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24F590 (120V) and 24F591 (240V) Merkur Heated Circulation Kit
10 3A1203B
Installation
NOTE: See your separate heater manual, supplied, for
heater installation and electrical requirements.
NOTE: Apply pipe sealant (19) to all non-swiveling
threads.
NOTE: On pumps with a 3/4 npt fluid inlet, use bushing
(12) to allow connection of the swivel adapter (13).
1. See F
IG. 3. Assemble the bushing (12, if needed)
and swivel adapter (13) to the pump inlet. Attach the
suction hose kit (16) to the adapter.
2. Screw one branch of the 3-way valve (14) into the
1/4 npt port of the adapter (13). Attach the drain
hose (15) to the opposite branch of the valve.
3. Assemble the knob (20), reducer nipple (9), bushing
(6), and the male end of the swivel (8) to the back
pressure valve (5). Screw the swivel (8) onto the
middle threads of the 3-way valve.
4. Screw the 90° swivel (3) onto the heater (4) fluid
inlet.
5. Attach the heater hose (25) as follows:
a. On pumps with a 3/8 npt fluid outlet, screw the
female end of the swivel (17) onto the pump out-
let fitting. Connect the heater hose (25) between
the swivel (17) and the 90° swivel (3) at the
heater inlet. The bushing (18) is not needed.
b. On pumps with a 3/4 npt fluid outlet, screw the
female end of the bushing (18) onto the pump
outlet fitting. Connect the heater hose (25)
between the bushing (18) and the 90° swivel (3)
at the heater inlet. The swivel (17) is not
needed.
c. On pumps with a 1/2 npt fluid outlet, connect the
heater hose (25) between the pump fluid outlet
and the 90° swivel (3) at the heater inlet. The
swivel (17) and bushing (18) are not needed.
6. Screw the nipple (21) into the heater (4) fluid outlet.
Screw the fluid filter kit (22) inlet swivel onto the nip-
ple.
7. Ground the pump as explained in your separate
pump manual.
8. Connect the fluid supply line to the fitting at the fluid
filter outlet.
9. Connect the fluid return line (R) to the reducer nip-
ple (9) at the inlet of the back pressure valve (5).
Use the back pressure valve to adjust fluid pressure
in the circulation system.
10. Use the 3-way valve (14) to direct circulating fluid
back to the pump through the adapter (13), or to a
container through the drain hose (15).
11. See your separate pump and heater manuals for
operation, maintenance, repair, and parts informa-
tion.