COMBAT
®
CTU U
NIT
H
EATERS
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
24
SECTION 11: COMMISSIONING
Installation, service, commissioning and annual
inspection of the heater must be done by a
contractor qualified in the installation and service of
gas-fired heating equipment. Read this manual
carefully before installation, commissioning,
operation, or service of this equipment. All
components are accessed via the hinged door
secured by a ¼ turn latch. Opening the door
exposes live electrical connections and hot
components.
WARNING
E
lectrical
S
hoc
k
H
a
z
ard
U
se
e
x
treme
caution
while
commissioning.
Failure
to
follow
these
instructions
can
result
in
death
or
electrical
shoc
k
.
11.1 Pre-Commission Checks
All pre-commission checks must be carried out
before lighting the heater.
Ensure that the heater and all controls are suitable
for the gas, pressure and electrical supply to which
they are to be connected.
11.1.1 Louvres
Where fitted, the air delivery louvres need to be set
during commissioning to give the required air
distribution.
WARNING
Cut
H
a
z
ard
T
urn
off
gas
and
electrical
supply
b
efore
maintenance.
Fan
can
start
automatically
at
any
time.
Failure
to
follow
these
instructions
can
result
in
se
v
ere
injury
or
product
damage.
11.1.2 Electrical Checks
All pre-commission checks must be carried out
before commissioning the heater.
1. Check that all site wiring is connected in
accordance with the appropriate wiring dia-
grams
on Page 16, Section 10.3
through Page
23, Section 10.10
.
2. Check the correct fuse size is fitted;
See Page 15, Section 10.1
.
11.2 Gas Supply
All aspects of the gas installation including the gas
meter must be inspected, tested for soundness and
purged in accordance with local and national codes.
Ensure that the air is fully purged from the heater
inlet pipe up to the main gas valve inlet test nipple.
11.3 Mechanical Checks
1. Check that the fan(s) are free to run and
delivery louvres are turned to give required air
deflection.
2. Check that the flue (and air intake for room
sealed) is installed in accordance with these
instructions and local regulations.
3. The thermostat limit thermodisc is preset and
sealed at the factory and is not adjustable.
11.4 Begin Commissioning
11.4.1 Before Operating the Heater
To ensure that all the controls are in safe working
order, operate the heater for the first time with the
isolating gas valve turned off.
1. Turn off the gas isolating valve
2. Using the installed external control, turn on the
burner. The automatic sequence will now begin
as described
on Page 25, Figure 10
.
There will be no ignition of the burner and lockout
will occur, which proves the controls are operating
correctly.
