PB Heat MIH manual Checking Burner Input, CHECK-OUT Procedure

START-UP PROCEDURES

E.CHECKING BURNER INPUT

1.Refer to rating label mounted on the jacket top panel to obtain the rated BTU per hour input. In no case shall the input to the boiler exceed the value shown on the rating label.

2.Check input by use of the following formulas

(PB Heat, LLC suggests reading meter for 2 Cu. Ft.):

U.S. Customary Units

Input (BTU/Hr.)= 3600 x F x H

T

Where:

3600 – Seconds per hour

F – Cubic Feet of Gas Registered on Meter H – Heat Value of Gas in BTU/Cubic Feet T – Time in Seconds the Meter is Read

SI Metric Units

Input (kW)= 3600 x F x H

T x 3.6

Where:

3600 – Seconds per hour

3.6– Megajoule (MJ) per kilowatt hour (kwhr) F – Cubic Meters of Gas Registered on Meter H – Heating Value of Gas in MJ/Cubic Meter T – Time in Seconds the Meter is Read

3.As an alternative, use Table 7.1(a) and 7.1(b). Use the heating value provided by gas supplier. Use a stopwatch to record the time it takes for 2 cubic feet (0.0566 cubic meter) of gas to pass through the meter. Read across and down to determine rate.

Table 7.1a: Meter Conversion – Natural Gas (U.S. Customary Units)

Burner inputs in Btu/hr for various meter timings and heat values. (Table based on 2 cubic feet of gas through meter).

Time that		Heat Value of Gas
		(Btu/cubic foot)
meter is
read (sec)	1000	1025		1050
25	288000		295200	302400
30	240000		246000	252000
35	205714		210857	216000
40	180000		184500	189000
45	160000		164000	168000
50	144000		147600	151200
55	130909		134182	137455
60	120000		123000	126000
65	110769		113538	116308
70	102857		105429	108000
75	96000		98400	100800
80	90000		92250	94500
85	84706		86824	88941
90	80000		82000	84000
95	75789		77684	79579
100	72000		73800	75600
105	68571		70286	72000
110	65455		67091	68727
115	62609		64174	65739
120	60000		61500	63000
125	57600		59040	60480

Table 7.1b: Meter Conversion – Natural Gas (SI Metric Units)

Burner inputs in kW for for various meter timings and heat values. (Table based on 0.0566 cubic meter of gas through meter).

Time that		Heat Value of Gas
meter is		(MJ/cubic meter)
read (sec)	37.26	38.19		39.12
25	84.36		86.46	88.57
30	70.30		72.05	73.81
35	60.25		61.76	63.26
40	52.72		54.04	55.35
45	46.86		48.03	49.20
50	42.18		43.23	44.28
55	38.34		39.30	40.26
60	35.15		36.03	36.90
65	32.44		33.25	34.06
70	30.13		30.88	31.63
75	28.12		28.82	29.52
80	26.36		27.02	27.68
85	24.81		25.43	26.05
90	23.43		24.02	24.60
95	22.20		22.75	23.31
100	21.09		21.62	22.14
105	20.08		20.59	21.09
110	19.17		19.65	20.13
115	18.34		18.80	19.25
120	17.57		18.01	18.45
125	16.87		17.29	17.71

F.CHECK-OUT PROCEDURE

1.After starting the boiler, be certain all controls are working properly. Check to be sure that the limit will shut off the boiler in the event of excessive water temperature. This can be done by lowering the limit setting until the main burners shut down. When proper limit function is confirmed, return the dial to its previous setting.

2.To check operation of the ignition system safety shut-off features:

a. Standing Pilot:

i)Turn the gas control knob counterclockwise to “PILOT”. The main burner should go out and the pilot should remain lit.

ii)Extinguish the pilot flame. Pilot gas flow should stop within 2-1/2 minutes. Complete shutdown is proven since the safety shut-off valve has stopped main and pilot gas flow.

iii)Reset the boiler by following Lighting Instructions.

iv)Observe boiler operation through one complete cycle.

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