036-21539-003-B-0305
Unitary Products Group
17
"ALTERNATE” MODE
When the RCB detects a need for dehumidification
(24VAC) at "HUM" via the field supplied dehumidistat
connected to RHTB-1 and RHTB-2, and there is not a
call for cooling, it energizes the HGR, which energizes
the SOL 3, SOL 2, and de-energizes SOL 1. The unit
then operates with circuit #1 in reheat mode and circuit
#2 in cooling mode.
When the room thermostat calls for first stage cooling
while there is still a call for dehumidification, no opera-
tional change is made. The call for cooling is ignored
and the unit continues to operate with circuit #1 in
reheat mode and circuit #2 in cooling 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. Both circuits operate in
the cooling mode.
Indoor blower operation is initiated upon a call for first
stage cooling, second stage cooling or dehumidification.
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 2 - REHEAT CONTROL BOARD
R
Y1
Y2
G
W1
OCC
C
W2
P4
P5
P6
P3
COM
HGRR
HGR
HUM
K1
K2
K4
K3
`
MODE
SELECTION
JUMPER
DEHUMIDISTAT
HARNESS
CONNECTION