- RTUD uses the CGAM fan control
- The core design is the based on RTAC chiller design
- RTUD maintains a minimum of 60 psid
Recommended Fan Control when paired with a Trane Condenser
3 Fan Standard #1
3 Fan Standard #1
- Relay 1 = 1 Fan
- Relay 2 = No Fan
- Relay 3 = 1 Fan
- Relay 4 = 1 Fan
(3 fans total)
| Stage | Number of Fans | Relays Energized | Min. Capacity [%], Pct. Capacity [%] | |||
| 1 | 2 | 3 | 4 | |||
| 0 | 0 | 0 | 0 | 0 | 0 | -1, 0 |
| 1 | 1 | 1 | 0 | 0 | 0 | -1, 33.333 |
| 2 | 2 | 1 | 0 | 1 | 0 | -1, 66.667 |
| 3 | 3 | 1 | 0 | 1 | 1 | -1, 100 |
4 Fan Standard #1
4 Fan Standard #1
- Relay 1 = 1 Fan
- Relay 2 = No Fan
- Relay 3 = 1 Fan
- Relay 4 = 2 Fans
(4 fans total)
| Stage | Number of Fans | Relays Energized | Min. Capacity [%], Pct. Capacity [%] | |||
| 1 | 2 | 3 | 4 | |||
| 0 | 0 | 0 | 0 | 0 | 0 | -1, 0 |
| 1 | 1 | 1 | 0 | 0 | 0 | -1, 25 |
| 2 | 2 | 1 | 0 | 1 | 0 | -1, 50 |
| 3 | 3 | 1 | 0 | 0 | 1 | -1, 75 |
| 4 | 4 | 1 | 0 | 1 | 1 | -1, 100 |
5 Fan Standard #1
5 Fan Standard #1
- Relay 1 = 1 Fan
- Relay 2 = 1 Fan
- Relay 3 = 1 Fan
- Relay 4 = 2 Fans
(5 fans total)
| Stage | Number of Fans | Relays Energized | Min. Capacity [%], Pct. Capacity [%] | |||
| 1 | 2 | 3 | 4 | |||
| 0 | 0 | 0 | 0 | 0 | 0 | -1, 0 |
| 1 | 1 | 1 | 0 | 0 | 0 | -1, 20 |
| 2 | 2 | 1 | 0 | 1 | 0 | -1, 40 |
| 3 | 3 | 1 | 1 | 1 | 0 | -1, 60 |
| 4 | 4 | 1 | 1 | 0 | 1 | -1, 80 |
| 5 | 5 | 1 | 1 | 1 | 1 | -1, 100 |
RTUD – Condenser Fan Configuration
RTUD – Condenser Fan Configuration
- Select Fan Control
- Ambient Option
- None
- Variable
- Two Speed
- Select Fan Configuration
- Number of Fans
- Relay Configuration
- Sequence 1
- Two Speed (Not used on Trane Condenser)
- Sequence 2
- Used for Trane Condensers
- Sequence 1
The character in the 4 digit descriptor define the number of fans that wired to each of the 4 condenser fan relays
Two possible 5 fan arrangements
- First sequence 1 H 1 3.
- There should be 1 fan wired to relay 1 (terminals J2-1,3 of module 1A25 – Circuit 1 Fan Quad LLID
- Digit 2 in the sequence H, is only for use with the High speed of a 2 speed fan configuration
- If unit was not selected for low ambient options it is not to be used and nothing should be wired to the 2nd relay
- 3rd and 4th digits imply the number of fans that are to be wired to the 3rd and 4th relays
- The second alternative wiring for a fixed speed 5 fan deck is the 1112 selection
- This scheme, the first 3 relays should all be wired to control one fan
- Last relay should control 2 fans