NOTICE: When the request for heating and/or hot water has been satisfied, the boiler pump and fan may continue to circulate to dissipate any residual heat within the boiler.
7. BOILER FAN SPEEDS
The boiler fan speeds require to be checked and/or adjusted prior to making any adjustments to the gas valve or if the main PCB has been replaced.
ATTENTION
Gas type and appliance fan speed (output) must be set according to the specific appliance specification. Raypak accepts no responsibility if the gas type and/or fan speed is not correctly adjusted according to the respective appliance specification as detailed on the appliance data badge.
CHECKING/ADJUSTING THE BOILER FAN SPEEDS
Move the selector switch to the OFF position and remove the 3- selector knobs.
ABSOLUTE MAX FAN SPEED
Locate the MAX trim pot (Fig. 59) and gently adjust clockwise or counterclockwise to achieve the correct fan speed (see Table 10 below). NOTICE: The display shows the fan RPM in multiples of 1000, i.e. 2.5 = 2500RPM.
ABSOLUTE MIN FAN SPEED
Locate the MIN trim pot (Fig. 59) and gently adjust clockwise or counterclockwise to achieve the correct fan speed (seeTable 10 below).
NOTICE: The display shows the fan RPM in multiples of 1000, i.e. 2.5 = 2500RPM.
IGNITION FAN SPEED
NOTICE: Do this operation only after the adjusting of absolute max and min fan speed.
LocatetheIGNtrimpot (Fig. 59) andgentlyadjustclockwiseorcounter clockwise to achieve the correct fan speed (see Table 10 below).
NOTICE: The display shows the fan RPM in multiples of 1000, i.e. 2.5 = 2500RPM.
HEATING FAN SPEED
Locate the HTG trim pot (Fig. 59) and gently adjust clockwise or counter clockwise to achieve the correct fan speed (see Table 10 below).
NOTICE: The display shows the fan RPM in multiples of 1000, i.e. 2.5 = 2500RPM.
FAN SPEED TABLE
Use the following table to set the corresponding fan speeds that are relative to the boiler you are working on.
| FAN SPEED (rpm) TABLE |
| Tab. 10 |
| ||
| MODEL | MAX | MIN | HTG | IGN |
|
| 85 | 5,800 | 2,000 | 5,800 | 3,700 |
|
| 120 | 5,600 | 1,500 | 5,600 | 3,700 |
|
|
|
|
|
|
|
|
| HTG |
|
| CO | IGN |
|
|
| TMR | MIN | MAX |
|
|
Fig. 59
A |
B |
Fig. 59a |
8.CHECKING THE CO2 AND ADJUSTING THE GAS VALVE THE GAS VALVE MUST BE
Isolate the boiler from the electrical supply and remove the casing as described in Fig. 33. Set the flue gas analyzer to read CO2 and insert the probe into the flue analysis test point (Pos. B in Fig. 59a). Restore the electrical supply to the boiler and switch the boiler to the OFF mode. To adjust the gas valve you must first ensure that the fan speed potentiometers (trim pot) have been set correctly (Tab. 10).
Remove the
9.GAS VALVE MAXIMUM PRESSURE SETTING (Fig. 61) Locate and gently turn the HTG trim pot until the maximum value (max fan speed) is obtained and check that it corresponds with the appropriate CO2 value (Maximum) for the respective boiler (see the data table for values). If the CO2 reading is correct, proceed to gas valve minimum setting. However, if the CO2 reading is incorrect, the maximum gas pressure must be adjusted as follows:
- Using a suitable screwdriver, very slowly turn the maximum pressure adjustment screw (Fig. 60)– clockwise to decrease, counter clockwise to increase – until the correct value is displayed on the CO2 analyzer (allow time for the analyzer to stabilize).
10.GAS VALVE MINIMUM PRESSURE SETTING
Locate and gently turn the HTG trim pot until the minimum value (min fan speed) is obtained and check that it corresponds with the appropriate CO2 value (Minimum) for the respective appliance. If the CO2 reading is correct, rotate the HTG trim pot until the correct value is obtained for the respective appliance (see fan speed Tab. 10). However, if the CO2 reading is incorrect, the minimum gas pressure must be adjusted as follows:
-Remove the sealing screw
-Using a suitable screwdriver, very slowly turn the minimum pressure adjustment screw (Fig. 60) – clockwise to increase, counter clockwise to decrease - until the correct value is displayed on the CO2 analyzer (allow time for the analyzer to stabilize).
COMPLETION
On completion of the combustion analysis check and/or any gas valve adjustment, set the HTG trim pot to the corresponding value as detailed in the fan speed table. Reattach the
DANGER: A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED, REPLACED, OR DISTURBED.
11. COMBUSTION ANALYSIS TEST
A combustion analysis check can easily be carried out on the boiler via the test points located on the top of the appliance.
-Insert the flue gas analyzer probe into the flue gas test point (Pos. B in Fig. 59a).
-Operate the boiler in CO mode and compare the values with those shown in Tab. 1 (Nat. Gas) or Section 13 (LPG). If different adjust the gas valve accordingly.
12. EXTERNAL FAULTS
Before carrying out any troubleshooting or component replacement, ensure the fault is not attributable to any aspect of the installation.
INSTALLATION FAULTS
Symptom | Possible cause |
No display/ignition | Check wiring/check |
| electrical supply |
No hot water | Check external controls |
No heating | Check external controls |
Fault code | Possible cause |
10 | Check gas supply, check |
| flue system, check polarity, |
| check condensate |
|
|
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