Direct To Reverse Acting; Negative To Positive Compensation (Rp920B And D) - Honeywell RP920A-D Service Data

PROPORTIONA
ADJUSTMENT
Fig. 14.

DIRECT TO REVERSE ACTING

1. Loosen the four screws (Fig. 15) on the proportional
module.
2. Remove the module. Rotate the module and its gasket
180 degrees and reinstall. Ensure that the notch on the
module lines up with the proper indication on the
base.
3. Retighten the four screws.
4. If required, recalibrate.
PROPORTIONAL M O D U L E
DIRECT
NOTE LOCATION
0 F NOTCH
Fig. 15. Changing Controller Action
ADJUSTMENT
COMPENSATION
Adjustment Locations.
CAPTIVE SCREWS
REVERSE ACTING
NEGATIVE TO POSITIVE COMPENSATION
(RP920B and D)
Positive compensation is used for summer compensation
or humidity reset applications.
Loosen the four screws on the compensation module
(Fig. 16).
Remove the module. Rotate the module and its gasket
180 degrees and
module lines up with the proper indication on the
base.
Retighten the four screws.
If required, recalibrate.
COMPENSATION
NEGATIVE COMP.
(FACTORY SET)
Fig. 16. Changing from Negative to Positive
lNTEGRAl_ ACTION CUT-OFF AND GAGE FUNC-
TION (RP920C and D)
1. Check the position of the gasket tab (Fig. 17). The
position of the gasket located under the switch block
module determines the function of the field-installed
gage on the switch block module and determines if the
integral action cut-off function is enabled or disabled,
See Table 2 for factory and field settings.
Table 2. Switch Block Module Gasket Position.
RP920B
RP920C
RP920D
B = Branch Line Gage
C = Compensation Sensor Gage
=
Enabled
11
reinstall.
Ensure that the notch on the
MODULE
CAPTIVE SCREWS (4)
POSITIVE COMP.
7 '
NOTE LOCATION
OF NOTCH.
Compensation,
B C
B
C,
B
Action Cut-Off
85-O 142