Slant/Fin EH-M2 - Manual (Page 7)

EH-M2-40 Boiler Operation and Installation Instructions 7
B. Draw power feeder cable (75°C minimum) and conduit
through service K.O. provided on top and bottom.
C. Connect hot lines to distribution block provided in
service compartment. A ground lead should be drawn
and wired to the ground lug in the service compartment.
If rating plate indicates boiler is a single phase 3-wire or
3-phase 4-wire model, draw a neutral wire #12 AWG
maximum, 75°C. minimum and connect to neutral lug
mount provided in service compartment. See Tables 1
and 3 for lug sizes and current ratings.
3. Wiring Control
See EM-10 Electronic Control Set-Up Instructions
#790860000 for setting up control.
START-UP
NOTE: Make sure that all circuit breakers ahead of and at the
boiler are OFF.
Fill System
See Figures 2 through 4 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 approxi-
mately 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 30 or 50 psi (see rating plate). Suddenly
applied main pressure can exceed 100 psi.
Air Elimination
Diaphragm tank and air vent valve are recommended, see
Figures 2 through 4. 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 3)
Close bypass valve. Turn down all zone thermostats. Inspect all
zone valves to be sure all are closed. Put a jumper on thermostat
terminals 3 and 4. Close ALL panels and turn on the 10 AMP
control circuit breaker ONLY. Be certain that the flow switch wires
are not connected to the flow switch terminals
1 and 2 and the ends of the wires are taped. Be certain that a
jumperwire is between terminals 1 and 2. Connect the ohmmeter
or other continuity tester across the flow switch 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 valves should be locked at this position. Shut OFF ALL
circuit breakers ahead of and at boiler and open CONTROL
PANEL (left hand FRONT) COVER. Remove jumper on thermo-
stat terminals 3 and 4. Remove flow switch jumper wire from ter-
minals 1 and 2. Connect flow switch wire to flow switch terminals
1 and 2. Replace CONTROL PANEL COVER. Connect zone
valve end switches (in parallel) to thermostat terminal 3 & 4.
See Figure 5 and wiring diagram on boiler.
Check for Proper Boiler and System Operation
To check for proper boiler and system operation, perform the
following procedure:
1. Turn up all room thermostats.
2. On boiler models with a "Monitron" control system (model
number on rating plate contains an "M2"), there will be a
delay whose response time will depend on operating mode
and other settings.
3. Current may be checked by a qualified electrician at the feed-
er panel and compared to the values shown in Table 3.
4. Water flow through the boiler should be sufficient to keep the
flow switch closed. The limit thermostat should also remain
closed. Consult the Monitron II Electric Boiler Control Manual
for setting control.
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 and the balance of the heater
stages will go on one at a time with a delay between
stages.
IMPORTANT
You must turn on the circuit breaker marked "10" in order to
operate the boiler control system. You then may turn on the
other circuit breakers (those marked 25, 30, 50 or 60).
PERIODIC INSPECTION
The hot water system, which includes the Monitron II 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 shut-
down.
The pressure/temperature gauge on the Monitron II 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 serv-
ice expert (system service, repair, shutdown). Any
mechanical adjustments to the heating equipment and
system must be made by a qualified heating
serviceperson.