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Figure 25a. Water Connection - Valve Open (TSDC Only) Figure 25b. Water Connection - Valve Closed (TSDC Only)
Bleed
Valve
Valve
Open
Valve
Closed
Bleed
Valve
Discrete Spray Connection
The discrete spray connection offers a water by-pass connection in case of pump failure.
The connection is made for a standard garden hose and is not designed to hold weight
such as attached piping. For the TSDC only, in case of pump failure, turn the pump valve
to the horizontal (closed) position in order to isolate the pump and divert water flow.
Unit Operation
Modes of Operation
Self-Clean Cycle
Winter Operation
Coil Freeze Protection
Minimum Operation
Emergency Coil Drain
Discrete Spray Connection
Discrete Spray
Connection
Make-up Pressure
Balancing Valve
Figure 26. Manual Discrete Connection for the TSDC2 and TSDF2 (Garden Hose Connection)
Make-up Valve
Strainer (Optional)
Model Number
Heat LossData
(BTU/HR)
1
TSDF2-WG-22S-12.4 2,951,500
TSDF2-WG-22L-12.4 2,993,180
TSDF2-WG-23M-18.6 4,447,840
TSDF2-WG-23R-18.6 4,511,940
TSDF2-WG-24D-24.8 5,893,040
TSDF2-WG-24S-24.8 6,024,400
NOTE: Heat loss data based on
102°F (39°C) entreing coil water,
nominal flowrate and -10°F (-23°C)
ambient air temperature with a
45MPH (72 km/hr) wind velocity.
Fans and pump are off.
Model Number
Heat LossData
(BTU/HR)
1
TSDF2-WG-25D-31.0 7,438,720
TSDF2-WG-25M-31.0 7,520,760
TSDF2-WG-26T-37.2 8,854,240
TSDF2-WG-26D-37.2 8,974,820
TSDF2-WG-27T-43.4 10,389,840
TSDF2-WG-27D-43.4 10,511,320
Minimum Operation
When a glycol solution is not utilized, operate the system to meet the following conditions.
• Maintain the minimum recommended flow through the unit coils at all times.
• Maintain a minimum heat load on the circulating fluid so that the temperature of the fluid leaving
the coil is not less than 50°F (10°C). To maintain the leaving fluid temperature at 50°F (10°C) when
the process load is extremely light or shut off, apply an auxiliary heat load to the circulating fluid and
adjust the flow to ensure that fluid leaving the coil maintains the minimum required temperature.
Emergency Coil Drain
Do not drain the coils as a normal method of freeze protection. Frequent draining promotes
corrosion inside the coil tubes. However, draining is acceptable as an emergency method of freeze
protection if the coils are not protected by a glycol solution. If the coils are not protected, automatic
drain valves and vacuum breakers are recommended to drain the coils if flow stops or the fluid
temperature drops below 50°F (10°C) when the ambient temperature is below freezing. Further
protection against coil freeze-up is possible with the installation of an alarm to alert personnel when
the temperature of the fluid leaving the coils falls below 50°F (10°C). Contact your local
BAC Representative for guidelines on the installation of an emergency coil drain system.
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