Honeywell TH5320U
R
R
Y
C
O/B
G
Aux
Y2
Y2 - Compressor Stage 2
C - Low Voltage Common
c
L
R - Low Voltage Hot
O - Reversing Valve
To Heat Pump
Y1 - Compressor Stage 1
The Y1/Y2 Jumper must be removed
W/
NO
NC
COM
O
ut
do
o
r
O
ut
do
o
r
C
R
H/E
RLY1
D6
To Control Board
Fid 2
D4
Blower
To Control Board
O
D3
R2
R1
D7
D5
P11
W
E
Y
1
Y2
W
a
ter
J4
D1
P5
J1
J2
J3
P10
P6
D2
D
A
B
C
C3
J5
J6
Blower
Speed
P4
P3
AUX
Y2 G
Y1
O
2
2
Y2
Y1
R
A
ir
LV Circuit Board
Comfort Plus
P7
P1
P2
P8
C
P9
RP
2
AP
P
Aux.
Relay
Peak
Inputs
The W/E Jumper must be installed
Installation
3.12
Comfort Plus
AUXILIARY LOAD CONTROL
The Comfort Plus can be used to provide control signals
to other loads in the application. To do so, connect low
voltage control wires to the "COM" and "NC" or the
"COM" and "NO" positions of the low voltage terminal
block in the electrical compartment of the Comfort Plus
system. (See Figure 17.) These contacts are rated for 30
volts, 3 amps maximum.
HUMIDIFIER/ELECTRONIC FILTER INSTALLATION
The Comfort Plus is capable of being connected to a humidifier and/or an electronic air filter. If installing either
of these devices, connections to the Comfort Plus system are made to the bottom two relays on the base I/O relay
board inside the system's electrical panel. Refer to the Line Voltage Wiring Diagrams (Page A.06-A.08) for the
location of these relays.
If installing a humidifier, connect it to the "HEAT CALL" relay on the base I/O relay board. This relay closes
during a heat call.
If installing an electronic air filter, connect it to the "FAN ON" relay on the base I/O relay board. This relay closes
during a fan call. The maximum filter size if using a Steffes Return Air Plenum is 20" x 25" x 2.
Maximum external load should not
exceed 60 VA on the system's class II
transformer.
IMPORTANT
TWO STAGE HEAT PUMP APPLICATION WITH VARIABLE SPEED BLOWER
FIGURE 16
TYPICAL AUXILIARY LOAD CONTROL
FIGURE 17
NOTE:
During off-peak (charge) periods, the contact is
closed between "COM" and "NC".
IMPORTANT
* If multiple inputs are active, system will dis-
play highest Heat Call values.
** Systems built before 1/1/2011 are configured
for 50% airflow in Stage 1. For more infor
-
mation, refer to Instruction #1200601-High
Speed Stage 1 Relay Installation.
*** Thermostat must be programmed to energize
reversing valve for cooling. If outdoor unit
used requires the reversing valve be ener-
gized for heating, see Configuration Menu
on pages 3.13-3.14.
Thermostat
Stage
Thermostat
Output
Heat
Pump
Stage
% of
Selected
CFM
Heat Call
Status on
Digital Display*
Discharge Air
Temperature
Target
1
Y1/G
1
50% or 70%**
HC1
L048
2
Y1/Y2/G
2
100%
HC1
L048
3
Aux/Y1/Y2/G
2
100%
HC2
L049
Fan
G
0
400 cfm
HCF
N/A
Cool 1
Y1/G/O
1
50% or 70%**
COOL
N/A
Cool 2
Y1/Y2/G/O
2
100%
COOL
N/A
Emergency
H/E
0
100%
HC3
L049
Contractor Use Only
TWO STAGE HEAT PUMP
***
W/
NO
NC
C
O
M
O
ut
d
oor
O
ut
d
oor
C
R
H/E
A
Blower
Air
Water
C
D
B
To Control Board
C
R
Speed
Blower
Y1-Y2
W-E
Y2
Y1
AUX
O
G
RP
2
2
Y1 Y2
2
O
AP
P
Inputs
Peak
Aux.
Relay
Auxiliary Control Relay
Relay Contacts
Relay Coil
COM
NO/NC
COM
NO/NC
