51
110332-04 - 2/23
PHTM II
Installation, Operating & Service Instructions
Figure 14-4: Home Screen at Power Up
(no call for heat)
Figure 14-5: Home Screen with CH and DHW
Demands
1. Start boiler using lighting instructions in Figure
14-9. With boiler powered up, and with no call for
heat, display should look like Figure 14-4. Once a
call for heat is present, it will look like Figure 14-5.
2. Boiler should attempt to fire several seconds after
a call for heat appears. With front door removed,
try for ignition will appear as an audible spark
(lasting approximately 4 seconds).
3. Upon initial start-up, gas train will be filled with
air. Even if gas line has been completely purged
of air, it may take several tries for ignition before a
flame is established.
4. If boiler does not light after 2 retries for ignition, it
will enter a "soft lockout" and will wait for one hour
before attempting another ignition sequence. This
soft lockout can be reset by interrupting power to
boiler.
5. Once a flame has been established for first time,
subsequent calls for burner operation should
result in a flame on first try.
9. Check inlet gas pressure (Figure 14-8).
Verify inlet gas pressure is between upper and
lower limits shown on rating label with all gas
appliances on and off. Be sure to close this
pressure tapping when gas pressure check is
complete.
14
Start-Up and Checkout
(continued)
6. If there is a problem, display will show error code
(Figure 14-6). Refer to label on access door and
Section 18 Troubleshooting to diagnose error.
Figure 14-6: Home Screen with Error
7. If successful ignition, display will show flame icon
(Figure 14-7)
Figure 14-7: Home Screen While Running
8. Boiler will automatically perform a calibration to
properly set its air-fuel ratio (i.e. O
2
or CO
2
and CO
levels).
Final Check Before Starting Boiler
(continued)
WARNING
Explosion Hazard.
Ensure inlet pressure tapping is fully closed
after checking pressure. Failure to comply
could result in severe personal injury, death, or
substantial property damage.
!
