Specifications
Legacy™ Model LRZM Pool/Spa Heater
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Installation and Operation Manual
Do not use any pipe compound or pipe dope on
the threads of the adapter or any part that comes in
contact with the plastic headers. These compounds
may damage the header over a period of time.
In order to prevent property damage, do not over-
tighten. Overtightening may crack the header.
DO NOT TIGHTEN WITH A WRENCH.
Overtightening may crack the header. Route the
discharge piping so that discharge from the pipe does
not endanger anyone near the heater.
Be sure to check any applicable installation codes
in your area to determine whether a pressure relief
valve is required. See Section 12.2 (Parts List) of this
manual for the appropriate kit part number.
The pressure rating of the valve should be at or
below the lowest working pressure of any component
in the system. The maximum working pressure of this
heater is 5.1 bar.
Follow these steps to install a pressure relief valve:
1. To protect the threads while drilling, screw the
brass adapter (included with the Zodiac PRV
kit) into the blind threaded hole on the top of the
inlet/outlet header.
2. Using the countersink in the center of the blind
hole as a guide, drill a 6.4 mm (1/4 inch) hole
through the plastic (see Figure 13).
3. Open the hole by reaming it with a 9.5 mm (3/8
inch) drill bit.
4. Open the hole again by reaming it with a 12.7
mm (1/2 inch) drill bit.
Initially drilling a 12.7 mm (1/2 inch) hole without
reaming may cause the bit to "grab" on the plas-
tic. This may cause personal injury or damage the
plastic header.
5. Remove the brass adapter and clean the cuttings
out of the hole.
6. Install the rubber washer at the bottom of the
hole (see Figure 14).
7. Thread the adapter into the hole and tighten so
that it seals against the rubber washer.
8. With a permanent marker, place a mark on the
adapter so that the mark faces the same direction
as the water connections on the header.
9. Remove the adapter from the hole.
10. Coat the threads of the pressure relief valve
(PRV) with an appropriate metal to metal thread
sealant.
11. Install the adapter on the PRV and tighten using
two (2) wrenches. Use the mark made earlier on
the adapter to orient the PRV to the desired direc-
tion in relation to the water connections on the
header.
12. Reinstall the adapter, with the PRV, into the
plastic threaded hole and tighten it until the mark
on the adapter is once again facing the same
direction as the water connections on the header.
TEMPORARILY INSTALL
BRASS ADAPTER TO
PROTECT PLASTIC
THREADS
START WITH A 1/4" BIT
THEN OPEN HOLE WITH
A 3/8" BIT THEN OPEN
HOLE WITH A 1/2" BIT
RUBBER WASHER
BRASS ADAPTER
PRESSURE RELIEF
VALVE HAND
TIGHTEN ONLY