32
Heat-Timer Corp.
059040-00 C
MultIple ModulatIng boIlers
dIrect HeatIng pIpIng dIagraM
Outdoor
Sensor
System
Sensor
120VAC
Boiler 1
Boiler 2
Boiler 3
Boiler 4
Building Heating Loop
RS-485
EXTENSION
MODULE
A
B
C
D
1 2
RUN
PROGRAM
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
3 4 5 6 7 8 9 10 11 12
13
15
14
17
16
18
22
20
19
21
24
23
29
25
27
26
28
32
30 31
L N
-
+
+
T
T
O
O
mA
GND
VLT
SYS
A
B
C
D
PWR
CUR / VLT
A
-
+
+
mA
GND
VLT
-
+
+
mA
GND
VLT
-
+
+
mA
GND
VLT
+
mA
TEMP
OUTDOOR
O
O
TEMP
SYSTEM
CUR / VLT
B
CUR / VLT
C
CUR / VLT
D
PROVE
/DHW
SHUTDOWN
/SETBACK
FOR ALL CIRCUITS
120VAC, 6A RESISTIVE
OUTPUT RATINGS:
1A PILOT DUTY, 15A TOTAL
115VAC 60Hz , 30VA MAX
INPUT RATINGS:
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
CAUTION
: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
/TSTAT
SYSTEM
Mini-MOD-CNC
Condensing and Non-Condensing
OD=
25
oF
SYS=
145
oF
<<A>>
B
<C>
D
100%
52% ---
---
Condensing
Modulating
Condensing
Modulating
Non-Condensing
Sequencing
Non-Condensing
Sequencing
system:
The Mini-MOD controls 4 modulating boilers. The boilers are piped in Reverse Return on the primary loop. The System
output is controlling the System Pump.
Heat-Timer Corp. is aware that each installation is unique. Thus, Heat-Timer Corp. is not responsible for any installation
related to any electrical or plumbing diagram generated by Heat-Timer Corp.. The provided illustrations are to
demonstrate Heat-Timer Corp.’s control operating concept only.
