990-4618A-001 InRow™ Chilled Water Air Conditioners Technical Specifications 57
I. COOLING COIL
1. ACRC100 Cooling coil shall use a raised lance type aluminum fin and 9.5-mm (3/8-in OD) copper
tube coils. Coil end supports shall be a minimum 18 gauge galvanized steel. Coil shall be rated for
a maximum pressure of 2757.9 kPa (400 psig).
2. ACRC/ACRP500 Series
a. Cooling coil shall use a raised lance type corrugated aluminum fin and 12.7-mm (1/2-in) OD
copper tube coils. Fin shall be a minimum of 0.0055 in thick. Tube wall shall be a minimum of
0.016 in thick. Coil tube sheets shall be a minimum 18 gauge G90 galvanized steel. The coil
shall be rated for a maximum pressure of 2757.9 kPa (400 psig). Coil headers are equipped
with drip plates in the bottom to route the condensate accumulating on the header tubes to the
condensation pan. The coil is configured in a counterflow arrangement to optimize heat
transfer efficiency.
3. Cooling Fluids
a. Chilled Water and solutions of propylene or ethylene glycol up to 50% may be used. Solutions
of brine or other aqueous salt are NOT permitted.
4. Freeze Protection
a. Per ASHRAE Handbook Fundamentals 2001 21.5, a maximum of 30% ethylene glycol and
35% propylene glycol are needed for freeze protection. Consult the ASHRAE handbook for
more details.
J. 2/3-WAY MODULATING VALVE
1. A floating point valve shall be microprocessor controlled to automatically direct the proper amount
of chilled water in the cooling coil to maintain desired conditions. A shut-off valve located in the
bypass line may be manually adjusted for 2-way flow if so desired.
2. Three way control valve shall be rated for 300 WOG with brass body and stainless steel ball.
3. Valve Actuator: Actuator shall be direct connect rotary floating point style actuator with
potentiometer feedback, and should be capable of being replaced without disconnecting piping
from the valve. Ability for manual operation is also provided.
K. CONDENSATE PAN
1. The unit shall consist of a primary and secondary drain pan (ACRC100 series). The secondary
drain pan shall be piped to the primary pan for removal of condensate. The primary drain pan shall
include a condensate pump and dual floats for control and overflow protection.
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