Honeywell T87F Series, Product Data, Page: 6 / 8

T87F THERMOSTATS
60-2222—3 6
Fig. 8. T87F in typical oil heating system.
Fig. 9. T87F in typical gas heating system.
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:
R114A,B R125 R117 R187A1,A4
R116 R126 R178 R190B1,B8
R117 R161 R180
— 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.
Fig. 11. T87F (replacing a series 10 thermostat) connected
to a 2- or 3-wire low limit control.
L2
COMBINATION FAN
AND LIMIT CONTROL
FAN
MOTOR
BURNER
MOTOR
THERMOSTAT
Y
R
W
CAD CELL
1
2
3
R8184G
WHITE
ORANGE
BLACK
IGNITION
OIL VALVE
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
R8184 PROTECTORELAY OIL PRIMARY CONTAINS
INTERNAL TRANSFORMER
CONNECT OIL VALVE, IF APPLICABLE.
2
1
T
F
M6105A
T
F
L1
(HOT)
3
R
W
1
L1
(HOT)
L2
FAN
MOTOR
COMBINATION FAN AND
LIGHT CONTROLLER
LIMIT
FAN
TRANSFORMER
GAS VALVE
THERMOSTAT
TH
TH TR
TR
M6103
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
L1
(HOT)
L2
TRANSFORMER
THERMOSTAT
M6104A
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
R
Y
W
COOLING
CONTACTOR COIL
ISOLATING
RELAY
HEAT
POSITION
REMOTE
CHANGEOVER
SWITCH
OIL PRIMARY
COOL
POSITION
2-WIRE LOW LIMIT
OPERATING CONTROL
JUMPER
MAY BE
REQUIRED
T87F
SERIES 10
RELAY OR VALVE
3-WIRE LOW-LIMIT OPERATING
CONTROL MAY BE RETAINED
ONLY IF R-B JUMPER IS NOT
REQUIRED ON RELAY OR VALVE
M20777
Y
R
W
R
R
B
B
W
W
W
B
R