Timer control switch, How your water heater works – Rheem Water Heater User Manual
Page 12
HOW YOUR WATER HEATER WORKS
12
TIMER CONTROL SWITCH
A timer control switch will help provide maximum savings with an electrically
operated boosted solar water heater connected to a continuous or an extended
Off-Peak electricity supply. If used with an extended Off-Peak supply, the timer
control switch should be a type which has an internal rechargeable battery to
keep time when the power supply is not available to the timer. Power must be
available to the timer control switch before the booster heating unit can be
activated.
The timer control switch should be set to suit the hot water consumption pattern
of the household. It is recommended only one or two periods per day, prior to
peak hot water consumption periods, be programmed into the timer. Suggested
periods, based on a 3.6 kW heating unit, are:
•
between 4:30 PM and 6:30 PM (270 model),
and if a second boost period is required
•
between 4:30 AM and 6:30 AM (270 model).
This will be sufficient for most installations. If the water heater has a 4.8 kW
booster heating unit, these periods could be reduced by 30 minutes with the
start time delayed, or a 2.4 kW booster heating unit, extended by 45 minutes
with the start time brought forward.
The booster heating unit will only activate if heating is required. When the water
is below the thermostat setting, the booster heating unit will turn on and heat
the water. The booster heating unit will automatically turn off either when the
temperature of the water reaches the thermostat setting or at the end of the
timer period, whichever comes first.
A manual on / off switch can also be installed between the timer control switch
and the water heater. This can be used to provide further control over the
boosting of the water temperature. Refer to
on
page 10.
Remember, even on cloudy days your solar water heater can receive
diffuse radiation, which will provide some heat to your stored water. On
these days you will need to operate the booster heating unit only as
desired. For summer operation it is recommended trial periods be
undertaken to determine if it is necessary to turn the booster switch or
one shot control ‘on’ at all.