49
11. Check to see that the high limit control is set
above the design temperature requirements of the
system. For multiple zones: Check to make sure
the flow is adjusted as required in each zone.
12. Check that the heater is cycled with the thermo-
stat. Raise the setting on the thermostat to the
highest setting and verify that the heater goes
through the normal start-up cycle. Reduce to the
lowest setting and verify that the heater goes off.
13. Observe several operating cycles for proper oper-
ation.
14. Set the heater thermostat to desired temperature.
15. Review all instructions shipped with this heater
with owner or maintenance person, return to enve-
lope and give to owner or place the instructions
inside front panel on heater.
OPERATION
Lighting Instructions
1. Before lighting, make sure you have read all of the
safety information in this manual.
2. Remove upper front panel.
3. Set the thermostat to the lowest setting.
4. Turn off all electrical power to the appliance.
5. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
6. Turn on main manual gas valve field installed near
gas inlet connection on back of heater.
7. Wait 5 minutes to clear out any gas. Then smell for
gas, especially near the floor. If you then smell
gas, STOP! Follow the steps in the safety informa-
tion on the front cover of this manual. If you do not
smell gas, go to next step.
8. Turn on all electrical power to the appliance.
9. Set thermostat to desired setting. The appliance
will operate. The igniter will glow after the pre-
purge time delay (15 seconds). After igniter
reaches temperature (30 seconds) the main valve
should open. System will try for ignition up to three
times (one time on optional single-try ignition mod-
ule). If flame is not sensed, lockout will
commence.
10. If the appliance will not operate, follow the instruc-
tions “To Turn Off Gas To Appliance,” and call your
service technician or gas supplier.
11. Replace upper front panel.
12. If heater fails to start, check the diagnostic board
for troubleshooting information and verify the fol-
lowing:
a. There are no loose connections or that the
service switch is off.
b. High temperature limit switch is set above wa-
ter temperature or manual reset high limit is
not tripped.
c. Thermostat is set above water temperature.
d. Gas is on at the meter and the heater.
e. Incoming dynamic gas pressure to the gas
valve is NOT less than 4.0 in. WC for natural
gas or propane gas.
To Turn Off Gas To Appliance
1. Shut off manual gas valve field installed near gas
inlet connection on back of heater.
2. Remove upper front panel.
3. Set the thermostat to lowest setting.
4. Turn off all electrical power to the appliance if serv-
ice is to be performed.
5. Replace access panel.
Summary of Contents for Xtherm 1005
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Page 43: ...43 Model 2005 ...
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