Maintenance; General; Cleaning - Honeywell B Service Data

TP979A-E
The TP979 thermostats provide independent control of
heating and cooling with dual thermostats and separate
setpoints and branch lines. This enables ZEB operation
without selected actuator springs or ratio relays (Fig. 12).
DA
HEATING VALVE
PNEUMATIC
OPERATOR WITH
4 TO 11 PSI
(28 to 76 kPa)
N.O.
SPRING RANGE
VALVE OPEN
VALVE CLOSED
64F 66F 68F 70F
18C 20C
HEATING
SETPOINT
Fig. 12. TP979 Typical Operation.
The TP979D and E models provide automatic night setback
of setpoint for heating and setup for cooling. Figure 13 shows
potential energy savings with night setback operation.
NIGHT SETBACK
ENERGY SAVINGS
60F 62F 64F
16C 18C
6 DEGREES F
(3.3 DEGREES C)
NIGHT SETBACK
NIGHT
HEATING
SETPOINT
Fig. 13. Night Setback Operation, TP979.
Covers
Both metal and plastic covers are available offering a wide
selection of windows. See Tables 11 and 12 in the
ACCESSORIES section for more information.
TP979C
RA
H C
COOLING VALVE
PNEUMATIC
OPERATOR WITH
4 TO 11 PSI
(28 to 76 kPa)
N.O.
SPRING RANGE
M
ZERO
ENERGY
BAND
72F 74F 76F 78F
22C 24C
COOLING
C3546
SETPOINT
VALVE OPEN
VALVE CLOSED
66F 68F 70F
20C 22C
DAY
COOLING
C3547
SETPOINT
TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

MAINTENANCE

General

See Figure 14 for tools necessary to calibrate TP970 and
TP9600 Series thermostats.
26C
15
10
5
0
GAGE
Fig. 14. TP970 and TP9600 Series Thermostat

Cleaning

Remove the thermostat cover and clean or dust the
thermostat using a soft brush or air hose. In extremely dirty or
dusty environments, clean the thermostats more frequently.
DO NOT use a high pressure air hose to remove dust. Use
only a soft brush to clean the throttling plate nozzle assembly.
No lubrication is necessary.
11
THERMOSTAT TOOL
TEST THERMOMETER
20
25
30
GAGE PORT NEEDLE
DIGITAL RELATIVE
HUMIDITY INDICATOR PEN
Calibration Tools.
120 140
100
160
80
180
60
200
40
220
20
0
C3929
75-7134—1