WaterFurnace Envision2 - Manual (Page 16)

16
ENVISION 2 COMPACT INSTALLATION MANUAL
CAUTION: Never operate the HWG circulating
pump while dry. If the unit is placed in operation
before the hot water generator piping is
connected, be sure that the pump wires are
disconnected from the contactor.
Hot Water Generator Connections cont.
Hot Water Generator Startup
1. Make sure the power is off to the heat pump. Connect
the wire from the hot water generator pump to T1 on
the contactor.
2. Close the drain valve to the water heater.
3. Open the cold water supply to the tank.
4. Open a hot water faucet in the building to bleed air
from the system. Close when full.
5. Open the pressure relief valve to bleed any remaining
air from the tank, then close.
6. If so equipped, turn the venting (burping) screw in the
center of the pump two (2) turns open (water will drip out),
wait until all air is purged from the pump, then tighten the
plug. Use vent couplings to bleed air from the lines.
7. Carefully inspect all plumbing for water leaks and
correct as required.
8. Before restoring electrical supply to the water heater,
adjust the temperature setting on the tank.
• On tanks with both upper and lower elements,
the lower element should be turned down to
the lowest setting, approximately 100°F. The
upper element should be adjusted to 120°F to
130°F. Depending upon the specific needs of
the customer, you may want to adjust the upper
element differently.
• On tanks with a single element, lower the
thermostat setting to 120°F.
9. After the thermostat(s) is adjusted, replace the access
cover and restore electrical supply to the water heater.
10. Make sure that any valves in the hot water generator
circuit are open.
11. Turn on the unit to heating.
12. The HWG pump should be running. When the pump
is first started, turn the venting (burping) screw (if
equipped) in the center of the pump two (2) turns open
until water dribbles out, then replace. Allow the pump
to run for at least five minutes to ensure that water has
filled the circulator properly.
13. The temperature difference between the water entering
and leaving the hot water generator should be 5°F to
15°F. The water flow should be approximately 0.4 gpm
per ton of nominal cooling.
14. Allow the unit to heat water for 15 to 20 minutes to be
sure operation is normal.