WaterFurnace Envision Hydronic - Manual (Page 26)

26
NSKW INSTALLATION MANUAL
Unit Startup
Before Powering Unit
Check the following:
• High voltage wiring is correct and matches the
nameplate.
• Fuses, breakers and wire size are correct.
• Piping is completed and water system has been cleaned
and flushed.
• Air is purged from the closed loop system.
• Isolation valves are open and loop water control valves or
loop pumps are wired.
• Service/access panels are in place.
Primary Unit Startup
1. Apply power to the unit. Upon power up, the unit will
display the current operation mode.
• H for dedicated heating.
• C for dedicated cooling.
• U for reversible units.
2. Press the mode button. The LED screen will display the
current entering water temperature. The load pump will
activate after a 5 minute delay.
3. Once the load pump has been active for 3 minutes, the
controller will sample the temperature of the water
system. In heating mode, when the temperature of the
water shown on the display is lower than the set point
the compressor will activate.
4. By using a pressure gauge and the P/T ports, check the
pressure drop through both the load and source coaxes.
Compare this to the capacity tables in the specification
catalog to verify the proper flow rate through the unit.
5. Verify that the compressor, load side and source side
pumps are operating.
6. After determining the flow rates, use a thermometer and
the PT ports to determine the change in temperature on
both the load and source side coaxes.
7. Compute the formula l/s flow rate X change in
temperature x 4.2 (4.1 on source side if antifreeze/brine
is used in the loop) = Heat of Extraction on the source
side in heating, Heat of Rejection on the source side in
cooling. To ensure proper operation, compare these
values to the HE/HR tables.
8. Press the down arrow on the keypad to reduce the
set point below the incoming load temperature.
Compressor should shut off and the load pump should
shut off 30 seconds after the compressor.
9. Wait 7 minutes. The load pump should start to sample
load temperature.
10. Compressor and source side circulator should not start.
11. Press the up arrow on the keypad to increase the
set point to 5 degrees above the water temperature
displayed on the LED screen.
12. Three minutes after the load pump activates, the
compressor and source pump should activate.
Secondary Unit Startup
1. Apply power to the unit.
2. After a three to five-minute delay, the water temperature
shall be sampled. If the controller receives a remote
aquastat signal, the compressor shall activate.
3. Verify that the compressor and load side, source side
pumps are running.
4. By using a pressure gauge and the PT ports, check the
pressure drop through both the load and source coaxes,
and compare this to the Pressure Drop tables.
5. After determining the flow rates, use a thermometer and
the PT ports to determine the change in temperature on
both the load and source side coaxes.
6. Compute the formula l/s flow rate X change in
temperature x 4.2 (4.1 on source side if antifreeze/brine
is used in the loop) = Heat of Extraction on the source
side in heating, Heat of Rejection on the source side in
cooling. To ensure proper operation, compare these
values to the HE/HR tables.
7. Press the down arrow on the control to disrupt the
remote aquastat signal. Unit should shut off.
8. Instruct the owner or operator about the correct control
and system operation.