With all high efficiency boilers, care must be taken to minimize condensation. Therefore, cold standby is not recommended and may be used only with a piping, bypass as shown on Figure 12. This requires a change in control wiring. Please contact factory prior to making that change.

When cold standby is not utilized, the homeowner might possibly object to the burner starting when space heat is not required. To avoid this, an optional outside thermostat may be used to shut down the system totally when outside temperature is above a specific limit set by the homeowner. When outside thermostat is not used, Jumper T-T Terminals on relay.

L8151 CONTROL SETTINGS

Use the following setting for the first adjustment:

High Limit Set Point

180°F

Low Limit Set Point

160°F

Differential

20°F

These settings may be altered based on the heating system response. During very cold weather if the heating system does not provide quite enough heat, the high limit control setting may be raised to a maximum of 200°F. If more domestic hot water is required, the low limit control setting may also be raised to a maximum of 180°F. Whenever adjusting either the high or low limit the high limit control setting must be set at least 20°F above the low limit. The differential control setting is typically 20°F but may be adjusted to vary the time it takes the burner to respond to a call for domestic hot water.

Oil Burner and Controls Start-Up and Adjustment

INDOOR DIRECT EXHAUST BOILERS

Instruction manual enclosed in burner carton must be followed in regard to start-up and adjustment

1.A Beckett model AFG post-purge oil burner is normally supplied with boilers to be fired at 2.00 gph or less. It is equipped with an F3 flame retention head, the size most commonly used. It is possible the head must be changed to match the nozzle firing rate required, and it is recommended the installer carry a complete assortment of Beckett flame retention heads. When head ratings overlap, a smaller head with air shutter fairly well open will generally provide better combustion than a larger head with air shutter near closed.

SEE HEAD SIZE SELECTION CHART ON PAGE 16. SUGGESTED NOZZLES, HEADS, AND PRELIMINARY SETTINGS FOR VARIOUS FIRING RATES ARE SHOWN ON PAGE 40.

2.At firing rates above 2.00 gph, a special Beckett model CF375 burner must be used and is supplied if specified by purchaser.

3.Post-purge oil burners are supplied with pump pressure set at 140 psi. Nozzle output will be approximately 18% greater than that at 100 psi.

4.The burner is not supplied with a nozzle. The correct nozzle is the smallest which will do the job properly. Long continuous runs with minimum starts and stops conserve the most energy. The nozzle which provides the highest C02 with the least smoke for a particular application is always recommended.

5.WARNING: Too low a firing rate can cause excessive condensation within the boiler and flue resulting in severe rust and corrosion. A piping by-pass is recommended to minimize this problem. See Figure 12.

6.If Beckett AFG burner is to be fired at less than 1.00 gph, it is possible that a low firing rate baffle will be required. For firing rates not specified on page 40, see chart below on which an “x” indicates that a baffle is necessary. See also instruction sheet with baffle in burner carton.

HEAD

FIRING RATE, GPH

LOW FIRE BAFFLE

 

.50

X

F0

 

 

.65

X

 

 

 

 

.75

 

 

 

 

.75

X

 

 

 

F3

.85

X

 

 

.90

 

 

 

 

 

1.00

 

 

 

 

.85

X

F6

 

 

.90

X

 

 

 

 

1.00

7.Using three acorn nuts, studs and washers from hardware package, fasten burner to mounting plate. Do not disturb chamber when inserting firing head.

8.Mount L8151 control on boiler jacket above and to the right of burner using sheet metal screws in holes located in jacket. Wiring harness is provided. When well is used at the rear of a larger boiler, it might be necessary to relocate the control with longer wiring not provided.

9.If boiler has a tankless coil, insert well for the L8151 remote bulb in coil plate. Run capillary tube through sight glass opening in jacket.

10.If a tankless coil is not used, install 3/4" well and bulb with a bushing either in the 1 1/2” supply opening opposite the one used to feed radiation, or in a reducing tee in the 1 1/2” supply opening that feeds radiation.

11.Mount overfire pressure switch at upper right of burner on screws already in jacket. Connect by 1/4" copper tube to brass tee at upper left of burner.

Burner will shut down if overfire pressure reaches .17" H2O due to a plugged flue or high wind. If high wind causes nuisance shutdowns, mount switch on an angle bracket with diaphragm horizontal. Shutdown will then occur at .25" H2O.

17

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Ultimate Products PF Series manual L8151 Control Settings, Indoor Direct Exhaust Boilers

PF Series specifications

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