Install Instructions

66
10 Start-up
Installation & Service Manual
- DHW SETPT
•  is is the desired set point temperature of
Domestic Hot Water (DHW) generated by the
unit. Note that the required anti-scald mixing
valve will likely require a setting greater than the
desired DHW temperature.
• Range: 60°F – MAX DHW SETPT
• Default: 120°F
- DOMESTIC HOT WATER BOILER WATER TEMP
(BOILER ONLY)
•  is is the desired temperature of the boiler water
going to the indirect tank.
• Range: 68°F – 190°F
• Default: 180°F
- SPACE HEAT RATE LIMITING (COMBI ONLY)
•  is feature is used when the maximum space
heating load is less than the maximum input
rating of the unit.  is setting will limit the
maximum input rate of the unit for a space
heating demand only (DHW demands will not
be limited).
• Range: 10% – 100%
• Default: 100%
- COMBI PRE-HEAT (COMBI ONLY)
•  e Combi Pre-Heat function can be used to
improve DHW performance and comfort by
maintaining boiler water at an elevated
temperature to be able to immediately serve a
DHW demand. In certain applications, the Pre-
Heat function can also reduce water usage
compared to not using Pre-Heat. Enabling
Pre-Heat, however, can increase fuel usage as the
unit will periodically  re to maintain heated
water.
• Settings: ENABLED/DISABLED
• Default: ENABLED
Check flame and combustion
1. Turn the main power off to the boiler.
2. Remove the flue plug from the vent pipe adapter.
Note: Combustion measurements will be made at this
point.
DIR #2000534695 00
REMOVE THE FLUE PLUG
FROM THE VENT PIPE
ADAPTER
Figure 10-7 Flue Plug Removal
Service mode
⚠ WARNING
 e Noble Fire Tube includes a Service Mode feature
that can be used to force the unit to run at a particular
 ring rate.  is feature can be used by quali ed service
technicians for adjusting combustion or troubleshooting
the unit.
Service Mode can be accessed by holding ► and ▼
buttons simultaneously for 5 seconds.
Combi Models Only: In Service Mode, the unit will
operate with the diverter valve in the space heating
position; therefore, zone(s) in the heating system must be
actively running in order to reject the heat generated.
Entering Service Mode will
immediately cause the boiler to
fire. Failure to ensure that the unit
is fully assembled and installed and
in safe working condition; including
having properly installed venting, all
air purged from the heat exchanger,
and with proper water supply and
flow, can result in serious injury,
death, significant property damage, or
destruction of the heater.
Figure 10-6 Service Menu
Button functions in Service Mode
▲/▼ - Change the target fan speed in increments of 100 rpm.
► - Toggle between operating at high  re and low  re.
◄ - Exit Service Mode and return to the Home Screen.
FIRE TUBE
™