Dx Coil Equipped Units (Optional) - Trane GRAA Installation, Operation And Maintenance Manual

DX Coil Equipped Units (Optional)

See Coil Installation/Maintenance Manual for Refrigerant Piping, Liquid and Suction Line
Components, Refrigerant Charging and Thermal Expansion Valve Adjustment. Remove coil
cabinet access door located next to blower section. Cut holes in fixed door to allow suction and
liquid line passage. Provide weatherproof seal around suction and liquid lines at piping plate
when installed.
The DX Coil has a 300 ft/min. (1.524 m/s) minimum and a 600 ft/min. (3.048 m/s) maximum
velocity through the coil requirement. This is due to prevention of coil icing or 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
trap must be primed with either water (summer) or glycol (winter).
MUA-SVX003B-EN
Figure 11. Disconnect Box Locations
Figure 12, p. 28). Before unit operation begins, the P-
I I n n s s t t a a l l l l a a t t i i o o n n
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