The water temperature control knobs are
located on the control console. The set
point is indicated by a temperature indica-
tor on the top of the back plate behind the
knob. When shipped from the factory the
knobs are rotated completely counter-
clockwise
to the lowest temperature
setting. The temperature settings can be
increased by rotating the knobs clockwise,
see Fig. 19 and 20 below.
•
Turn thermostat knob clockwise
to increase water temperature.
•
Turn thermostat knob counter-clock-
wise
to reduce water temperature.
The recommended temperature settings are
180ºF for the primary thermostat and 140ºF for
the secondary thermostat.
Studies have indicated that dangerous bac-
teria can form in the potable water distri-
bution system if certain minimum water
temperatures are not maintained. For pre-
vention of this, it is recommended the sec-
ondary thermostat be set at 140ºF.
•
By storing the water temperature at
140ºF or higher, the quantity of domes-
tic water delivered is higher and the
customer has additional protection
from any bacteria growth.
•
The secondary thermostat maintains the
minimum domestic water storage tem-
perature.
1. SETTING THE COMBINATION WATER
HEATER TEMPERATURE LIMITS
a. See Figs. 19 and 20 for recommended
setting.
2. SETTING DOMESTIC WATER TEMPER-
ATURE
HOT WATER REPRESENTS A SERI-
OUS SAFETY HAZARD DUE TO THE
POTENTIAL OF SCALDING
A thermostatic mixing valve is
REQUIRED in the domestic hot water
outlet that would allow the domestic water
to be supplied at a lower temperature than
the storage temperature.
The factory installed thermostatic mixing
valve can be adjusted to control domestic
supply water at 95ºF to 120ºF.
Refer to the mixing valve’s manufacturer’s
instructions for setting the desired domestic
supply temperature.
For proper operation of the thermostatic
mixing valve, the shut-off valve located
on the U-tube assembly MUST remain
open to avoid a potential scald hazard.
DANGER
DANGER
DANGER
23
SETTING THE WATER TEMPERATURE
Pha
se
III
-
Ph
as
e
III
- P
hase III
-
Ph
as
e
III
-
c
i
t
s
e
m
o
D
S
p
ac
e
h
ea
ti
ng
Temperature Up
Temperature Down
Temperature Indicator
Back
Plate
Knob
Fig. 19 : Secondary Thermostat Setting
Ph
as
e
III
-
Ph
ase III -
Ph
as
e
III
-
Pha
se
III
-
ci
ts
e
m
o
D
Space
heating
Temperature Up
Temperature Down
Temperature Indicator
Back
Plate
Knob
Fig. 20 : Primary Thermostat Setting
