Rinnai 37AHA04508KA5 Installation, Operation And Maintenance Manual page 16

Installation
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 l and must be
separated from incoming power leads.
Provide field supplied disconnect. Refer to Table 3
(Specifications) for maximum fuse or circuit breaker
sizes.
Transformer is factory wired for 115v operation. (See
Figures 25 through 27 .)
The secondary circuit of the transformer is protected
by a 3-amp fuse mounted on the printed-circuit board.
FLOW SENSOR
CONNECTIONS
P3
P4
24 V THERMOSTAT
TERMINALS
TRANSFORMER 24 V
CONNECTIONS
Figure 14:
Air Handler Control Board
Notes:
1. For proper operation of an open loop system (refer to Figures 11 and 14), 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.
16
SW1 SET-UP SWITCH
AND HEATING BLOW
OFF DELAY
FLASH UPGRADE
CONNECTION
(FACTORY ONLY)
STATUS LED LIGHT
OPERATING MODE
JUMPER (SHUNT)
P1
3 AMP FUSE HUMIDIFIER CONNECTIONS
(DRY CONTACT) 24 VAC OR
115 VAC
Rinnai Corporation Hydronic Air Handler Manual
IMPORTANT: Where possible, use a Rinnai factory
authorized thermostat with the 37AHA series hydronic
Air Handlers. If a thermostat other than specified is
used then refer to the manufacturer's installation
instructions.
Wire Gauge
20 gauge
18 gauge
16 gauge
14 gauge
12 gauge
115 VAC (L2)
NEUTRAL
CONNECTIONS
FAN
CONNECTION
COOLING
Maximum Distance (feet)
45
60
100
160
250
PUMP
CONNECTIONS
115 VAC (L1) LINE
VOLTAGE
CONNECTION
FAN
PARK
FAN
CONNECTION
HEATING