State Standard Systems - Manual (Page 11)

11
ADJUSTABLE
THERMOSTAT
WITH
HIGH LIMIT
HIGH LIMIT
CONTROL
RESET
BUTTON
Figure 7.
Water
Temperature °F
Time for 1st Degree
Burn
(Less Severe Burns)
Time for Perma-
nent Burns 2nd &
3rd Degree (Most
Severe Burns)
110
116
116
122
131
140
149
154
(normal shower temp.)
(pain threshold)
35 minutes
1 minute
5 seconds
2 seconds
1 second
instantaneous
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 seconds
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
TABLE 2.
temperature adjustment
To adjust the temperature setting:
1. Turn “OFF” the electrical power to the water heater, at
the junction box.
haZard of electrical shocK! failure to turn
“off” electric power to the solar water heater will result
in the possibility of death, serious BodilY injurY
or propertY damaGe.
2. Take off the access panel and fold away the insulation.
3. Turn the water temperature dial clockwise ( ) to
increase the temperature, or counterclockwise ( ) to
decrease the temperature.
4. Fold the insulation back in place and replace the access
panel.
5. Turn “ON” the power supply.
RESET
BUTTON
Figure 8.
A non-adjustable high temperature limit control operates
before steam temperatures are reached. The high limit is
in the same area as the upper thermostat and must be reset
manually when it activates. BECAUSE THE HIGH LIMIT
ACTIVATES ONLY WHEN ABNORMALLY HIGH WATER
TEMPERATURES ARE PRESENT, IT IS IMPORTANT
THAT A QUALIFIED SERVICE AGENT BE CONTACTED
TO DETERMINE THE REASON FOR OPERATION
BEFORE RESETTING.
tanK sensor
The surface mount tank sensor should be attached to the
sensor stud behind the lower door by placing the hole in
the sensor over the stud provided and securing in place
with a nut. The end of the tank sensor shall be connected
to the red wires in the opening with wire nuts (with no
regard for polarity). The other ends of the red temperature
sensor extension extend from the top of the tank and shall
be connected to the controller in the tank sensor position.
draininG
It is recommended that the storage tank be drained and
flushed every 6 months to remove sediment which may
build up during operation. The water heater should be
drained if being shut down during freezing temperatures.
To drain the tank, perform the following steps:
1. Turn off power to the water heater.
2. Open a nearby hot water faucet until the water is no
longer hot.
3. Close the cold water inlet valve.
4. Connect a hose to the drain valve and terminate it to
an adequate drain or external to the building.
5. Open the water heater drain valve and allow all of the
water to drain from the tank. Flush the tank with water
as needed to remove sediment.
6. Close the drain valve, refill the tank, and restart the
heater as directed in this manual.
If the water heater is going to be shut down for an extend-
ed period, the drain valve should be left open.
IMPORTANT: Condensation may occur when refilling the
tank and should not be confused with a tank leak.
If the solar water heater is to be shut off and exposed to
freezing temperatures, it must be drained. Water, if left in
the tank and allowed to freeze, will expand and damage
the solar water heater.