Toshiba CEILING TYPE, CONCEALED DUCK TYPE service manual Temperature in heating

No.	Item		Outline of specifications					Remarks
3	Room temp.	2)	Using the CODE No. 06, the setup temperature in heating					Shift of suction
	control		operation can be corrected.					temperature in heating
	(Continued)							operation
			SET DATA	0	2	4	6
			Setup temp.	+0°C	+2°C	+4°C	+6°C
			correction
			Setting at shipment
			SET DATA	2
4	Automatic	1)	Based on the difference between Ta and Ts, the operation
	capacity control		frequency is instructed to the outdoor unit.
	(GA control)	2)	Cooling operation
			Every 90 seconds, the room temperature difference
			between temperature detected by Ta and Ts and the
			varied room temperature value are calculated to obtain
			the correction value of the frequency command and then
			the present frequency command is corrected.
			Ta (n) – Ts (n) : Room temp. difference
			n	: Counts of detection
			Ta (n-1) – Ts (n)	: Varied room temp. value
			n – 1	: Counts of detection of 90 seconds before
		3)	Heating operation
			Every 1 minute (60 sec.), the room temperature differ-
			ence between temperature detected by Ta and Ts and the
			varied room temperature value are calculated to obtain
			the correction value of the frequency command and then
			the present frequency command is corrected.
			Ts (n) – Ta (n)	: Room temp. difference
			n	: Counts of detection
			Ta (n) – Ta (n – 1): Varied room temp. value
			n – 1	: Counts of detection of 1 minute before
		4)	Dry operation
			The frequency correction control is same as those of the
			cooling operation.
			However the maximum frequency is limited to approxi-
			mately “S6”.

Note) When LOW is set up, the maximum frequency is limited to approximately “SB”.

5 Automatic	1) The judgment of selecting COOL/HEAT is carried out as
cooling/heating	shown below. When +1.5°C exceeds against Tsh 10				Tsc: Setup temp. in
control	minutes and after thermo. OFF, heating operation				cooling operation
	(Thermo. OFF) exchanges to cooling operation.
					Tsh: Setup temp. in
	Description in the parentheses shows an example of
					heating operation
	cooling ON/OFF.
					+ temp. correction of
	Ta ˚C	Cooling			room temp. control
	+1.5
				(Cooling ON)
	Tsc or Tsh
			(Cooling OFF)
	–1.5
			Heating

When –1.5°C lowers against Tsc 10 minutes and after thermo. OFF, cooling operation (Thermo. OFF) exchanges to heating operation.

2)For the automatic capacity control after judgment of cooling/heating, see Item 4.

3)For temperature correction of room temp. control in automatic heating, see Item 3.

– 28 –