HWM-407CH-IOM (09/13)
Page 22
6. Start-Up
The following conditions must be met before starting the HWM:
•
The toggle switch on the HWM cabinet must be “OFF”.
•
The system has been charged according to instructions.
•
Heating elements in the hot water storage tank are “OFF”.
•
Temperature of water in hot water storage tank is less than 100°F.
•
HWM pump is primed and tank water pressure is normal.
•
Gage manifold set is connected to high and low pressure connections on the
compressor unit.
•
The storage water heater temperature controller is adjusted to the highest desired
water temperature setting (110°F maximum).
•
An accurate temperature sensor is connected to the “Water Out” tube of the HWM
and insulated from ambient air temperature
.
The HWM start-up steps are as follows:
1. Turn the HWM toggle switch to “ON”.
2. Start system running and monitor compressor discharge pressure and HWM “Water Out”
temperature as water temperature rises.
3. If compressor discharge pressure reaches 350 psig before desired hot water temperature
is achieved, adjust the storage tank temperature controller setting to turn the compressor
off, or (next):
4. When “Water Out” temperature is achieved (pressure < 350 psig), adjust water storage
tank temperature controller to turn compressor unit “OFF”. Reference Figure 11.
5. The water storage tank temperature controller setting should be verified by draining some
hot water from the tank and cycling the system again.
