Raypak MVB 504A, Installation & Operating Manual

Page: 49 / 64

49
Fig. 48: 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. Confirm that the caps on the automatic air vent
valves were opened two full turns during the vent-
ing procedure.
3. Verify that air has been purged from the system.
4. Verify that air has been purged from the gas pip-
ing, and that the piping has been checked for
leaks.
5. Confirm that the proper start-up procedures were
followed.
6. Inspect burner to verify flame.
7. 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 con-
trols are tested. When safety devices are restored,
burners should re-ignite after pre-purge time
delay.
8. 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 nor-
mal operation.
9. 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 igni-
tion 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.
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.
GAS
TO BURNER
A
B
C
D