16
N. CONNECTION OF MULTIPLE COLLECTORS
The maximum number of collectors that can be connected in series is 8. If the entire installation requires
more than 8 collectors, use parallel strings of an even number. If even numbers cannot be achieved on
parallel strings, flow balancing valves must be installed to ensure each collector has the same flow.
In drain back systems, supply and return connections to the collector must use eccentric fittings or a
fitting arrangement that allows full draining of header pipes. The collector or array can be mounted level
or with up to ¼” pitch towards the return port to facilitate the drain back process. In addition, Collector
plumbing should slope toward the drain back reservoir at ¼” per foot minimum to facilitate the drain back
process. If continual slope is not achievable, consider a pressurized closed loop system.
O. POTABLE WATER
If the system is open loop direct flow, meaning that potable water is flowing through the collector, any
components used in the system must meet potable water requirements.
P. MOUNTING FRAME
Three mounting choices are available for HTP solar collectors: Tilt mounts, flush mounts, or rack mounts
(see Part 4). Feet are supplied to fasten the panel securely to the roof. It is important that frame
attachment points and externally supplied fasteners are of suitable structural strength and corrosion
resistance. Be sure to tighten all hardware securely.
Q. GALVANIC REACTION
Zinc galvanized components should NOT be installed in direct contact with stainless steel or aluminum,
as galvanic reaction between metals can cause premature oxidation of the zinc coating, as well as the
steel and aluminum underneath.
Avoid using galvanized steel bolts. Use stainless steel components instead. If galvanized components
ARE used, avoid direct contact between two metals by using rubber/plastic separators.
If roof surface is galvanized steel, refer to manufacturer’s corrugated roof installation guidelines.
PART 4 – MOUNTING INSTALLATION
A. MOUNT TYPES
HTP offers three types of mounting assemblies:
1. TILT MOUNT (HTP Part # FP-SM)
Tilt mounts are most commonly used on flat roofs. These mounts can be adjusted to any angle to
maximize collector efficiency. HTP’s tilt mounts consist of 4 hinged triangle feet that, when combined with
a rear strut (Part # FP-ST), can create a panel tilt or inclination of up to 60
o
. The rear strut determines the
degree of tilt, and can be cut to the appropriate size.
2. FLUSH MOUNT (HTP Part # FP-FM)
Often called direct mounts, flush mounts are often used on a sloped roof that is within 15
o
of latitude.
Flush mount feet raise the collector 3” from the mounting surface. If roof pitch is insufficient, a tilt mount
may be necessary.
Summary of Contents for FP-26SC
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