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Part number 550-142-054/0411
GV90+ gas-fired water boiler — Boiler Manual
70
Inspect recuperator
1. Follow the procedure on page 73 to inspect the recuperator and
clean if necessary.
Inspect temperature mixing system
1. Carefully check the temperature of the system return piping as
it passes through the boiler jacket and on the return pipe inside
the boiler jacket
just before it enters the boiler sections. You may
do this with a surface pyrometer or by lightly touching the piping
with your fingers.
To avoid potential of severe burn — Do not rest hands
on or grasp pipes
. Use a light touch only. Return piping
may heat up quickly.
2. The temperature of the water entering the system should quickly
heat up to about
140°F, being considerably hotter than the return
water from the system.
3. This is accomplished with the
two internal boiler circulators.
The Bypass circulator (page 2, item 7) takes hot water from the
boiler supply outlet and blends it with return water. The System
circulator (page 2, item 6) slows down to aid in raising the return
temperature entering the sections.
4. If the
temperature mixing system does not work correctly, check
the two circulators to be sure they are flowing water. If the circula-
tors are operating normally but the temperature mixing system
does not maintain water at the enterance to the boiler sections at
140°F, you may need to replace the boiler IBC or water temperature
sensor (page 2, items 1 and 8).
Inspect limit controls and cutoffs
1. Inspect and test the boiler limit control. Verify operation by turning
control set point below boiler temperature. Boiler should cycle off.
Return dial to original setting.
2. Inspect and test additional limit controls or low water cutoffs
installed on system. Follow the device manufacturer's instructions.
Inspect gauges
1. Boiler pressure/temperature gauge — Inspect gauge and check
whether readings are reasonable. Replace if any signs of leakage from
case or improper readings.
2. System gauges (if installed) — Inspect and check readings of other
gauges in system.
Annual start-up (continued)
Figure 79 Blower motor
Inspect blower motor
1. See Figure 79. With boiler power OFF, place a few drops
of Anderol 465 in each of the two oil cups.
Use only Anderol 465 to lubricate the blower
motor. Do not use universal household oils.
Motor could be damaged, resulting in possible
severe property damage.
Inspect oiled-bearing circulators
1. Both of the circulators installed in the boiler are water-
lubricated. No oiling is required.
2. Check other circulators in the system. Oil any circula-
tors requiring oil, following circulator manufacturer’s
instructions. Over-oiling will damage the circulator.