B-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
98 of 147
17.
8
.2 Low Temperature Limit with Override Timer
This option is designed to t
u
rn the
u
nit off
w
hen air is
discharged belo
w
the temperat
u
re setpoint for a
period in excess of timer setpoint. The lo
w
temperat
u
re limit s
w
itch is located in the air handler’s
control enclos
u
re. The lo
w
temperat
u
re limit s
w
itch
has an adj
u
stable setting bet
w
een -20° F (-29° C)
and 100° F (38° C). The timer by-passes the lo
w
temperat
u
re limit s
w
itch for the first 5 min
u
tes to allo
w
the b
u
rner to establish a flame
w
hen the air handler
is t
u
rned on. If the air handler’s discharge
temperat
u
re falls to the predetermined lo
w
temperat
u
re limit setpoint, after the 5 min
u
te
establishing period, the air handler’s blo
w
er
w
ill be
t
u
rned off. To reset the lo
w
temperat
u
re limit s
w
itch,
set the fan s
w
itch to off and then on again. The air
handler
w
ill ret
u
rn to the normal seq
u
ence of
operations.
FIGURE 59: CO Sensor Interlock for FR and MUA
FIGURE 60: CO Sensor Interlock for AM and VAV
FIGURE 61: CO Sensor Interlock for AM and VAV
with Photohelic
FIGURE 62: CO Sensor Interlock for AM with
Buildin
g
Pressure
LOW LIMIT SWITCH
2
3A
LT
RED
YELLOW
3A
LT
3B
SET AT 5 MIN
SET AT 50° F (10° C)
LOW LIMIT TIMER
LOCATED AT DISCHARGE SIDE OF BLOWER
TO TEST: SET DIAL TO MIN TEMP
UNIT OPERATES
SET DIAL TO MAX TEMP
UNIT SHUTS DOWN
Part Number
Description
Models
01003
Lo
w
Temperat
u
re Limit
w
ith O
v
erride Timer
All Models
CR5
WIRED BY OTHERS
2
CR5
CR5
1
3A
7
7A
HI TEMP
LIMIT
HLS
MANUAL
RESET
8
Part Number
Description
Models
13205103
CO Interlock
All Models
PRESSURE
BUILDING
60
62
61
L
H
MODULATING
DAMPER MOTOR
SWITCH
CR6
CR6
CR5
WIRED BY OTHERS
2
CR5
CR5
1
3A
7
7A
CR6
SET TO
0.01" W.C.
HI TEMP
LIMIT
HLS
MANUAL
RESET
8
62A
Part Number
Description
Models
13205104
CO Interlock
All Models
2
CO2 SENSOR
60
62
1
MODULATING
DAMPER MOTOR
PHOTOHELIC
CR7
CR7
CR7
63
1
62A
Part Number
Description
Models
13205106
CO Sensor
2020 and 2030
2
CO2 SENSOR
PRESSURE
BUILDING
60
62
MODULATING
DAMPER MOTOR
SWITCH
CR7
CR7
63
1
RELAY CR7 CONNECTIONS ARE LOCATED BETWEEN THE
DAMPER MOTOR AND THE BUILDING PRESSURE SWITCH
L
H
1
62A
Part Number
Description
Models
13205106
CO Sensor
2020 and 2030
Summary of Contents for 2005
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