valve service port after operating the unit for 10 minutes.

The method of using graph

-Find outdoor temperature.

-Find indoor temperature onto the curve of outdoor temperature.

-Read suction pressure at the axis of ordinates.

The method of using equation

-. Calculate suction pressure after putting indoor and outdoor temperature into the equation.

Operating Suction Pressure (For R410A)

(According to Indoor & Outdoor Temperature)

Suction Pressure (PSI)

	(At operating the Unit for 10 minutes)
184.9
170.7	122˚F
156.5	104˚F
142.2	86˚F
128	68˚F
113.8	50˚F
	0˚F

99.5

85

71.1

41 50 59 68 77 86 95 104

Indoor Temp. (˚F)

Outdoor Temp. (˚F)

Service Manual 49