York ARC 045, Installation Manual

Page: 35 / 52

2. Check that the pressure of the supply gas is within the limits designated on the rating plate.
3. The supply pressure at full output should be checked for all gas appliances in the building.
4. Pressure in the gas supply line should never exceed 25 mbar In units powered by natural gas, the
operating pressure should never fall below 12.5 mbar.
N O T E
If the gas supply is outside these limits, contact the gas utility company or your local representative for
corrective measures.
5. Check that gas pressure in the manifold is correct. See Pulley adjustment (models 045/060/075: 1
groove; models 090: 2 grooves) , see on page 31 .
6. Check that the flame in the burners is completely
blue.
A. Burner
B. Heat exchanger tube
C. Burner flame
D. Pilot tube
E. Supply manifold
7. After 15 minutes operating and using a combustion
gas analyser, test the CO, CO
2
and Nox content, if
possible, in the discharge of the flue passage. With
both stages of heat operating, the carbon monoxide
(CO) content should be less than 0.1 % (1000 ppm).
The CO/CO2 ratio should be less than 0.02.
Pulley adjustment (models 045/060/075:
1 groove; models 090: 2 grooves)
Loosen the nuts -A-. Never loosen nuts -C-.
Loosen the belts by turning the screw -B-.
Loosen the set screws -D- to release the mobile rim -
E-.
To increase or decrease the opening of the pulley,
turn the mobile rim -E- on the thread of the fixed core
of the pulley in the appropriate direction.
Apply sealant to the threads of the set screws. -D- and
fully tighten, checking that they match up to their
housing in the fixed core of the pulley.
1.
Pulley completely closed (maximum diame‐
ter). Maximum air flow.
2.
Pulley completely open (minimum diameter).
Minimum air flow.
DP Pulley diameter
Installation manual 1
Instructions for starting up the unit 1.16
31