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A
GAS
B
C
Figure 44. Leak Test Procedure
Post Start-Up Check
Check off steps as completed:
1. Verify that the heater and heat distribution units or
storage tank are filled with water.
2. Verify that air has been purged from the system.
3. Verify that air has been purged from the gas piping,
and that the piping has been checked for leaks.
4. Confirm that the proper start-up procedures were
followed.
5. Inspect burner to verify flame.
6. Test safety controls: If heater is equipped with a
low water cut-off or additional safety controls, test
for operation as outlined by manufacturer. Burner
should be operating and should go off when controls
are tested. When safety devices are restored,
burners should re-ignite after pre-purge time delay.
A
1ST SEAT
FIRING
B
VALVE
2ND SEAT
C
MANUAL
VALVE
TO BURNER
TO BURNER
F10687
7. To test the fixed manual-reset high limit built into the
PIM, first set dip switch #8 on the PIM to the ON
position. This will activate a Commission Test Mode
which will turn on the amber Alarm/Test LED on
the PIM. The fixed high limit setting is temporarily
overridden to match the setpoint potentiometer
position on the PIM. The high limit can now be
adjusted by the potentiometer to assist in commission
testing and verification of high limit functionality. The
®
VERSA IC
will allow one-time operation of the
limit and then must be returned to normal operation
by turning dip switch #8 back to the OFF position.
Power to the unit must then be cycled off, then on to
return to normal operation.
8. Test ignition system safety device:
a. Close manual gas valve. Turn power on.
b. Close Enable/Disable circuit to call for heat.
c. The burner should attempt three trials for ignition
for the standard model and then lock out. Single
try ignition modules will try only once and then
lock out.
d. Open manual gas valve. Reset the ignition
control by pressing for one second and then
releasing the reset button on either the user
interface or at the PIM to clear the ignition fault.
9. To restart system, follow lighting instructions in the
Operation section.
10. 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.
11. Check that the heater is cycled with the thermostat.
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.
12. Observe several operating cycles for proper
operation.
13. Set the heater thermostat to desired temperature.
14. Review all instructions shipped with this heater with
owner or maintenance person, return to envelope
and give to owner or place the instructions inside
front panel on heater.
45
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