17
1. Turn off hydronic unit circuit breaker at service entrance and/or disconnect switch.
MAINTENANCE
the pressure relief valve by pulling the lever at the
end of the valve until the lever is in line with the
centerline of the valve. (Figure 9) Quickly close
the valve to avoid losing an excessive amount of
water. Repeat this procedure several times on
a quick cycling basis to release any sediment
that could block the relief valve pressure sensing
mechanism. On heating system that use a manual
water make-up or feed mechanism, be sure not to
allow the system pressure to drop to 0 PSI when
cycling the relief valve. Allowing this condition to
occur could cause air to enter the system thus
requiring a purging as described in “Startup and
Seasonal Maintenance" on page 15.
! !
Because of its basic design, the hydronic block re-
quires only a minimum of periodic maintenance. The
preventive maintenance tasks described below are
not difcult and when done a yearly basis, will aid
the unit to continue its trouble free operation.
CAUTION
For safety reasons, the main power switch
to the block should be turned off at the main
service entrance before any work requiring
removal of the cover is done. All work should
be performed by qualied service personnel
familiar with the unit's control system
operation.
1. This boiler has been designed to provide years of
trouble free performance under normal operating
conditions. However, the owner should conduct a
general external examination at the beginning of
each heating season and at mid-heating seating
season to assure good working performance is
continued. In addition, a qualied service technician
should examine at least once every year.
2. Do not store anything against the boiler or allow dirt
or debris to accumulate in the area immediately
surrounding the boiler.
3. Elements will burn out if the boiler is not lled with
water when electrical power is turned on. Do not
connect thermostat wire until system has been
lled with water. Water should be drained out from
system only when absolutely necessary to make
repairs or prevent freeze-up during extended cold
weather shutdown.
4. The temperature and pressure gauge on the
system should be checked frequently. During
normal operating conditions, pressure should be
relatively stable throughout the heating season.
If pressure under normal operating conditions
consistently rises and falls over a period of time,
this can indicate a ll valve leak, system leak, or
compression tank malfunction. Leaks anywhere
in the system must be repaired without delay. If
any leaks or signicant pressure uctuations are
observed, call for service immediately.
5. Check pressure relief discharge piping to assure
that any discharged water will be properly routed
to a suitable container or drain. Manually operate
If the relief valve fails to completely close after cy-
cling, it will be necessary to remove it for cleaning or
replacement. Turn off power to boiler and isolate the
hydronic block by shutting off the inlet and outlet gate
valves. Reduce the water pressure to zero by opening
the relief valve. Remove the relief valve and inspect
the valve disc and seat. Cleaning these parts with a
clean lint free cloth may be all that is necessary. If
this procedure fails then replace the valve with a new
one of equal pressure and discharge rating. After
installing the cleaned or new relief valve, open the
gate valves and follow the procedure described in
“Startup and Seasonal Maintenance" on page 15.
FIGURE 9
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