Filter
Top Products
8
the controller will turn the circulating pump on. When
the temperature difference has been reduced to eight
degrees, the controller automatically turns the pump
off.
Both single and double tank Rheem systems are
designed to provide three separate modes of system
operation. The system will, (1) accommodate 100%
solar operation, (2) serve as a preheater to your solar
storage tank or back-up water heater, or (3) bypass the
solar collector and run 100% on utility power. Section
Six provides instructions for setting the system for
automatic operation in each of these three modes.
The Dowfrost HD HTF protects your Rheem solar
system against freezing. Dowfrost HD can provide
reliable freeze protection at temperatures as low
as minus 30° Fahrenheit if properly applied and
maintained. Use of uninhibited propylene glycol,
plain water or a concentration of these two uids as
the HTF in this system is strictly prohibited.
Propylene glycol can degrade over time. The process
of degradation is accelerated in presence of oxygen
and/or heat. We strongly encourage you to establish
a preventative maintenance schedule with your
installation contractor. The HTF pH level must be
maintained between 8 and 10 in order to prevent
glycol oxidation and corrosion of the collector piping.
Rheem’s collector warranty specically excludes
freeze damage for any reason and absorber plate
damage resulting from the oxidation of the propylene
glycol HTF.
ferred to the HTF circulating through the solar
collector. The system pump efficiently circulates
this heated fluid through the collector piping and
integral tank heat exchanger. The heat exchang-
er consists of a 120’ length of copper tubing
wrapped around the solar storage tank. As the
HTF passes through the heat exchanger the heat
in the fluid is transferred by conduction to the
potable water in your solar storage tank. As this
process is continuously repeated during the aver-
age sunny day the temperature in your solar stor-
age tank rises.
The circulating pump in a solar water heating sys-
tem may be favorably compared with the human
heart. To continue the analogy, the differential
thermostat, or controller, is the brain in the sys-
tem. The controller uses 10K ohm thermistors, or
sensors, to constantly monitor the temperature
difference between the hottest and coldest
points in the system and to automatically turn
the circulating pump on and off throughout the
day.
When the solar collector absorber plate is
approximately twelve degrees hotter than the
temperature in the bottom of your solar storage
tank, the controller will turn the circulating pump
on. When the temperature difference has been
reduced to four degrees, the controller automat-
ically turns the pump off.
Both single and double tank Solaray systems are
designed to provide three separate modes of sys-
tem operation. The system will, (1) accommo-
date 100% solar operation, (2) serve as a pre-
heater to your solar storage tank or back-up
water heater, or (3) bypass the solar collector and
run 100% on utility power. Section Six provides
P.2
fig. 1
fig.2
COLLECTOR ORIENTATION
STAGGERED MOUNT
COLLECTOR SPACING
ferred to the HTF circulating through the solar
collector. The system pump efficiently circulates
this heated fluid through the collector piping and
integral tank heat exchanger. The heat exchang-
er consists of a 120’ length of copper tubing
wrapped around the solar storage tank. As the
HTF passes through the heat exchanger the heat
in the fluid is transferred by conduction to the
potable water in your solar storage tank. As this
process is continuously repeated during the aver-
age sunny day the temperature in your solar stor-
age tank rises.
The circulating pump in a solar water heating sys-
tem may be favorably compared with the human
heart. To continue the analogy, the differential
thermostat, or controller, is the brain in the sys-
tem. The controller uses 10K ohm thermistors, or
sensors, to constantly monitor the temperature
difference between the hottest and coldest
points in the system and to automatically turn
the circulating pump on and off throughout the
day.
When the solar collector absorber plate is
approximately twelve degrees hotter than the
temperature in the bottom of your solar storage
tank, the controller will turn the circulating pump
on. When the temperature difference has been
reduced to four degrees, the controller automat-
ically turns the pump off.
Both single and double tank Solaray systems are
designed to provide three separate modes of sys-
tem operation. The system will, (1) accommo-
date 100% solar operation, (2) serve as a pre-
heater to your solar storage tank or back-up
water heater, or (3) bypass the solar collector and
run 100% on utility power. Section Six provides
P.2
fig. 1
fig.2
COLLECTOR ORIENTATION
STAGGERED MOUNT
COLLECTOR SPACING