Central Heating Rinnai I-Series Natural Gas User Guide

: September 16, 2024
: Central Heating

Table of Contents

Commissioning
From The Boiler PCB
Operation
Connection of External Accessories
Parameters and Features
Errors and Troubleshooting
Customer Support
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Central Heating Rinnai I-Series Natural Gas

Commissioning

This document must be read in conjunction with the I-Series Boiler Installation Manual provided with the unit. It is essential the manual is read and followed to ensure the installation is as per manufacturer’s specification. The purpose of this document is to assist with the commissioning of the boiler and parameters and connection of third party controls.

Pre Commissioning

Ensure the boiler and flue are installed in accordance with the installation manual and the gas code.
Ensure the power is isolated from the unit.
Remove the front cover of the unit to expose the water pump and electrical enclosure etc.
Ensure all electrical connections are made as per manufacturers or CHNZ wiring diagrams.
Ensure hydronic connections of the boiler and all accessories are correct and as per design.
Ensure condensate drain is connected using suitable materials (PVC) and trap is primed. Ensure drainage is to an appropriate location.
Ensure that the boiler is supplied with the correct static gas pressure.
Check the pre-charge of the system expansion vessel(s) is set to 1 bar with a static system pressure of 0 Bar.

Natural gas – Min supply pressure 1.13 kPa, Max supply pressure 3.0 kPa.

Failure to observe the above may result in incorrect operation of the boiler.

Filling the System with Water

Ensure all valves are open and thoroughly flush the system with a flushing cart, or suitable mains pressure, until there is no sign of air returning through the primary feed pipes. This will remove most of the air from the system.
Now ensure boiler and system AAVs are open and pressurize the system to 1 Bar on the system pressure gauge.

DE aeration Function

From The Boiler Control Panel

The boiler de aeration function can be enabled by pressing and holding the DHW button then simultaneously press the CH button on the control panel (shown below).
The de aeration function will last approximately 15 minutes and the boiler display will show “END” when this function is complete.
Ensure system AAVs are closed once de aeration is completed.

From The Boiler PCB

The boiler de aeration function can be enabled by pressing and holding the top left black button on the boiler PCB (shown below) for 3 seconds.
The de aeration function will last approximately 15 minutes and the boiler display will show “END” when this function is complete.
Ensure system AAVs are closed once de aeration is completed.

Operation

Control Panel Navigation

MODE: Select various boiler settings.
UP/DOWN ARROWS: Scrolls through available menu options including adjusting the temperature.
ECO: Selects Eco or Comfort operation mode.
CENTRAL HEATING (CH): From the factory, this option is turned off by default. The boiler runs off thermostat inputs on the control board. For any adjustments, contact a trained and qualified professional for setting assistance.
DOMESTIC HOT WATER (DHW) ON: Press to run the boiler in Domestic Hot Water mode.
SWITCHING OPERATION MODE: Press to change the display between DHW and CH for temperature setting.
SELECT BUTTON: Press to select the option in the display window.
DISPLAY WINDOW: Display boiler status information. See Display Window sect on for more information
CH BUTTON LED: When the LED light above the CH butt on is illuminated, CH mode is active.
DHW BUTTON LED: When the LED light above the DHW butt on is illuminated, DHW mode is active.

Display Identification

MAINTENANCE MODE ICON: Appears when the boiler is in Parameter Settings Mode, De aeration Mode, Performance Data Mode, Error History Mode, etc.
ECO SETTING ACTIVE: Eco maintains temperature in the primary heat exchanger to provide quicker delivery of hot water to fixtures.
CENTRAL HEATING MODE ACTIVE
DOMESTIC HOT WATER ACTIVE
OUTDOOR TEMPERATURE SENSOR CONNECTED
FREEZE PROTECTION ACTIVE
UNIT OF MEASUREMENT FOR TEMPERATURE
UNIT OF MEASUREMENT FOR PRESSURE: Pressure and temperature are alternately displayed on the controller.
SET POINT TEMPERATURE, CURRENT TEMPERATURE OR CURRENT PRESSURE, AND DIAGNOSTIC INFORMATION
PRIORITY CONTROL
FLAME ESTABLISHED LIGHT: Boiler has fired and is operating.

Connection of External Accessories

The Rinnai I-Series can be configured to use an external thermostat for heating control, control additional circulating pumps and accept an outdoor sensor.
Follow the below instructions regarding connection and configuration.

Connection of an External Thermostat

External thermostats using volt free normally open (NO) contacts should be connected to terminals T/T (Terminal #4) found at the bottom of the boiler PCB. See figure 1. To enable the boiler to accept an external demand, DIP Switch 2 should be changed to the ON position (up).

Connection of an External Pump for Heating

If using an additional external circulating pump, it should be connected to terminals “System Pump” (terminal #3) found on the left-hand side of the boiler PCB.
See figure 1. See parameter list for configuration.

Connection of an Outdoor Temperature Sensor

Connection of an outdoor temperature sensor should be made to terminals Outdoor TH (terminal #6) found at the bottom of the boiler PCB. See figure 1.
To enable the boiler to accept an outdoor sensor, DIP Switch 1 should be set to the ON position (up). See Parameters section regarding outdoor climatic curve settings.

Terminal #	Description	Notes
1	Internal Pump Connection	230V AC
2	External Pump Connection (DHW)	230V AC, 2A Max
3	External Pump Connection (Heating)	230V AC, 2A Max
4	External Thermostat 1 (T/T)	Low voltage only
5	External Thermostat 2 (DHW, T/T2)	Low voltage only
6	Outdoor Temperature Sensor	10k @25°C

Parameters and Features

PCB and DIP Switches Identification

To access the PCB, remove the boiler’s front panel by removing the four screws that secure the panel in place. Use the diagram below to identify buttons and DIP switches.

Item #	PCB Button	Primary Function	Notes
1	Button #1	Forced High/Low Fire Modes	Refer to section “12.9 Forced Hi/Low

DIP Switch Settings

DIP Switch #| Function| Description| OFF (default)| ON
---|---|---|---|---
1| Outdoor Temperature Sensor| Enables or disables the Outdoor Temperature Sensor| Outdoor Temperature Sensor not in use| Outdoor Temperature Sensor in use
2| Thermostat usage| Changes the mode between external Thermostat control or boiler control| Central Heating ON butt on used. Boiler fires based on return water temperature| Thermostat used
3| DHW Recirculation| Enables the DHW Recirculation function for Pump 2 connection| Pump 2 Connection Enabled for Second CH Zone Pump| DHW recirculation ON (Pump 2 connection for DHW Recirculation Pump)
4| Simultaneous Central Heating and Domestic Hot Water| Enables simultaneous operation between Central Heating and Domestic Hot Water| Domestic Hot Water Priority (Heating OR Hot Water)| Simultaneous Central Heating and Domestic Hot Water Permitted
5| Gas Valve Solenoid| Shuts down the integrated solenoid gas valve manually| Normal Operation| Fixed Closed (Prevents boiler operation)
6| Altitude Setting| Sets the appropriate elevation of the boiler installation| Depends on altitude (See altitude section 8.5.3 for specific values)
7| Altitude Setting
8| Vent Type Selection| Not used in NZ (do not alter)| N/A| N/A

Accessing Boiler Parameters

To access the parameters available on the boiler display, follow the below steps.

Remove the boiler’s front panel by removing the four screws that secure the panel.
Locate the PCB (Lower left side of unit)
Locate the red button on the PCB
Press and hold the red button for five seconds
Press the Mode button on the controller
Press the Up or Down arrows to select a parameter setting number. Then, press the Select button.
Press the Up or Down arrows to change the parameter number (such as 11-A or 11-b). Then, press the Select button on the controller to confirm.
To exit the parameter settings and return to normal operation, press either the red button on the PCB or the Mode button on the controller.

List of Key Parameters Below is a list of key parameters identified by CHNZ to suit most standard boiler installations. For more bespoke control and fine tuning of specific parameters please reference the full I-Series manual 8.6.2 Parameter Settings Table.

Parameter #	Description	Default	Set To
01	**Outdoor Climatic Curve Control

This parameter is available when Dip Switch 1 is in the ON position. Select the appropriate curve below.
Curve 1: Standard fan coils, radiators.
Curve 2 : Underfloor Heating.
Curve 3: High temperature fan coil or undersized low level fan coil.
Curve 4: Custom curve based on customer input.See section 8.6.3 of I-Series manual for more info.| Curve 1| Based on emitter type
10| Max DHW Set Point Temperature
** This selects the maximum limit DHW can be set to.
*Reduce to 55°C if there is no tempering valve installed| 60°C| See Note in Description

11

| Time diverter valve stays in DHW position
(Only relevant in DHW priority mode, when DIP switch 3 and 4 is in the ‘OFF’ position)| 3 Minutes| 10 Seconds
14| CH temperature limitation during Simultaneous Operation
This parameter is available when DIP switch 3 or 4 is in the ‘ON’ position. This enables the CH temperature setting to be limited during simultaneous DHW and CH operation. This can prevent unintentionally supplying high temperature water to low temperature CH applications during simultaneous operation. When selecting ‘NO’ limitation, the flow temperature may be up to 82°C regardless of the temperature set on the boiler. Ensure that the CH system and heating application is designed for high temperature.| Yes| Yes
41| Linked Operation between Main Boiler Pump and CH Pump 1
This parameter is only in use when DIP switch 2 is in the ON position. This enables the linked operation between the main boiler pump and CH Pump 1. For example, when the main pump is on, pump 1 is also on.
When DIP switch 2 is in the OFF position, the pumps are automatically linked.| No| Yes (Linked together. If selected, hydraulic separation is required
01| Outdoor Climatic Curve Control
This parameter is available when Dip Switch 1 is in the ON position. Select the appropriate curve below.
Curve 1: Standard fan coils, radiators.
Curve 2: Underfloor Heating.
Curve 3 : High temperature fan coil or undersized low level fan coil.
Curve 4: Custom curve based on customer input.
See section 8.6.3 of I-Series manual for more info.| Curve 1| Based on emitter type

Errors and Troubleshooting

To reset errors, the Central Heating or Domestic Hot Water button on the control panel will be blinking. Press the button to reset the code.
At the point of commissioning, a common error is 640 (Insufficient water flow). This is likely caused by air still being present in the system or installation debris blocking the filter ball valve. Check and clean the filter ball valve installed at the boiler and reset. For all other faults, please refer to the manufacturer’s instruction manual.