50
PHTM II
Combi Installation, Operating & Service Instructions
110331-03 - 1/22
15. Check inlet gas pressure (Figure 15-8).
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.
15
Start-Up and Checkout
(continued)
16. Perform combustion test.
WARNING
Asphyxiation Hazard.
Use a combustion analyzer to verify proper
operation by checking carbon monoxide (CO)
levels. Failure to use a combustion analyzer
could cause operation of boiler with elevated
CO levels resulting in severe personal injury,
death or substantial property damage.
A. Boiler is equipped with a screw cap in
vent adapter. Be sure to replace this cap
when combustion testing is complete.
B. Measure carbon monoxide (CO) level after
5 minutes of operation above 50% firing rate.
This can be done by providing DHW demand.
Ensure door is sealed before taking
combustion readings.
C. CO should not exceed 200 ppm air free.
(in event of high CO, see Section 19
Troubleshooting).
17. Perform a check of ignition safety shut-off device.
With burner firing, carefully unplug black ignitor/
flame sensor wire at burner door using a pair of
insulated pliers (Figure 15-1). Burner should shut
off immediately.
18. Test any external limits or other controls in
accordance with manufacturer's instructions.
19. Refer to Section 16 Operation to set-up control for
system in which boiler is installed. Some common
set-up tasks include:
A. Setting CH and DHW temperature set-points.
B. Defining system pump operation.
C. Turn DHW comfort mode "On" (if using DHW
recirculation).
20. Review User's Information Manual and system
operation with homeowner.
!
Figure 15-8: Gas valve inlet pressure tap
Inlet
Pressure
Tapping
12. If there is a problem, display will show error code
(Figure 15-6). Refer to label on access door and
Section 19 troubleshooting to diagnose error.
Figure 15-6: Home screen with error
13. If successful ignition, display will show flame icon
(Figure 15-7)
Figure 15-7: Home Screen While Running
14. Boiler will automatically perform a calibration to
properly set its air-fuel ratio (i.e. O
2
or CO
2
and CO
levels).
