Product Warranty
18 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
INSTALLATION
Operation
The water heater is now ready for
normal operation. To keep your water
heater working safely and efficiently
and extend its life, perform mainte-
nance as described in maintenance
section beginning on page 29.
Start-up and Opera on
NOTE: The default opera ng mode is
Hybrid, to select a diff erent mode see
Opera ng Modes sec on on page 19.
PRIOR TO BEGINNING OPERATION:
Air fi lter is factory installed with tabs
oriented down for shipping. Please see
maintenance sec on for instruc ons on
removal, cleaning and replacing.
1
Turn on electrical power to the
water heater.
NOTICE: The water heater will conduct
a system diagnos c (approximately 8
minutes) each me power is applied
from an off state. Normal opera on will
begin a er the system diagnos c has
been completed..
2
Once the diagnos c sequence
has fi nished, the fan should
turn on. This typically takes 8
minutes, (the User Interface Module will
display “-”, “--”, “---” repe vely during
this period).
NOTICE: The heat pump’s fan will not
turn on if the incoming water tempera-
ture is less than 59°F/15°C and/or the
ambient air temperature is above
120°F/15°C, or below 45°F/7.2°C.
Should the internal diagnos cs detect a
problem with the heat pump, an error
code will be displayed.
3
Set the desired opera onal
mode. For typical installa ons,
the factory default mode,
Hybrid Mode off ers the best combina-
on of effi ciency and hot water delivery.
For detailed descrip ons of all opera-
onal modes see “Opera ng Mode
Descrip ons” page 19.
Step 12:
Adjus ng the
Temperature
With the installa on steps completed,
you may adjust the water heater’s tem-
perature se ng if desired.
1
The water heater’s tempera-
ture se ng has been factory
set to approximately 120°F to
reduce the risk of scald injury. You may
wish to set a higher temperature to
provide hot water for automa c
dishwashers or laundry machines, to
provide more hot water capacity, and to
reduce bacterial growth. Higher tank
temperatures (140° F) kill bacteria that
cause a condi on known as “smelly
water” and can reduce the levels of
bacteria that cause water-borne
diseases.
WARNING! Higher temperatures in-
crease the risk of scalding, but even at
120°F, hot water can scald (page 6).
If you increase the water heater’s tem-
perature se ng, install Thermosta c
Mixing Valve(s) at each point of use to
reduce the risk of scalding.
Figure 24 - Adjust Thermostat Mixing
Valves at each point of use to 120°F or
lower.
To adjust the water heater’s tempera-
ture se ng:
• The water temperature setting can
be adjusted by using the Up and
Down buttons
on the UIM
(User Interface Module). Using the
up or down buttons, cycle through
the available temperature set points
until the desired temperature is dis-
played. The temperature setting will
blink on the display; press the Mode/
Enter button to confirm the selection
(see figure 26, page 21).
• The available temperature set points
can be cycled through quickly by
pressing and holding the Up button.
2
Please allow adequate me for
the heater to provide hot
water.
WARNING! If you have increased the
temperature se ng and the Thermo-
sta c Mixing Valves are not set prop-
erly (or not installed) you could scald
yourself while checking the tempera-
ture.
3
Check water temperature at
several points of use in your
home (for example, bathtub
faucet, shower, or lavatory sink) and
adjust the Thermosta c Mixing Valves as
needed. If you aren’t sure how to adjust
the Thermosta c Mixing Valve se ngs,
or aren’t sure if you have Thermosta c
Mixing Valves, contact a qualifi ed
person.
INSTALLATION