Chilled Water Coil Equipped Units (Optional); Evaporative Cooler Equipped Units (Optional) - Trane GRAA Installation, Operation And Maintenance Manual

I I n n s s t t a a l l l l a a t t i i o o n n

Chilled Water Coil Equipped Units (Optional)

See Coil Installation/Maintenance Manual for General Coil Piping Recommendations. Remove
the coil cabinet door and cut holes in door to allow chilled water piping passage. Provide
weatherproof seal around chilled water pipes at piping plate when installed.
The Chilled Water Coil has a 600 ft/min (3.048 m/s) maximum velocity through the coil
requirement. This is due to prevention of condensate blow-off. To calculate the velocity through
the coil apply the following formula:
Condensate Drain piping must have a P-trap in line immediately downstream of drain pan
connection, external to the unit, to prevent possible outside air leakage into unit. The P-trap shall
be of sufficient differential to overcome negative pressure of the indoor air blower. A minimum
height difference of 2 inch is required (See
P-trap with either water (summer) or glycol (winter).
Figure 12. Drain Pan Connection

Evaporative Cooler Equipped Units (Optional)

Refer to Evaporative Cooler Installation and Service Manual for water and electrical connections.
28
Unit
Housekeeping
Pad
Total Height Of Trap = X+ H + (1-1/2 X Pipe Diameter)
(without Insulation)
Figure 12, p. 28). Before unit operation begins, prime
H
Total
Height
of Trap
X
MUA-SVX003B-EN