Attention Installer
Required clearances:
There must be a 7” (17.8 cm) clearance between any object
and the rear and sides of the water heater in the event service
is needed. A minimum 8“ (20.3cm) clearance above the
water heater to remove the lter for cleaning and for service
access, and clear access to the front of the water heater, is
recommended. Installations that require 6” clearance on the
sides or rear of the water heater for earthquake straps are
also acceptable. In these cases, additional clearance must be
provided on the opposite side of the unit to allow for service
access. The hot and cold water plumbing and electrical
connections must not interfere with the removal of the lter.
If a separate ducting kit is purchased, additional space
is required above and to the rear of the water heater for
installation. Consult the ducting kit manual for specic
instructions.
Model appearance may vary.
TYPICAL INSTALLATION
To Electrical Junction
Box (use only copper
conductors)
Hot water
outlet to
fixtures
(suggested)
Union
Thermal
expansion tank
To cold
water supply
Shut-o valve
3/4” FNPT tting to
Condensate Drain Pan
Temperature &
Pressure Relief Valve
Condensate Drain
Tube
Relief Valve discharge
6” (15.2 cm) minimum
from the oor
Room size:
Because this unit draws in air from the room to heat the water,
the room must be at least 10’ x 10’ x 7’ (700ft³) [3.05m x 3.05m
x 2.13m (19.82m³)] or larger. If the room is smaller there must
be a louvered door or a ducting kit installed.
Protect Unit:
During installation cover and protect upper part of the unit
from potential installation debris.
Installation Checklist:
1. Tank location:
– Does room size require louvered door, ducting, or
similar ventilation? 10’ x 10’ x 7’ (700 cu. ft.) or 240
square inches (0.15 m2) open air-flow area needed.
– Back of unit away from wall by 7 inches (17.5 cm),
and sides have at least 7 inches (17.5 cm) clearance.
(6 inches clearance for earthquake strap installations).
– Front of unit is free and clear.
– Is the water heater level? If no, add shims under the
base of the unit to ensure proper function of sensors.
2. Verify Air Filter is installed. (Located in packaging).
3. Plumbing connections:
– Does not prevent air filter removal.
– No leaks after filling the tank with water, either when
water is flowing or not.
4. Condensate lines are in place:
– Main flexible or rigid drain line installed and directed
to a drain or condensate pump. Reducer fittings are not
recommended.
5. Temperature and pressure-relief valve is working and
drain line completed per local code.
6. Electrical: Verify 208/240 VAC to L1 and L2 at tank.
7. Electrical connection does not prevent air filter removal.
8. Verify control panel displays 120°F (49°C) Hybrid mode.
Assist user in how to adjust temperature and modes
(see “About the Water Temperature Setting” section on
page 7 of the Owner’s Manual).
Normal Startup Conditions:
Once the tank is full and power is energized, you may
experience the following:
Elapsed
Time
0 to 2
minutes
2 to 22
minutes
22
minutes
and
beyond
NOTE: Heat Pump operating range is 35°F - 120°F (2°C-49°C).
HEWH Actions Comments
Unit will go through
self-check and display
countdown.
Compressor and fan
turn on.
Compressor and fan turn
off, heating elements turn
on. After initial heat-up,
elements turn off and
compressor turns on.
This 2-minute off-time prevents
compressor damage.
This 20-minute period is used to
e the tank is full of water
ensur
(Dry-fire prevention algorithm).
The water heater is operat-
ing in Hybrid mode, quickly
providing an initial amount of
hot water before switching to
the efficient heat pump for the
majority of heating.
238-52325-00 02/18
Printed in USA