Dx Coil Equipped Units (Optional); Chilled Water Coil Equipped Units (Optional) - Trane GGAA 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

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 (51 mm) is required (See
the P-trap must be primed with either water (summer) or glycol (winter).

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:
20
Figure 8. Disconnect Box Locations
Figure 9, p. 21). Before unit operation begins,
MUA-SVX005B-EN