20
TABLE 5
System Low Voltage Wiring
Diagrams
NOTE: Local codes may require
thermostat wiring to be routed through
conduit or raceways. In such instances
splices can be made inside the Hydronic
Air Handler. All wiring must be NEC Class
I and must be separated from incoming
power leads.
Provide field-supplied disconnect for
maximum fuse or circuit breaker sizes, as
required by code.
Transformer is factory wired for 115V
operation.
The secondary circuit of the transformer
is protected by a 3-amp fuse mounted on
the printed circuit board.
FIGURE 14
HYDRONIC AIR-HANDLER CONTROL BOARD
FLOW SENSOR
CONNECTIONS
SW1 SET-UP SWITCH
AND HEATING BLOW
OFF DELAY
24 V THERMOSTAT
TERMINALS
TRANSFORMER 24 V
CONNECTIONS
P3
P4
P1
3 AMP FUSE
OPERATING MODE
JUMPER (SHUNT)
STATUS LED LIGHT
115 VAC (L2)
NEUTRAL
CONNECTIONS
PUMP
CONNECTIONS
115 VAC (L1) LINE
VOLTAGE
CONNECTION
FAN
PARK
FAN
CONNECTION
HEATING
FAN
CONNECTION
COOLING
HUMIDIFIER CONNECTIONS
(DRY CONTACT) 24 VAC OR
115 VAC
FLASH UPGRADE
CONNECTION
(FACTORY ONLY)
u
1
A
N
1
P7
B
G
W
Y2
Y1
R
C
NOTES:
1. For proper operation of an open loop system (refer to Figures 11 and 17), the jumper (shunt) position on PCB point “P7” should be in
the FS position.
2. When changing shunt position ensure that unit power is turned off.
Wire Gauge
Maximum Distance (feet)
18 gauge
60
16 gauge
100
14 gauge
160
12 gauge
250
Dip Switch Options:
Refer to the appropriate diagram for the
proper dip switch setting to be used with
the designed application (Figure 17).
THERMOSTAT INSTALLATION:
Thermostat should be mounted:
• approximately 5 ft. (1.5 m) from floor
• close to or in a frequently used
room, preferably on an inside,
partitioning wall
• on a section of wall without pipes
or duct work.
Thermostat should NOT be mounted:
• close to a window, on an outside
wall, or next to a door leading to
the outside.