GLOW T180 - 3.5 Recirculation Pump

Glow T180
Tankless Condensing Water Heater
32
3.5 Recirculation Pump
Hot water Re-Circulation is allowed on the
Glow T180 tankless water heater, provided a factory
veried method is utilized. The appliance minimum
ow for operation is 0.6 gpm (2.27 lpm).
Dedicated Hot Water Return Line
Option 1
Pump part # 140-003
Aquastat part # GLO-180-80
Connection Kit part# 96806141 (1/2”) or,
Connection Kit part# 96806143 (3/4”)
See Figure 3.7 & 3.10 for system conguration.
This system is comprised of a circulating pump,
connection kit with integral check valve, and
aquastat. This aquastat must be secured to the
dedicated return line as indicated. The pump will
operate once the supply line temperature is below
105 °F. Once the supply line reaches 115°F the
pump will shut off. It is not recommended to operate
the pump constantly without the aquastat connected.
Doing so will alter the appliance warranty period
(as per Glow Brand standard published warranty).
The target system ow for this option is 1.0 gpm
and the allowable external pressure drop is 19 ft.wg.
Specic job head calculation is the responsibility
of the designer or installer. The maximum water
temperature allowed is 230 °F.
(See Figure 8.7 on page 74)
Cold Water Return Line
Option 2
Pump part # 140-103
Connection kit part # 529913 (1/2”) or,
Connection kit part # 529911 (3/4”)
Bypass Valve part # GLO-103-01
Flex Hose kit part # GLO -103-03 (3/8”x1/2”) 2 hoses
per kit
See Figure 3.6 & 3.9 for system conguration.
The system is comprised of a pump with integral
time clock and cord set, thermal bypass valve, and
four ex connection hoses. It is not recommended
to operate the pump constantly without the time
clock functioning. Run time should not exceed 8 hrs
per 24 hr cycle. Doing so will alter the appliance
warranty period (as per Glow Brand standard
published warranty). The target system ow for this
option is 1 gpm and the allowable external pressure
drop is 12 ft.wg. Specic job head calculation is
the responsibility of the designer or installer. The
maximum water temperature allowed is 230 °F.
(See Figure 8.7 on page 74)
Recirculation Pump Information
Demand initiated systems are strongly
recommended, however, due to their complexity
please contact Glow Brand for further information.