UHD S
TANDARD
D
UCT
F
URNACE
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
32 of 57
SECTION 12: USER INSTRUCTIONS
The UHD[T][X][S][R] Series heaters are f
u
lly
a
u
tomatic and operate from the external controls
fitted on site.
12.1 Heater Operation
When the heater has been s
w
itched on by the
thermostat installed on site, the main b
u
rner
w
ill
a
u
tomatically t
u
rn on.
The b
u
rner control mod
u
le
w
ill control the safe
ignition of the flame.
For eq
u
ipment
w
ith t
w
o stage gas valve, the heater
may start in lo
w
or high fire.
All heaters req
u
ire a constant gas and electricity
s
u
pply
w
hich m
u
st not be interr
u
pted d
u
ring the
normal operation of this heater.
12.2 Li
g
htin
g
Instructions
12.2.1 To Turn On Heater
1. Ens
u
re that the electrical and gas s
u
pplies to
the heater are on. Check that the on site
controls are
"
ON
"
.
IMPORTANT:
The thermostat setting m
u
st be above
the ambient temperat
u
re for the heater to operate.
2. The a
u
tomatic firing seq
u
ence
w
ill begin as
described
on Page 29, Figure 14
. The heater
w
ill no
w
operate a
u
tomatically
u
nder the control
of the on site controls.
12.2.2 To Turn Heater Off
Set the thermostat to the
"
OFF
"
position or lo
w
est
setting.
The b
u
rner
w
ill t
u
rn off immediately.
To restart, t
u
rn the thermostat on or above room
temperat
u
re.
12.3 Simple Troubleshootin
g
Some possible reasons for the heater not operating
are:
1. Gas s
u
pply not
"
ON
"
.
2. Electricity s
u
pply not
"
ON
"
.
3. The time and/or temperat
u
re controls are not
"
ON
"
.
4. A limit s
w
itch may have operated. This may be
ca
u
sed by an interr
u
ption of the electrical
s
u
pply, fail
u
re of the distrib
u
tion fan or vent or
heat exchanger blockage.
If a temperat
u
re limit s
w
itch persistently trips, there
is a fa
u
lt
w
hich m
u
st be investigated by a contractor
q
u
alified in the installation and service of gas-fired
heating eq
u
ipment.
12.3.1 Simple Troubleshootin
g
(Burner Faults)
If the b
u
rner fails to ignite for any reason, it
w
ill retry
for ignition (fo
u
r trials total). After fo
u
r
u
ns
u
ccessf
u
l
ignition trials, the control
w
ill p
u
t the heater into
locko
u
t for one ho
u
r.
Locko
u
t sho
u
ld not occ
u
r d
u
ring normal operation of
the heater and indicates there is a fa
u
lt condition
w
hich m
u
st be corrected. There is an LED light on
the ignition control that flashes codes to assist in
fa
u
lt correction.
See Page 32, Figure 17
for LED
indication codes.
Fi
g
ure 17: LED Dia
g
nostic Codes
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.
LED INDICATION FAULT MODE
Slo
w
Flash
Normal Operation - No call for heat.
Fast Flash
Normal Operation - Call for heat.
2 Flashes
Ignition Locko
u
t - No flame detected.
3 Flashes
Airflo
w
Fa
u
lt - Press
u
re s
w
itch open or closed.
4 Flashes
Temperat
u
re Limit S
w
itch Open
5 Flashes
Flame Sense Error - Gas valve not energized.
Steady On
Internal Control Fail
u
re
Summary of Contents for Combat UHD-Series
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