TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
2.6 FANS – VARIABLE SPEED SUPPLY - AND EXHAUST
A. Provide forward curved supply and exhaust fans with fixed-pitch sheave drive assemblies.
Dynamically balance all fans and the unit's running fan assembly (fan mounted on actual
shaft, bearings and in scroll housing) to assure smooth operation of the fan and it's
associated assembly. Balancing of the fan only shall not be acceptable.
B. Provide forward curved supply and airfoil return fans with fixed-pitch sheave drive
assemblies. Dynamically balance all fans and the unit's running fan assembly (fan
mounted on actual shaft, bearings and in scroll housing) to assure smooth operation of the
fan and it's associated assembly. Balancing of the fan only shall not be acceptable.
C. Mount fan motor(s) and fan on a common base assembly and isolated from unit with 2”
spring isolators. Provide thrust restraint isolation on the fan housing/fan board to assure
smooth fan startup transition and operation.
D. Fan shaft shall be mounted on grease lubricated ball bearings.
E. Motor shall be premium efficiency. Motor shall have a standard T-frame and a minimum
service factor of 1.15. All drive components shall be accessible without the use of
scaffolds or ladders, to facilitate periodic maintenance checks and for operator safety.
2.7 EVAPORATOR COIL SECTION
A. Provide heavy duty aluminum fins mechanically bonded to copper tubes. Evaporator coil
shall be inter- circuited to maintain active coil face area at part load conditions. Coil shall
also utilize internally enhanced tubing for maximum efficiency.
B. Provide a thermostatic expansion valve (TXV) for each refrigerant circuit. Factory pressure
and leak test coil.
C. Provide pitched stainless steel drain pan to assure positive drainage of condensate from
the unit casing.
2.8 AIR-COOLED CONDENSER SECTION
A. Condenser coils shall have all Aluminum Microchannel coils. All coils shall be leak tested
at the factory to ensure pressure integrity. The condenser coil is pressure tested to 650
psig. Subcooling circuit(s) shall be provided as standard.
B. Provide a baked phenolic resin corrosion-protective coating on the condenser coils and
fins.
C. Provide subcooling circuit(s) integral with condenser coils to maximize efficiency and
prevent premature flashing of liquid refrigerant, to a gaseous state, ahead of the
expansion valve.
PACKAGED ROOFTOP AIR CONDITIONING UNITS 15733-6