Settings shortcuts: Boiler tips

Short, practical technician tips on settings shortcuts for boiler. Check each one against the manual for your exact model before acting.

Change display units and run the display test

Glow Brand · B85, B120, B160 (NG and LP)

User-level settings, no code needed.

1. 901 = temperature unit C/F, 0.902 = pressure unit bar/psi.
2. 997 lights every LCD segment; press any button to leave.

Flue temperature sensor limit

Glow Brand · Flue sensor setting

Default flue limit is 149°F (65°C) for PVC venting. Installer may raise it to 194°F (90°C) for higher CH temperatures, but then parameters must be updated and S636 CPVC venting must be used.

1. Leave the flue limit at 149°F (65°C) for PVC venting.
2. To go higher, set the new limit in the parameters, and use S636 CPVC vent per Section 4.5.1.

Change gas type with DIP switch 2

Navien · Navien NHB-H condensing boilers: NHB-150H, NHB-110H, NHB-080H, NHB-055H

DIP switch 2 #1 sets natural gas or propane and must match the rating plate and the Start-up Wizard.

1. Turn power off before removing the front cover.
2. DIP switch 2, #1: OFF = natural gas, ON = propane.
3. SW2 #1 must match the gas on the rating plate (E788 if wrong).

Set the altitude with DIP switch 2

Navien · Navien NHB-H condensing boilers: NHB-150H, NHB-110H, NHB-080H, NHB-055H

DIP switch 2 #2 and #3 select the altitude band.

1. 0-1,999 ft: 2 OFF, 3 OFF.
2. 2,000-5,399 ft: 2 ON, 3 OFF.
3. 5,400-7,699 ft: 2 OFF, 3 ON.
4. 7,700-10,100 ft: 2 ON, 3 ON.

Adjust parallel shift from home screen

NTI · NTI TRX boilers in AUTO outdoor reset

Parallel shift moves the reset curve up or down from the home screen. It can only be changed when Auto Boost is OFF (4.7.5 = 0).

1. Press CH + or - once to show the current CH target temperature.
2. Wait 3-5 seconds until the offset starts flashing.
3. Press CH + or - again to shift the curve up or down.
4. Wait a few seconds for the new target to show, then the display returns to home screen.

Central heating (CH) setpoint adjustment

NTI · TRX150 with CH heating

CH setpoint is changed on the home screen with the CH +/- buttons. The range is limited by the Max and Min temperature parameters (examples 4.2.5 and 4.2.6) in the technical menu. With AUTO outdoor reset on, the CH setpoint is calculated and can be shifted up or down with CH +/- from the home screen.

1. From the home screen, press CH + or - to set the CH temperature.
2. If AUTO is on, press CH + or - to shift the calculated setpoint.
3. If the range is wrong, check parameters 4.2.5 and 4.2.6 in the technical menu.

Domestic hot water (DHW) setpoint adjustment

NTI · TRX150 combi models

DHW setpoint is changed from the home screen with the DHW +/- buttons. Range is 97 to 140 °F. The old value flashes while changing. Not applicable to non-combi models that use an aquastat. Water above 125 °F can cause severe burns or death, and at 140 °F scalding can occur in under 5 seconds.

1. From the home screen, press DHW + or - to set the DHW temperature (97 to 140 °F).
2. Confirm the new setpoint is as low as the application allows.
3. Warn users that the water can scald; check the water temperature before bathing.

Lead-lag cascade setup shortcuts

NTI · Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399

Where the cascade settings live on the touchscreen.

1. Give every boiler a different MB2 Modbus address under Configure - System Identification & Access
2. On one boiler only set Master enable under Configure - Lead Lag Master Configuration
3. Make the CH and DHW setpoints and outdoor reset changes on the master only
4. On the boilers that run the CH and DHW pumps tick Use for Lead Lag Master demands under Pump Configuration

View the last 10 boiler errors

NTI · TRX boiler

Parameter 8.6.0 lists the last 10 errors stored by the boiler, from ERROR 0 to ERROR 9, each with its code and the day, month and year it occurred. The history can be cleared with parameter 8.6.1.

1. Open the complete menu.
2. Go to parameter 8.6.0 and scroll through ERROR 0 to ERROR 9.
3. Note each error code with its date.
4. To clear the history, go to 8.6.1 and press OK to reset (ESC cancels).

Change a parameter in the PARA chapter

Rinnai · E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Installer parameters live in the PARA chapter. Navigation is MODE for chapter, STEP for the item, + / - for the value and STORE to save.

1. Enter the installer code C123
2. Press MODE until PARA appears
3. Press STEP to reach the parameter number
4. Adjust with + or -, then press STORE
5. Press MODE until StBY or Good shows to leave; it also times out after 20 min

Where the fault history lives

Viessmann · Vitodens 200-W B2HE 85, 120, 150, 199

The message history keeps the 10 most recent faults with their subscriber numbers (CAN 1 HMU, CAN 50 BCU, CAN 59 HMI, CAN 60 fan, 81 MZIO).

1. Service menu > Message history