HydroTherm UMHWX3-1 User's Information Manual
UMHWX3-1
22-UMHWX3
TO THE INSTALLER: THIS MANUAL IS THE PROPERTY OF THE OWNER AND MUST BE AFFIXED NEAR THE
BOILER FOR FUTURE REFERENCE.
TO THE OWNER: THIS BOILER SHOULD BE INSPECTED ANNUALLY BY A QUALIFIED SERVICE AGENCY.
HWX GAS BOILERS
USER’S INFORMATION MANUAL
W ARNING: If the information in this manual is not f ollo wed e xactly, a fire or explosion ma y
result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical 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.
Installation and service must be performed by a qualified installer, service agency or the
gas supplier .
BASIC OPERATION
A. General. This water boiler is a natural draft appli-
ance and is equipped with controls for proper operation. All controls must be in proper working order.
Contact a qualified service agency to provide annual
maintenance as specified in Installation, Operation
and Maintenance Manual.
1. Limit. See Figure 1. A de vice which automati-
cally interrupts boiler operation when the water
temperature exceeds the set point. Maximum
allowable temperature is 240°F (115°C).
Original equipment with this boiler is a
Honeywell L8148E1182. Boiler operation is
interrupted when system temperature reaches
cut-out temperature. Boiler operation resumes
automatically when system temperature falls
approximately 15°F (8°C) below the cut-out
temperature. See also Figures 4 and 5 for limit
sequence of operation.
2. Flame Rollout Switch.See Figure 1. A de vice
which automatically interrupts boiler operation
when flames or excessive heat are present in
the combustion area. The control is a single use
device. If the control is activated to interrupt
boiler operation, do not attempt to place boiler in
operation. Contact a qualified service agency.
3. Blocked Vent Switch (Vent Safety Shutoff
Switch). See Figure 1. A device which automatically interrupts boiler operation when there
is a blockage in the vent pipe or chimney. The
control is a manual reset device. The control is
located on the draft hood relief opening. If the
control was activated to interrupt boiler operation, do not attempt to place boiler in operation.
Contact a qualified service agency.
4. Pilot.The pilot provides the ignition source for
the main burners. Your boiler has a standing
(continuous) pilot or an intermittent pilot. The
intermittent pilot ignites only when there is a call
for heat and extinguishes when the call f or heat
ends. See Figures 6 and 7.
5. Gas Valve.The gas valve monitors pilot flame
and regulates gas flow to the burners and pilot.
See Figure 1.
6. Safety Relief Valve. A device which protects
the boiler against excessive pressure . The saf ety relief valve can discharge a large amount of
hot water - the installer should provide piping to
discharge water near floor at a floor drain. If the
safety relief valve discharges water, follow
instructions TO TURN OFF GAS TO APPLIANCE (see Figure 2 or 3), and contact a qualified service agency .
Figure 1: Control Locations
B. Instructions to place boiler in operation and to turn
off the boiler are shown on the Operating or Lighting
Instruction Label posted on the left side of the boiler.
The instructions are also shown in Figures 2 and 3.
C. The Sequence of Operation is shown in Figures 4
and 5.
WARNING
CAUTION
Service on this boiler should be undertaken only
by trained and skilled personnel from a qualified
service agency.
Should overheating occur or the gas supply fail
to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut off
the gas supply at a location external to the
appliance.
Do not use this boiler if any part has been under
water. Immediately call a qualified service
agency to inspect the boiler and to replace any
part of the control system and any gas control
which has been under water.
HWX USER’S INFORMATION MANUALPAGE 2
Figure 2: Intermittent Ignition Operating Instructions
HWX USER’S INFORMATION MANUAL PAGE 3
FOR YOUR SAFETY READ BEFORE LIGHTING
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.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on this
label.
2. Set the thermostat or operating control to lowest
setting.
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.
C. Use only your hand to slide the gas control switch.
Never use tools. If the switch will not slide 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. If the gas valve is not visible, remove control access
panel.
6. If the gas control switch is not in the "OFF" postion,
slide the switch to "OFF".
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.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat or operating control to lowest
setting.
2. Turn off all electric power to the appliance if service is
to be performed.
3. If the gas valve is not visible, remove the control
7. Wait five (5) minutes to clear out any gas. Then smell
for gas, including near the floor. If you smell gas,
STOP! Follow "B" in the safety information above on
this label. If you don't smell gas, go to the next step.
8. Slide the gas control switch to "ON".
9. Replace control access panel, if applicable.
10. Turn on all electrical power to the appliance.
11. Set thermostat or operating control to desired setting.
12. If the appliance will not operate, follow the
instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.
access panel.
4. Slide the gas control switch to "OFF".
5. Replace control access panel, if applicable.
SV9501/SV9601 9318 REV 3
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