Glow T150 & T180
Tankless Condensing Water Heater
33
3.5 Recirculation Pump
Hot water Re-Circulation is allowed on the
Glow
tankless water heater, provided a factory verified
method is utilized. The appliance minimum flow 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 configuration.
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 flow
for this option is 1.0 gpm and the allowable external
pressure drop is 19 ft.wg. Specific 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 configuration.
The system is comprised of a pump with integral time
clock and cord set, thermal bypass valve, and four flex
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
Recirculation Pump Information
Demand initiated systems are strongly recommended,
however, due to their complexity please contact
Glow
Brand
for further information.
target system flow for this option is 1 gpm and the
allowable external pressure drop is 12 ft.wg. Specific
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).
3.6 Water Connections
In order to safeguard the heat exchanger,
especially in case of water heater replacement, it
is recommended that the system is hot-flushed to
remove any impurities (especially oil and grease) from
the pipes.
Make sure the water pipes are not used to
ground the electrical system. The pipes are unsuitable
for this purpose.
A sediment inlet water screen is supplied and
already installed in every unit. Do not allow water to
flow into the unit unless the dirt inlet water screen is
in place. Serious irreparable damage can occur and
void the warranty.
3.6.1 Pressure Relief Valve And Tee
Operation and Maintenance Instructions
Should the installer choose not to use the isolation
valve kit, then a pressure relief valve and tee must be
used. Either kit is available from the manufacturer.
Installation
The Pressure Relief Valve and Tee must be installed
in place of the optional Tankless Water Heater
Isolation Valve Kits in accordance with local code
requirements. In the event that these instructions
conflict with code requirements, the code shall take
precedence. (Figure 3.14 & 3.15)
Δ
Install the factory supplied tee onto the hot water
outlet of the water heater. The pressure relief
valve is to be fitted into the branch port of the tee.
Be sure to use Teflon tape or approved thread
sealer when fitting the assembly together. The
outlet connection of the pressure relief valve must
face down.
Δ The appropriate 3/4” adapters can be fitted to the
HOT and COLD water lines.
Δ
A pressure relief valve, complying with the
Standard for Relief Valves and Automatic Gas
Shut-Off Devices for Hot Water Supply Systems,
ANSI Z21.22/CSA 4.4, must be installed at the
HOT water outlet connection of the water heater
during installation. Local codes shall govern the
installation of any relief valve.
IMPORTANT
–
Anti scald mixing valve must
be installed and as per local codes and authorities.
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