5.1
OVERVIEW
•
Combination boiler
(central heating and domestic hot water)
.
•
Designed for venting through a chimney.
•
TANK-IN-TANK indirect storage type domestic hot water production.
•
Fittings necessary for connecting the circulation kit for feeding the
heating circuit
(available as an option)
.
•
Control panel with on/off switch, adjustable thermostat, thermometer,
“Summer/Winter” selector and knockout for fitting ACV integrated
control system
(optional)
.
•
Flue gas anti-backdraught safety device.
•
Delivered complete with atmospheric type burner.
•
DELTA Classic models G20, G25 and G30, for natural gas, with
rated outputs of 23.2, 28.7 and 34 kW.
•
DELTA Classic model P30, for propane, with a rated output of
34.4 kW.
5.2
DESCRIPTION OF OPERATION
5.2.1
THE TANK-IN-TANK CONCEPT
The DELTA Performance series differs from traditional hot water
producers because of its ring-shaped tank immersed in the primary
fluid contained in the outer body. When there is a demand for hot water
from the central heating system or the domestic hot water system, the
thermostat starts the burner. The combustion gases quickly heat up the
primary fluid, creating a natural circulation around the tank.
5.2.2
DOMESTIC HOT WATER HEATED INDIRECTLY
This circulation facilitates heat exchange between the primary fluid and
the domestic water, which takes place all over the tank surface. The
corrugations on the inner and outer shells of the ring-shaped tank
further boost the area of heat exchange and speed up the heating
process of the domestic water.
5.2.3
EASY SETTING AND SAFETY ASSURED
With a single command, the water temperature of both the primary
circuit and the hot water circuit is set by the adjustable thermostat
situated on the tank in the primary circuit. A cut-off thermostat, placed
on top of the boiler, automatically cuts out the burner when the water
temperature in the primary circuit reaches 95° C. A manually reset
safety thermostat shuts off the burner if the temperature reaches
103° C.
5
DESCRIPTION
1. Primary fluid
2. Domestic hot water
3. Combustion chamber
4. Control thermostat
5. Burner
Fig. 13: Stainless steel domestic hot water tank
1
2
5
3
4
Fig. 14: Overview of boiler
8
