Manifold Gas Pressure Adjustment; Pilot Checkout; Burner Instructions; Typical Gas Valves - York SUNLINE MAGNUM WJ240 Installation Manual

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly
could result In serious injury, death or property
damage.
Never test for gas leaks with an open flame. A
Fire or explosion may result causing property
damage, personal injury or loss of life.
Use a commercially available soap solution
made specifically for the detection of leaks.
2. Check for correct manifold gas pressures. See
"Checking Gas Input" page 66.
3. Check the supply gas pressure. It must be within
the limits shown on rating nameplate. Supply pres-
sure should be checked with all gas appliances in
the building at full fire. At no time should the
standby gas line pressure exceed 13", nor the
operating pressure drop below 5.0" for natural gas
units. If gas pressure is outside these limits, con-
tact the local gas utility for corrective action.
FIGURE 24 - TYPICAL GAS VALVES

MANIFOLD GAS PRESSURE ADJUSTMENT

Small adjustments to the high-fire gas flow may be
made by turning the pressure regulator adjusting screw
on the automatic gas valve.
Adjust as follows:
1. Remove the cap on the regulator. It's located next
to the push-on electrical terminals.
Johnson Controls Unitary Products
2. To decrease the gas pressure, turn the adjusting
screw counterclockwise.
3. To increase the gas pressure, turn the adjusting
screw clockwise.
The correct manifold pressure for these fur-
NOTE:
naces is 3.65 IWG ±0.3.
B U R N E R A S S E M B L Y B R A C K E T
C A R R Y - O V E R T U B E
FIGURE 25 - PROPER FLAME ADJUSTMENT

PILOT CHECKOUT

The pilot flame should envelope the end of the flame
sensor. To adjust pilot flame, (1) remove pilot adjust-
ment cover screw, (2) increase or decrease the clear-
ance for air to the desired level, (3) be sure to replace
cover screw after adjustment to prevent possible gas
leakage.
Put the system into operation and observe through
complete cycle to be sure all controls function properly.

BURNER INSTRUCTIONS

To check or change burners, pilot or orifices, CLOSE
MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF
ALL ELECTRIC POWER TO THE UNIT.
1. Remove the screws holding either end of the mani-
fold to the burner supports.
2. Open the union fitting in the gas supply line just
upstream of the unit gas valve and downstream
from the main manual shut-off valve.
3. Remove the gas piping closure panel.
4. Disconnect wiring to the gas valves and spark ignit-
ors. Remove the manifold-burner gas valve
assembly by lifting up and pulling back.
284812-YIM-D-1008
F L A M E S E N S O R B U L B
1 / 8 " G A P B E T W E E N C A R R Y - O V E R
T U B E A N D F L A M E S E N S O R B U L B
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