Rinnai
9
Ducted Gas Heater OM
2. Outlet Guide
The outlet register chart (Table 1) provides recommendations based on using the Sizing Guide or a system designed
using accepted design principles. These figures also relate to typical size registers and diffusers used on domestic
heating systems i.e. 300 mm x 100 mm floor registers and 150 mm round ceiling diffusers, with 150 mm ductwork
connection.
For all systems, a minimum number of outlets (Column B and C) must remain fully open (this includes both the
outlet grille and the damper in the duct) to achieve optimum turn down performance and system reliability without
overheating. Similarly, ceiling outlet systems have a maximum number of outlets that can remain fully open, to
ensure that the velocity through each outlet is sufficient. These maximum ceiling outlet figures relate to fully open
outlets, however, the system will operate efficiently with more outlets open, if it has been properly balanced.
The outlet chart is divided into four columns as follows:
A.
The maximum number of outlets that should remain fully open for a ceiling outlet system.
B.
The minimum number of outlets that should remain fully open for floor/ceiling systems where the system does
not have zone dampers installed or, where there are zone dampers but these zones are not operated from a
networker thermostat (e.g. wall switches).
C.
(Adaptive Zoning Only) The minimum number of outlets that should be fully open for floor/ceiling systems with:
• zone dampers installed,
• zone control via a networker thermostat using on-board zone relays or a Network 516 module, and
• adaptive zoning active (hence minimum outlet number is reduced).
Note:
• Refer to Column C only when the networker has been configured for adaptive zoning. Otherwise, refer to Column B.
• For ZonePlus configurations, refer to the ZonePlus Installation Manual.
• Airflow figures are based on a total static pressure of 125Pa for 30 and 35 models and 50Pa for other models.
