Dx Coil Equipped Units - Trane GRAA Installation Operation & Maintenance

7 - Electrical Cabinet
Low Voltage Sect
High Voltag e Sec
I
L
Locate line voltage disconnect box per local codes. If
mounting the disconnect box to the unit, never mount
it to an unit access panel. Possible locations include
the front of the blower or filter section, the outdoor air
hood or the rear of the supply plenum (See Figure 8).
Electrical conduit must be routed so as not to inter-
fere with removal of any access panel.
NOTE : Should any orig i nal wire suppl ied with the
unit have to be replaced , it must be replaced wi th
wiri ng h av i ng a tempe rature ra ti ng of at least
105 ° C (221 ° F) .
DX COIL EQU I PPED UNITS (OPTIONAL)
See Coil Installation/Maintenance Manual for
Refrigerant Piping,
Liquid
and
Suction
Line
Components, Refrigerant Charging and Thermal
Expansion Valve Adjustment. Remove piping plate
located in lower corner next to filter section and cut
holes in plate to allow suction and liquid line pas-
sage. 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 preven-
tion of coil icing or condensate blow-off. To calculate
the velocity through the coil, apply the following for-
mula:
Velocity
Cooling Air Flow in CFM (m3/s)
through the coil ^ Coil Surface Area in ft2 (m2)
optio n al C o nt rol s
Jo u nci ng Locat io n
1Q Back Panel
OZ main connection Board
Q High Voltage Barrier Assy
O4 24V Transformer
Q5 High Voltage Terminal Block
O8 Ground Lug
O7 Din Mounting Rail
Contactor or Starter
1 D388 3
S - uisconnect tJox vocations
Di sconn ect
9
D iscon n ec t Box Located On Intake End Pane l (Return Air Only)
D (acanneet Box Located On Outs id e Air Hood
iii
S UPPLY AIR
Disconnect Box Located On Supply Ple num End Pan e l
D3-9-6-6
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
-10-