Table of Contents
Advertisement
OPERATING INSTRUCTIONS
How to use the Temperature Controller
Figure 43
In Use
Indicator
Temperature
Display
Temperature
Selection
MC-91-2US
The MC-91-2 controller is the standard temperature controller that
is supplied with the water heater. On indoor models it is integrated
into the front panel.
The MCC-91-2 controller is for commercial and hydronic appli-
cations requiring higher temperatures. When the MCC-91-2 con-
troller is connected, these higher temperatures are available on all
controller models in the system. Refer to the section on tempera-
ture ranges.
DO NOT repeatedly operate the water heater and then use a hot
water tap while the controller is turned off. Operating the water
heater in such way to alternately produce hot water may cause
CAUTION
water to condense on the outside of internal parts and accumulate
in the water heater cabinet.
WARNING
• Before operating, smell all around the appliance area for gas.
DANGER
Be sure to smell next to the floor because some gas is heavier
than air and will settle on the floor.
• Keep the area around the appliance clear and free from com-
AVERTISSEMENT
bustible materials, gasoline, and other flammable vapors and
liquids.
ATTENTION
• Always check the water temperature before entering a shower
or bath.
• Do not use this appliance if any part has been under water.
Immediately call a licensed professional to inspect the appli-
ance and to replace any part of the control system and any gas
control which has been under water.
• Should overheating occur or the gas supply fail to shut off,
turn off the manual gas control valve to the appliance.
• Do not adjust the DIP switch unless specifically instructed to
do so.
• Do not use an extension cord or an adapter plug with this
appliance.
• Any alteration to the appliance or its controls can be danger-
ous and will void the warranty.
If you install this water heater in an area that is known to have
hard water or that causes scale build-up the water must be treated
and/or the heat exchanger flushed regularly. Damage and repair
Priority
due to corrosive compounds in the air is not covered by warranty.
Indicator
Keep the air intake location free of chemicals such as chlorine or
bleach that produce fumes. These fumes can damage compo-
Priority
nents and reduce the life of your appliance. Damage and repair
Button
due to scale in the heat exchanger is not covered by warranty.
How to Set the Temperature
ON/OFF
This water heater requires a minimum flow rate to operate. This
Button
rate can be found on the specification page in this manual. In some
cases when you are not getting hot water or if the water alternates
between hot and cold, it is due to the water flow being below or
close to the minimum flow rate. Increasing the flow rate should
resolve these problems in these cases.
If you are experiencing issues with higher temperature settings,
then reduce the temperature setting. Selecting a temperature clos-
er to that which is actually used at the faucet will increase the
amount of hot water being delivered to the faucet, due to less cold
water mixing at the fixture.
While any hot water is being provided, the temperature setting
can only be adjusted between 98
Check local codes for the maximum water temperature setting
allowed when used in nursing homes, schools, day care cen-
ters, and all other public applications.
If a newly installed unit with a controller has not been powered
for at least six (6) hours then the temperature will return to the
default setting of 104°F (40°C), if power is interrupted.
There may be a variation between the temperature displayed on
the temperature controller and the temperature at the tap due
to weather conditions or the length of pipe to the water heater.
Temperatures Available with a Controller
The water heater can deliver water at only one temperature setting
at a time. The available temperatures are provided Table 27.
42
CAUTION
WARNING
DANGER
AVERTISSEMENT
ATTENTION
1) If the water heater is off, press the Power but-
ton to turn on.
2) If the Priority light is off, then press the "Prior-
ity button" on the temperature controller. The
orange Priority light will glow indicating that
this controller is controlling the temperature
and that the water heater is ready to supply
hot water. (The priority can only be changed
while no hot water is running.)
3) Press the UP or DOWN buttons to obtain the
desired temperature setting.
All hot water sources are able to provide water
at this temperature setting until it is changed
again at this or another temperature controller.
N O T I C E
F (36.7
C) and 110
o
o
N O T I C E
F (43.3
C).
o
o
Advertisement
Table of Contents
