OMEGA-VSHP.F-PGD-1904 | OMEGA
www.omega-heatpump.com
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bonded to aluminum fins. Coil shall be sized to meet scheduled
performance for cooling and heating. Provide 1” T/A filter on coil
face.
4.6
Water side condenser heat exchanger shall be coaxial
type with steel outer tube and copper inner tube. Condenser shall
be rated at 500 psig water side and 650 psig refrigerant side.
4.7
The chassis shall employ an optional motorized auto shut
-off valve to shut off water to the unit. Valve shall be mounted in the
chassis compartment.
4.8
The chassis shall employ optional autoflow balancing
valve mounted in the chassis compartment for regulating the water
flow to nominal rated flow over 2-80 psig differential water pressure.
5 CONTROLS
5.1
Each unit shall be factory wired with all necessary con-
trols. Each unit shall come standard with a microprocessor control-
ler mounted in the electrical box. Electrical box shall contain com-
pressor and fan motor contactor, 24 volt control power transformer,
terminal block for low voltage field wiring connection, and terminal
block for main power electrical connection, (optional) unit mounted
service disconnect switch.
5.2
The operating and safety controls shall be monitored by
the microprocessor controller. Sensor parameters and timers shall
be field adjustable to meet site conditions. Controller shall have the
following safety switches and sensors:
Low Pressure Safety Switch
High Pressure Safety Switch
Entering Water Temperature sensor
Leaving Water Temperature sensor
Suction line freeze-stat temperature sensor
Supply Air Temperature sensor
Compressor Anti-Short Cycle timer
Water Valve open and Closed timer
Low-pressure bypass timer
Random wait time on unit power up
Fan-On and Fan-Off timer
5.3
Microprocessor controller shall have Web based test and
diagnostic mode capability for quick servicing and troubleshooting
on site.
5.4
Thermostats shall be remote mounted. Unit will come
with a standard 24 inch thermostat whip factory wired to the con-
troller board terminals. Thermostats shall be either:
(A) Manual changeover low voltage for cooling and heating opera-
tion. Sub base shall have system “Heat
-Off-
Cool” and fan “On
-
Auto”
switches.
(B) Automatic changeover low voltage for cooling and heating opera-
tion. Sub base shall have system “Off
-
Auto” and fan “On
-
Auto”
switches.
(C) Programmable microelectronic for cooling and heating, night
setback, night setup, and day/night time clock operation. Thermo-
stat shall have system “On
-
Off”, temperature “Heat
-Auto-
Cool” and
fan “On
-
Auto” switches.
5.5
Microprocessor board shall have a field selectable setting
for 3-speed thermostats or for single speed thermostats. Units with
ECM option shall have a low fan speed “whisper mode” for silent air
circulation.
5.6
Electrical box shall have a factory mounted 3-speed se-
lector switch.
5.7
For ECM fan option, speed settings are field configurable
using the imbedded Web based interface to meet site static require-
ments.
6 TESTING & WARRANTY
Each chassis unit shall be factory tested using a multi-step comput-
er controlled testing unit to prevent operator error during factory
testing.
Warranty shall be for parts, 1 year not to exceed 18 months from
date of shipment. (Optional) Provide 5 year compressor replacement
parts warranty only.
7 EXECUTION
7.1
Units shall be installed on neoprene vibration isolation
pads and secured to floor. Units shall be installed level and accord-
ing to manufacturer instructions.
7.2
Installing contractor shall install risers and install riser
transition piece connections where riser sizes change. The hoses
shall be installed in the field by the contractor. The flare fittings on
the hoses shall be connected according to industry standard (Finger
tighten then tighten with wrench while always using back-up
wrench).
7.3
(Add for Gold Units) Discharge plenum shall be fastened
to the underside of the concrete slab for noise attenuation using
appropriate industry accepted mounting practices.
7.4
The riser system shall be flushed, cleaned and commis-
sioned before connecting chassis units to the riser system.
7.5
Start-up of units shall be supervised by trained represent-
atives of the equipment manufacturer.
SPECIFICATIONS (CONT’D)
