23
FACTORY
WIRING
FIELD
WIRING
Figure 24. Wiring Electrical Connections
3.12.1. Field Connected Devices
It is strongly recommended that all individually-powered
control modules and the heater should be supplied from
the same power source.
Install heater controls, thermostats, or building
management systems in accordance with the applicable
manufacturers’ instructions.
A
A
NOTE: FI
eld-supplied isolation relays should be
installed when field-connected controllers are mounted
more than 50 equivalent feet (18 AWG) from heater. See
wiring diagrams.
NOTE:
Minimum 18 AWG, 105°C, stranded wire must
be used for all low voltage (less than 30 volts) external
connections to the heater. Solid conductors should not
be used because they can cause excessive tension on
contact points. Install conduit as appropriate. All high
voltage wires must be the same size (105°C, stranded
wire) as the ones on the unit or larger.
3.12.
Electrical Power Connections
A
A
WARNING:
Electrical power connection must be
performed by qualified licensed electrician(s) for the
voltage being applied.
Installations must follow these codes:
• National Electrical Code and any other national,
state, provincial or local codes or regulations having
jurisdiction.
• Safety wiring must be NEC Class 1.
• Heater must be electrically grounded as required by
the NEC.
• In Canada, CSA C22. 1 C.E.C. Part 1.
XTherm heaters are wired for 120VAC single-phase power.
These units come wired with separate connections for the
heater and pumps. These connections may be wired to
separate circuits, or joined to a single larger circuit.
Models 1005A and 1505A, except WH 1505A models
equipped with a heater pump for hard water, require
20A service for the heater and 15A service for the heater
pumps, or a single 40A-rated circuit.
WH 1505A heaters equipped for hard water require 15A
service for the heater and 25A service for the heater
pumps, or a single 50A-rated circuit.
Model 2005A heaters require 25A service for the heater
and 25A service for the heater pumps, or a single 50A
service.
Consult the wiring diagram shipped with the heater. Use
appropriately-sized wire as defined by NEC, CSA and/or
local codes. All primary wiring should be rated for 125% of
the minimum required service. Before starting the heater,
verify that the correct 120VAC voltage is being supplied to
the heater and pump.
If any of the original wire supplied with the heater must be
replaced, it must be replaced with 105°C or its equivalent.
Power is connected to the heater via the rear wiring box
as shown in
Figure 24
. Main heater power is connected
to terminals 1, 2 and 3 and pump power is connected to
terminals 4, 5 and 6.
Field wiring connections such as sensors, interlocks,
enable/disable and alarm contacts are made at the low-
voltage terminal strip at the front of the heater as shown
in
Figure 29
.
