Raypak MVB 5042004 - Manual (Page 46)

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for operation as outlined by manufacturer. Burner
should be operating and should go off when con-
trols are tested. When safety devices are restored,
burners should re-ignite after pre-purge time
delay.
8. Test limit control: While burner is operating, move
indicator on high limit control below actual water
temperature. Burner should go off while blower
and circulator continue to operate. Raise setting
on limit control above water temperature and
burner should re-ignite after pre-purge time delay.
NOTE: Ignition control may have to be reset
after this portion of the test.
9. Test ignition system safety device:
a. Open manual gas valve. Turn power on.
b. Set thermostat to call for heat.
c. When the heater is in operation, pull hose off
the air switch. The burner should go off almost
immediately.
d. Reattach hoses. Burner should re-ignite after
pre-purge time delay. NOTE: Ignition control
may have to be reset after this portion of
the test.
10. To restart system, follow lighting instructions in the
Operation section.
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 operation, 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, verify the following:
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.