Lochinvar EGS-I&S-01 - Manual (Page 9)

EGS-I&S-01
9
WARNING
SCALDING
This water heater can deliver scalding temperature
water at any faucet in the system. Be careful
whenever using hot water to avoid scalding injury.
By setting the aquastat on this water heater to obtain
an increased water temperature, you may create the
potential for scald injury. To protect against injury,
you should install an ASSE approved mixing valve
(a device to limit the temperature of water to protect
against scald injury via mixing hot and cold water
supply) in the water system. This valve will reduce
point of discharge temperature in branch supply
lines. Such valves are available from the
manufacturer of this water heater or a local plumbing
supplier. Please consult with a plumbing professional.
2. Aquastat satisfied.
a. Aquastat contacts open, turning off domestic hot
water circulator and de-energizing relay.
b. Normally open contacts open, stopping boiler
operation.
c. Domestic hot water priority only: Normally
closed contacts close, returning boiler control
to space heating.
WATER TEMPERATURE ADJUSTMENT
1. The aquastat controls the maximum water temperature
in the tank. The differential is a fixed 5°F with a 160°F
maximum setting, set at the factory to 120°F.
Table 4 details the approximate relationship of water
temperature and time with regard to scald injury and may
be used as a guide in determining the safest water
temperature for your applications.
2. For the most energy efficient operation, adjust the
aquastat for the minimum water temperature necessary
to meet domestic hot water needs. Refer to Figure 6.
Use a small flat screwdriver to rotate the temperature
dial through the hole directly below the temperature
indication window. The temperature setting is aligned
with the notch in this window. IT IS NOT
NECESSARY TO REMOVE THE COVER TO
ADJUST THE TEMPERATURE SETTING. THE
AQUASTAT COVER SHOULD NEVER BE
REMOVED WITHOUT ELECTRICITY BEING
FIRST DISCONNECTED.
APPROXIMATE
TIME/TEMPERATURE
RELATIONSHIPS IN SCALDS
120°F More than 5 minutes
125°F 1 ½ to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1 ½ seconds
155°F About 1 second
Table 4 – Scald Relationships
Figure 5 - Scald Warning Figure 6 - Aquastat Control