Thelin Echo Direct Vent, Service Manual

Page: 5 / 66

THELIN HEARTH PRODUCTS
Gas Heater Service Manual 5
I. INTRODUCTION
Thelin Hearth Products manufactures three
models of free-standing gas heaters: the Parlour
Direct Vent, Gnome Direct Vent, and Echo
Direct Vent. This manual will give you the
information you need to install them correctly,
troubleshoot problems, and fine-tune them after
they are installed. In addition, in Section X you
will find a step-by-step guide to converting the
LP stoves to natural gas and vice-versa.
To properly perform maintenance and work on
all models, you will need the following tools:
1/4-, 3/8-, or 1/2-inch socket set
Slot and phillips screw drivers (a Makita or
similar cordless drill works well)
Digital read-out volt meter
Allen wrench set
T-30 Torx tip
Wire stripper, crimp connectors, and crimp
tool
Drop light or flashlight with extension cord
Crescent wrench and set of end wrenches
Instrument for checking gas pressure, i.e.,
manometer
II. VENTING
Figure 1 through Figure 10 will give you the
recommended venting systems for all Thelin
Hearth Products gas heaters. Venting properly is
extremely important. Ninety percent of
problems with Direct Vent stoves relate to
improper venting. If you deviate from these
installation diagrams, you must remember the
following:
1. All horizontal runs must maintain a 1/2-inch
per foot rise. Horizontal funs over 4 feet are
highly discouraged.
2. Each added 90- or 45-degree bend creates
static pressure and will affect the
performance of the heater. Two 45-degree
elbows are always better than one 90-degree
elbow.
3. Long vertical runs (over 8 feet) on the Direct
Vent models can create turbulence problems
with the incoming combustion air and these
installations may require adjustment of the
Restrictor disks (see Section VII). If the
pilot flame pulls away from the
thermocouple, a drop out will occur and the
burner will go out. This symptom can be
created by too much incoming combustion
air.
4. It is extremely important that all interlocking
connections are locked properly and
securely. Failure to lock sections together
correctly will result in a mixture of
combustion air and exhaust gases, and the
fire will lift off of the burner and go out.