Steffes 5140 Simplified Installation Guide - Manual (Page 4)

PRIMARY LOOP
(* Steffes recommends a Grundfos UP15-42F or equal single
speed 115VAC pump for the primary pump.)
The Comfort Plus Hydronic heating system MUST be plumbed with a primary loop and secondary (zone) loops. The primary loop
needs to consist of a minimum of 10' of 1" pipe and requires its own pump* (circulator). The secondary (zone) loops require
additional pump(s) to operate effectively.
PLUMBING
10
FREEZE PROTECTION: Risk of property damage. Hydronic heating system freeze-ups WILL cause extensive
damage to the entire heating system and/or property. It is the responsibility of the installer to provide protec-
tion against freezing.
PIPING SUPPORT: Risk of equipment damage or personal injury. DO NOT use the exchanger as support for
piping. Support of primary loop and associated plumbing must be installed to ensure proper operation of the
system and to keep pressure off the inlet and outlet piping.
NOTE: The primary loop pump MUST be con-
trolled by the furnace through the red
and white wires. When this pump is
running, water must be allowed to flow
through the heat exchanger.
STATIC PRESSURE
(Feet Water Column)
Based on 80 degree entry
water temperature with
a 50% glycol mix.
.1 ft @ 2 GPM
.2 ft @ 4 GPM
.4 ft @ 6 GPM
.7 ft @ 8 GPM
1.1 ft @ 10 GPM
PRESSURE DROP THROUGH
HEAT EXCHANGER
Expansion
Tank
Air Separator
Primary Loop Pump
Control Wiring
(White & Red)
Junction Box
(Factory Supplied)
*Primary
Loop
Pump
Air Vent
Piping MUST
Be Supported
Pressure
Relief Valve
(Factory Supplied)
Optional
Temperature and
Pressure Relief Valve
(Consult Local Code)
Zone
Connection
Area
Inlet
Outlet
See Note
SINGLE TEMPERATURE ZONES
White
Red
White
Red
Primary
Loop Pump
Comfort Plus
Hydronic
Exchanger
This Valve Must
Be Open During
Normal Operation
WARNING WARNING WARNING WARNING WARNING
Secondary Loop Primary Loop
Capacity 1.2 Gallons
Maximum Flow 10 GPM
Tubing Material Copper
Maximum Outlet
Water Set Temperature
180°F
HEAT EXCHANGER SPECIFICATION