John Wood Noritz Condensing - N-0841MC - Manuel (Page 33)

33
G
(1 1/4"-2")
Unit 6
Unit 2
Unit 1
System Controller
Storage tank supply line
(1 1/4"-2")
Storage tank return line (Copper or Stainless Pipe) (Copper or Stainless Pipe)
Storage Tank Circulation Pump 1 Storage Tank Circulation Pump 2
(if Necessary)
Gas Pipe
Hot Water
Storage Tank
Relief Valve
Hot water supply line (Copper or Stainless Pipe)
Return line circulation pump
Hot water return line (Copper or Stainless Pipe)
Cold Water Supply
* Size the water supply piping to allow for maximum flow rates of the building.
* Set dipswitch 3 to OFF. (See SC-201-6M Installation Manual)
* If the tank thermostat will control the pump set dipswitch 2 to OFF. (See SC-201-6M Installation Manual) Do not connect more than one pump to the tank thermostat.
Hot Water Supply
Remote Controller
Option 2-Unit Control
Option 1-Tank Thermostat Control When installing 2 pumps in parallel The system controller will stop the units from heating when the tank is up to temperature, and the unit will cut the flow through it to 9.8 L/min. (2.6 GPM). Install the plumbing so that a change in flow will not damage the pump.
Thermostat
System select connector
Connect to the “Sto- rage system” connector"
Pump Control Wires (use external relay) * Also
disconnect this
connector on units 2-6
Disconnect this Connector
B-2. Example of Installation with a Storage Tank and Recirculation System
The pump will push water through the Multi-System to heat up the tank.
When the return temperature is high, the flow within the device will be limited to 9.8 L/min. (2.6 GPM)*.
*
For the set temperature of the remote control, use the temperature (of the thermostat) + about 6
°C (10
°F).
*
To achieve the highest recovery, size the storage tank circulation pump for maximum capacity. ( 34 L/min. (9 GPM) (each) @ 120kPa (40 ft.) of head (71
°C (160
°F) setting or less) + piping losses through the system).
Verify the supply pressure to the units is at least 30 PSI.