GLOW T180 - Page 24

Glow T180
Tankless Condensing Water Heater
24
Figure 3.4 Inlet Screen
Water Quality Chart
3.4.2 Thermal Expansion Device
If this water heater is installed in a closed water supply
system, such as one having a back-ow preventer
in the cold water supply, provisions must be made
to control thermal expansion. DO NOT operate this
water heater in a closed system without provisions for
controlling thermal expansion.
3.4.3 Inlet Screen
This unit comes complete
with a water inlet screen
which is factory installed in
the cold water inlet tting.
Do not operate this unit
without the inlet screen in
place. Doing so can and
will cause serious damage
to the unit and will void the
warranty. Should there be
reduced water ow than what
is expected, the water inlet
screen may be dirty and needs
to be removed, cleaned or
replaced. (see g. 3.4)
3.4.4 Water Supply Conditions
CAUTION: IMPORTANT – Do not apply heat to
the HOT and COLD water connections. If connections
are used, solder tubing to the adapter before tting the
adapter to the water connection on the water heater.
Any heat applied to the water supply ttings will
permanently damage the internal components of the
water the water.
Plumbing should be carried out by a qualied
plumbing professional in accordance with local codes.
Only use approved plumbing materials.
To conserve energy and to prevent freezing, insulate
both HOT and COLD water supply lines. Do not
insulate the drain line or pressure relief valve.
IMPORTANT – Anti scald mixing valve
must be installed and as per local codes and
authorities.
The water supply pressure at the inlet to the
water heater must be between 30 psi (2.15
bar) and 85 psi (6 bar).
In areas with higher water inlet pressure a
pressure reducing valve must be installed
before the water heater.
Cleaning the heat exchanger coil annually is
recommended. More frequent heat exchanger coil
cleaning is required based on the hardness of the
main water supply and the presence of residual solids
or impurities which are often present in the case of
a new installation. If the characteristics of the water
supply are such that require it to be treated, then an
appropriate treatment devices must be installed.
3.4.1 Water Supply Quality
CAUTION: This water heater MUST
ONLY be used with the following water supply
conditions to prevent product damage and
operation failure.
Δ Clean, potable water free of corrosive chemicals,
sand, dirt or other contaminants.
Δ Inlet water temperatures above 0°C (32°F), but
not exceeding 49°C (120°F)
Δ DO NOT reverse the HOT and COLD water
connections
Δ DO NOT connect this water heater to water lines
previously used for space heating. All water
piping and components shall be suitable for
potable water.
Δ With recommended water quality (see table 3.1)
pH 6.5-8.5
TDS (Total Dissolved
Solids)
Up to 500 mg/L
Free Carbon Dioxide (CO2) Up to 15 mg/L
Total Hardness Up to 150 mg/L
Aluminum Up to 0.2 mg/L
Chlorides Up to 200 mg/L
Copper Up to 1.0 mg/L
Iron Up to 0.3 mg/L
Manganese Up to 0.05 mg/L
Zinc Up to 1.0 mg/L
Table 3.1