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4. Adjust the air shutter on the right fan until
the differential pressure is 1.35" w.c. Note:
the left and center fans must be running
as you set the right fan. Also, the ∆P of
t h e l e f t a n d c e n t e r f a n s w i l l i n c r e a s e
above 1.35" w.c. with the right fan on. This
is normal.
5. Once the adjustment procedure is complete,
r e c o n n e c t t h e t u b i n g t o t h e p r e s s u r e
switches and check all tubing and wire
connections for snug f it. Reconnect wire
or jumper to the X and B terminals on the
terminal strip. Test f ire the unit. Install
upper panel and access door.
GAS TRAIN AND CONTROLS
Gas Train Drawing
300,000 Btu Model
FIG. 46
Gas Train Drawing
990,000 - 2,070,000 Btu Models
FIG. 47
NOTE:
The gas train and controls
assembly provided on this unit have been tested
under the applicable American National
Standard to meet minimum safety and
performance criteria such as safe lighting,
combustion and safety shutdown operation.
PIPING OF THE BOILER SYSTEM
The drawings in this section show typical boiler
p i p i n g i n s t a l l a t i o n s . B e f o r e b eg i n n i n g t h e
i n s t a l l a t i o n , c o n s u l t l o c a l c o d e s f o r s p e c i f i c
plumbing requirements. The installation should
provide unions and valves at the inlet and outlet of
the boiler so it can be isolated for service. An air
s e p a r a t i o n d ev i c e m u s t b e s u p p l i e d i n t h e
installation piping to eliminate trapped air in the
system. Locate a system air vent at the highest point
in the system. The system must also have a properly
sized expansion tank installed. Typically, an air
charged diaphragm-type compression tank is used.
The expansion tank must be installed close to the
boiler and on the suction side of the system pump
to insure proper operation. Caution: this boiler
system should not be operated at less than 12
PSIG. Hot water piping must be supported by
suitable hangers or floor stands, NOT by the boiler.
Copper pipe systems will be subject to considerable
expansion and contraction. Rigid pipe hangers could
allow the pipe to slide in the hanger resulting in
noise transmitted into the system. Padding is
recommended on rigid hangers installed with a
copper system. The boiler pressure relief valve must
be piped to suitable floor drain. See the relief valve
section in the Installation and Service Manual.
CAUTION !!
A leak in boiler "system" will cause the "system"
to intake fresh water constantly, which will cause
the tubes to accumulate a lime/scale build up.
This will cause a NON-WARRANTABLE
FAILURE.
WATER CONNECTIONS
HEATING BOILERS ONLY
The 300,000 Btu/hr boiler has 2" NPT inlet and
outlet connections. The 990,000-2,070,000 Btu/hr
input boilers have 2
connections. Caution: f ield installed reducing
bushings may decrease flow resulting in boiler noise
or flashing to steam.
CIRCULATOR PUMP
REQUIRMENTS
This is a low mass, high eff iciency hot water boiler
which must have adequate flow for quiet, eff icient
operation. Pump selection is critical to achieve
44
" NPT inlet and outlet
1/2
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