Honeywell LP907A Installation Instructions Manual
LP907A
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1-1/16 (27)
7/8 (22)
5/8
(16)
3/8 NPT
NUT
SPACERS (2)
DUCT WALL
18-3/4 (476)
3-7/16
(87)
1/8 NPT
2
(51)
2-1/4 (57)
1/2
(13)
HONEYWELL
11/32
(9)
3/4 DIAM. HOLE
(MINIMUM)
REQUIRED
FOR MOUNTING
M7996A
)
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yrig
95- 1612EF
Airstream Insertion Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The LP907 Airstream Insertion Thermostat is a direct-acting,
le-pipe, bleed-type controller with a rigid element. The
sin
LP907B
with lockout capabilit
for lockout durin
replacin
Switchin
no longer available) was the same as the LP907A
. It included a pneumatic switching rela
summer (cooling) operation. When
the LP907B, use an LP907A and an RP670A
Relay.
SPECIFICATIONS
Model:
Dimensions:
Temperature Ratings:
Operatin
Storage (Maximum Safe): 150°F (66°C).
Throttlin
Setpoint Ran
Setpoint Adjustment:
Element:
Direct-acting, bleed-type controller.
See Fi
. 1.
Range: 40°F to 140°F (4°C to 60°C).
Range (adjustable internally): 10 to 70°F (6 to 39K).
: 40°F to 140°F (4°C to 60°C);
Dial Front: 40°F to 90°F (4°C to 32°C),
Dial Back: 90°F to 140°F
32°C to 60°C).
Dial under cover.
18-3/4 in. (476 mm) long x 3/8 in. (10 mm) diameter
invar rod and seamless brass tube.
When mountin
with an immersion well, use 107408 Heat
Conductive Compound in the well to improve response.
NOTE: For further information concernin
wells, see Form
68-0040 Immersion Wells and Compression Fittin
for Temperature Controllers.
Fig. 1. Dimensions of LP907A in in. (mm).
s
Maximum Safe Air Pressure:
Air Connections:
Mounting:
Push-on barb for 1/4 in.
Insertion with locknut on insertion couplin
20 psi
138 kPa).
6 mm) poly tubing.
Accessories:
14002913-002 External Restriction
301572A00767 Calibration Ad
309387 Filter Assembl
CCT2085 Gage Adapter.
BEFORE INSTALLING
Use with a 0.007-inch (0.17 mm) diameter restriction such as
the 14002913-002 Filter/Restriction Cartrid
restriction in the MP516B and C Damper Operators.
® U.S. Registered Trademark
Cop
ht © 2001 Honeywell • All Rights Reserved
.
0.007 in. (0.2 mm)].
ustment Key.
e or the integral
INSTALLATION
.
The LP907A can be mounted in any position. See Fig. 2
through 4 for mounting configurations.
OPERATION
Due to its bleed-type construction and wide throttling range,
the LP907A provides submaster-type operation (most often
low-limit control
h 7 for typical hookups.
throu
in a normal unit ventilator system. See Fig. 5
LP907A AIRSTREAM INSERTION THERMOSTAT
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DUCT
LP907
3/8 NPT
3/8
WASTE NUT
SHEET METAL
MTG. SCREWS (2)
M17676
1-11/16
(43)
Fig. 2. Mounting on standard sheet metal duct.
3/8 NPT COUPLING
3/8 NPT
LP907
DUCT
3/8 CLOSE
NIPPLE
3/8
WASTE NUT
SHEET METAL
MTG. SCREWS (2)
INSULATION
1-11/16
(43)
HEX COLLAR
LP907
3/8 NPT
1-3/16 (29)
1/2 NPT
IMMERSION
WELL
19-1/16 (484)
CONDUCTIVE
COMPOUND
ELEMENT
Fig. 4. Mounting in boiler wall with immersion well.
MAINTENANCE
IMPORTANT
• Mechanical devices require periodic service to
provide continued satisfactory performance. Controls
are no exception.
• How accurate and how trouble free your control
system remains in years to come depends largely on
the maintenance given to it.
• For best results, service all devices in your system at
one time.
• Time and trouble can be saved by arranging with
Honeywell for a maintenance agreement which will
guarantee expert, economical care, and insure
maximum life and efficiency from your system.
M17678
1/2
(13)
M17679
Fig. 3. Mounting on insulated duct.
When discharge air temperatures are within the throttlin
range, the LP907A control point is reset based upon room
thermostat branch-line pressure
the LP907A to directl
control airstream temperature except
BLP) changes. This allows
during morning warm-up and heavy-load conditions.
NOTE: Usin
a damper operator other than an MP516B
requires a 0.007 in. restriction upstream. The
restriction allows the LP907A to bleed fast enou
h to
control BLP.
. 6, the RP670 switching relay is connected directly to
In Fi
the main. The rela
action
locks out
the LP907A during the
summer (cooling) cycle when main pressure is 14 psi
97 kPa) or less. (Normal pressure ranges from 13 to 18 psi
[90 to 124 kPa]
95-1612EF 2
. This allows 1 psi
7 kPa) main line variation.
Equipment Required
•
3/16-in. open end wrench.
• Commercial cleanin
• Lubricant
part no. 310879).
• Calibration Ad
solvent.
ustment Ke
part no. 301572A00767).
Inspection, Cleaning and Lu bri cati on
1.
Visuall
2.
Remove dirt and corrosion from the element and bod
3.
Check air lines for dama
4.
Remove the cover and inspect internal parts.
5.
Remove dirt and corrosion with soft brush or commercial cleanin
inspect the device exterior.
e and leaks.
solvent.
CAUTION
Equipment Damage Hazard.
Can damage the device beyond repair.
Use lubricant sparin
nozzle (see Fig. 8).
6.
Lubricate pivot points and ad
and keep it away from the air
ustment threads.
.
LP907A AIRSTREAM INSERTION THERMOSTAT
M
M5450
LP907A
VP514
14002913-002
0.007 IN. RESTRICTION
(NOT FURNISHED)
)
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ROOM
THERMOSTAT
M
M
LP907A
B
VP512A
VALVE
H L
MP516A
OPERATOR
Fig. 5. Typical operation.
D.A.
H
RP418 E-P
RELAY
WIRE IN PARALLEL
WITH FAN MOTOR
FAN
R.A.
C
Fig. 7. Typical operation of duct mounted LP907A.
Operational Check
LP907A
1.
Ensure BLP ahead of the restriction (or MP516B
equals mainline pressure. If it does not:
ust the room thermostat in order to obtain equal
O.A.
M5419B
a. Ad
pressure.
b. Decrease the air temperature at the device sensin
element or increase the setpoint.
RESULT:BLP to the valve should decrease, and
vice versa.
Return setpoint to the ori
c.
inal setting.
TP972
M
B
M
WINTER
18 psi (1.24 BAR)
SUMMER
13 psi (.90 BAR)
MP516A
Fig. 6. Typical operation of LP907A in heating-cooling
application (unit ventilator).
RP670
MP516A
LP907A
FACE AND BY-PASS
RP418 E-P
RELAY
H L
WIRE IN PARALLEL
WITH FAN MOTOR
R.A.
D.A.
FAN
O.A.
M5448B
LP907B, or LP907A with RP670A Switching Relay
1.
Supply 13 psi (90 kPa) main air pressure to the LP907B
, or 18 psi (124 kPa) main air pressure to the
rela
RP670A, to simulate summer operation.
2.
Block BLP to the LP907 to ensure temperature chan
at the sensin
element do not affect room thermostat
control of system operation.
3.
BLP to the valve should settle to e
NOTE: The restriction can cause a sli
pressure settlin
4.
5.
18 psi (124 kPa) main air pressure to the relay.
Suppl
Perform the LP907A operational check.
.
ual thermostat BLP.
ht delay in
Calibration Check
When BLP equals 8 ± 1 psi (55 ± 7 kPa) with the air
temperature at setpoint, the controller is properly calibrated.
es
3 95-1612EF
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