GIRARD TANKLESS WATER HEATER
TECHNICAL SUPPORT INFORMATION
FOR TECHNICIAN USE - NOT FOR END USER USE!
IF THE RESULTS IN THE OPERATION ARE NOT SATISFACTORY
The Girard Tankless Water Heater burner will automatically adjust from 27,000 BTU to 34,000
BTU depending on the incoming water temperature if the MODE Switch is set in the AUTO
position.
The Mode Switch is located inside the RV, it has two (2) positions; LOW and AUTO. LOW is
27,000 BTU and AUTO is either 27,000 BTU or 34,000 BTU. If in AUTO Mode, the sensor will
determine
automatically
whether to be on LOW 27,000 BTU or HIGH 34,000 BTU. The High/Low
sensor is located inside the Water Heater compartment. It is a bimetal disc that looks like a
limit switch and it is attached to the incoming water line, between the flow switch and the
copper heat exchanger (back of compartment, lower left side). There may be a condition
where this High/Low switch may not shift FROM Low to High at the appropriate time and/or
temperature when on AUTO Mode. When this condition occurs the Water Heater may be in
“LOW Mode” than in “HIGH Mode” so the water does not heat properly. This complaint most
likely occurs either in the Spring or Fall seasons.
In order to determine if this is a problem, we recommend that the tech does a manometer test
on the Water Heater gas valve. The tap location is easily accessible from the outside in the
Water Heater compartment. It is located near the bottom on the face of the Control Housing
Panel (panel is on the left side). The gas valve is a dual BTU valve. When the Mode Switch is
set in LOW Mode (27,000 BTU) the WCI pressure reading should be 6-7 water column inches.
When the Mode Switch is set in AUTO Mode and the incoming water temperature is less than
65 degrees (F) the unit should be in HIGH Mode (34,000 BTU) and the WCI pressure should be
10
– 11 water column inches. If this is not at these pressures we recommend the HIGH/LOW
sensor be by-passed. The following procedure will make the MODE Switch High/Low rather
than Auto/Low. This is acceptable since the Water Heater was originally approved without the
AUTO Mode.
BY- PASSING THE HIGH/LOW SENSOR
OPEN THE WATER HEATER DOOR
LOOK TO THE BACK LEFT OF THE WATER HEATER
THE SENSOR IS LOCATED ON THE INCOMING WATER LINE, IT IS A BI-METAL
SWITCH/DISC THAT LOOKS LIKE A LIMIT SWITCH. IT HAS TWO (2) BLACK WIRES
ATTACHED TO IT WITH FEMALE SPADE TERMNALS.
DISCONNECT BOTH BLACK WIRES AND ATTACH TOGETHER. YOU CAN EITHER; USE
A DOUBLE MALE CONNECTOR, MAKE A DOUBLE MALE CONNECTOR WITH 2 MALE
CONNECTORS AND A WIRE CONNECTED BETWEEN THEM OR CHANGE ONE OF THE
FEMALE CONNECTORS TO A MALE CONNECTOR.
WE DO NOT RECOMMEND THE RETAIL CUSTOMER PERFORM THIS CHANGE.
ONCE THIS CHANGE IS COMPLETED THE INTERIOR MODE SWITCH “AUTO” SETTING IS
NOW
“HIGH MODE” AND IN LOW SETTING WILL STILL BE “LOW MODE”. NOTE - IN WARMER
CLIMATES/CONDITIONS IT MAY BE NECESSARY TO PUT MODE SWITCH IN “LOW” MODE.
