Water Heater Operating Control Module; Connecting To Electrical Supply; Installation Must Comply With - A.O. Smith 400 - 2100 Installation & Operation Manual

5
Electrical connections

Connecting to electrical supply

This unit is wired for 120 VAC service. The unit, when
installed, must be electrically grounded in accordance with
the requirements of the authority having jurisdiction or in
the absence of such requirements, with the latest edition
of the National Electrical Code ANSI/NFPA No. 70. When
the unit is installed in Canada, it must conform to the
CAE C22.1, Canadian Electrical Code, Part 1 and/or local
Electrical Codes.
1. Use only Type-T wire [63°F (35°C) rise] on all wiring
between the unit and field-installed devices.
2. Enclose line voltage wire exterior to the unit in approved
conduit or approved metal-clad cable.
3. The pump must run continuously when the unit is
being fired (water heaters must use the pump delay if
the pump is to be cycled. See Freeze Protection, page 44
when cycling the pump). Water heaters use the
pump delay as standard in accordance with ASHRAE
90.1 requirements.
4. To avoid serious damage, do not energize the unit until the
system is filled with water.
5. Provide the unit with proper overload protection.
Do not block access to the electrical
NOTICE
cover plate when installing electrical
conduit.
Figure 5-1_Control panel location
TRANSFORMER
150 VA
CONNECTION
BOARD
GROUND
SCREW
TERMINAL
STRIP
38
WARNING
CAUTION

Installation must comply with:

1. National Electrical Code and any other national, state,
provincial, local codes, or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1,
and any local codes.
Model Controls Blower
400
500
650
750
1000
1250
1450
1800
2100
*Standard Pump Supplied with Water Heaters
IGNITION
MODULE
ON/OFF
24 VAC
SWITCH
RELAY
Installation & Operation Manual
ELECTRICAL SHOCK HAZARD – For your
safety, turn off electrical power supply before
making any electrical connections to avoid
possible electric shock hazard. Failure to do
so can cause severe personal injury or death.
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
TABLE - 5A
AMP DRAW DATA
Pump
FLA*
3.6 2.7 5.8
3.6 2.7 5.8
5.4 3.4 5.8
5.4 3.4 5.8
7.3 3.2 7.4
7.3 3.2 7.4
7.3 6.7 7.4
7.3 6.7 7.4
7.3 6.7 7.4
CIRCUIT
BREAKER
MANUAL
RESET
HIGH LIMIT
IMG00593
24 VAC
RELAY
Approximate Total
Amps @ 120 VAC
12.1
12.1
14.6
14.6
17.9
17.9
21.4
21.4
21.4