Draft Hood Installation; Piping At Boiler-Water Boilers; Steam Controls Assembly And Installation; Piping A Steam Boiler - Slant/Fin Galaxy GXH-300H Installation And Operating Instructions Manual

6
DRAFT HOOD—
The draft hood supplied is part of the listed boiler assembly.
DO NOT alter the hood. See dimensions, page 2.
Attach the hood to the boiler flue outlet. Connect flue pipe full
size of hood outlet. If a vent damper is added, it must be
installed on the outlet side of the hood. See Vent Piping, on
page 5, 8, 9. (Figures 4, 5, 8.)
PIPING AT BOILER — WATER PIPING
A. CIRCULATING SYSTEMS
1. Packaged water boilers are equipped with a water circu-
lating pump, mounted to return the water into the boiler.
For some installations, the pump should be on the supply
main. See PUMP LOCATION, on page 5.
B. AIR CONTROL SYSTEM
1. DIAPHRAGM-TYPE COMPRESSION TANKS are used to
control system pressure in an AIR ELIMINATING SYSTEM:
an automatic air vent is used to REMOVE air from the sys-
tem water. See illustration on page 5.
If system pressure needs further control, add an addition-
al tank or install a larger capacity tank.
Locate the tank near the boiler, as illustrated.
An automatic air vent should be installed in the top of the
boiler. See illustration on page 5.
2. PUMP LOCATION — Locating low-head pump(s) on
return to boiler is acceptable for smaller boiler sizes in
residences of one or two stories. The alternate pump
location shown in illustration on page 5 is required in
large, multi-story building installations, especially when
high-head pumps are used. The compression tank must
be at the boiler or between boiler and supply main
pump(s).
3.On a hot water boiler installed above radiation level,the
boiler must be provided with a low water cut-off device at
the time of installation by the installer.
Flow Control Valve: When domestic hot water tankless heater is used,
a flow control valve should be installed in supply piping to heating sys-
tem, as shown in illustration on page 5.
INSTALLATION INSTRUCTIONS FOR GXH LOW PRESSURE
STEAM BOILERS EQUIPPED WITH TANKLESS OR
PROVISION FOR TANKLESS AND McDONNELL & MILLER
TYPE 67 LOW WATER CUT-OFF.

STEAM CONTROLS ASSEMBLY AND INSTALLATION

INSTRUCTIONS
Steam kit components for Galaxy packaged models are
packed as follows:
A. 1. Low water cut-off control
2. Fittings
3. L.W.C.O. instruction sheet
B. 1. Pressure gauge
2. High pressure limit control
3. Water level gauge
4. Fittings
5. Instruction sheet and assembly drawing
6. Steam safety valve and 19 mm (
7. Drain cock
Assemble above components exactly as shown in steam controls
assembly. Two 13 mm ( / ") tappings are on right side of boiler for
1
2
this assembly. Two holes are pre-punched in jackets. For conve-
nience, start assembling in the following steps:
/ ") street coupling
3
4
C. 1. Install 13 mm × 140 mm (
L.W.C.O.
2. Mount 13 mm × 140 mm (
boiler tapping by rotating low water cut-off.
3. Assemble 90° brass tubing to tee adapter and L.W.C.O.
4. Install 13 mm × 152 mm (
× 16 mm ( / " × / ") adapter tee in upper boiler tapping.
1 5
2 8
5. Install syphon, high pressure limit and pressure gauge with
6 mm ( / ") brass fittings.
1
4
6. Install water level gauge (without glass) and its fittings.
7. Install water level glass, and mark the glass 648 mm (25
from the bottom of the steel boiler base for the water level.
(The steel boiler base should not be confused with a
combustible floor kit when making the 648 mm (25
measurement.)
8. Drain cock will be installed in return tee at the lower right
side of casting.
9. Safety valve and 19 mm (
installed in 19 mm ( / ") tapping on top of boiler.
3
4
PIPING A LOW PRESSURE STEAM BOILER
Boilers must be piped with good engineering practice and
must conform to the requirements of ANSI/ASME Boiler and
Pressure Vessel Code section IV and to the authority having juris-
diction.
Notes:
A. Slant/Fin makes no recommendation, nor does Slant/Fin
imply that One Pipe Parallel and Counterflow Gravity
Condensate Return systems shown on page 7 are the pre-
ferred systems. These systems are merely two examples of
many possible systems. Determination of the proper system is
based upon the application and is therefore beyond the scope
of this instruction.
B. The 457 mm (18") minimum height shown in figures 1-3, is the
minimum height between the top of the jacket of the boiler
and the 64 × 305 mm (2
ply piping from the boiler. It must NOT be confused with the
minimum height between the water level and the lowest return
bend of the steam supply main. This height is "H" as shown in
figures 2 and 3.
The minimum height of "H" must be at least equal to the sum
of the pressure drop of the system plus three times the friction
loss of the wet return, but not less than 457 mm (18") for a
system with a 0.9 kPa ( /
1
8
less than 28" for a system with a 3.5 kPa (
sure drop.
C. Modern steam boilers are smaller in water content than the
boilers that they replace, therefore a mechanical return system
(pump, receiver, etc.) must be employed if conditions exist
such that uniform condensate return flow to the boiler cannot
be maintained.
Pocketing of condensate and the inability to maintain the cor-
rect minimum height between the steam supply main and the
water level in the boiler are but a few of the many conditions
that indicate the use of a mechanical return system.
Any use of a receiver and pump must be coordinated with the
makeup water and controlled by the boiler water level control
on the boiler. This description is typical of a boiler feed pump
as opposed to a condensate pump that pumps condensate
regardless of the water level in the boiler.
D. In any steam system one of the requirements is the removal of
air from the system. A mechanical return system in most
/ " x 5 / ") brass nipple onto tee of
1 1
2 2
/ " x 5 / ") brass nipple into lower
1
1
2
2
/ " x 6") brass nipple and 13mm
1
2
/ ") street coupling should be
3
4
/ " x 12") header centerline in the sup-
1
2
" psi) steam pressure drop and not
/ psi) steam pres-
1
2
GALAXY
/ ")
1
2
/ ")
1
2