Chilled Water Coil Piping
Chilled water coil connections are 3/4 inch nominal (7/8 OD) copper on the 8/12VMB-HW and 1 inch nominal (1-1/8 OD)
copper on the 16/20VMB-HW.
All piping should be copper and should not exceed 200 feet of total piping. It is recommended that 3/4 nominal (7/8 OD)
piping should be used on the 8/12VMB-HW units and 1 nominal (1-1/8 OD) on the 16/20VMB-HW unit to prevent excessive
head pressure losses. (Consult the factory for other piping applications.)
CAUTION:
When connecting piping to fan coil units, do not bend or reposition the coil header tubing for
alignment purposes. This could cause a tubing fracture resulting in a water leak when water pressure is
applied to the system. Failure to follow this CAUTION could result in personal injury or product and property
damage.
Chilled water coil sweat connections:
1. Review water coil piping precautions.
2. Insert water lines into water coil headers.
3. Solder copper joints with low temperature - non lead solder.
4. When all connections are complete, pressure test the system with water. Repair any solder joint leaks and gently
tighten any leaking valve packing nuts and piping accessories as required.
It is also required that all chilled water piping be adequately insulated to prevent condensation and heat gain. Failure to follow
this could result in product and property damage.
CAUTION: Hydronic systems are not designed to hold pressurized air and should only be tested with water.
Failure to follow this CAUTION could result in personal injury or product and property damage.
Hot Water Coil Piping
Hot water coil connections are 3/4 inch nominal (7/8 OD) copper except the 20MB-HW is 1 inch nominal (1-1/8 OD).
The hot water supply to the fan coil will be on the right when facing the fan coil upright and from the front.
All piping between the water heater and fan coil unit should be copper and should not exceed 200 feet of total piping. It is
recommended that 3/4 nominal (7/8 OD) piping should be used on 8 thru 16MB-HW units and 1 nominal (1-1/8 OD) on
20MB-HW unit to prevent excessive head pressure losses. (Consult the factory for other piping applications.)
CAUTION: When connecting piping to fan coil units, do not bend or reposition the coil header tubing for
alignment purposes. This could cause a tubing fracture resulting in a water leak when water pressure is
applied to the system. Failure to follow this CAUTION could result in personal injury or product and property
damage.
Hot water coil sweat connections:
1. Review hot water coil piping precautions.
2. Insert water lines into hot water coil headers.
3. Solder copper joints with low temperature - non lead solder.
4. When all connections are complete, pressure test the system with water. Repair any solder joint leaks and gently
tighten any leaking valve packing nuts and piping accessories as required.
It is also recommended that all piping be adequately insulated to prevent freezing when piping is run in an unconditioned space.
Failure to follow this could result in product and property damage due to frozen water line breakage.
CAUTION: Hydronic systems are not designed to hold pressurized air and should only be tested with water.
Failure to follow this CAUTION could result in personal injury or product and property damage.
NOTE:
Hot water coil freeze protection is available for applications where the fan coil is located in ambient air locations (attics,
crawl spaces, etc.) or within structures that may be unoccupied during freezing conditions. Consult the factory for additional
information.
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