Installation and Operation Manual
28 Rinnai Corporation ES38 Manual
Complete these instructions for altitudes greater than 2000 ft, 610 m.
For high altitude installations in Canada, the conversion shall be carried out by a manufacturer’s authorized
representative, in accordance with the requirements of the manufacturer, provincial or territorial authorities having
jurisdiction and in accordance with the requirements of CAN/CGA-B149.1 or CAN/CGA-B149 installation codes.
Adjust Gas Pressure Settings
1. Turn off the gas and the power supply.
2. Remove one test point screw (1/8 NPT tap) with 3/16
Allen wrench and attach the manometer to the test
port. Ensure that the manometer is properly
calibrated.
3. Turn on the gas and power supply to the appliance.
With the unit in the Off position, press the SW1 switch
at the top of PC board until it beeps.
4. Select the correct code for gas type and altitude on
the LED display using ▲ and ▼ buttons:
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is supplied to
the appliance. Parts of the PC board are supplied
with 120 volts AC.
CAUTION
Do not touch the areas at or near the exhaust. This
area becomes very hot and could cause burns.
CAUTION
Do not insert hands or objects into the circulation fans
while they are running. Injury or mechanical
malfunction may occur.
The regulator has been factory pre-set. If the
pressure is incorrect, check the supply pressure first,
before making any adjustments to the appliance.
Also, if the low control pressure cannot be obtained,
adjust the adjustment screw on the proportional valve
to roughly set pressure and then recheck both the low
and high fire pressures.
NOTICE
Natural Gas Propane Gas
Code
A1 A2 A3 A4 L1 L2 L3 L4
Altitude
0-2000 ft
0-610 m
2001-5200 ft
611-1585 m
5201-7700 ft
1586-2347 m
7701-10200 ft
2348-3109 m
0-2000 ft
0-610 m
2001-5200 ft
611-1585 m
5201-7700 ft
1586-2347 m
7701-10200 ft
2348-3109 m
Manifold test
pressure -
W.C. Low
1.97 in
(50
mm)
1.97 in
(50 mm)
1.97 in
(50 mm)
1.97 in
(50 mm)
4.29 in
(109 mm)
4.29 in
(109 mm)
4.29 in
(109 mm)
4.29 in
(109 mm)
Manifold test
pressure -
W.C. High
3.7 in
(94
mm)
3.3 in
(83 mm)
3.0 in
(76 mm)
2.8 in
(70 mm)
10.1 in
(257 mm)
9.1 in
(232 mm)
8.3 in
(212 mm)
7.6 in
(194 mm)