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PLUMBING FOR WATER CONNECTIONS
LOCATION
The VERSA heater requires water flow and posi-
tive pressure to fire and operate properly. It must
therefore be installed downstream of the discharge
side of the filter pump. A typical installation is plumbed
as follows:
1. The inlet side of the filter is plumbed directly
to the discharge side of the filter pump:
2. The outlet side of the filter is then plumbed
to the inlet of the heater; and
3. The outlet of the heater is plumbed to the
return line to the spa. The pump, filter and
heater are thus plumbed in series.
Plumbing from the heater back to the spa must not
have any valves or restriction that could prevent flow
when the pump is operating. To do so will void the
warranty.
Heater must be located so that any water leaks will
not damage the structure of adjacent area. High
temperature plastic pipe (CPVC) may be connected
directly into the heater if local codes permit.
FLOW RATES
PIPE SIZE: 1 1/4"-1 1/2" MIN.GPM: 20, MAX.GPM: 60*
*When flow rates exceed 60 GPM an external auxil-
iary bypass valve is required. See External auxiliary
bypass valve section for details.
COMPANION FLANGE CONNECTIONS
The inlet/outlet header flange accepts a 1 1/2"
copper tube or 1 1/4" galvanized pipe as a slip connec-
tion directly into the manifold. The flange is also
threaded for 1 1/2" pipe thread. 1-1/2" CPVC adapters
(when available) can also be used.
DO NOT use petroleum base assembly fluids
(such as Petroleum Jelly or lubricating oil). If assembly
lube is required, use a silicone base compound, such
as Amoral, etc.
Inlet/Outlet Header
Flange Gasket
Fig.#8158.1
Header Flange
Pipe
Fig. # 8118.0
Outlet Inlet
Unitherm
Governor
CAUTION: Never install PVC directly in header flanges.
The initial connection must be made with a higher
temperature material such as CPVC or Copper. PVC
may be utilized immediately after the initial connection.
AUTOMATIC CHLORINATORS AND CHEMICAL
FEEDERS
All chemicals must be introduced and completely
diluted into the pool or spa water before being circulated
through the heater. Do not place chlorine tablets or
bromine sticks in the skimmer. High chemical concen-
trations will result when the pump is not running (i.e.
overnight).
Chlorinators must feed downstream of the heater
and have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off.
NOTE: High chemical concentration from feeders and
chlorinators that are out of adjustment will cause very
rapid corrosion to the heat exchanger in the heaters.
Such damage is not covered under the warranty.
UNITHERM GOVERNOR OPERATION
The patented Unitherm Governor is a thermostatic
mixing valve specifically designed to maintain constant
heater internal temperature between 105° - 115°F de-
spite continually changing flow rates from the filter and
changing pool temperatures. This narrow range is
needed to prevent damaging condensation on the burn-
ers which will occur if the heater runs for any length of
time below 100°F. It is also needed to inhibit scale
formation in the tubes by maintaining temperatures well
below accelerated scaling temperatures.