MPO-IQ Installation, Operating, and Service Instructions
41
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. Refer to National Electric Code or Local Electric
Codes for proper size and type of wire required.
Follow Code.
3. A separate electrical circuit must be run from the
main electrical service with an over-current device/
disconnect in the circuit. A 15 amp circuit breaker is
recommended. A service switch is recommended and
may be required by some local jurisdictions.
4. Use anti-short bushings on all wiring passing through
boiler jacket, junction boxes and/or control boxes.
5. Use armored cable (BX) over all exposed line voltage
wiring.
6. Wiring should conform to Figures 28A thru 28C.
B. INSTALL A ROOM THERMOSTAT on an inside
wall about four feet above oor. Never install thermostat
on an outside wall or where it will be inuenced by drafts,
hot or cold water pipes, lighting xtures, television, rays
of the sun or near a replace. Keep large furniture away
from thermostat so there will be free movement of room
air around this control.
VII. ELECTRICAL
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.
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.