15. Thermostat and Connections (cont’d)
FIGURE 12 - Thermostat |
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| SINGLE STAGE HEATING | ||
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| CL2 | G |
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Connections for Model |
| #1) | G | PR | |
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LDAP 1200 with Option | SUBBASE6 NOTE |
| W1 |
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CL1, CL2, CL3, CL7, or | W |
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CL18 | W.R. |
| R |
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| (OPTCL2) | (SEE | R |
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| R |
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| W2 |
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| CL1 |
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| ORTHERMOSTATT874FCL3)(OPT | CL3 | C |
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| W |
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| Y1 |
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| R |
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| Y2 |
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| TERMINAL STRIP |
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| UNIT #1 |
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| G | PR |
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| W1 |
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LDAP 1200 THERMOSTAT WIRING |
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| R | R | |
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FIELD WIRING |
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| W2 |
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FACTORY WIRING |
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CRIMP TERMINAL |
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| C |
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NOTES: |
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| Y1 |
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1) Set the anticipator at 0.6 amps. |
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2) For 400,000 BTUH low fire, do |
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| Y2 |
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not install this jumper. |
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3) For 800,000 BTUH low fire, do |
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| TERMINAL STRIP |
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not install this jumper. |
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| UNIT #2 |
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4) Set thermostat first stage anticipator |
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| G | PR | |
at 0.6 amps and and second stage |
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anticipator at 0.2 amps. |
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5) Jumper thermostat terminals RH |
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| W1 |
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to RC. |
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6) Jumper thermostat terminals RH |
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| R | R |
to RC and G to W1. |
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7) Set thermostat first stage anticipator at |
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maximum amps and second stage |
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| W2 |
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anticipator at 0.6 amps. |
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LDAP 1200 - Thermostat Option CL1, |
| C |
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CL2, CL3, CL7 or CL18 |
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WD# 189506 REV. #2 |
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| Y1 |
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| Y2 |
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| TERMINAL STRIPUNIT #3 |
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SINGLE STAGE HEATING
WITH RECIRCULATION
| #7) | CL18 G | |
| & | W1 |
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THERMOSTATT874FCL18)(OPT | NOTES(SEE |
| PR |
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| #6 | G |
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| SUBBASEQ674C |
| W1 |
| W2 |
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| R |
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| RH |
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| R |
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| RC | W2 |
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| #7) | CL7 |
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| W1 | C | |
THERMOSTAT | NOTE |
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| Y1 | ||
T874F | SUBBASE | W2 |
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Q674G |
| Y2 | |
(OPTCL7) | (SEE | R | |
TERMINAL STRIP
UNIT #1
G 
PR
W1
R R
W2
C
Y1
Y2
TERMINAL STRIP
UNIT #2
G PR
W1
R R
W2
C
Y1 
Y2
TERMINAL STRIP UNIT #3
TWO STAGE HEATING
| #5) | CL18 | G |
| G | ||
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| AND |
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THERMOSTAT | W1 | W1 | |
SUBBASE |
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CL18)(OPTT874F | #4 |
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NOTE |
| R | |
| Q674C | RH |
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| R |
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| RC |
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| (SEE | W2 | W2 |
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T874FCL7)(OPTTHERMOSTAT SUBBASEQ674G NOTE(SEE#4) | CL7 | C |
W1 |
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| Y1 | |
R |
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| Y2 |
| W2 |
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TERMINAL STRIP
UNIT #1
G PR
W1
R R
W2
C
Y1
Y2 
TERMINAL STRIP
UNIT #2
G PR
W1
R R
W2
C
Y1
Y2
TERMINAL STRIP UNIT #3
NOTE 2
NOTE 3
Multiple Heater
Control - Option
CL31 and Option
CL32
If the heater was ordered with a multiple heater control option, one thermostat can be used to control multiple heaters. The option will control a maximum of six Size 400 heaters, a maximum of three Size 800 heaters, or a maximum of two Size 1200 heaters.
The option includes a 40 VA transformer that replaces the standard transformer in the ”master” heater and a relay assembly that attaches to the “slave” heater. Option CL31 provides for control of two heaters. If control of additional heaters is desired, Option CL32 which is the relay assembly only must be added to each of the “slave” heaters.
The option packages are shipped separately and include complete instructions for installa- tion and wiring.
Form
