Old-Biscuit wrote:
GlennLever wrote:
Old-Biscuit wrote:
GlennLever wrote:
Instructions says that when operating both if the gas fails to light the fault light will not light and the unit will continue operation on just electric.
The old unit had a separate wall switch to supply 110 electric to the heater. If I use the same wire the new unit will not receive 110 unless the wall switch is turned one (even if the units relay for 110 is tripped by the single switch).
Go back an re-read that statement.
It is talking about a 'dual switch' panel with one fault light.
If both 'switches are on and gas faults......then light will NOT come on until electric is turned off.
Should NOT wire electric directly and use your old on/off switch.
With the design change.......only ONE set of t-stat (DC set) that are wired thru circuit board.
Old design had 120V AC set of t-stats for electric and a 12V DC set of t-stats for gas. Worked independent of each other.
New design....one set for both...using DC thru circuit board.
Running 120V AC directly to element bypasses DC set of t-stats.
NO temp control that way. Element would be ON----heating without control or trip scheme.
I think you are misunderstanding me.
I will wire 110 to the new unit as it was intended (allowing the 12 volt signal from the water heater control board to the relay to turn current 110 on / off to the heating element).
The original 110 wall switch was used to power the old water heater can than be used to interrupt the 110 even when the 12 relay on the back of the new water heater is on, this will allow the water heater to run on just propane.
The only option I will not have will be to run on just electric.
I will install the water heater so that I can install this option at a later date.
That should work.
You will have the electric DC circuit 'hot' anytime you turn gas Switch On.......might want to make a notation in outside compartment to that affect
Boy I'm glad we worked thru that :B :B :B
Just test fired the water heater on propane, it fired up.
I shut it right back off.
Now just need to hook up the water lines.
Seal the unit to the motor home.
And fire it up for real and see if it heats water and shuts off.
