Product Overview

35
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
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 26 thru 27.
B. 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.
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.
6 Electrical
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.
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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.
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