Coil Freeze Protection - BAC FXV-0806-12D Series Operation & Maintenance Manual

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Coil Freeze Protection

For protection against coil freeze-up, recommended solutions are an industrial grade
inhibited ethylene glycol or propylene glycol solution. When the use of glycol is not
practical, the system must be designed to meet both minimum flow and minimum
temperature requirements.
Coil volumes for FXV and FXV3 models can be found in the corresponding Engineering
Data section at www.BaltimoreAircoil.com. Coil volume for CXV and CXVT condenser
models using liquid cooling circuits is job specific.
Minimum Operation
When a glycol solution is not utilized, operate the system to meet the following conditions.
• Maintain the minimum recommended flow through the coil at all times (see Table 6).
• 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). For FXV/FXV3 Closed Circuit
Cooling Towers with glycol as the heat transfer liquid, maintain a minimum heat load
so that the temperature of the glycol leaving the coil is not less than 45°F (7.2°C).
(PFi).
• 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.
Model Number
FXV-0806x-xxD, FXV-0809x-xxD, FXV-0812x-xxD, FXV-0818x-xxD
FXV-0806x-xxT, FXV-0809x-xxT, FXV-0812x-xxT, FXV-0818x-xxT
FXV-0806x-xxQ, FXV-0809x-xxQ, FXV-0812x-xxQ, FXV-0818x-xxQ
FXV-0806x-xxh, FXV-0809x-xxh, FXV-0812x-xxh, FXV-0818x-xxh
FXV-1212x-xxD, FXV-1218x-xxD
FXV-1212x-xxT, FXV-1218x-xxT
FXV-1212x-xxQ, FXV-1218x-xxQ
FXV-1212x-xxh, FXV-1218x-xxh
FXV3-xxxx-xxD-xx
FXV3-xxxx-xxT-xx
FXV3-xxxx-xxQ-xx
Table 6. Minimum Coil Flow
Minimum Coil Flow (USGPM)
75
100
150
200
110
175
220
350
150
225
300