York YPAL 051, YPAL 061, YPAL 050 LOW Fire / High Fire Pressures, GAS Heat Performance Data, Gas

Startup

•Check the supply pressure. It must be within the limitations shown in Table 3-2. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the standby gas pressure exceed 13.5" WC, nor the operating pressure drop below 4.5" WC for natural gas or 11.0" WC for propane. If the gas pressure is out- side these limits, contact the installing mechanical contractor for corrective action.

•The flame is stable, with flame present only at the end of the burner, no burning is occurring inside the burner. There should be little yellow tipping of the flame.

•There may be some smoke thru the flue, due to tooling oil burning off of the heat exchanger tub- ing.

TABLE 3-2 – LOW FIRE / HIGH FIRE PRESSURES

TYPE OF	LINE PRESSURE		MANIFOLD PRESSURE
			LOW FIRE	HIGH FIRE
GAS	MINIMUM	MAXIMUM
			+/- 0.3 “WC	+/- 0.3 “WC
NATURAL	4.5 “WC	13.5 “WC	1.2 “WC	3.5 “WC
PROPANE	11.0 “WC	13.5 “WC	4.2 “WC	10.0”WC

HIGH FIRE PRESSURE

REGULATOR

REGULATOR VENT COVER

		LOW FIRE
		PRESSURE
		REGULATOR
	TWO STAGE
	PRESSURE
	REGULATOR
INLET		LD11760a

FIG. 3-2 – MANIFOLD GAS PRESSURE

ADJUSTMENT

FORM 100.50-NOM6 (1207)

Manifold Gas Pressure Adjustment

•Small adjustments to the manifold gas pressure can be made by following the procedure outlined below. Refer to Figure 3-2 for the high and low fi re pressure regulator adjustment locations.

•Turn the gas off to the unit.

•Use a 3/16 inch Allen wrench to remove the 1/8 inch NPT plug from the outlet pressure tap of the valve.

•Install a brass adapter to allow the connection of a hose to the outlet pressure tap of the valve.

•Connect the hose to a manometer capable of read- ing the required manifold pressure value.

•Turn the gas back on.

•Place the heat section into high fire operation.

•Compare the high fire manifold pressure to Table 3-2.

•To adjust the high fire manifold pressure remove the cap from the high fire pressure regulator. Use a 3/32Allen wrench to make the manifold pressure adjustment. To increase the manifold pressure, turn the screw clockwise; to decrease the manifold pressure, turn the screw counterclockwise. Place your finger over the adjustment opening while verifying the manifold pressure.

•Place the heat section into low fire operation.

•Compare the low fire manifold pressure to Table 3-2.

•To adjust the low fire manifold pressure remove the cap from the low fire pressure regulator. Use a 3/32 inch Allen wrench to make the manifold pressure adjustment. To increase the manifold pressure, turn the screw clockwise; to decrease the manifold pressure, turn the screw counter- clockwise. Place your finger over the adjustment opening while verifying the manifold pressure.

•Turn the heat off.

•Turn the gas off.

•Remove the brass tubing adapter and replace the plug in the outlet pressure tap.

TABLE 3-3 – GAS HEAT PERFORMANCE DATA

	GAS INPUT CAPACITY	MAXIMUM OUTPUT CAPACITY	AIRFLOW		TEMP. RISE
UNIT	(BTU/HR X 1000)	(BTU/HR X 1000)	MIN.	MAX.	(°F)
50-61	375	300	7,500	24,000	40
	750	600	14,000	24,000	40
	1125	900	21,000	24,000	40

54 JOHNSON CONTROLS