WaterFurnace Series NXW - Manual (Page 35)

35
ENVISION 2 NKW 50Hz REVERSIBLE CHILLER INSTALLATION MANUAL
NKW Factory Startup
Job Site Recording Process
1.
Complete the top of the NKW Start-Up Form for each unit.
*Be sure to note the mode (Heat/Cool) you will be testing the unit in as well as freeze protection details of
type and concentration (Test to Verify). If starting-up in both heating and cooling modes, a start-up form for
each mode will need to be completed.
*The unit must be tested in both heating and cooling modes.
2. Take the unit offline (disconnect the aqua stat or BAS system) to obtain full control of the compressors from the
MUI (Controls contractor must disable all external controls).
a. Place load/source pumps in “Hand” position so they can be manually controlled. (Mechanical contractor
must enable pumps).
b. Check the incoming power supply voltage and record it.
c. On 380-420V units verify that the transformer is set correctly prior to testing.
3. Energize line power to the unit and record Thermistor Checks prior to energizing the compressors or water flow.
4. Start Pumps and verify flow through the heat exchangers by recording the pressure drop in the Evaporator/
Condenser
Flow Analysis section.
5. Locate the maintenance menu in the MUI and enable Y1, compressor 1. If lead/lag is enabled, compressor 1 might
not always be the first compressor to start.
6. Allow the unit to run for a minimum of 10 minutes so that the refrigeration circuit can balance itself out before
recording any of the data. Ideally the unit should be operating at anticipated operating conditions. In other
words if the unit is spec’d to run with a entering water temperature of 90° on the load side, we would like to see
the start-up data recorded with the unit operating at these conditions, however this may not be possible.
7. Once the unit reaches desired load conditions, record the amp draw on the compressor that is running.
8. Record the entering and leaving water temps on the load and source side and record the load and source freeze
temps for the circuit that is running.
9. Disable Y1 and enable the Y2 call and repeat steps 6, 7, and 8 for compressor 2.