Engine Waste Heat Function - ITR Oasis® Zephyr ™ Oasis Zephyr HW Installation And Operating Manual

Domestic water sensing switch — If desired, you can install a manual
switch to turn the domestic hot water sensing circuit on and off. This
switch is connected to the W1 and W2 terminals on the accessory
terminal block. Refer to Section 6, Pg. 6-9, Figure 6-3 Wiring Diagram
8-2
Single Loop System, three fans, optional summer loop
Figure 8-1:
8.3

Engine Waste Heat Function

As outlined in section 7, the Oasis® Zephyr™ HW can be
used to preheat the engine and to use waste heat produced
by the engine.
While running, a liquid-cooled engine produces a large
amount of heat; some of this heat can be captured by the
Oasis® Zephyr™ and used to heat water and or provide
space heating. An aquastat attached to the heat exchanger,
wired to the A1 terminal, on the main board (see Section 6,
Pg. 6-9, Figure 6-3 Wiring Diagram) will start the internal
circulating pump if a thermostat or the domestic water
aquastat is calling for heat. Also, with the use of an
extremally mounted pump, the Oasis® Zephyr™ can pre-
heat the engine when engine coolant is directed through the
engine heat loop section of the heat exchanger.
NOTE: The engine heat function can be used with the control
board service switch ON or OFF.
Installation Manual for Oasis® Zephyr™ HW Heating System
Section 8, Domestic Hot Water Heating