Honeywell MagicStat 28 Programming And Installation Instructions page 24

2-WIRE HEAT-ONLY (JUMPER INTACT)
A
B
HEATING
RELAY OR
VALVE COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
C
D
W Y G
Rc
R
JUMPER
L1
(HOT)
1
L2
M1709B
4-WIRE HEAT/COOL (JUMPER INTACT)
HEATING COOLING
RELAY OR CONTACTOR
VALVE COIL COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
22
A C
B D
W Y G
Rc
R
JUMPER
FAN
RELAY
L1
(HOT)
L2
M1710B