Honeywell T87F Series Product Data page 6

T87F THERMOSTATS
COMBINATION FAN
AND LIMIT CONTROL
L1
(HOT)
1
L2
BURNER
MOTOR
THERMOSTAT
Y
R8184G
T
R
2
W
T
F
F
CAD CELL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
R8184 PROTECTORELAY OIL PRIMARY CONTAINS
2
INTERNAL TRANSFORMER
3 CONNECT OIL VALVE, IF APPLICABLE.
Fig. 8. T87F in typical oil heating system.
THERMOSTAT
R
W
GAS VALVE
TRANSFORMER
TH TR
TH TR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 9. T87F in typical gas heating system.
60-2222—3
FAN
MOTOR
3
OIL VALVE
IGNITION
WHITE
ORANGE
BLACK
M6105A
COMBINATION FAN AND
LIGHT CONTROLLER
FAN
LIMIT
L1
(HOT)
L2
FAN
MOTOR
M6103
THERMOSTAT
R Y
W
ISOLATING
RELAY
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 10. T87F in heating-cooling application with remote
mounted system changeover switch. (Use Q539 Subbase
for switching at thermostat location.)
To Replace a Series 10 Thermostat
To adapt the T87F to a series 10 three-wire heating system:
1. Connect the wires from the thermostat (R and W) to the
terminals on the three-wire primary (B and W). See Fig.
11 and 12.
NOTES:
— Some three-wire controls manufactured by other
companies cannot be satisfactorily operated by a
two-wire thermostat.
— Before connecting the T87F to a three-wire con-
trol, consult the manufacturer.
— Some Honeywell series 10 relays require an R-B
jumper (see Fig. 11). These relays are:
1
— Relays or valves that do not require a jumper may
retain a three-wire, low limit control as shown in
Fig. 11. If the jumper is required, a two-wire con-
trol must be used.
— A three-wire, open contact, high-limit control
requires a jumper as shown in Fig. 12.
2-WIRE LOW LIMIT
OPERATING CONTROL
T87F
Y
R
W
Fig. 11. T87F (replacing a series 10 thermostat) connected
to a 2- or 3-wire low limit control.
6
TRANSFORMER
COOL
POSITION
COOLING
CONTACTOR COIL
HEAT
POSITION
OIL PRIMARY
R114A,B R125 R117
R116 R126 R178
R117 R161 R180
R
B
W
SERIES 10
RELAY OR VALVE
R B W
3-WIRE LOW-LIMIT OPERATING
CONTROL MAY BE RETAINED
R B W
ONLY IF R-B JUMPER IS NOT
REQUIRED ON RELAY OR VALVE
1
L1
(HOT)
L2
REMOTE
CHANGEOVER
SWITCH
M6104A
R187A1,A4
R190B1,B8
JUMPER
MAY BE
REQUIRED
M20777