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Installation Section
PLUMBING CONNECTIONS
The MiniMax 100 heater has the unique capability of
direct schedule 40 or 80 CPVC/ABS/PVC plumbing
connections. Either a Quick-Flange or Quick-Flange II
(depending on model ordered) has been included with the
MiniMax 100 to insure conformity with PacFab's
recommended CPVC/ABS plumbing procedure; see
Figure 10. Other plumbing connections can be used. The
instructions on the following pages show the methods for
successfully connecting plumbing to the inlet/outlet header
with either the Quick-Flange or Quick-Flange II.
Figure 10.
MANUAL BY-PASS
Where the flow rate exceeds the maximum 80 GPM, a
manual by-pass should be installed and adjusted. After
adjustments are made, the valve handle should be
removed to avoid tampering.
Model
100
* Do not exceed the maximum recommended
flow rate for the connecting piping.
VALVES
When any equipment is located below the surface of
the pool or spa, valves should be placed in the
circulation piping system to isolate the equipment from
the pool or spa.
Check valves are recommended to prevent back
siphon; see Figure 11.
Caution: Exercise care when installing chemical
feeders so as to not allow back siphoning of
chemicals into the heater, filters or pump.
P/N 471438
Min.
Max.*
20
80
PRESSURE SWITCH
The pressure switch will keep the circuit open when the
pump is not on and operating. When the filter pump
turns on, the pressure switch closes the circuit and the
heater will operate. When the heater is installed below
water level of a spa or pool, adjustment of the pressure
switch may be required. For adjustment of pressure
switch, we recommend the following procedures.
1. Backwash the filter and clean the pump hair and
lint basket before making any adjustment to the
pressure switch.
2. Switch the circulation pump on and make sure it
is primed.
3. Push the heater power switch on and set the
thermostats to their highest temperature settings.
4. Clean the locktight off of the pressure switch
adjustment knob threads.
5. Turn the adjustment knob clockwise or away
from the micro-switch, until the heater shuts
down; see Figure 12.
6. Turn the adjustment knob counter-clockwise 1/2
turn and the heater should refire.
7. Turn the pump off
and the heater
should shut down.
If the heater does
not shut down,
repeat the proce-
dure.
8. Switch the pump
off and on several
times to assure proper adjustment.
NOTE
If the pool is more than one floor above or one floor
below, the pressure switch may have to be
replaced with a flow switch.
Figure 11.
FILTER
GATE VALVE
GATE VALVE
PUMP
Adjustment
Knob
Figure 12.
TO POOL
HEATER
MiniMax 100
ON
COLD
HOT
OFF
POOL TEMP
High Performance Heater
PacFab
CHECK
VALVE
FROM POOL
Rev. A 2-4-2000
13
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