Electrical Connections - Rheem 72V20-1 Use And Care Manual

Ground screw
Junction
Conduit
box cover
connector
Wire connections
Water heater junction box.
CAUTION: The presence of
water in the piping and water
heater does not provide
sufficient conduction for a
ground. Non-metallic piping,
dielectric unions, flexible
connectors etc. can cause the
water heater to be electrically
isolated.
NOTICE: This guide recommends minimum branch circuit sizing and wire size based on National Electric Code. Refer to
wiring diagrams in this manual for field wiring connections.

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 inside jacket at the top
front of the water heater. An opening for
1/2" or 3/4" electrical fitting is provided
for field wiring connections.
The voltage requirements and wattage load
for the water heater are specified on the
rating plate on the front of the water heater.
Branch Circuit Sizing and Wire Size Guide
Total Water Recommended Over Current Protection
Heater Wattage (fuse or circuit breaker amperage rating)
120V
1500* 20
1700 20
2000 25
2500 30
3000 35
3500 –
3800 –
4000 –
4500 –
5000 –
5500 –
6000 –
9000 –
*Less than 1500 watts may be wired 14 gauge with 15 amp protection. Check Local Electrical Codes, as they will also apply.
The branch circuit wiring should include
either:
Metallic conduit or metallic sheathed
cable approved for use as a grounding
conductor and installed with fittings
approved for the purpose.
Non-metallic 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.
Copper Wire Size AWG Based
on N.E.C. Table 310-16 (75°C)
208V 240V 120V
15 15
15 15
15 15
15 15
20 20
25 20
25 20
25 25
30 25
30 30
35 30
40 35
– 50
208V 240V
12 14 14
12 14 14
10 14 14
10 14 14
8 12 12
– 10 12
– 10 12
– 10 10
– 10 10
– 10 10
– 8 10
– 8 8
– – 8
9