American Standard GRWF130A94A0A Installation Manual page 38

Control and Safety Switch Adjustment
Limit Switch Check Out
The limit switch is a safety device designed to shut
off the burner should the boiler become overheated.
Since proper operation of this switch is important
to the safety of the unit, it must be checked out on
initial start up by the installer.
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WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CAN/CGA B149
Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause an
unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which the
appliance(s) connected to the venting system are
located and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they are operating at maximum speed. Do not operate
a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. If improper venting is observed during any of the above
tests, the venting system must be corrected in
accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CAN/CGA B149
Installation Codes.
8. After it has been determined that each appliance
connected to the venting system properly vents where
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-fired
burning appliance to their previous conditions of use.
18-CG02D1-4
38
IMPORTANT: To check for proper operation of the
Water Temperature Limit switch (WTL), shut off the
power to the boiler and TEMPORARILY bypass the
supply water thermostat (SWT) with a TEMPORARY
JUMPER. TEMPORARILY remove power from the
boiler water circulator pump and restore power to the
boiler. Burners should come on and operate. Closely
monitor the water temperature. DO NOT allow the
boiler to overheat excessively during the checkout of
the WTL limit switch. When the boiler water tem-
perature reaches 230°F, the burners should turn off
automatically. Immediately shut off power to the
boiler if the burners did not shut off automatically
as the water temperature reached 230°F. The WTL
limit switch must be replaced and proper operation of
the new WTL verifi ed.
After the boiler cools, REMOVE THE JUMPER from
the SWT and RESTORE POWER to the boiler and
the boiler water circulator pump.
Boiler Operating Instruction Label
The boiler is shipped with a label on the front of the
unit. The label is seen in Figure 59. Read all instruc-
tions before operating the boiler.
Figure 59
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
: if you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
A. This appliance is equipped with an ignition
device which automatically 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. Follow the gas
supplier's instructions.
- If you cannot reach your gas supplier,
call the fire department.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information
above on this label.
2. Turn off all electric power to the
appliance.
3. Set the thermostat to lowest setting.
4. This appliance is equipped with an ignition
device which automatically lights the pilot.
Do not try to light the pilot by hand.
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power to the
appliance if service is to be performed.
2. Set the thermostat to lowest setting.
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. Immediately 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 under water.
5. Open the manual ON/OFF valve located
in the supply gas line.
6. Wait five (5) minutes to clear out any gas.
Then smell for gas including near the
floor. If you do smell gas, STOP!
Follow "B" in the safety information above
on this label. If you don't smell gas, go to
next step.
7. Set thermostat to desired setting.
8. Turn on all electric power to the appliance.
9. Turn the boiler ON/OFF switch to ON.
The boiler will begin to function
automatically.
If the appliance will not operate, follow
the instructions "To Turn Off Gas To
Appliance" and call your service
technician or gas supplier.
3. Turn the boiler ON/OFF switch to OFF
4. Close the manual ON/OFF valve located
in the supply line