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8. THERMISTOR INSTALLATION
8.1
SP SERIES THERMISTOR INSTALLATION
All SP series heaters are supplied with a remote thermistor assembly. The thermistor must be installed in the supply
air duct, between 1m to 3m away from the heater, but never beyond the first Branch Take Off (BTO) fitting.
Note: Where an Add-On air conditioning indoor evaporator coil is installed, the thermistor must be located in the discharge air pop
of the indoor coil.
These installation practices promote more accurate supply air temperature control and optimise heater performance.
•
Ensure that there is at least 1 metre of appropriately sized ducting installed between the heater and the first
BTO fitting (or evaporator coil).
•
Drill a 20mm diameter hole through the top of the inlet end of the first BTO fitting (refer to Diagram 20) or
through the top of the evaporator coil discharge pop.
•
Carefully insert the thermistor assembly (probe end first) into this hole and secure using the self drilling screw
provided. Seal any remaining openings with duct tape.
•
Ensure that the thermistor lead is secured to timbers or duct outer casing to prevent damage.
If the first BTO fitting is installed more than 3m away from the heater, an additional duct joiner (installer supplied) will
be required so that the thermistor assembly can be fitted correctly. Install the joiner between 1m and 3m away from
the heater, ensuring the thermistor can reach this joint. After making this modification, follow the steps per normal
practice.
Diagram 20. Duct Joiner Location
8.2
BX5 THERMISTOR INSTALLATION
The thermistor is located on a bracket within the heat exchanger tubes and must be positioned correctly prior to the
installing unit onto a base box. Install a thermistor as follows:
a. Remove all packaging from the heater and basebox where applicable.
b. Remove the thermistor bracket secured to the heat exchanger
c. Position the thermistor bracket on the discharge pop lip and secure the arm with supplied mounting screw
(located in plastic bag containing the manuals). See "Diagram 21. Thermistor Mounting Location" on page 31
d. Position heater onto basebox and coil up excess loom into the corner of the basebox. Ensure thermistor loom is
not pinched between heater and basebox.
Rinnai
SUPPLY AIR DUCT
THERMISTOR
UNIVERSAL MODEL
INTERNAL MODEL
1.0m to 3.0m
SUPPLY AIR DUCT
30
Ducted Gas Heater IM
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