Sanyo R410A operation manual 16/18

3. TEST OF THE SYSTEM AND CONTROL OF THE AIR VOLUME TO THE OUTLET GRILLES

The unit is prearranged to supply an external static pressure of about 5 mm. Too high resistances in the air distribution system can cause an exceedingly small air volume to the outlet grilles.

This trouble can be solved by increasing the fan speed as follows:

Open the cover of the electrical junction box. Take out the booster cable clamped in the box. (fig. 3-1)

Disconnect the fan motor plug in the electrical box and insert the booster cable as a cable extension between the motor plug and the socket from the PCB. The external static pres- sure will increase to 7 mm w.g. Check static pressure and air flow rate on the fan performance graph. (fig. 3-2)

Fig. 3-1

Booster cable

Booster cable

Fan motor

Fan motor

Connector motor cable (at the supply)

Fig. 3-2

H = High fan speed

L = Low fan speed

HH= Very high fan speed M = Middle fan speed

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(mmW.G.)	8
PRESSURE	6
STATIC					HH
	4		M	H
EXTERNAL
		L
	2
	0
	300	500	700	900	1100	1300	1500

m3/h

			12
	10
(mmW.G.)	8
PRESSURE	6
				HH
STATIC
	4			H
EXTERNAL			M
			L
	2
	0
	200	400	600	800	1000
					m3/h

PH: Standard supplied unit. Available fan speeds: Low-Midd- le-High (L - M - H). Max. static pressure: about 5 mm

HH:Unit with cable extension of the fan motor (booster cable). Available fan speeds: Middle-High-Very high (M - H - HH). Max. static pressure: about 7 mm

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