Safety Check For Control System; Protection From Freezing; Water Treatment - Slant/Fin Galaxy GXH-300H Installation And Operating Instructions Manual

GALAXY
d. Clean and replace burners* and pilot. Adjust burners as
described on page 13.
* To clean burners run a clean flue brush up the tube
until all foreign matter is removed.

SAFETY CHECK FOR CONTROL SYSTEM

A. High limit control test: Set thermostat high enough for boiler
water temperature to reach high limit control setting. When
this temperature is reached, the high limit switch should
open, and the main gas valve should close automatically. If
the high limit does not close the main gas valve, the valve,
the high limit or the wiring is faulty. Repair or replace
immediately.
B. Gas valve safety shutdown test:
1. For boiler equipped with constant burning pilot, with main
burners firing, disconnect the thermocouple or thermopile
generator from the gas valve. The gas valve should
Immediately shut off the main burners and the pilot.
2. For boilers equipped with Honeywell S8600 intermittent
pilot system, with main burners firing, disconnect the igni-
tion cable from the S8600 IGNITOR BOX. The gas valve
should shut off the main burners.
3. For boilers equipped with White Rodgers intermittent pilot
system, with main burners firing, disconnect the lead from
No. 2 terminal on the No. 3049 pilot sensor switch. The
gas valve should shut off the main burners.
If the gas valve fails to shut down main burners when the
test in 1,2 or 3 is performed, replace the gas valve.
C. Check for gas leaks from valve and gas piping to burners and
pilot. If leaks are found, repair or replace as required.
PROVIDING PROTECTION FROM FREEZING.
Anti-freeze is sometimes used in hydronic heating systems to
protect against freeze-up in the event of
power failure or control shutdown when the building is unoccu-
pied. It should be recognized that unless the building is kept
above freezing temperature by some means, the plumbing
system is not protected.
Two types of anti-freeze may be used: ETHYLENE GLYCOL,
used in automobiles, has desirable properties, but is toxic. Its
use may be prohibited when system water/glycol solution is in
contact with a potable water vessel (as with a tankless heater).
PROPYLENE GLYCOL is used in the quick-freeze food indus-
try; it is practically non-toxic. Its use may be permitted when
tankless heaters are used. When anti-freeze must be used,
inhibited propylene glycol is recommended. Useful information
on the characteristics, mixing proportions, etc. of glycol in
heating systems is given in Technical Topics No. 2A, available
from the Hydronics Institute 34 Russo Place, Berkeley Heights,
NJ 07922. Consult glycol manufacturers for sources of
propylene glycol.

WATER TREATMENT:

A good water treatment program will not only extend the
useful life of this boiler but it will also save much of the time
and expense of repairs made necessary by preventable
occurrences.
A reputable water treatment company should be consulted to
evaluate and determine the best overall treatment program for
your boiler equipment.
KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE, AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
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