ELECTRICAL CONNECTIONS
A separate branch circuit with copper conductors, overcurrent protective
device and suitable disconnecting means must be provided by a qualified
electrician.
All wiring must conform to local codes or latest edition of National Electrical
Code ANSI/NFPA 70.
The water heater is completely wired to the junction box at the top of the
water heater. An opening for 1/2” electrical fitting is provided for field wiring
connections.
The voltage requirements and wattage load for the water heater are
specified on the rating label on the front of the water heater.
The branch circuit wiring should include either:
1. Metallic conduit or metallic sheathed cable approved for use as a
grounding conductor and installed with fittings approved for the
purpose.
2. Nonmetallic sheathed cable, metallic conduit or metallic sheathed
cable not approved for use as a ground conductor shall include
a separate conductor for grounding. It should be attached to the
ground terminals of the water heater and the electrical distribution
box.
To connect power to the water heater:
1. Turn the power off.
2. Remove the screw/screws holding the junction box top cover.
3. Install L1 to L1, L2 to L2 and ground to the green ground wire
connected to the bottom of the junction box.
NOTE: Install electric connections according to local codes or latest
edition of National Electrical Code ANSI/NFPA 70.
WARNING:
Proper ground connection is essential.
The presence of water in the piping and water heater does not
provide sufficient conduction for a ground. Nonmetallic piping,
dielectric unions, flexible connectors, etc., can cause the water
heater to be electrically isolated. Do not disconnect factory
ground.
The manufacturer’s warranty does not cover any damage or defect caused
by installation, attachment or use of any type of energy-saving or other
unapproved devices (other than those authorized by the manufacturer)
into, onto or in conjunction with the water heater. The use of unauthorized
energy-saving devices may shorten the life of the water heater and may
endanger life and property.
The manufacturer disclaims any responsibility for such loss or injury resulting
from the use of such unauthorized devices.
If local codes require external application of insulation blanket kits, the
manufacturer’s instructions included with the kit must be carefully followed.
240V
Junction box
cover
Junction box
Factory Ground
House Ground
(Green)
L2 (Red)
L1 (Black)
8
Installation
BRANCH CIRCUIT SIZING GUIDE
Total Water
Recommended Over-Current Protection
Heater Wattage
(fuse or circuit breaker amperage rating)
208V 240V 277V 480V
3,000
20 20 15 15
4,000
25 25 20 15
4,500
30 25 25 15
5,000
30 30 25 15
5,500
35 30 25 15
6,000
40 35 30 20
8,000
50 45 40 25
9,000
– 50 45 25
10,000
–
–
50
30
11,000
–
–
50
30
12,000
–
–
–
35
Total Water
Copper Wire Size AWG Based
Heater Wattage
on N.E.C. Table 310-16 (167°F/75°C.)
208V 240V 277V 480V
3,000
12 12 14 14
4,000
10 10 12 14
4,500
10 10 10 14
5,000
10 10 10 14
5,500
8 10 10 14
6,000
8
8
10
12
8,000
8
8
8
10
9,000
–
8
8
10
10,000
–
–
8
10
11,000
–
–
8
10
12,000
–
–
–
8
NORMAL STARTUP CONDITIONS:
Once tank is full and power is energized, you may experience the following:
NOTE: Heat Pump operating range is 35°F - 120°F (2°C-49°C).
Elapsed
Time
HEWH Actions
Comments
0 to 2 min-
utes
Unit will go through
self-check and display
countdown
This 2-minute off-time pre-
vents compressor damage.
2 to 22
minutes
Compressor and fan
turn on
This 20-minute period is used
to ensure the tank is full of
water (Dry-fire prevention
algorithm).
22
minutes
and beyond
Compressor and fan turn
off, heating elements
turn on. After initial
heat-up, elements turn
off and compressor
turns on.
The water heater is operat-
ing in Hybrid mode. Quickly
provides initial amount of hot
water, then switches to effi-
cient heat pump for majority
of heating.
Application of any external insulation, blankets or water pipe insulation
to this water heater will require careful attention to the following:
• Do not cover the temperature and pressure-relief valve.
• Do not cover access panels to the heating elements.
• Do not cover the electrical junction box of the
water heater.
• Do not cover the operating or warning labels attached to the water heater
or attempt to relocate them on the exterior of the insulation blanket.
• Do not block the air inlet/outlets in the top covers or rear of the unit.
NOTE: This guide recommends minimum branch circuit sizing based on
the National Electric Code. Refer to wiring diagrams in this manual for
field wiring connections.