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The outlet chart (Table 8 on page 26) provides recommendations based on using the Product 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. 300mm x 100mm floor registers and 150mm round ceiling diffusers, with 150mm
ductwork connection. For all systems, a minimum number of outlets must remain fully open (this includes both the outlet
grille and the damper in the duct) if the heater is to operate properly 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. There is no maximum number for floor outlets, so the following
chart below lists the typical number of floor outlets for each heater model.
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 typical number of outlets for a floor outlet system.
C. 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).
D. The minimum number of outlets that should be fully open for floor/ceiling systems where the system has zone
dampers installed, and these zones are being operated from a Networker Thermostat using the heater's on-board
zone relays or a Network 516 module. Systems fitting this description are deemed to have Adaptive Zoning
active, hence minimum outlet numbers are reduced. Where it shows half figures such as 1.5, it is possible to
operate with 1 outlet fully open, and another outlet half closed (such as a bathroom). Refer to Section 12 for
balancing guidelines.
Note: Column D should not be used unless the Networker has been configured for Adaptive Zoning only. If not refer to column C
instead. For a ZonePlus configuration please refer to the ZonePlus Installation Manual.
Note: For SP5 & SP6 Internal models, the normal return air pop configuration is side entry, but can be changed to the end of the fan
cabinet if necessary. If this is done, a total of two outlets must be removed from the allowable maximum number of outlets.
10.1 RETURN AIR POP CONFIGURATION CHANGES
Some heater models offer an alternative for the return air pop from the side position to the end of the cabinet (for
example, to accommodate a lay-down kit). Connecting the return air pop to the end of the unit reduces the rated air
flow by up to 30%.
RETURN AIR CONNECTION AT THE END OF THE UNIT (REAR ENTRY)
IMPORTANT:
On applicable models, connecting the Return Air duct to the end of the unit (rear entry) will result in reduced air flow by up to 30% – for
example, when using a Lay Down Kit. In this situation:
Connecting the return air duct to the end of the unit reduces the rated airflow by up to 30%.
The total number of outlets normally permitted for a heating system shall be reduced by 2 (refer to the outlet register chart located on
Table 8 on page 26).
•
DO NOT USE this configuration in Add-On Cooling applications, unless you ensure Minimum Recommended Airflow required for
the cooling is maintained.
Brivis
10. OUTLET GUIDE
25
Ducted Gas Heater IM
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