Install Instructions

39
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 11
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.
NOTICE
Do not block access to the electrical
cover plate when installing electrical
conduit.
TABLE 5A
AMP DRAW DATA
Model Controls Fan
Approximate
Total Amps @
120 VAC
497 4.6 3.4 8.0
647 4.6 3.4 8.0
747 4.6 3.4 8.0
987 4.6 3.4 8.0
1257 4.6 3.4 8.0
1437 4.6 3.8 8.4
1797 4.6 3.8 8.4
2067 4.6 3.8 8.4
MANUAL
RESET
HIGH LIMIT
24 VDC
COIL
RELAY
GROUND
SCREW
CONNECTION
BOARD
TERMINAL
STRIP
24 VAC
RELAY
ON/OFF
SWITCH
IGNITION
MODULE
TWO STAGE
THERMOSTAT
Figure 5-1_Control panel location
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.
⚠ WARNING
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
⚠ CAUTION
Installation & Service Manual