heater update (Was: Martin wall heater fan problem)

[Jo-Ski]

Dear folks,

An update, info on what looks to be a great replacement electric wall heater
some may be interested in, and a question about hooking up the thermostat. . .

First off, many belated thanks to all who responded about our problem with the
electric wall heater our '83 FC 35 RB (computer problems kept us offline for
some days)!

Per many of your suggestions, Stew tried taking the old one apart and cleaning
the fan, etc., but no go. Many thanks to John Finn for writing his detailed
solution to a similar problem, but Stew thought that route a little beyond his
expertise-level in working on the coach. Many thanks to Chuck Wheeler for the
tip on Grainger as a source for replacement wall heaters. We went with that.

From Grainger's Website, I found that Grainger apparently has local
dealers/distributorships all over the place (we found one right in little ol'
Bellingham, WA, not far from where we live). The Bellingham Grainger dealer told
us we could order the replacement heater through our local hardware store, which
proved fast and easy.

In our 83' FC 35 RB, the new heater fits perfectly into the space just above the
floor in the bathroom occupied by the old electric wall heater. Runs a lot
quieter than the old one, too. It's actually manufactured by Marley.

Details: Marley Model R1500T2 Fan Forced Wall Heater (about $220)
We had to purchase a remote thermostat that works with this heater separately
($7.00). The thermostat fits into the heater unit.

Thermostat Question

The thermostat has 2 red wires (labelled "L1" and Off") and 2 black
wires(labelled "L2" and "Cycle").

The pertinent steps in the hook-up instructions state: "4. Connect one red and
one black thermostat lead to power wiring per wiring diagram (Fig. 6) using
properly sized listed wirenuts (provided). 5. Fold wires back into wiring
compartment behind thermostat to clear fan deck."

I hope a diagram done in typographic characters shows up OK in your e-mail, but
here's what I think is the germane part of Fig. 6, which might explain our
confusion:

L1 | | L 2 or N
GND | |
ê | |
BLK|______| RED
| DOUBLE-POLE |
| BUILT-IN | R2
Series only
| THERMOSTAT |
| |
BLK | | RED
R Series only ------------------------------------------------------
| POWER SUPPLY
________________|
| REMOTE WALL |
| THERMOSTAT |


The diagram's a bit confusing, but Stew says his main confusion stems from the
fact that there are 4 wires (2 red, 2 black), and the above instructions say to
connect one red and one black. Also, he thinks the part of the diagram he needs
to follow is the one marked "R Series only" vs. the part marked "R2 Series only"
because the R2 looks like it pertains to a model with a built-in thermostat. (As
a technical writer, I find that instruction manuals covering multiple models
drive me crazy!)

Anyway, can anyone with more electrical experience explain how to hook it up or
explain a little of what's going on, please?

Many thanks in advance!

Jo-Ski (also for Stew)
83 FC 35 RB
"The Bird Abides"
Blaine, WA




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