17
V: ELECTRICAL
DANGER
Positively assure all electrical connections are unpowered before attempting installation or service of
electrical components or connections of the boiler or building. Lock out all electrical boxes with padlock
once power is turned off.
WARNING
Failure to properly wire electrical connections to the boiler may result in serious physical harm.
Electrical power may be from more than one source. Make sure all power is off before attempting any
electrical work.
Each boiler must be protected with a properly sized fused disconnect.
Never jump out or make inoperative any safety or operating controls.
The wiring diagrams contained in this manual are for reference purposes only. Refer to the wiring diagram
of any controls used with the boiler. Read, understand and follow all wiring instructions supplied with
the controls.
A.
GENERAL
1. Install wiring and electrically ground boiler in
accordance with requirements of the authority
having jurisdiction, or in absence of such
requirements the National Electrical Code, ANSI/
NFPA 70, and/or the CSA C22.1 Electric Code.
2. A separate electrical circuit must be run from the
main electrical service with an over-current device/
disconnect in the circuit. A service switch is
recommended and may be required by some local
jurisdictions.
3. Wiring should conform to Figures 15 and 16.
B.
SYSTEM CONTROLS AND WIRING
1. Refer to National Electric Code or Local Electric
Codes for proper size and type of wire required.
Follow Code.
2. Use anti-short bushings on all wiring passing
through boiler jacket, junction boxes and/or control
boxes.
3. Use armored cable (BX) over all exposed line
voltage wiring.
4. If an indirect water heater is used, use priority
zoning.
DO NOT
use priority zoning for Hydro-Air
Systems.
5. Single/Multiple Zone System – Refer to Figure 15
for the electrical diagram for this type of system.
Connect the system circulator wire leads to the
proper terminal on the L7224 Aquastat control as
shown in Figure 15.
C.
INSTALL A ROOM THERMOSTAT
on an
inside wall about four feet above floor. Never install
thermostat on an outside wall or where it will be
influenced by drafts, hot or cold water pipes, lighting
fixtures, television, rays of the sun or near a fireplace.
Keep large furniture away from thermostat so there will
be free movement of room air around this control.
Connect the thermostat to the ‘T-T’ terminals on the
L7224 control.
Heat Anticipator in Thermostat should be set to .1 amps.
If system tends to overheat above the thermostat’s
temperature setting, reduce heat anticipator setting by
.1 or .2 amps. If system tends to short cycle without
reaching desired room temperature, increase heat
anticipator setting by .1 or .2 amps.
WARNING
The maximum allowable current for each circulator
is 5 amps at 120V AC. For circulators with higher
amp ratings, you must install a circulator relay or
starter coil to provide line voltage to the circulator
and connect only the relay or starter coil to boiler
terminals. The combined boiler and circulator
amperage must not exceed 15 amps.
Install over-current protection in accordance with
authority having jurisdiction or, in the absence of
such requirements, follow the National Electric
Code, NFPA 70, and/or CSA C22.1 Electrical Code.
DO NOT provide over-current protection greater
than 15 amperes.
