7
Monitron S2 Boiler Operation and Installation Instructions
START-UP
NOTE: Make sure that all circuit breakers ahead of and at the
boiler are OFF.
Fill System
See Figures 3 through 5 for suggested purge valve and blocking valve.
If system is filled but not purged, radiators must be vented individually,
to prevent air blocking of water flow. Fill approximately 83 kPa (12 psi)
(cold water), whether automatic or manual fill is used. Do not apply full
line pressure to system; boiler and relief valve are rated at 207 or 345
kPa (30 or 50 psi) (see rating plate). Suddenly applied main pressure
can exceed 690 kPa (100 psi).
WATER CONTENT OF BOILER
All models EH-8 through EH-40 14.2 litres (3.75 U.S. Gallons)
Air Elimination
Diaphragm tank and air vent valve are recommended, see Figures 3
through 5. Air remaining in system will vent from the automatic vent
valve during system operation. Valve cap must be loose or removed to
allow automatic venting. Open relief valve briefly after filling to pressure,
to make sure boiler is free of air.
Bypass flow adjustment (Figure 4)
Close bypass valve. Turn down all zone thermostats. Inspect all zone
valves to be sure all are closed. Put a jumper on TT terminals. Close
ALL panels and turn on the 15 AMP control circuit breaker ONLY. Be
certain that the flow switch wires are not connected to the flow switch
terminals and the ends of the wires are taped. Connect the ohmmeter
or other continuity tester across the common terminal and the terminal
that is normally open during NO FLOW. Slowly open bypass valve until
continuity tester lights or ohmmeter kicks to zero: flow switch now has
closed contacts, indicating required minimum bypass flow rate when
piping circuits are shut off. Bypass valve should be locked at this posi-
tion. Shut OFF ALL circuit breakers ahead of and at boiler and open
CONTROL PANEL (left hand FRONT COVER). Remove jumper on
“TT” terminals. Connect zone valve end switches (in parallel) to thermo-
stat “TT” terminals. See figure 7 and wiring diagram on boiler. Connect
flow switch wire to flow switch common and N.O. terminals and to the
“FF” terminals in the boiler. Replace CONTROL PANEL COVER.
Check for Proper Boiler and System Operation
To check for proper boiler and system operation, perform the
following procedures:
1. Open boiler water supply valve. Boiler will not operate properly for
approximately 15 minutes, until all air is purged from water lines.
2. Turn up all room thermostats.
3. Turn “ON” Control (15 Amp, 120 Volt) single circuit breaker only.
Make sure that all Double (208/240 Volt) circuit breakers are “OFF”.
4. Water flow through the boiler should be sufficient to keep the flow
switch closed. The two limit switches should be closed.
5. There will be a delay of up to 5 minutes before all circuits are energized.
6. Check aquastat settings against aquastat control manual. The
aquastat is located under the left front control panel. CAUTION:
The aquastat control has line voltage in it. Care should be taken to
avoid touching any “LIVE” electricity carrying components.
7. Turn “OFF” Control (15 Amp, 120 Volt) single circuit breaker.
8. Replace all Control Panel Covers.
9. Turn “ON” all Double (208/240 Volt) circuit breakers.
10. Turn “ON” Control (15 Amp, 120 Volt) single circuit breaker.
11. The current may be checked by a qualified electrician at the feeder
panel and compared to the values shown in Table 2.
OPERATION
IMPORTANT:
DO NOT operate boiler until the following criteria have
been met:
1. Must be installed by qualified heating and electrical
contractors in accordance with instructions in this
manual.
2. Must be installed in compliance with local codes.
3. Must be inspected and approved by installing contrac-
tors and any local authority having jurisdiction, and be
approved for operation by them.
• Ask the installer to explain operation of the entire heating
system.
• Turn on all circuit breakers for boiler and circulator.
• Adjust wall thermostat to required temperature. If room
temperature is lower than the thermostat setting, the first
heater stage will go on immediately and the balance of the
heater stages will go on one at a time with a
delay of between several seconds and 1-1/2 minutes
between stages.
• In mild weather you may wish to reduce the total output of
heat. You may do this by turning off one or more of the
circuit breakers on the boiler. Do not turn off the 15 AMP
control circuit breaker.
PERIODIC INSPECTION
The hot water system, which includes the Monitron boiler, the
radiators and water control devices, should remain filled with
water at all times. DO NOT drain except to make repairs or to
prevent freeze-up during extended cold weather shutdown.
The pressure/temperature gauge on the Monitron should be
checked frequently: at the highest operating temperature,
pressure should be the same throughout the heating season.
If pressure (at a constant temperature) consistently rises or
falls over a period of time, a fill valve leak, a system leak or
compression tank malfunction is indicated. Leaks anywhere
in the system must be repaired without delay. Regular addi-
tion of fresh water to replenish leaks adds oxygen and lime.
Oxygen corrosion will cause further leaks and parts failure,
lime buildup on heating elements will cause element failure
due to overheating. If any leaks are found, or if pressure
changes, call for service immediately.
IMPORTANT
Under no circumstances should any electrical wiring or
internal controls be touched, except by an authorized
electrician (wiring and controls) or heating system ser-
vice expert (system service, repair, shutdown). Any
mechanical adjustments to the heating equipment and
system must be made by a qualified heating
serviceperson.