Sterling ME User Manual
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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 fi xed 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:
Velocity =
Cooling Air Flow in CFM (m
3
/s)
through the coil
Coil Surface Area in ft
2
(m
2
)
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" (51mm) is
required (See Figure 11). Before unit operation begins,
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 coil cabinet
access door, 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:
Velocity =
Cooling Air Flow in CFM (m
3
/s)
through the coil
Coil Surface Area in ft
2
(m
2
)
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 suffi cient differential to
overcome negative pressure of the indoor air blower. A
minimum height difference of 2" is required (See Figure
11). Before unit operation begins, prime P-trap with either
water (summer) or glycol (winter).
EVAPORATIVE COOLER
EQUIPPED UNITS (OPTIONAL)
Refer to Evaporative Cooler Installation and Service
Manual for water and electrical connections.
Figure 9 - Electrical Cabinet
Figure 10 - Disconnect Box Locations
Disconnect Box Located On Outside Air Application
Return Air Inlet
Return Air Inlet