12
ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
Sediment Traps
Install a sediment trap and union located outside
the heater panels in accordance with National code
requirements. Do not use a restrictive gas cock. The
sediment trap shall be either a tee fitting with a capped
nipple in the bottom outlet which can be removed for
cleaning, as shown in Figure 17, or an other device
recognized as an effective sediment trap. All gas piping
should be tested after installation in accordance with local
codes.
Gas Pressure Testing
Before operating the heater, the heater and its gas
connections must be leak tested. Do NOT use an open
flame to test for leaks. Test all gas connections for leaks
with soapy water or another non-flammable method.
The heater and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa). The heater must be isolated
from the gas supply system by closing its individual
manual shut-off valve during any pressure testing of the
gas supply at test pressures equal to or less than 1/2 psig
(3.5 kPa).
Note: Do not use threaded seal tape on gas line pipe
thread. A pipe compound rated for use with natural and
propane gases is recommended. Apply sparingly only on
male pipe ends, leaving the two end threads bare.
The heater and its manual shut-off valve must be
disconnected from the gas supply during any pressure
testing of that system at test pressures in excess of 1/2 psi (3.45 Kpa).
Dissipate test pressure in the gas supply line before reconnecting the
heater and its manual shut off valve to gas supply line. Failure to follow
this procedure may damage the gas valve. Over pressurized gas valves
are not covered by warranty. The heater and its gas connections shall be
leak tested before placing the appliance in operation.
Manual
Shut-off
Valve
Sediment Trap
Union
At least 9-in (23 cm)
At least 3-in (8 cm)
1-in (3 cm) Diameter
or larger
(See
Recommended Pipe
Sizes Chart)
18–24-in of 3/4-in
Gas line from
Valve
Bell
Reducer
Figure 17
Checking Gas Pressure Through Gas
Control Valve
Risk of explosion if a unit burning propane gas is
installed in a pit or other low spot. Propane is heavier
than air. Do not install the heater using propane in pits or other locations
where gas might collect. Consult your local building code officials to determine
installation requirements and specific installation restrictions of the heater
relative to propane storage tanks and filling equipment. Installation must meet
the requirements for the Standard for the Storage and Handling of Liquefied
Petroleum Gases, CAN/CSA B149.2 (latest edition) or ANSI/NFPA 58 (latest
edition). Consult local codes and fire protection authorities about specific
installation restrictions.
The UltraTemp ETi™ Hybrid Heater is 100% factory
tested, however Pentair recommends installations
be tested to ensure proper combustion and optimal
performance. During the initial startup, run the heater
continuously for at least 10 minutes and then insert a
probe connected to a combustion analyzer capable of
reading CO and either CO
2
or O
2
into the exhaust vent.
Wait for the reading to stabilize and confirm values are
consistent with ranges in Table 2. If combustion values are
outside of these ranges, contact technical support.
This appliance is equipped with an unconventional gas
control valve that is factory set with a manifold pressure of
–.2” (–0.5cm) wc. Installation or service must be performed
by a qualified installer, service agency, or the gas supplier.
If this control valve is replaced, it must be replaced with an
identical control.
The combination gas valve incorporates dual shut-off
valves and a negative-pressure regulator. For proper
operation, the regulated pressure at the outlet manifold of
the valve must be –0.2” (–0.5cm) wc below the reference
pressure at the blower mixer inlet, and the gas valve
‘VENT’ tap must be connected to the end cap air orifice as
shown in Figure 16.
Do not attempt to adjust the gas input by adjusting the
regulator setting. The correct gas regulator setting is
required to maintain proper combustion and must NOT be
altered.
Measured Gas High Low
CO 150 -
CO
2
9.2 7.8
O
2
7.2 4.8
Air-Free CO 199 -
Table 2
To Air Flow
Switch
To Gas
Valve Vent
Vent
Pressure Tap
To High Side
of Differential
Pressure Gauge
To Low Side of
Differential Pressure Gauge
Pressure Tap
Inlet
To Air Flow
Switch
To Gas
Valve Vent
Figure 16
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