Carrier 48/50PG C03-14, 48/50PM C16-28 manual Outdoor Fan Level Transitions

For 48/50PG03−07 units, one outdoor fan is controlled in all modes by the MotormasterR sensing on circuit A.

For 48/50PG08−14 units, 2 outdoor fans are controlled in all modes by the Motormaster sensing on circuit A.

For 48/50PG16 units, 3 outdoor fans are controlled in normal cooling and sub−cooling Reheat1 modes by the Motormaster sensing circuit A. Two of the fans are additionally controlled with OFC.1 output, based on outdoor temperature, during the hot−gas Reheat2 mode (level 1 = 1 fan, level 2 = 3 fans).

For 48/50PG20−28 and 48/50PM16−28 units, contactor OFC1 controls power to the Motormaster which controls OFM1 and OFM4. Contactor OFC2 controls the remaining two fans (16 and 20 size) or remaining 4 fans (24 and 28 sizes).

48/50PG and PM

Table 5 – Outdoor Fan Level Transitions

FAN LEVEL	OUTDOOR TEMPERATURE (F)
	Without Humidi-MiZer™ System	With Humidi-MiZer System
Level 2 On	55 (sizes 03-20), 45 (sizes 24-28)	61 (PG03-16, sizes 24-28), 68 (size 20, PM16)
Level 2 Off	45 (PG03-16), 50 (size 20, PM16), 40 (sizes 24-28)	57
Level 3 On	65	68 (PG03-16, size 24-28), 88 (size 20, PM16)
Level 3 Off	55	62 (PG03-16, size 24-28), 78 (size 20, PM16)

NOTE: Where not specified, the models are both PG and PM. Levels 0 and 1 are only in play if the OAT is lower than the Level 2 On temperature and the pressure is not above its respected max.

Table 6 – 48/50PG03−16 Fan Level Control of Fans and Contactors

FAN LEVEL	48/50PG03-07		48/50PG08-14		48/50PG16
	Standard Unit	Humidi-MiZer Unit	Standard Unit	Humidi-MiZer Unit	Standard Unit	Humidi-Mizer Unit
0	OFF	OFF	OFF	OFF	OFF	OFF
	OFC1 On	Motormaster	OFC1 On,	Motormaster	OFC1 On,	Motormaster, OFC1
1			OFC2 Off		OFC2 Off	Off
	Low Speed	Fan 1		Fan 1 and Fan 2
			Fan 1 On		Fan 1 On	Fan 2
	OFC1 Off		OFC1 On,		OFC1 On,	Motormaster, OFC1
2		N/A	OFC2 On	N/A	OFC2 On	On
	High Speed
			Fan 1 and 2 On		Fan 1, 2, 3 On	Fan 1, 2, 3
3	N/A	N/A	N/A	N/A	N/A	N/A

Table 7 – 48/50PG20−28 and PM16−28 Fan Level Control of Outdoor Fan contactors (OFC(X))

FAN LEVEL	With Humidi-MiZer System		With Humidi-MiZer System
	Circuit A	Circuit B	Circuit A and B
0	-	-	-
1	1	3	1
	1, 3 (PG28)
2	1,2 (20, PM16)	2, 3 (20, PM16)	1, 2 (20, PM16)
	2 (24-28)	2 (24-28)	2 (24-28)
3	1,2	2, 3	1, 2
	1, 2, 3 (PG28)

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