Specifications

990-4618C-001 InRow Chilled Water Air Conditioners Technical Specifications 91
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
4. 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.
5. 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. ACRC301S/ACRC301H
a. A proportional 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.
b. Three-way control valve shall be rated for 360 psig with a brass body and nickel/chromium-
plated brass ball.
c. Valve Actuator: Actuator shall be a direct connect rotary proportional actuator with analog
signal feedback, and should be capable of being replaced without disconnecting piping from
the valve. Ability for manual operation is also provided (ACRC301S only). A spring return
mechanism is attached to the actuator for the ACRC301H unit.
2. ACRC500/ACRP500
a. 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.
b. Three-way control valve shall be rated for 300 WOG with brass body and stainless steel ball.
c. 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 (excluding ACRC301H)
1. The unit shall consist of a primary and secondary drain pan. 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.
L. CONDENSATE PUMP
1. ACRC301S
a. The factory-installed condensate pump is piped internally to the condensate pan. It is capable
of pumping 5 L/h (1.3 GPH) liquid a maximum distance of 15.2 m (50 ft), which may include