Document ID: chunk:federal_register_of_legislation:F2022C00033:reg:9:p6
Version: federal_register_of_legislation:F2022C00033
Segment Type: reg
Provision Reference: reg 9 (pt 6/9)
Character Range: 37095–39849

If a pumped SWH is claimed to be a "controlled flow" system, then documentation demonstrating how the flow rate is controlled for every installation shall be provided.  The alternative product configurations that shall be detailed in the installation manual are:
         i. Flow meter in every installation
         If a flow meter is fitted in every installation with an adjusting valve that is not easily accessible by the user then provide a copy of the flow meter specification and the SWH installation manual detailing the flow setting procedure.  The pump power use shall be measured as detailed below.
         ii. Flow meter used during commissioning
         If a flow meter is fitted in every installation and the flow rate set by an adjusting valve that is not easily accessible by the user and the flow meter is removed after commissioning, then provide a copy of the flow meter specification and the SWH installation manual detailing the flow setting procedure.  The pump power use shall be measured as detailed below.
         iii. Flow rate set by controller
         If the pump flow rate is set by a controller based on a real time signal from a flow meter or the temperature rise in the collector circuit or by another real time signal, then provide a copy of the controller logical functions and provide measured flow rate and pump electrical power as detailed below.
         iv. Orifice restrictors
         If a set of orifice restrictors are used to set the flow rate for installations with different collector loop piping lengths and number of collectors then provide a copy of the installation manual detailing how the appropriate orifice is selected on the basis of the site specific piping lengths and number of solar collectors.  The pump flow rate and power use shall be measured as detailed below.
         v. Other site specific flow control method
         Provide details if applicable.
Measurement and documentation of pump flow rate and power
     For small SWHs the collector loop flow rate and pump electrical power input to be used in the method must be measured for a typical system installation as specified in Step 2.h. of the method in Division B of Part 1.
     For large SWHs the collector loop flow rate and pump electrical power input to be used in the method may be either measured or calculated for a typical system installation as specified in Step 2.g. of the method in Division B of Part 2.  These measurements or calculations shall be carried out for the specific collector array size or recirculation loops that are specified for the product.
     Measurements or calculations for products with variable flow rate shall cover the full range of operating conditions.
     A report must be prepared