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Datsun 1200, unlike the Datsun 1000, was designed with air conditioning in mind. However, it was still a dealer-installed add-on option and so varied by country and region. In April 1978 it became a factory option for Japanese market Sunny Truck.

Parts Needed

Buy Universal Air Conditioning kits - $500 on eBay. $1300 from Summit. Contain compressor and everything needed except engine mounting brackets and V-belt.

Album 23101

Pump (Compressor) & mounting bracket
Double crankshaft pulley & V-belt
Condensor (radiator-like unit)
Filter dryer/receiver
Evaporator (under-dash unit)
Hoses
Wiring

double-belt Crankshaft Pulley
Album 20080

Since B110 A/C is fairly rare, you can source most of the parts from a B210 or B310. Only the interior vent setup is needed specific to the 1200.

Album 13934

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Installation

Install all the parts, except leave the dryer/receiver plug and unplumbed
Drive to the aircon service shop
They will evacuate the system (vacuum pump), charge with R-134a and appropriate oil

Compressor

The compressor pump bolts to the engine and is driven by a v-belt. A double-groove Crankshaft Pulley is fitted.

Early (to 1979): York-type compressor uses aluminum case. Commonly used from 1958-1980, they last a long time and are generally interchangeable between different car makes. When replacing, unbolt your clutch unit and bolt it to the new compressor.
Late (from 1980): Compact swash-type (radial) compressor

York-type | Radial
Album click to view Album 21308

27630-G1660 COMPRESSOR-COOLER DKKC
27630-W7002 COMPRESSOR-COOLER DKKC [B421]
* JDM Datsun B120 8110-8910
* JDM Datsun 720 L18 7909-8105
92610-G1900 COMPRESSOR-COOLER DKKC [B421]
* B120 8910-
11910-G1661 BRACKET-COMPRESSOR 7804-7907
* 11911-G1661 BRACKET-COMPRESSOR [2nd piece]
11929-H1000 BELT-COMPRESSOR L-810 7804-7807 
11910-G1615 BRACKET-COMPRESSOR 7908-8910
11910-95W00 BRACKET-COMPRESSOR 8910-
11929-G1615 BELT-COMPRESSOR L-814 7808-
11925-A0100 PULLEY ASSY-IDLER,COMPRESSOR 7804-7807
11925-G1615 PULLEY ASSY-IDLER,COMPRESSOR 7808-
11917-M0100 BOLT-ADJUST 7804-7907
* 11933-A0100 NUT 7804-7907

Engine Brackets

Various types of brackets were used over the years to fix the compressor to the engine. Early A12 and late A12 brackets differ.

See Main Article: Compressor brackets

You can make your own brackets, buy used from a B110/B210/B310 or Cherry/Pulsar, or buy new.

Evaporator

RHD factory Nissan
Album 15193

Seen in USA
Album 15372

LHD kit by Vintage Air 672001-VHY $309 at Summit

Australia aftermarket
Album 5060

Left-hand Drive

Ecuador

Album 20065

Taiwan

USA

1972 Brochure
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The air condition for Datsun cars is made by Frigiking. It's the only system approved by the Datsun factory.

Except that the Factory used a different brand. Frigiking was only used in USA.

USA Type 1

Album 15622

Album 16243 Album 16244 Album 14556 Album 14557\

Specifications

Frigiking dealer-installed package. Larger capacity than 240Z, but less than 510 or 521 pickup
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PERFORMANCE
Capacity: 12,500 BTU/hour
Airflow: 180 CFM
Evaporator Coil: 3/8 x .016 cu tubes, 4 rows
 staggered pattern, 12" x 5" x 2-1/2"
 fin series 120 flat aluminum
Expansion Valve: 1-1/2 ton

ELECTRICAL
Fan Switch: Reostat
Thermostat: Ranco type A-30
 Cold cut-out: 28°F ±2°
 Cold cut-in: 36°F ±2°
 Warm cut-out: 58°F ±4°
Fan Motor: Double shaft, single speed, 4600 RPM @ 13.5 V
 11.5 amps maximum current draw
Clutch: Pitts 6" double groove 12V 4.0 amp
Wiring: SAE specification J558a
Overload Protection: Inline fuse 30 amps

COMPRESSOR: York 206 (6 cubic inches)

CONDENSOR: 3/8 x .016 cu. tube, 2 row inline pattern
 13 x 12 x 1-1/2 fin seris 10 fins/inch

GENERAL KIT COMPONENTS: All meet SAE specifications

COMPRESSOR MOUNT KIT
Brackets are 1/4" hot rolled steel, arc welded and painted
Drive Pulley material: ASTMA-159, Class G3000, grey cast iron
 precision machined, balanced and painted
Idler Pulley: Cast iron, fully machined with single-row sealed ball bearing
Attaching Hardware: Grade 5, black, rust resistant
Compressor Drive Belt: Standard automotive quality, 500 section

EVAPORATOR SECTION
Material: High-strength injection-molded plastic case
Knobs: injection-molded plastic

USA Type 2

USA Type Frigette

Frigette Brand. Aftermarket kits still sold at JC Whitney!

Album 2187

Optional Fan

Nissan option flex-fan (dealer item)
Album 3053

USA catalog
* 21060-H1001 FAN-COOLING A12 (standard B110 fan)
* 21060-A4605, 21060-N0100 FAN-COOLING D=330 FOR TROPICAL USA
  330 mm diameter

Sunny Truck Kit

Starting 1978 April a factory cooler kit was offered with upright compressor and standard interior unit. It is a very nicely designed unit, however the interior cooler protrudes into the passenger legroom and precludes using a package tray.

See Main Article: 1979 aircon

Album 20078
This kit is beautiful and easy to install. Unfortunately the interior cooler unit is bulky and protrudes farther into the passenger legroom than other types.

Album 20087

Retail Kit

Acqua Garage sells a R-134a kit, 2015 price was 300000 Yen (about $3000 USD).

1 hanging unit Unicla IMPERIAL III with 5/16 - 5/8 O-ring
2 AC compressor UP-90 = U02/A / A charging valves (no)
3 12 x 12 Condensor plust reducer joints
4 receivers & receiver BK
5 electric fan unicla 8 inch PUSH & banding
6 General purpose relay 2 pc
7 a. Special design compressor fixing bracket.
8 AC for stock taking crank pulley
9 cooling fan & spacers
10 hose

Unicla hanging unit 12V R134a right hand drive AG ALL-BLACK specifications (genuine Unicla, not a "Star Road" made in China knockoff)

O-rings made in Japan products composition 5/16-5/8 UNIF wiring fuse + universal mounting bracket included

AG special compressor UP 90 + U02 < gas valve protection > 12 V R134a O-rings
A/A clutch parts w/< front thickness and > pressure valve with 1/2 - 5/8 UNIF

comes with compressor fixing bracket for the A-series block