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Part Number 550-101-009/0107
47
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
O Check/test
Gas piping
1. Sniff near floor and around boiler area for any in-
dication of a GASLEAK.
2.
4ESTGASPIPINGUSINGBUBBLETEST per Section
of this manual, if there is any indication of a leak.
Cold fill and operating pressures
1. While the system is cold, note the PRESSUREREADING
ONTHEBOILERPRESSURETEMPERATUREGAUGE6ERIFYTHAT
cold fill pressure is correct.
2.
7ATCHTHEPRESSURE as the boiler and system heat
up to ensure pressure rise is normal. Too high a rise
would indicate a waterlogged or undersized expan-
sion tank.
Air vents and air elimination
1. Inspect automatic air vents (if used). Also inspect
air separators to ensure they are operational.
2. The cap must be unscrewed one turn to allow air to
escape.
3. See
&IGURE. If the air vent is leaking, remove cap
!and briefly push valve "and then release to clean
the valve seat.
4. Replace cap
!by twisting all the way onto valve "
and then unscrewing one turn.
&IGURE Automatic air vent, typical
Limit controls and cutoffs
)NSPECTANDTESTTHEBOILERLIMITCONTROL6ERIFYOP-
eration by turning control set point below boiler
TEMPERATURE"OILERSHOULDCYCLEOFF2ETURNDIALTO
original setting.
2. Inspect and test additional limit controls or low
water cutoffs installed on system.
Service & maintenance – annual start-up (cont.)10b
Expansion tank
1. Expansion tanks provide space for water to move in
an out as the heating system water expands due to
temperature increase or contracts as the water cools.
Tanks may be open, closed or diaphragm or bladder
type. See Section of this manual for suggested best
location of expansion tanks and air eliminators.
/PENTYPE — located above highest radiator or
BASEBOARDUNITUSUALLYINTHEATTICORCLOSET(ASA
gauge glass and overflow pipe to a drain.
#LOSEDTYPE — welded gas tight and located above
boiler. Tank is partially filled with water, leaving an
air cushion for expansion.
s -AKESURETHISTYPEOFTANKISlTTEDWITHA
TANK
lTTING
SUCHASTHE"'Tank-Trol or Taco
Taco-Trol. This fitting reduces gravity circula-
tion of air-saturated tank water back to the
system and prevents the air from bubbling up
through the water as it returns from the sys-
tem.
s
$ONOTUSEAUTOMATICAIRVENTSINSYSTEMS
WITHCLOSEDTYPETANKS
The air will escape
from the system instead of returning to the tank.
Eventually, the tank will waterlog and no longer
control pressurization. The boiler relief valve
will weep frequently.
$IAPHRAGMORBLADDERTYPE — welded gas tight
with a rubber membrane to separate the tank pres-
surizing air and the water. May be located at any
point in the system, but most often found near the
boiler.
s 3YSTEMSWITHTHISTYPEOFEXPANSIONTANKREQUIRE
at least one
AUTOMATICAIRVENT, preferably lo-
cated on top of an air eliminator, as shown in
examples in manual Section
.
2. If relief valve has tended to weep frequently, the ex-
pansion tank may be waterlogged or undersized.
#LOSEDTYPE TANK — tank is most likely water-
logged. Install a tank fitting if not already installed.
Then check fill level per fitting manufacturer’s
instructions. If fill level is correct, check tank size
against manufacturer’s instructions. Replace with
a larger tank if necessary.
$IAPHRAGMORBLADDERTYPE — first, check tank
size to be sure it is large enough for the system. If
size is too small, add additional tank(s) as neces-
sary to provide sufficient expansion. If tank size is
large enough, remove tank from system and check
charge pressure (usually 12 psig for residential ap-
plications). If tank won’t hold pressure, membrane
has been damaged. Replace tank.