Heat Controller VMC09SB-1/VMH09SB-1 service manual DC Peak control, Discharge Pipe Temp Control

Part 2 Functions & Controls

5.10 DC Peak control

5.10.1 DC Peak Current Error by a fault signal of IPM

•If the operating current of IPM reaches 35A ±3A, the compressor stops instantly.

•If DC PEAK occurs 5 times within 1 hour, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error Code 21(18,24,30kBtu/h Model).

5.10.2 DC Peak Current Error by the compressor lock

•If the DC LINK voltage is below DC 140V and this occurs 5 times within 1 hour while the compressor is operating, the appliance turns off and display Error Code 6(9k,12k Model) / Error Code 23(18k,24k,30k Model).

5.10.3 DC Peak Current Error by the Outdoor Fan Lock

•If this problem occurs 5 times within 1 hour in case of the temperature of outdoor pipe thermistor is over 65°C(149°F) while the compressor is operating, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error Code 61(18,24,30kBtu/h Model).

5.11 Discharge Pipe Temp Control

5.11.1 9,12kBtu/h Model

•If the temperature of the discharge pipe of compressor reaches over 130°C(266°F) or below -30°C(-22°F) the com- pressor stops instantly.

•The compressor's operating frequency is limited according to the compressor dome thermistor. (Refer to below Fig.)

•Temperature range of COMP SPEC varies by 10°C(50°F).

Discharge pipe temp.					∆T = (T off - T2)/2
T off °C					T1 = T2	- 2 * ∆T
					T3 = T2	+ ∆T
T3 °C
T2 °C
T1 °C
-13 °C(8.6°CF)
COMP Freq. Fh min	Free	Fc-1	Fc-2	OFF	Fc-2	Fc-1	Free

Toff : 110°C(230°F) T2 : 100°C(212°F)

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Only for training and service purposes