Replacing Steam and Hot Water Coils in McQuay Equipment
When the temperature drops, coil calls go up. Steam and hot water coils in fan coils, air handlers, unit ventilators, and hydronic PTACs fail most often in cold weather. Air Distributors supplies coils for McQuay and Daikin Applied equipment.
Why coils fail
- Freezing. A coil exposed to cold outdoor air, through a stuck damper or a fan that keeps running when the heat is off, can freeze and split.
- Water hammer and condensate in steam coils. Poor drainage leaves condensate in the coil, which damages tubes.
- Corrosion. Water chemistry and age wear tubes from the inside.
- Physical damage during service.
Coil types we supply
- Steam coils
- Hot water coils
- Chilled water coils
- DX coils
- Coaxial coils for water source heat pumps
- Reheat and preheat coils
Coated coils are available for corrosive environments.
What to send
- The equipment model and serial number. This is how the original coil is identified.
- Coil type, and number of rows if known
- Connection sizes and which side they are on
- Photos of the coil and its connections
Prevent the next one
- Check outdoor air dampers and freeze protection before winter.
- Confirm steam traps and condensate drainage work.
- Keep a spare coil on hand for equipment that has failed before.
Hydronic PTACs need more than a coil? Applied Comfort builds hydronic replacement chassis for many legacy sleeves. See 42 x 16 hydronic PTACs and the McQuay coils page.
Send the model and serial number through the contact form or call 800-866-1210.