
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 | With | ||
| |||
Level 2 On | 55 (sizes | 61 | |
Level 2 Off | 45 | 57 | |
Level 3 On | 65 | 68 | |
Level 3 Off | 55 | 62 |
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 | 48/50PG16 | ||||||
Standard Unit | Standard Unit | Standard 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 | With | ||
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 | 2 | 2 | ||
| ||||
3 | 1,2 | 2, 3 | 1, 2 | |
1, 2, 3 (PG28) | ||||
|
|
|
20