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CAUTION
The following procedures should only be performed by a qualified service technician.
15.MINIMUM INPUT ADJUSTMENTS
This section covers Minimum Input Adjustments on Honeywell V8944B Diaphragm Type
Valves, Honeywell V5055B Fluid Power Gas Valves equipped with either a V4062A
a.Minimum Input Adjustments –
On boilers equipped with the V8944B combination diaphragm valve/regulator, Low Fire Adjustment should not be less than Minimum Input shown on Rating Plate (1/3 of full rated input). Fig. 57 shows the outlet pressure adjustment screws for low and high fire. The V8944B low and high fire pressure settings are factory set at 0.8” and 3.5” W.C. respectively. If further adjustments are necessary, remove pressure regulator adjustment caps and insert a screwdriver to raise or lower the regulator pressure.
Fig. 57
V8944B COMBINATION VALVE
b. MINIMUM INPUT ADJUSTMENTS –
(1) | With power to actuator “off”, remove the |
| wiring compartment cover. |
(2) | Check to be sure the low fire adjustment is set |
| at MAX to insure a safe |
| adjustment is preset at factory in the MAX |
| position.) |
(3) | Disconnect the controller lead from terminal #4 |
| on the actuator to keep the valve in the low fire |
| position. |
(4) | Start the system and establish the main burner |
| flame. |
(5) | Loosen the setscrew in the cam (Fig. 58A) with |
| the special wrench taped to inside of actuator |
| cover. Keep the wrench seated in the setscrew. |
| Rotate the cam slightly downward (by moving |
| the wrench toward the base of actuator) to open |
| bleed valve. Actuator will start to close. |
(6) | When valve reaches desired low fire position, |
| quickly tighten setscrew and remove wrench. If |
| the desire low fire setting is “missed”, merely |
| loosen the setscrew and rotate cam in the |
| opposite direction to the desired set point. |
(7) | Shut down burner, and then restart. Repeat |
| several times to be sure the low fire setting |
| is that desired and suitable for correct burner |
| lightoff. Readjust if necessary. |
(8) | Disconnect power and reconnect controller lead |
| removed in step (3) above. |
(9) | Replace the wiring compartment cover. |
c. MINIMUM INPUT ADJUSTMENTS – | |
MOTORIZED “MODULATING” ACTUATOR, | |
V9055A | |
On boilers equipped with Fluid Power Valves that | |
have “Modulating” Actuators, Low Fire Adjustment | |
should not be less than Minimum Input shown on | |
Rating Plate (1/3 of full rated input). | |
Fig. 58B shows the Low Fire Adjusting Screw | |
for increasing or decreasing low fire input on the | |
Honeywell V9055A “Modulating” Actuator. To | |
adjust the low fire setting after the burners are “on”, | |
the following procedure should be used. | |
(1) | With power to actuator “off”, remove the wiring |
| compartment cover. |
(2) | Check to make sure the low fire adjustment is |
| set at MAX (full clockwise) to insure a safe |
|
72
On boilers equipped with Fluid Power Valves that have
Fig. 58A shows the Limit Switch Cam and Scales to indicate direction to rotate cam for increasing or decreasing low fire input on the Honeywell V4062A “Lo-Hi-Lo” Actuator. To adjust the low fire setting after the burners are “on”, the following procedure should be used.
| factory in the MAX position.) |
(3) | Remove the lead to V9055A terminal R. |
| Jumper terminal R to W. This will prevent the |
| actuator from going to the high fire position. |
(4) | Energize the system and light the main burner. |
(5) | Use a Phillips screwdriver, or standard type with |
| a blade no more than 3/16 inch wide, to turn |
| the low fire adjusting screw for the desired low |
| fire position. DO NOT PUSH INWARD ON |
| SCREW. |