Typical Radiant Floor To Water Heater Installation; Typical Snow Melt Installation; X-Pump Block - Taco SR501 Wiring Manual

Domestic
Hot
Supply
C
MIX
H
ASSE 1017
Tempering
Valve
Hot
Cold
WATER
HEATER
Separator
(Tb)
Exp.
Tank
HEAT SOURCE
HEAT RETURN SENSOR
(OPTIONAL)
SOURCE
Tb = Boiler Supply Temperature
Ts = System Supply Temperature
ΔTs = System Temperature Drop
(typically 20°F for convectors
and 10°F for radiant floor heating)

Typical Radiant Floor to Water Heater Installation

Cold
Supply
Check
Valve
WARNING! A pressure relief valve and expansion tank must be installed on the secondary
side in addition to any pressure relief valve and expansion tank which is installed on primary
side of system. Use dedicated supply and return piping to the X-Pump Block from the water
heater so as not to add heated water into the house's cold water piping.

Typical Snow Melt Installation

Note 1 Note 2
{
{
FIXED SPEED
CIRCULATOR
(4 PIN PLUG)
Note 1: There must be no more than 4 pipe diameters between the tees in the boiler and
system loops in order to prevent ghost flow when the variable speed injection
pump is off and either the boiler pump or system pump is on.
Note 2: There must be at least 6 pipe diameters of straight pipe on either side of the tees in
order to prevent the momentum of water in the boiler and system loops from pushing
flow through the injection loop.
Note 3: There should be a minimum 1 foot drop to create a thermal trap in order to prevent
convective heat transfer through the injection loop.
X-PUMP
BLOCK
Air
Separator
Exp.
Tank
SYSTEM
RETURN
SENSOR
X-PUMP
BLOCK
{
}
(Ts)
VARIABLE SPEED
CIRCULATOR
(3 PIN PLUG)
Relief
Valve
Return
(Secondary Side
Supply
Air
Relief
Separator
Valve
Return
Exp.
Tank
( Δ Ts)
SYSTEM
SUPPLY
SENSOR
Supply
RADIANT
SYSTEM
of the System)
SNOW MELT
SYSTEM
61