SECTION 15: S
EQUENCE
OF
O
PERATION
105 of 143
15.3 Ni
g
ht Setback Options
15.3.1 Ni
g
ht Setback with Occupied/Unoccupied
Switch
This option pro
v
ides man
u
al control of occ
u
pied and
u
nocc
u
pied cycles, operated
b
y an occ
u
pied/
u
nocc
u
pied s
w
itch. It incl
u
des a line
v
oltage room
thermostat (shipped loose) and an occ
u
pied/
u
nocc
u
pied s
w
itch (mo
u
nted on remote panel).
D
u
ring the
u
nocc
u
pied cycle, the air t
u
rno
v
er
u
nit
remains off
u
ntil the room thermostat calls for heat.
At that time, the air t
u
rno
v
er
u
nit goes to a standard
daytime seq
u
ence
u
ntil the thermostat is satisfied.
15.3.2 Ni
g
ht Setback with Electro-Mechanical
Time Clock
This option pro
v
ides a
u
tomatic control of occ
u
pied
and
u
nocc
u
pied cycles, operated
b
y an electro-
mechanical time clock. It incl
u
des a se
v
en-day
electro-mechanical time clock (shipped loose). The
time clock can
b
e set for different on and off times
any of the days d
u
ring the se
v
en-day period. D
u
ring
the
u
nocc
u
pied cycle, the air t
u
rno
v
er
u
nit remains
off
u
ntil the room thermostat calls for heat. At that
time, the air t
u
rno
v
er
u
nit goes to a standard daytime
seq
u
ence
u
ntil the thermostat is satisfied.
15.3.3 Ni
g
ht Setback with Electronic Time Clock
This option pro
v
ides a
u
tomatic control of occ
u
pied
and
u
nocc
u
pied cycles, operated
b
y an electronic
time clock. It incl
u
des a se
v
en-day electronic time
clock (mo
u
nted on the remote panel). The time clock
can
b
e set for different on and off times any of the
days d
u
ring the se
v
en-day period. D
u
ring the
u
nocc
u
pied cycle, the air t
u
rno
v
er
u
nit remains off
u
ntil the room thermostat calls for heat. At that time,
the air t
u
rno
v
er
u
nit goes to a standard daytime
seq
u
ence
u
ntil the thermostat is satisfied.
15.4 Other Control Options
15.4.1 Exhaust Fan Interlock
This option pro
v
ides an interlock
b
et
w
een an exha
u
st
fan and an air t
u
rno
v
er
u
nit. It incl
u
des a
b
reak in the
control circ
u
itry to
w
hich
w
iring from an a
u
xiliary set
of contacts on the starter of an exha
u
st fan can
b
e
connected.
15.4.2 Unit Mounted On/Off Switch
This option pro
v
ides man
u
al operation of the air
t
u
rno
v
er
u
nit. It incl
u
des a do
ub
le-pole, do
ub
le-thro
w
(DPDT) toggle s
w
itch (mo
u
nted in the air t
u
rno
v
er
u
nit's control panel).
15.4.3 Post-Pur
g
e Timer
This option allo
w
s the s
u
pply fan on the eq
u
ipment to
r
u
n for a timed period (adj
u
sta
b
le 1 to 100 min
u
tes)
after
bu
rner sh
u
tdo
w
n. It incl
u
des timer (mo
u
nted on
air t
u
rno
v
er
u
nit).
15.4.4 Pre-Pur
g
e Timer
This option allo
w
s the s
u
pply fan on the eq
u
ipment to
r
u
n for a timed period (adj
u
sta
b
le 0.1 to 15 min
u
tes)
b
efore allo
w
ing the
bu
rner to fire and r
u
n. It incl
u
des
timer (mo
u
nted on air t
u
rno
v
er
u
nit).
15.4.5 Audible Alarm for Flame Failure
This option so
u
nds an alarm
u
pon
bu
rner fail
u
re. It
incl
u
des an alarm
b
ell/horn (mo
u
nted on the air
t
u
rno
v
er
u
nit's control panel or remote panel).
15.4.6 Service Receptacle Powered by Others
This option pro
v
ides a ser
v
ice receptacle. It incl
u
des
gro
u
nd-fa
u
lt interr
u
pter (GFI) receptacle (mo
u
nted on
the air t
u
rno
v
er
u
nit). Po
w
er to the receptacle is
s
u
pplied
b
y the installer.
15.4.7 Service Receptacle with a 7 A Power
Source from Air Turnover Unit
This option pro
v
ides a ser
v
ice receptacle. It incl
u
des
gro
u
nd-fa
u
lt interr
u
pter (GFI) receptacle (mo
u
nted on
the air t
u
rno
v
er
u
nit). Po
w
er to the receptacle is
s
u
pplied
b
y a 7A po
w
er so
u
rce from the air t
u
rno
v
er
u
nit itself.
15.4.
8
UL-Listed Flame Control Panel
This option pro
v
ides for the air t
u
rno
v
er
u
nit's control
panel to
b
e
bu
ilt to Under
w
riters La
b
oratories (UL)
standards. It incl
u
des an UL la
b
el on the control
panel.
