Robur GAHP-AR, Installation, Use And Maintenance Manual

Normal operation 

Installation, use and maintenance manual – GAHP-AR 

35

6

Should the burner fail to light, or flame is not detected during 

the first trial for ignition, the gas valve and ignition transformer 

are de-energized and the ignition control box begins an inter-

purge delay before another ignition attempt. The control will 

attempt two additional ignition trials (total of 3 ignition trials) 

before going into lockout. Upon lockout, the gas valve will de-

energize immediately and the pre-mixer blower will turn off.

The thermostat (“W” terminal), air pressure switch and burner 

flame are constantly monitored to assure proper system opera-

tion. When the call for flame has ended (24 V removed from “W” 

terminal on ignition control), the gas valve is de-energized im-

mediately. The ignition control then senses loss of flame and de-

energizes the pre-mixer blower.

To reset the flame controller lockout, refer to the procedure giv-

en in Paragraph   

p. 38.

5.7 

 MODIFYING  SETTINGS

Modify settings via the DDC

If the device is connected to the DDC control, refer to the 

relevant manual to modify settings.

If any information (menu, menu entries, parameters 

and/or values, etc.) is visualized on the display in flashing 

mode, it means that this information couldn’t be entered.

When information is not available, the display visualizes 

.

How to raise/lower the water temperature setpoint

The water temperature setpoint establishes the outlet tempera-

ture to the system (water output from the appliance), or inlet 

from the system (water input in the appliance). The temperature 

is pre-set by the AT upon first start-up.

If the appliance is not connected to a DDC control, to 

raise/lower the water temperature setpoint with the S61 

board, proceed as follows:

1. 

Access menu 3 under parameter 161 or 075 (= hot or 

chilled water temperature setpoint) by rotating and 

pressing the knob; "3.161" must be displayed in heating 

mode or "3.075" in cooling mode (procedure Paragraph 

5.6 

p. 33).

2. 

Display the parameter value by pressing the knob; the 

previously set value is displayed (from 37.4 to 140 °F); to 

reconfirm the pre-existing value press the knob again, 

otherwise go to step 3.

3. 

Turn the knob to modify the value, increasing or decreas-

ing it, and press it to set the new value.

4. 

Exit menu 3, and from the menu list, by selecting and 

pressing letter "E" twice, and go back to the normal dis-

play of detected temperature data.

Do not modify complex settings

Specific technical and system knowledge is required for 

complex settings. Contact an AT.

6  

 NORMAL  OPERATION

This section is for the end user.

6.1 

 WARNINGS

General warnings

Prior to using the appliance carefully read the warnings 

in Chapter III.1 

p.  4, providing important information 

on regulations and on safety.

First start-up by AT

First start-up may exclusively be carried out by a Robur 

AT (Chapter 5 

p. 30).

Never power the appliance off while it is running

NEVER power the appliance off while it is running (ex-

cept in the event of danger, Chapter III.1 

p.  4), since 

the appliance or system might be damaged.

6.2 

 SWITCH ON AND OFF

Routine switching on/off

The appliance may exclusively be switched on/off by 

means of the suitably provided control device (DDC or 

external request).

Do not switch on/off with the power supply switch

Do not switch the appliance on/off with the power sup-

ply switch. This may be harmful and dangerous for the 

appliance and for the system.

Checks before switching on

Before switching on the appliance, ensue that:

„

gas valve open

„

appliance electrical power supply (main switch (GS) ON)

„

DDC power supply (if any)

„

water circuit ready

How to switch on/off

The appliance may be turned on/off, in heating or cooling mode 

by seasonal heating/cooling switching, to alternatively produce 

hot water or chilled water, according to climate control needs.

▶

If the appliance is controlled by a DDC, refer to the relevant 

manual.

▶

If the appliance is controlled by an external request (e.g. 

thermostat, timer, switch, ... with NO voltage-free contact), 

the appliance is switched on/off by the ON/OFF positions of 

the external control device, with heating/cooling seasonal 

change through winter/summer switching (contacts R = 

common, W = winter, Y = summer, board S61, see Paragraph 

4.4 

p. 26).

Switch on

Select the operating mode required (cooling or heating) using 

the summer/winter selector switch, if the desired mode is not 

already selected.