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41InRow RP Technical Data Manual
ba. Air flow decreased while compressor off
bb. Suction pressure sensor failure
bc. Discharge pressure sensor failure
bd. High pressure switch active
be. Fan speed decreased to avoid high pressure (event only)
bf. Compressor speed decreased to avoid high pressure (event only)
bg. Compressor high pressure
bh. Oil return pump active
4. Logging: The microprocessor controller shall log and display all available events. Each alarm
log shall contain time/date stamp as well as operating conditions at the time of occurrence.
Controller shall display the run time hours for major components.
F. NETWORK MANAGEMENT CARD
The unit shall include a network management card to provide management through a
computer network through TCP/IP. Management through the network should include the
ability to change set points as well as view and clear alarms.
G. COOLING COIL AND CONDENSATE PAN
1. Chilled Water: Cooling coil shall use 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 1.2 mm (18 gauge) G90
galvanized steel. 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. Coil is configured in a counterflow arrangement to
optimize heat transfer efficiency.
2. Direct Expansion: Cooling coil shall use 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 end supports shall be a minimum 1.2 mm
(18 gauge) G90 galvanized steel. Coil shall be rated for a maximum pressure of 3447.3 kPa
(500 psig), and the coils are certified in accordance with UL207. Coil header is equipped with
a drip plate in the bottom to capture and direct the condensation accumulating on the suction
header tube to the drain pan. Coil has 6 circuits complete with brass distributor and copper
distribution tubes.
H. VARIABLE SPEED COMPRESSOR / VFD ASSEMBLY (AIR-COOLED ONLY)
1. Compressor: The unit shall be configured with a variable speed reciprocating hermetic
compressor using a matched VFD. As a result, the compressor speed can be varied through a
range between 30 and 85 Hz to accommodate varying load conditions. VFD firmware is
written to include oil return protection in cases where pipe velocities may drop to low speeds
during low loading periods.
2. Compressor is electrically protected through the VFD.
3. Compressor utilizes a noise cap for noise reduction.
4. Sight glass provided for air cooled system oil charging.
I. 3-WAY MODULATING VALVE (CHILLED WATER ONLY)
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.