Install Instructions

37
System Controller
Remote Controller
G
(1 1/4"-2")
(3/4"-1 1/4")
Hot Water Supply
Circulation Pump 1
Circulation Pump 2 (If Necessary)
Pump Control Wires
(for pumps > 85 W, use an external relay)
When installing 2 pumps in parallel
*
Set “Yes” for the question“
Start pump rotation
?”
in system settings.
(See SC-301-6M-EXT Installation Manual)
Gas Pipe
Hot Water Return Line
*
Size the cold water supply piping to
allow for maximum flow rates of the units.
Hot Water Supply Pipe
(1 1/4"-2")
Expansion Tank
Cold Water Supply Pipe
Unit 6
Unit 2
Unit 1
B-1. Example of Recirculation with a Multi-System (Recirculation system)
Thissystemwillmakehotwatermorequicklyavailabletoremotextures.
The pump will circulate water through the loop until the entire loop is warm, and then the system
controller will turn off the pump until the loop cools down.
* Size the pump to provide at least 2 GPM @ 10 feet of head + piping losses through the system.
Checkthemaintenancemonitorsontheunittomakesurethepumpisprovidingadequateow.
•
Makesurethattheowrateisnotgreaterthan4ft./sec.
(3/4”: 5 GPM, 1 1/4”: 13 GPM)  Iftheowistoolow,therecirculationlooptemperaturewillnotbewarmenough,iftheowistoo
high, the lifetime of the unit will be reduced.
* Iftherearemultiplecirculationloops,trytomaketheowrate.75-1.25GPMineachloop. * Use copper or stainless water piping for the entire system.