OMEGA | WATER SOURCE HEAT PUMPS
OMEGA-VSHPe.F-IOM-1912
9
www.omega-heatpump.com
7. UNIT START
-
UP
Ensure the building fluid loop system has been cleaned,
flushed, re
-
filled, chemically treated and commissioned
by the water treatment company. Verify that the main
system strainers or mechanical filtration system has
been installed and commissioned.
The chassis must
be at room temperature (68
o
F) prior to start up.
Do not attempt to start unit up when room tempera-
ture is below 60
o
F. Otherwise unit may experience
pressure faults. Repeated pressure trips may dam-
age the unit or cause property damage!
Once the installation of the cabinet and chassis units is
complete the riser shut
-
off valves can be opened. The
riser loop system should be filled and all trapped air
should be bled from the system prior to unit start
-
up.
Water flow failure will cause the unit to trip on the safety
devices. Repeated water flow failures can cause equip-
ment damage.
CHECKLIST
Before energizing the unit ensure all steps are verified in
the following checklist:
___High voltage power supply is correct and in accord-
ance with unit nameplate ratings.
___Unit is electrically grounded and circuit protection is
the correct size.
___Low voltage control wiring is correct as per unit wir-
ing diagram, including ERV bathroom timer.
___Riser loop system is clean, filled, and vented of any
air.
___Chassis unit high and low pressure caps are firmly
secure and in place.
___Chassis matches the cabinet model number.
___Protective cardboard air coil cover is removed and
unit service cover panel and filter are in place.
___There is a proper seal between chassis service cov-
er panel and unit cabinet.
___Riser shut
-
off valves are in the OPEN position.
___Riser loop system has been vented for any air intro-
duced during chassis installation.
___Riser loop water is circulating through all units and at
design conditions.
___Unit condensate drain hose is securely attached to
drain pan and condensate riser.
___All ductwork and ERV connections are complete.
___Clean filters are installed.
___All cutting, sanding, drywalling, patching work is
complete.
___Unit blower spins freely.
___Thermostat is in the OFF position.
___Room temperature is above 60
o
F.
INITIAL UNIT START
-
UP
1.
Close disconnect switch.
2.
Set thermostat to a high setting (above current room
temperature), set system to COOL with fan on AU-
TO. The compressor should not run.
3.
Lower the thermostat temperature setting until the
fan and compressor energize. Verify the following
results:
•
Leaving water temperature (LWT) in the heat ex-
changer water coil is warmer than the entering wa-
ter temperature (EWT) by approximately 9
o
F—
12
o
F.
•
Blower is running smoothly.
•
ERV fans are running on a low speed.
•
Compressor and blower amps are within nameplate
data.
•
Suction line is cool and no frosting is forming in the
refrigeration circuit.
4.
Set thermostat to the OFF position. Unit compressor
and fan should stop running.
5.
Allow the system to equalize for approximately 5
minutes.
6.
Set thermostat to the lowest setting and switch to
the HEAT position.
7.
Adjust thermostat temperature higher until the fan
and compressor energize. The following should
occur:
•
Warm air will flow from the supply register.
•
Leaving water temperature (LWT) in the heat ex-
changer water coil is cooler than the entering water
temperature (EWT) by approximately 5
o
F—
9
o
F.
•
Blower and compressor operation is smooth and no
frost development is visible in the refrigeration cir-
cuit.
8.
Set the thermostat to the desired temperature.
9.
Turn on bathroom exhaust fan. Verify unit ERV fans
are running on high speed.
10.
Turn off bathroom exhaust fan and verify unit ERV
fans are operating on low fan speed.
11.
Check for any water leaks at the hose connections.