WaterFurnace Envision Hydronic (NDW) - Manual (Page 27)

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NDW INSTALLATION MANUAL
Verify the following:
• High voltage is correct and matches nameplate
• Fuses, breakers and wire size are correct
• Low voltage wiring is complete
• Piping is complete and the water system has been cleaned and flushed
• Air is purged from closed loop system
• Isolation valves are open and water control valves or loop pumps are wired
• Service/access panels are in place
• Transformer has been switched to lower voltage tap if needed (208/230 volt units only)
• Unit controls are in “off” position
• Flow switches are installed and ready
• Freeze detection setpoints have been set in the microprocessor
WARNING: Verify ALL water controls are open and allow water flow PRIOR to engaging the compressor. Failure
to do so can result in freezing the heat exchanger or water lines causing permanent damage to the unit.
Startup Steps
• Set thermostat control above cooling setpoint.
• Set thermostat control in cooling mode.
• Slowly reduce the control setting until both the compressor and water control valve/loop pumps are activated. Verify
that the compressor is on and that the water flow rate is correct by measuring pressure drop through the heat exchanger
and comparing to the Pressure Drop table. Check for correct rotation of scroll compressors. Switch any two power leads
at the L1, L2, and L3 line voltage termination block if incorrect.
• Perform a cooling capacity test by multiplying GPM x ΔT x 485 (antifreeze/water). Use 500 for 100% water. Check
capacity against catalog data at same conditions.
• Set control to “OFF” position.
• Leave unit “OFF” for approximately five (5) minutes to allow pressure to equalize.
• Adjust control below heating setpoint.
• Set control in “HEAT” position mode.
• Slowly increase the control setting until both compressor and water control valve/loop pumps are activated. The
reversing valve should be heard changing over.
• Perform a heating capacity test by multiplying GPM x ΔT x 485 (antifreeze/water). Use 500 for 100% water. Check
capacity against catalog data at same conditions.
• Check for vibrations, noise and water leaks.
• Set system to maintain desired setpoint.
• Instruct the owner/operator of correct control and system operation.
Unit Startup