LP907A AIRSTREAM INSERTION THERMOSTAT
Fig. 2. Mounting on standard sheet metal duct.
M17676
3/8
WASTE NUT
DUCT
3/8 NPT
SHEET METAL
MTG. SCREWS (2)
1-11/16
(43)
LP907
IMPORTANT
•
M17679
3/8
WASTE NUT
DUCT
3/8 CLOSE
NIPPLE
3/8 NPT COUPLING
3/8 NPT
SHEET METAL
MTG. SCREWS (2)
INSULATION
1-11/16
(43)
LP907
Fig. 3. Mounting on insulated duct.
When discharge air temperatures are within the throttling
range, the LP907A control point is reset based upon room
thermostat branch-line pressure (BLP) changes. This allows
the LP907A to directly control airstream temperature except
during morning warm-up and heavy-load conditions.
NOTE: Using a damper operator other than an MP516B
requires a 0.007 in. restriction upstream. The
restriction allows the LP907A to bleed fast enough to
control BLP.
In Fig. 6, the RP670 switching relay is connected directly to
the main. The relay action locks out the LP907A during the
summer (cooling) cycle when main pressure is 14 psig
(97 kPa) or less. (Normal pressure ranges from 13 to 18 psig
[90 to 124 kPa]). This allows 1 psig (7 kPa) main line variation.
Fig. 4. Mounting in boiler wall with immersion well.
MAINTENANCE
M17678
LP907
19-1/16 (484)
1/2 NPT
IMMERSION
WELL
ELEMENT
3/8 NPT
1/2
(13)
HEX COLLAR
CONDUCTIVE
COMPOUND
1-3/16 (29)
• 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.
Equipment Required
3/16-in. open end wrench.
• Commercial cleaning solvent.
• Lubricant (part no. 310879).
• Calibration Adjustment Key (part no. 301572A00767).
Inspection, Cleaning and Lubrication
1. Visually inspect the device exterior.
2. Remove dirt and corrosion from the element and body.
3. Check air lines for damage and leaks.
4. Remove the cover and inspect internal parts.
5. Remove dirt and corrosion with soft brush or commer
cial cleaning solvent.
CAUTION
Equipment Damage Hazard.
Can damage the device beyond repair.
Use lubricant sparingly and keep it away from the air
nozzle (see Fig. 8).
6. Lubricate pivot points and adjustment threads.
95-1612EF
2
