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14
WATER PIPING
I. CIRCULATING SYSTEMS
A. Hot water heating systems include a water circulating
pump which may be mounted on the supply or return
side of the boiler based on system design. See figure 5.
II. AIR CONTROL SYSTEM
A. DIAPHRAGM EXPANSION 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 figure 9. If system pressure needs further
control, add an additional tank or install a larger capaci-
ty tank. Locate the tank near the boiler, as illus trated. An
automatic air vent should be installed in the top of the
boiler or air purger. See figure 9.
B. 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 is required in large, multi-
story building installations, especially when high-head
pumps are used. The expansion tank must be at the
boiler or between boiler and supply main pump(s).
Figure 9.
Piping arrangement
IMPORTANT: Hot water heating systems containing
high water volume, such as would occur with cast-iron
radiation, require special care with air elimination.
The circulating pump should be located on the boiler
supply pipe and the expansion tank and air scoop
should be located near the pump suction.
C. RADIANT FLOOR, LOW WATER TEMPERATURE AND
LARGE WATER VOLUME SYSTEMS. A boiler by-pass
loop, three way valve arrangement, primary secondary
pumping (with a boiler loop) or other acceptable method,
must be used to provide a minimum 130˚ return water
temperature to the boiler. This will prevent condensation
on the cast-iron sections that can result in poor combus-
tion and damage to the boiler.
D. On a hot water boiler installed above radiation level, the
boiler must be provided with a low water cutoff device at
the time of installation by the installer.
OPERATING INSTRUCTIONS
I. FILLING AND VENTING WATER SYSTEMS
A. Fill the system with water. Vent or purge off air.
B. Fire the boiler as soon as possible (see following warning and
instructions) and bring water temperature to at least 82°C
(180°F), while circulating water in the system.
C. Vent air and add water as needed to achieve operating pressure
on boiler gauge. Pressure must be between approximately 83
kPa (12 psi) (cold water) and 172 kPa (25 psi) (at water tempera-
ture setting of high limit control), for boilers equipped with 207
kPa (30 psi) relief valves. Boilers rated for a higher pressure and
3/4" Pressure Relief
Valve
equipped with a matching relief valve may operate at a higher
pressure, but no higher than 34 kPa (5 psi) below the relief valve
opening pressure.
D. Check for and repair any leaks before placing system in service.
Before firing boiler, make these checks:
1. System is full of water. Air is vented or purged.
2. Relief valve is installed in accordance with the ASME Boiler Pres-
sure Vessel Code, Section IV. Valve opening is not closed or
reduced in size.
3. Venting is installed according to instructions under "VENT PIP-
ING".
4. All wiring is completed, following applicable wiring diagrams.
5. Using soap solution, check for gas leaks in all gas piping from
meter to boiler pilot and manifold. Do not use open flame.
1. Intermittent Pilot System (IID).
FOR BOILERS EQUIPPED WITH HONEYWELL GAS
VALVE VR8204 or VR8304 (see figures 12 and 13).
SAFETY INFORMATION
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly,
a fire or explosion may result causing property damage, per-
sonal injury or loss of life.
A. This appliance is equipped with an ignition device which automati-
cally lights the pilot. Do not try to light the pilot by hand.
B. BEFORE OPERATING smell all around the appliance area for gas.
Be sure to smell next to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; Do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor's phone. Fol-
low the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never
use tools. If the knob will not push in or turn by hand, don't try to
repair it, call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part has been under-water. Immedi-
ately call a qualified service technician to inspect the appliance and
to replace any part of the control system and any gas control which
has been underwater.
Operating Instructions
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the pilot. DO NOT try to light the pilot
by hand.
5. Remove control access panel.
6. Turn gas control knob clockwise
then continue to "OFF". DO NOT force.
7. Wait five (5) minutes (longer for propane) to clear out any
gas, then smell for gas, including near the floor. If you then
smell gas, STOP! Follow "B" in the safety information
above on this page. If you don't smell gas, go to next step.
8. Turn gas control knob counterclockwise
9. Replace control access panel.
10. Turn on all electric power to the appliance.
11. Set thermostat to desired setting.
12. If the appliance will not operate, follow the instructions "To
Turn Off Gas To Appliance" and call your service techni-
Sentinel
until knob stops
to "ON".
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