Installation manual

035-19084-001-D-0504

Unitary Products Group 55

the unit into the reheat mode. While in the reheat

mode, the unit operates both stages of compression

and the one reheat coil.

When the room thermostat calls for first stage cooling

while there is still a call for dehumidification, no opera-

tional change is made. The unit continues to operate

both stages of compression with system #1 in the

reheat mode.

When the room thermostat calls for second stage cool-

ing, the RCB senses a signal through “Y1” & “Y2” and

de-energizes the HGR, which de-energizes SOL 3 and

SOL 2, and energizes SOL 1.

Indoor blower operation is initiated upon a call for first

stage cooling, second stage cooling or dehumidifica-

tion.

Anytime there is a call for 2 stages of cooling, the unit

will not operate in the reheat mode, even if there is still

a call for dehumidification at "HUM".

The unit will not operate in the reheat mode if there is

any call for heating.

All safety devices function as previously described.

FIGURE 18 - REHEAT CONTROL BOARD

OCC

COM

HGRR

HGR

HUM

MODE

SELECTION

JUMPER

DEHUMIDISTAT

HARNESS

CONNECTION