Optional Controls - McQuay seasoncon ALP-067A Installation And Maintenance Data

OPTIONAL CONTROLS

Dampertrol - Optional Head Pressure Control
Dampertrol is an optional system for reducing condenser capacity. It
consists of an assembly of damper blades, linkages and blade operators
installed over the first fan turned on by Fantrol (Fan No. 11) and
arranged to operate as shown.
pressure and extend or contract in response to the pressure to open
or close the damper blades as required to maintain adequate conden-
ser pressure.
damper blades at 170 + 5 PSIG and to be fully open at 250 2 10 PSIG.
To check the damper blade operator pressure settings, the unit should
be started with the fuses removed from fans 11 and 13 (on 3 fan units
only).
At condenser pressures below 170 & 5 PSIG, the damper blades
should be completely closed.
the damper blades should begin opening and be fully open at 250 +_
10 PSIG. Leaving the fuses in on fan 12 will prevent head pressure
from becoming excessive since this fan will start after the fully
open setting of the damper operators has been observed.
page 46
The operators are factory set to begin opening the
As pressure rises above 170 & 5 PSIG,
DAMPERTROL IN OPEN POSITION
DAMPERTROL IN CLOSED POSITION
The blade operators sense condenser
1
UNIT CONDENSER
DAMPER SECTION
UNIT CONDENSER